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There is a sign flip in how [BFZIII], Remark 2.4 should be implemented
[clav.git] / ui-sdl.c
blob7b7c5e41aa94b72d0ff03245d1f6f36a1de59271
1 /*
2 * Copyright (c) 2018, S. Gilles <sgilles@math.umd.edu>
3 *
4 * Permission to use, copy, modify, and/or distribute this software
5 * for any purpose with or without fee is hereby granted, provided
6 * that the above copyright notice and this permission notice appear
7 * in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
10 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
11 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
12 * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
13 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
14 * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
15 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
16 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18 #include <errno.h>
19 #include <math.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23
24 #include <SDL.h>
25 #include <SDL_ttf.h>
26
27 #include "color-selection.h"
28 #include "file-selection.h"
29 #include "macros.h"
30 #include "quiver.h"
31 #include "ui-sdl-font.h"
32 #include "ui.h"
33
34 #define TICKS_PER_FRAME (1000 / 60)
35
36 #ifndef M_PI
37 #define M_PI (3.14159265358979323846)
38 #endif
39
40 /* What clicking does */
41 static enum ui_action {
42 UIA_NONE = 0,
43 UIA_ASK_QUIT,
44 UIA_DEC_FATNESS,
45 UIA_DELETE,
46 UIA_ENTER_LOAD,
47 UIA_ENTER_RENAME,
48 UIA_ENTER_SAVE,
49 UIA_ENTER_COLOR,
50 UIA_INC_FATNESS,
51 UIA_CHANGE_COLOR,
52 UIA_MUTATE,
53 UIA_NEW_EDGE_1,
54 UIA_NEW_EDGE_2,
55 UIA_NEW_H_EDGE_1,
56 UIA_NEW_H_EDGE_2,
57 UIA_NEW_VERTEX,
58 UIA_RENAME,
59 UIA_LEN
60 } ui_action;
61
62 /* Whether to cycle the state indefinitely (add many vertices, &c) */
63 static uint_fast8_t ui_action_loop;
64
65 /* The window we'll be using */
66 static SDL_Window *sdl_win;
67
68 /* The renderer we'll be using */
69 static SDL_Renderer *sdl_renderer;
70
71 /* How to limit the framerate */
72 static Uint32 frame_start_ticks;
73
74 /* Whether the scene needs to be drawn again */
75 static uint_fast8_t redraw;
76
77 /* Whether a vertex was just dragged (necessitating info redraw) */
78 static uint_fast8_t dragged_selected_vertex;
79
80 /* The informative texture */
81 static SDL_Texture *selected_info;
82
83 /* Buffer for event queue */
84 static struct ui_event *eq_buf;
85
86 /* Current max length of event queue */
87 static size_t eq_len;
88
89 /* Current head of queue */
90 static size_t eq_head;
91
92 /* Current tail of queue */
93 static size_t eq_tail;
94
95 /* The quiver we'll be using */
96 static struct quiver *q;
97
98 /* Width of drawing area in pixels */
99 static int da_pix_width;
100
101 /* Height of drawing area in pixels */
102 static int da_pix_height;
103
104 /* The background color */
105 static SDL_Color color_bg = { .r = 0xe2, .g = 0xe2, .b = 0xe2, .a = 0xff };
106
107 /* The normal vertex color */
108 static SDL_Color color_v = { .r = 0x82, .g = 0x82, .b = 0xb2, .a = 0xff };
109
110 /* The vertex color for preview vertices */
111 static SDL_Color color_v_preview = { .r = 0x82, .g = 0x82, .b = 0xb2, .a =
112 0x40 };
113
114 /* The normal vertex outline color */
115 static SDL_Color color_outline = { .r = 0x12, .g = 0x12, .b = 0x12, .a = 0x80 };
116
117 /* The vertex outline color for preview vertices */
118 static SDL_Color color_outline_preview = { .r = 0x12, .g = 0x12, .b = 0x12, .a =
119 0x20 };
120
121 /* The selected vertex outline color */
122 static SDL_Color color_outline_sel = { .r = 0x42, .g = 0x42, .b = 0xe2, .a =
123 0x80 };
124
125 /* The font color */
126 static SDL_Color color_font = { .r = 0x12, .g = 0x12, .b = 0x12, .a = 0x80 };
127
128 /* The normal edge color */
129 static SDL_Color color_e_normal = { .r = 0x12, .g = 0x12, .b = 0x12, .a =
130 0xff };
131
132 /* The half edge color */
133 static SDL_Color color_e_half = { .r = 0x12, .g = 0x12, .b = 0x12, .a = 0x60 };
134
135 /* The abnormal edge color */
136 static SDL_Color color_e_abnormal = { .r = 0xd0, .g = 0x12, .b = 0x12, .a =
137 0xf0 };
138
139 /* The selected edge color */
140 static SDL_Color color_e_sel = { .r = 0xb2, .g = 0xb2, .b = 0xe2, .a = 0x40 };
141
142 /* The font for node names, instructions, etc */
143 static TTF_Font *normal_font;
144
145 /* SDL wants a SDL_RWops pointer to deal with in-memory font */
146 static SDL_RWops *normal_font_rw;
147
148 /* The base font size */
149 static uint_fast8_t base_font_size = 12;
150
151 /* How much space (pixels) between lower left of screen and bottom text */
152 static unsigned int text_border_padding = 24;
153
154 /* Strings to display at bottom of screen */
155 static const char *bottom_string[] = {
156 /* */
157 [UIA_NONE] = "[m] Mutate\n[v] Create new vertex\n"
158 "[d] Delete vertex/edge\n[e] Add edge\n"
159 "[h] Add half edge\n[f] Increase vertex fatness\n"
160 "[g] Decrease vertex fatness\n[r] Rename vertex\n"
161 "[c] Change vertex color\n[Shift+key] as [key] "
162 "above, but loop\n[s] Save quiver\n[l] "
163 "Load quiver\n[q] Quit", /* */
164 [UIA_ASK_QUIT] = "Quit?\n\n[y] Confirm\n[n] Cancel", /* */
165 [UIA_DEC_FATNESS] = "[Mouse1] Decrease fatness\n[ESC] Cancel", /* */
166 [UIA_DELETE] = "[Mouse1] Delete vertex/edge\n[ESC] Cancel", /* */
167 [UIA_ENTER_LOAD] = "[Enter] Load from\n[ESC] Cancel", /* */
168 [UIA_ENTER_RENAME] = "[Enter] Rename\n[ESC] Cancel", /* */
169 [UIA_ENTER_SAVE] = "[Enter] Save to\n[ESC] Cancel", /* */
170 [UIA_ENTER_COLOR] = "[Enter] Use color (rrggbb)\n[ESC] Cancel", /* */
171 [UIA_INC_FATNESS] = "[Mouse1] Increase fatness\n[ESC] Cancel", /* */
172 [UIA_CHANGE_COLOR] = "[Mouse1] Change color\n[ESC] Cancel", /* */
173 [UIA_MUTATE] = "[Mouse1] Mutate at vertex\n[ESC] Cancel", /* */
174 [UIA_NEW_EDGE_1] = "[Mouse1] Select start\n[ESC] Cancel", /* */
175 [UIA_NEW_EDGE_2] = "[Mouse1] Select end\n[ESC] Cancel", /* */
176 [UIA_NEW_H_EDGE_1] = "[Mouse1] Select start\n[ESC] Cancel", /* */
177 [UIA_NEW_H_EDGE_2] = "[Mouse1] Select end\n[ESC] Cancel", /* */
178 [UIA_NEW_VERTEX] = "[Mouse1] Create new vertex\n[ESC] Cancel", /* */
179 [UIA_RENAME] = "[Mouse1] Rename vertex\n[ESC] Cancel", /* */
180 [UIA_LEN] = "" /* */
181 };
182
183 /* The texture containing what to show on the bottom */
184 static SDL_Texture *bottom_text[UIA_LEN];
185
186 /* The textures containing the names of all vertices - indexed just like q */
187 static SDL_Texture **vertex_names;
188
189 /* The number of elements of vertex_names */
190 static size_t vertex_names_len;
191
192 /* Drawing offset x */
193 static int offset_x;
194
195 /* Drawing offset x */
196 static int offset_y;
197
198 /* How wide (in pixels) a fatness 1 node should be */
199 static unsigned int base_node_radius = 8;
200
201 /* How much (in pixels) a node should widen for each fatness level */
202 static unsigned int node_radius_per_fatness = 7;
203
204 /* How wide (in pixels) the outline should be */
205 static int outline_width = 2;
206
207 /* How wide (in pixels) the arrowheads should be */
208 static int arrow_length = 7;
209
210 /* How narrow the arrowheads should be */
211 static double arrow_angle = 6.5 * M_PI / 8.0;
212
213 /* How close to an arrow (in pixels) for it to be selected */
214 static int edge_margin = 5;
215
216 /* If we're interacting with a vertex, which one */
217 static size_t selected_vertex = (size_t) -1;
218
219 /* If we're interacting with an edge, the i */
220 static size_t selected_edge_i = (size_t) -1;
221
222 /* If we're interacting with an edge, the j */
223 static size_t selected_edge_j = (size_t) -1;
224
225 /* If we're adding an edge, the last vertex we clicked on */
226 static size_t last_clicked_vertex = (size_t) -1;
227
228 /* If we're adding a new vertex, the number to use */
229 static uint16_t next_v_num = 1;
230
231 /* Memory for next vertex name */
232 static char next_v_name[32] = { 'v', '1', 0 };
233
234 /* x-coordinate of last mouse position */
235 static int last_mouse_x = -1;
236
237 /* y-coordinate of last mouse position */
238 static int last_mouse_y = -1;
239
240 /* Window title */
241 static char window_title[2048];
242
243 /* What name we last loaded/saved */
244 static char current_filename[2048] = { 'U', 'n', 't', 'i', 't', 'l', 'e', 'd',
245 0 };
246
247 /* Whether we've edited since last loading/saving */
248 static uint_fast8_t current_file_edited = 0;
249
250 /* Maximum length of an input string we'll accept */
251 static size_t max_input_size = 1 << 10;
252
253 /* Current position in input */
254 static size_t input_idx;
255
256 /* Current length of string held in input */
257 static size_t input_len;
258
259 /* If a string is being typed in, what it is (in UTF-8 as per SDL2) */
260 static char *input;
261
262 /* Input, with `Filename:' or `New name:' prepended (for rendering) */
263 static char *input_with_prefix;
264
265 /* Texture for what user is currently entering */
266 static SDL_Texture *input_texture;
267
268 /* Whether we need to re-render the input */
269 static uint_fast8_t rerender_input_string;
270
271 /* To prevent awkward repeats in SDL events, rate-limit `s' and `l' */
272 static uint_fast8_t save_load_delay;
273
274 /* If something needs to be freed next frame, but not before */
275 static void *free_this;
276
277 /* GCD */
278 static int
279 gcd(uint_fast8_t x, uint_fast8_t y)
280 {
281 uint_fast8_t r = 0;
282
283 if (!x &&
284 !y) {
285 return 1;
286 }
287
288 while (y) {
289 r = x % y;
290 x = y;
291 y = r;
292 }
293
294 return x;
295 }
296
297 /* Hex to uint */
298 static int
299 decode_hex(char *s, uint32_t *out_argb)
300 {
301 uint32_t z = 0;
302
303 while (*s &&
304 (*s == ' ' ||
305 *s == '#')) {
306 s++;
307 }
308
309 if (strlen(s) != 6) {
310 return -1;
311 }
312
313 while (*s) {
314 z <<= 4;
315
316 if ('0' <= *s &&
317 *s <= '9') {
318 z |= (*s - '0');
319 } else if ('a' <= *s &&
320 *s <= 'f') {
321 z |= (*s - 'a' + 10);
322 } else if ('A' <= *s &&
323 *s <= 'F') {
324 z |= (*s - 'A' + 10);
325 } else {
326 return -1;
327 }
328
329 s++;
330 }
331
332 *out_argb = z;
333
334 return 0;
335 }
336
337 /* Allocate and print a rational in the way a user expects */
338 static int
339 pretty_fraction(struct rational *r, char **out)
340 {
341 int ret = 0;
342
343 if (r->q == 1) {
344 size_t len = snprintf(0, 0, "%d", (int) r->p);
345
346 if (len + 1 < len) {
347 ret = errno = EOVERFLOW;
348 perror(L(""));
349 goto done;
350 }
351
352 if (!(*out = malloc(len + 1))) {
353 ret = errno;
354 perror(L("malloc"));
355 goto done;
356 }
357
358 sprintf(*out, "%d", (int) r->p);
359 goto done;
360 }
361
362 size_t len = snprintf(0, 0, "%d/%u", (int) r->p, (unsigned int) r->q);
363
364 if (len + 1 < len) {
365 ret = errno = EOVERFLOW;
366 perror(L(""));
367 goto done;
368 }
369
370 if (!(*out = malloc(len + 1))) {
371 ret = errno;
372 perror(L("malloc"));
373 goto done;
374 }
375
376 sprintf(*out, "%d/%u", (int) r->p, (unsigned int) r->q);
377 done:
378
379 return ret;
380 }
381
382 /* Render text to texture */
383 static int
384 render_text(const char *text, SDL_Texture **out)
385 {
386 if (!out) {
387 return 0;
388 }
389
390 if (*out) {
391 SDL_DestroyTexture(*out);
392 }
393
394 int ret = 0;
395 SDL_Surface *surf = 0;
396
397 if (!(surf = TTF_RenderUTF8_Blended_Wrapped(normal_font, text,
398 color_font, 800))) {
399 fprintf(stderr, L("TTF_RenderUTF8_Shaded(): %s\n"),
400 TTF_GetError());
401 ret = EINVAL;
402 goto done;
403 }
404
405 if (!(*out = SDL_CreateTextureFromSurface(sdl_renderer, surf))) {
406 fprintf(stderr, L("SDL_CreateTextureFromSurface(): %s\n"),
407 SDL_GetError());
408 ret = EINVAL;
409 goto done;
410 }
411
412 done:
413 SDL_FreeSurface(surf);
414
415 return ret;
416 }
417
418 /* Load fonts */
419 static int
420 load_fonts(void)
421 {
422 int ret = 0;
423
424 if (normal_font) {
425 TTF_CloseFont(normal_font);
426 normal_font = 0;
427 }
428
429 if (normal_font_rw) {
430 SDL_RWclose(normal_font_rw);
431 normal_font_rw = 0;
432 }
433
434 if (!(normal_font_rw = SDL_RWFromConstMem(ttf_memory,
435 sizeof_ttf_memory()))) {
436 ret = EINVAL;
437 fprintf(stderr, L("SDL_RWFromConstMem(): %s\n"),
438 SDL_GetError());
439 goto done;
440 }
441
442 if (!(normal_font = TTF_OpenFontIndexRW(normal_font_rw, 0,
443 base_font_size, 0))) {
444 ret = EINVAL;
445 fprintf(stderr, L("TTF_OpenFont(): %s\n"), TTF_GetError());
446 goto done;
447 }
448
449 for (size_t j = 0; j < UIA_LEN; ++j) {
450 if ((ret = render_text(bottom_string[j], &bottom_text[j]))) {
451 goto done;
452 }
453 }
454
455 done:
456
457 if (ret) {
458 if (normal_font) {
459 TTF_CloseFont(normal_font);
460 }
461
462 if (normal_font_rw) {
463 SDL_RWclose(normal_font_rw);
464 }
465
466 normal_font_rw = 0;
467 normal_font = 0;
468 }
469
470 return ret;
471 }
472
473 /* Insert str into input at given position */
474 static void
475 text_input(const char *str)
476 {
477 size_t l = strlen(str);
478
479 if (l + input_len + 1 >= max_input_size) {
480 return;
481 }
482
483 for (size_t k = input_len; k > input_idx; --k) {
484 input[k + l] = input[k];
485 }
486
487 /* Special-case for input_idx: 0 prohibits `>=' above */
488 input[input_idx + l] = input[input_idx];
489
490 for (size_t k = 0; k < l; ++k) {
491 input[input_idx + k] = str[k];
492 }
493
494 input_idx += l;
495 input_len += l;
496 rerender_input_string = 1;
497 }
498
499 /* Move input cursor left */
500 static void
501 text_input_left(void)
502 {
503 if (input_idx > 0) {
504 input_idx--;
505 }
506
507 while (input_idx > 0) {
508 unsigned char c = input[input_idx];
509
510 if ((c & 0xc0) == 0x80) {
511 input_idx--;
512 } else {
513 break;
514 }
515 }
516 }
517
518 /* Move input cursor right */
519 static void
520 text_input_right(void)
521 {
522 size_t adv = 1;
523 unsigned char c = input[input_idx];
524
525 if ((c & 0x80) == 0x0) {
526 adv = 1;
527 } else if ((c & 0xe0) == 0xc0) {
528 adv = 2;
529 } else if ((c & 0xf0) == 0xe0) {
530 adv = 3;
531 } else if ((c & 0xf8) == 0xf0) {
532 adv = 4;
533 }
534
535 if (input_idx + adv <= input_len) {
536 input_idx += adv;
537 }
538 }
539
540 /* Backspace */
541 static void
542 text_input_bs(void)
543 {
544 if (!input_idx) {
545 return;
546 }
547
548 size_t bs = 1;
549
550 while (input_idx > bs) {
551 unsigned char c = input[input_idx - bs];
552
553 if ((c & 0xc0) == 0x80) {
554 bs++;
555 } else {
556 break;
557 }
558 }
559
560 for (size_t k = input_idx - bs; k <= input_len - bs; k++) {
561 input[k] = input[k + bs];
562 }
563
564 input_len -= bs;
565 input_idx -= bs;
566 rerender_input_string = 1;
567 }
568
569 /* Set the title to something like `clav-sdl - foobar.txt*' */
570 static void
571 update_window_title(void)
572 {
573 size_t cutoff = sizeof (window_title) / sizeof (window_title[0]);
574 size_t r = snprintf(window_title, cutoff, "clav-sdl - %s%s",
575 current_filename, (current_file_edited ? "*" : ""));
576
577 if (r >= cutoff) {
578 window_title[cutoff - 1] = '\0';
579 }
580
581 SDL_SetWindowTitle(sdl_win, window_title);
582 }
583
584 /* Make sure the window title displays as edited */
585 static void
586 mark_as_edited(void)
587 {
588 if (current_file_edited) {
589 return;
590 }
591
592 current_file_edited = 1;
593 update_window_title();
594 }
595
596 /* Convert `internal coordinates' to pixel coordinates */
597 static void
598 internal_to_pixel_xy(int in_x, int in_y, int *out_x, int *out_y)
599 {
600 *out_x = in_x + offset_x;
601 *out_y = in_y + offset_y;
602 }
603
604 /* Convert pixel coordinates to `internal coordinates' */
605 static void
606 pixel_to_internal_xy(int in_x, int in_y, int *out_x, int *out_y)
607 {
608 *out_x = in_x - offset_x;
609 *out_y = in_y - offset_y;
610 }
611
612 /* Set selected_vertex and selected_edge_{i,j} */
613 static int
614 recalculate_selected_items(int mx, int my)
615 {
616 int x = 0;
617 int y = 0;
618 int ret = 0;
619 char *s = 0;
620 char *sij = 0;
621 char *sji = 0;
622
623 pixel_to_internal_xy(mx, my, &x, &y);
624 size_t last_vertex = selected_vertex;
625 size_t last_edge_i = selected_edge_i;
626 size_t last_edge_j = selected_edge_j;
627
628 selected_vertex = (size_t) -1;
629 selected_edge_i = (size_t) -1;
630 selected_edge_j = (size_t) -1;
631
632 if (last_vertex != (size_t) -1) {
633 struct vertex *v = &(q->v[last_vertex]);
634 int r = base_node_radius + v->fatness * node_radius_per_fatness;
635
636 if (x > v->x - r &&
637 x < v->x + r &&
638 y > v->y - r &&
639 y < v->y + r) {
640 selected_vertex = last_vertex;
641 goto compute_str;
642 }
643 }
644
645 for (size_t j = q->v_num; j > 0; --j) {
646 struct vertex *v = &(q->v[j - 1]);
647 int r = base_node_radius + v->fatness * node_radius_per_fatness;
648
649 if (x > v->x - r &&
650 x < v->x + r &&
651 y > v->y - r &&
652 y < v->y + r) {
653 selected_vertex = j - 1;
654 goto compute_str;
655 }
656 }
657
658 for (size_t j = 1; j < q->v_num; ++j) {
659 struct vertex *v1 = &(q->v[j]);
660
661 for (size_t i = 0; i < j; ++i) {
662 if (!q->e[i * q->v_len + j].p &&
663 !q->e[j * q->v_len + i].p) {
664 continue;
665 }
666
667 struct vertex *v2 = &(q->v[i]);
668
669 if ((x - edge_margin > v1->x &&
670 x - edge_margin > v2->x) ||
671 (x + edge_margin < v1->x &&
672 x + edge_margin < v2->x) ||
673 (y - edge_margin > v1->y &&
674 y - edge_margin > v2->y) ||
675 (y + edge_margin < v1->y &&
676 y + edge_margin < v2->y)) {
677 continue;
678 }
679
680 if (v1->x == v2->x) {
681 if (x + edge_margin > v1->x &&
682 x - edge_margin < v1->x) {
683 selected_edge_i = i;
684 selected_edge_j = j;
685 goto compute_str;
686 }
687 } else if (v1->y == v2->y) {
688 if (y + edge_margin > v1->y &&
689 y - edge_margin < v1->y) {
690 selected_edge_i = i;
691 selected_edge_j = j;
692 goto compute_str;
693 }
694 } else {
695 double m1 = ((double) (v2->y - v1->y)) /
696 ((double) (v2->x - v1->x));
697 double m2 = -1.0 / m1;
698 double xint = ((double) y - (double) v1->y +
699 m1 * v1->x - m2 * x) / (m1 - m2);
700 double yint = m1 * xint - m1 * v1->x +
701 (double) v1->y;
702
703 if ((x - xint) * (x - xint) + (y - yint) * (y -
704 yint)
705 < edge_margin * edge_margin) {
706 selected_edge_i = i;
707 selected_edge_j = j;
708 goto compute_str;
709 }
710 }
711 }
712 }
713
714 compute_str:
715
716 if (selected_vertex != (size_t) -1 &&
717 (selected_vertex != last_vertex ||
718 dragged_selected_vertex)) {
719 dragged_selected_vertex = 0;
720 struct vertex *v = &(q->v[selected_vertex]);
721 size_t len = snprintf(0, 0,
722 "Name: %s\nFatness: %d\nPosition: (%d,%d)",
723 v->name,
724 (int) v->fatness, v->x, v->y);
725
726 if (len + 1 < len) {
727 ret = errno = EOVERFLOW;
728 perror(L(""));
729 goto done;
730 }
731
732 if (!(s = malloc(len + 1))) {
733 ret = errno;
734 perror(L("malloc"));
735 goto done;
736 }
737
738 sprintf(s, "Name: %s\nFatness: %d\nPosition: (%d,%d)",
739 v->name, (int) v->fatness, v->x, v->y);
740
741 if ((ret = render_text(s, &selected_info))) {
742 goto done;
743 }
744 } else if ((selected_edge_i != last_edge_i ||
745 selected_edge_j != last_edge_j) &&
746 selected_edge_i != (size_t) -1 &&
747 selected_edge_j != (size_t) -1) {
748 struct vertex *i = &(q->v[selected_edge_i]);
749 struct vertex *j = &(q->v[selected_edge_j]);
750 struct rational *eij = &(q->e[selected_edge_i * q->v_len +
751 selected_edge_j]);
752 struct rational *eji = &(q->e[selected_edge_j * q->v_len +
753 selected_edge_i]);
754
755 if ((ret = pretty_fraction(eij, &sij))) {
756 goto done;
757 }
758
759 if ((ret = pretty_fraction(eji, &sji))) {
760 goto done;
761 }
762
763 size_t len = snprintf(0, 0,
764 "%s \u2192 %s: %s\n%s \u2192 %s: %s",
765 i->name, j->name, sij,
766 j->name, i->name, sji);
767
768 if (len + 1 < len) {
769 ret = errno = EOVERFLOW;
770 perror(L(""));
771 goto done;
772 }
773
774 if (!(s = malloc(len + 1))) {
775 ret = errno;
776 perror(L("malloc"));
777 goto done;
778 }
779
780 sprintf(s, "%s \u2192 %s: %s\n%s \u2192 %s: %s", i->name,
781 j->name, sij, j->name, i->name, sji);
782
783 if ((ret = render_text(s, &selected_info))) {
784 goto done;
785 }
786 }
787
788 done:
789 free(s);
790 free(sij);
791 free(sji);
792
793 return ret;
794 }
795
796 /* Render vertex names as textures */
797 static int
798 render_vertex_names(void)
799 {
800 if (vertex_names) {
801 for (size_t j = 0; j < vertex_names_len; ++j) {
802 SDL_DestroyTexture(vertex_names[j]);
803 vertex_names[j] = 0;
804 }
805 }
806
807 if (!q->v_num) {
808 return 0;
809 }
810
811 if ((q->v_num * sizeof *vertex_names) / q->v_num !=
812 sizeof *vertex_names) {
813 errno = EOVERFLOW;
814 perror(L(""));
815 vertex_names_len = 0;
816
817 return EOVERFLOW;
818 }
819
820 if (!(vertex_names = realloc(vertex_names, q->v_num *
821 sizeof(*vertex_names)))) {
822 int sv_err = errno;
823
824 perror(L("realloc"));
825 vertex_names_len = 0;
826
827 return sv_err;
828 }
829
830 vertex_names_len = q->v_num;
831
832 for (size_t j = 0; j < vertex_names_len; ++j) {
833 vertex_names[j] = 0;
834 }
835
836 for (size_t j = 0; j < vertex_names_len; ++j) {
837 int ret = 0;
838
839 if ((ret = render_text(q->v[j].name, &(vertex_names[j])))) {
840 return ret;
841 }
842 }
843
844 return 0;
845 }
846
847 /* Get information about the window */
848 static void
849 react_to_window_resized(void)
850 {
851 int old_pix_width = da_pix_width;
852 int old_pix_height = da_pix_height;
853
854 SDL_GetWindowSize(sdl_win, &da_pix_width, &da_pix_height);
855
856 if (old_pix_width == da_pix_width &&
857 old_pix_height == da_pix_height) {
858 return;
859 }
860
861 offset_x += (da_pix_width - old_pix_width) / 2;
862 offset_y += (da_pix_height - old_pix_height) / 2;
863 }
864
865 /* Pop from queue */
866 static void
867 eq_pop(struct ui_event *out)
868 {
869 if (eq_head == eq_tail) {
870 *out = (struct ui_event) { 0 };
871
872 return;
873 }
874
875 memcpy(out, eq_buf + eq_head, sizeof *out);
876 eq_buf[eq_head] = (struct ui_event) { 0 };
877 eq_head = (eq_head + 1) % eq_len;
878 }
879
880 /* Push into queue */
881 static int
882 eq_push(struct ui_event *in)
883 {
884 if (((eq_tail + 1) % eq_len) == eq_head) {
885 void *newmem;
886
887 if ((eq_len * sizeof *in) >= ((size_t) -1) / 2) {
888 fprintf(stderr, L(
889 "eq_push: Impossibly large buffer\n"));
890
891 return ENOMEM;
892 }
893
894 if ((eq_len * 2) / 2 != eq_len ||
895 (eq_len * 2 * sizeof *eq_buf) / (eq_len * 2) !=
896 sizeof *eq_buf) {
897 errno = EOVERFLOW;
898 perror(L(""));
899
900 return EOVERFLOW;
901 }
902
903 if (!(newmem = realloc(eq_buf, (eq_len * 2) *
904 sizeof *eq_buf))) {
905 int sv_err = errno;
906
907 perror(L("realloc"));
908
909 return sv_err;
910 }
911
912 eq_buf = (struct ui_event *) newmem;
913 eq_len *= 2;
914 }
915
916 memcpy(eq_buf + eq_tail, in, sizeof *in);
917 eq_tail = (eq_tail + 1) % eq_len;
918
919 return 0;
920 }
921
922 /* Initialize SDL */
923 int
924 ui_init(struct quiver *i_q)
925 {
926 int ret;
927
928 q = i_q;
929 size_t padding = strlen("Filename: ");
930
931 /* No need for overflow check, max_input_size is capped */
932 if (!(input_with_prefix = malloc(max_input_size + padding))) {
933 ret = errno;
934 perror(L("malloc"));
935
936 return ret;
937 }
938
939 strcpy(input_with_prefix, "Filename: ");
940 input = input_with_prefix + padding;
941 input_idx = 0;
942 input_len = 0;
943
944 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
945 fprintf(stderr, L("SDL_Init(): %s\n"), SDL_GetError());
946
947 return ENXIO;
948 }
949
950 sdl_win = SDL_CreateWindow("clav-sdl", SDL_WINDOWPOS_UNDEFINED,
951 SDL_WINDOWPOS_UNDEFINED, 1000, 1000,
952 SDL_WINDOW_SHOWN |
953 SDL_WINDOW_RESIZABLE);
954
955 if (!sdl_win) {
956 fprintf(stderr, L("SDL_CreateWindow(): %s\n"), SDL_GetError());
957
958 return EINVAL;
959 }
960
961 sdl_renderer = SDL_CreateRenderer(sdl_win, -1,
962 SDL_RENDERER_ACCELERATED);
963
964 if (!sdl_renderer) {
965 fprintf(stderr, L("SDL_CreateRenderer(): %s\n"),
966 SDL_GetError());
967
968 return EINVAL;
969 }
970
971 if (TTF_Init() < 0) {
972 fprintf(stderr, L("TTF_Init(): %s\n"), TTF_GetError());
973
974 return EINVAL;
975 }
976
977 if ((ret = load_fonts())) {
978 goto done;
979 }
980
981 if ((ret = render_vertex_names())) {
982 goto done;
983 }
984
985 if ((ret = SDL_SetRenderDrawColor(sdl_renderer, color_bg.r, color_bg.g,
986 color_bg.b, color_bg.a))) {
987 fprintf(stderr, L("SDL_SetRenderDrawColor(): %s\n"),
988 SDL_GetError());
989 goto done;
990 }
991
992 if ((ret = SDL_RenderClear(sdl_renderer))) {
993 fprintf(stderr, L("SDL_RenderClear(): %s\n"), SDL_GetError());
994 goto done;
995 }
996
997 update_window_title();
998 SDL_RenderPresent(sdl_renderer);
999 react_to_window_resized();
1000
1001 /* Set up queue for returning data */
1002 if (!(eq_buf = calloc(2, sizeof *eq_buf))) {
1003 ret = errno;
1004 perror(L("calloc"));
1005 goto done;
1006 }
1007
1008 eq_len = 2;
1009 eq_head = 0;
1010 eq_tail = 0;
1011 done:
1012
1013 return ret;
1014 }
1015
1016 /* Deal with the fact that the quiver was changed */
1017 int
1018 ui_respond_quiver_change(void)
1019 {
1020 return render_vertex_names();
1021 }
1022
1023 /* Acknowledge a successful load */
1024 int
1025 ui_respond_successful_load(const char *filename)
1026 {
1027 const char *tail = (const char *) strrchr(filename, '/');
1028
1029 if (!tail) {
1030 tail = filename;
1031 } else {
1032 tail++;
1033 }
1034
1035 size_t cutoff = sizeof(current_filename) / sizeof(current_filename[0]);
1036 size_t r = snprintf(current_filename, cutoff, "%s", tail);
1037
1038 if (r >= cutoff) {
1039 current_filename[cutoff - 1] = '\0';
1040 }
1041
1042 current_file_edited = 0;
1043 next_v_num = 1;
1044 update_window_title();
1045
1046 return 0;
1047 }
1048
1049 /* Acknowledge a successful save */
1050 int
1051 ui_respond_successful_save(const char *filename)
1052 {
1053 return ui_respond_successful_load(filename);
1054 }
1055
1056 /* Tear down SDL */
1057 int
1058 ui_teardown(void)
1059 {
1060 if (vertex_names) {
1061 for (size_t j = 0; j < vertex_names_len; ++j) {
1062 SDL_DestroyTexture(vertex_names[j]);
1063 vertex_names[j] = 0;
1064 }
1065
1066 free(vertex_names);
1067 vertex_names = 0;
1068 }
1069
1070 for (size_t j = 0; j < UIA_LEN; ++j) {
1071 SDL_DestroyTexture(bottom_text[j]);
1072 bottom_text[j] = 0;
1073 }
1074
1075 if (selected_info) {
1076 SDL_DestroyTexture(selected_info);
1077 selected_info = 0;
1078 }
1079
1080 if (input_texture) {
1081 SDL_DestroyTexture(input_texture);
1082 input_texture = 0;
1083 }
1084
1085 if (normal_font) {
1086 TTF_CloseFont(normal_font);
1087 normal_font = 0;
1088 }
1089
1090 if (normal_font_rw) {
1091 SDL_RWclose(normal_font_rw);
1092 normal_font_rw = 0;
1093 }
1094
1095 if (sdl_win) {
1096 SDL_DestroyWindow(sdl_win);
1097 sdl_win = 0;
1098 }
1099
1100 free(eq_buf);
1101 eq_buf = 0;
1102 free(input_with_prefix);
1103 input_with_prefix = 0;
1104 input = 0;
1105 SDL_Quit();
1106
1107 return 0;
1108 }
1109
1110 /* Record that a frame has been started */
1111 int
1112 ui_start_frame(void)
1113 {
1114 int ret = 0;
1115 int rho = 0;
1116 SDL_Rect r = { 0 };
1117 Uint32 dummy_format;
1118 int dummy_access;
1119 int tex_w;
1120 int tex_h;
1121
1122 frame_start_ticks = SDL_GetTicks();
1123
1124 if (!redraw) {
1125 goto done;
1126 }
1127
1128 redraw--;
1129
1130 /* Draw the damn thing */
1131 SDL_SetRenderDrawColor(sdl_renderer, color_bg.r, color_bg.g, color_bg.b,
1132 color_bg.a);
1133 SDL_RenderClear(sdl_renderer);
1134
1135 /* Special case for if text input is going on */
1136 if (rerender_input_string) {
1137 rerender_input_string = 0;
1138
1139 if ((ret = render_text(input_with_prefix, &input_texture))) {
1140 goto done;
1141 }
1142 }
1143
1144 /* Draw each edge */
1145 for (size_t j = 0; j < q->v_num; ++j) {
1146 for (size_t i = 0; i < j; ++i) {
1147 /* First, determine if we're looking at a half-edge or a full-edge */
1148 int d = gcd(q->v[i].fatness, q->v[j].fatness);
1149 struct rational *eij = &(q->e[i * q->v_len + j]);
1150 struct rational *eji = &(q->e[j * q->v_len + i]);
1151 int cx = 0;
1152 int cy = 0;
1153 int cx2 = 0;
1154 int cy2 = 0;
1155 double theta = 0.0;
1156
1157 if (!eij->p &&
1158 !eji->p) {
1159 continue;
1160 }
1161
1162 internal_to_pixel_xy(q->v[i].x, q->v[i].y, &cx, &cy);
1163 internal_to_pixel_xy(q->v[j].x, q->v[j].y, &cx2, &cy2);
1164
1165 if (selected_edge_i == i &&
1166 selected_edge_j == j) {
1167 if ((ret = SDL_SetRenderDrawColor(sdl_renderer,
1168 color_e_sel.r,
1169 color_e_sel.g,
1170 color_e_sel.b,
1171 color_e_sel.a)))
1172 {
1173 fprintf(stderr, L(
1174 "SDL_RenderDrawColor(): %s\n"),
1175 SDL_GetError());
1176 goto done;
1177 }
1178
1179 for (int id = -edge_margin; id < edge_margin;
1180 ++id) {
1181 for (int jd = -edge_margin; jd <
1182 edge_margin; ++jd) {
1183 if ((ret = SDL_RenderDrawLine(
1184 sdl_renderer, cx +
1185 id, cy + jd,
1186 cx2 + id, cy2 +
1187 jd))) {
1188 fprintf(stderr, L(
1189 "SDL_RenderDrawLine(): %s\n"),
1190 SDL_GetError());
1191 goto done;
1192 }
1193 }
1194 }
1195 }
1196
1197 /* This is the (eij)/dj = -(eji)/di condition */
1198 if (eij->p * q->v[i].fatness * eji->q != -eji->p *
1199 q->v[j].fatness * eij->q) {
1200 ret = SDL_SetRenderDrawColor(sdl_renderer,
1201 color_e_abnormal.r,
1202 color_e_abnormal.g,
1203 color_e_abnormal.b,
1204 color_e_abnormal.a);
1205 } else if (abs(eij->p) * d == q->v[j].fatness *
1206 eij->q) {
1207 ret = SDL_SetRenderDrawColor(sdl_renderer,
1208 color_e_normal.r,
1209 color_e_normal.g,
1210 color_e_normal.b,
1211 color_e_normal.a);
1212 } else if (2 * abs(eij->p) * d == q->v[j].fatness *
1213 eij->q) {
1214 ret = SDL_SetRenderDrawColor(sdl_renderer,
1215 color_e_half.r,
1216 color_e_half.g,
1217 color_e_half.b,
1218 color_e_half.a);
1219 } else {
1220 ret = SDL_SetRenderDrawColor(sdl_renderer,
1221 color_e_abnormal.r,
1222 color_e_abnormal.g,
1223 color_e_abnormal.b,
1224 color_e_abnormal.a);
1225 }
1226
1227 if (ret) {
1228 fprintf(stderr, L(
1229 "SDL_SetRenderDrawColor(): %s\n"),
1230 SDL_GetError());
1231 goto done;
1232 }
1233
1234 if ((ret = SDL_RenderDrawLine(sdl_renderer, cx, cy, cx2,
1235 cy2))) {
1236 fprintf(stderr, L("SDL_RenderDrawLine(): %s\n"),
1237 SDL_GetError());
1238 goto done;
1239 }
1240
1241 if (cx == cx2) {
1242 theta = (cy2 > cy) ? M_PI / 2.0 : -M_PI / 2.0;
1243 } else {
1244 theta = atan2f(cy2 - cy, cx2 - cx);
1245 }
1246
1247 if ((eij->p < 0)) {
1248 theta += M_PI;
1249 }
1250
1251 cx = (cx + cx2) / 2;
1252 cy = (cy + cy2) / 2;
1253 cx2 = cx + arrow_length * cos(theta + arrow_angle);
1254 cy2 = cy + arrow_length * sin(theta + arrow_angle);
1255
1256 if ((ret = SDL_RenderDrawLine(sdl_renderer, cx, cy, cx2,
1257 cy2))) {
1258 fprintf(stderr, L("SDL_RenderDrawLine(): %s\n"),
1259 SDL_GetError());
1260 goto done;
1261 }
1262
1263 if ((ret = SDL_RenderDrawLine(sdl_renderer, cx, cy, cx +
1264 arrow_length * cos(theta -
1265 arrow_angle),
1266 cy +
1267 arrow_length * sin(theta -
1268 arrow_angle))))
1269 {
1270 fprintf(stderr, L("SDL_RenderDrawLine(): %s\n"),
1271 SDL_GetError());
1272 goto done;
1273 }
1274 }
1275 }
1276
1277 /* Draw each vertex as a box */
1278 for (size_t j = 0; j < q->v_num; ++j) {
1279 struct vertex *v = &(q->v[j]);
1280 int cx = 0;
1281 int cy = 0;
1282
1283 internal_to_pixel_xy(v->x, v->y, &cx, &cy);
1284
1285 /* Central square */
1286 SDL_SetRenderDrawBlendMode(sdl_renderer, SDL_BLENDMODE_NONE);
1287 SDL_SetRenderDrawColor(sdl_renderer, v->r, v->g, v->b, 0xff);
1288 rho = base_node_radius + node_radius_per_fatness * v->fatness;
1289 r.x = cx - rho;
1290 r.y = cy - rho;
1291 r.w = 2 * rho;
1292 r.h = 2 * rho;
1293 SDL_RenderFillRect(sdl_renderer, &r);
1294
1295 /* Outline */
1296 SDL_SetRenderDrawBlendMode(sdl_renderer, SDL_BLENDMODE_BLEND);
1297
1298 if (j == selected_vertex ||
1299 j == last_clicked_vertex) {
1300 SDL_SetRenderDrawColor(sdl_renderer,
1301 color_outline_sel.r,
1302 color_outline_sel.g,
1303 color_outline_sel.b,
1304 color_outline_sel.a);
1305 } else {
1306 SDL_SetRenderDrawColor(sdl_renderer, color_outline.r,
1307 color_outline.g, color_outline.b,
1308 color_outline.a);
1309 }
1310
1311 r.x = cx - rho;
1312 r.y = cy - rho;
1313 r.w = 2 * rho - outline_width;
1314 r.h = outline_width;
1315 SDL_RenderFillRect(sdl_renderer, &r);
1316 r.x = cx + rho - outline_width;
1317 r.y = cy - rho;
1318 r.w = outline_width;
1319 r.h = 2 * rho - outline_width;
1320 SDL_RenderFillRect(sdl_renderer, &r);
1321 r.x = cx - rho + outline_width;
1322 r.y = cy + rho - outline_width;
1323 r.w = 2 * rho - outline_width;
1324 r.h = outline_width;
1325 SDL_RenderFillRect(sdl_renderer, &r);
1326 r.x = cx - rho;
1327 r.y = cy - rho + outline_width;
1328 r.w = outline_width;
1329 r.h = 2 * rho - outline_width;
1330 SDL_RenderFillRect(sdl_renderer, &r);
1331
1332 /* Text */
1333 if (j >= vertex_names_len) {
1334 fprintf(stderr, L(
1335 "render_vertex_names() was not called, somehow\n"));
1336 ret = EINVAL;
1337 goto done;
1338 }
1339
1340 if (SDL_QueryTexture(vertex_names[j], &dummy_format,
1341 &dummy_access, &tex_w, &tex_h)) {
1342 fprintf(stderr, L("SDL_QueryTexture(): %s\n"),
1343 SDL_GetError());
1344 ret = EINVAL;
1345 goto done;
1346 }
1347
1348 r.x = cx - tex_w / 2;
1349 r.y = cy - tex_h / 2;
1350 r.w = tex_w;
1351 r.h = tex_h;
1352 SDL_RenderCopy(sdl_renderer, vertex_names[j], 0, &r);
1353 }
1354
1355 /* If adding a new vertex, draw preview */
1356 if (ui_action == UIA_NEW_VERTEX &&
1357 last_mouse_x != -1 &&
1358 last_mouse_y != -1) {
1359 /* Central square */
1360 SDL_SetRenderDrawBlendMode(sdl_renderer, SDL_BLENDMODE_NONE);
1361 SDL_SetRenderDrawColor(sdl_renderer, color_v_preview.r,
1362 color_v_preview.g, color_v_preview.b,
1363 color_v_preview.a);
1364 rho = base_node_radius;
1365 r.x = last_mouse_x - rho;
1366 r.y = last_mouse_y - rho;
1367 r.w = 2 * rho;
1368 r.h = 2 * rho;
1369 SDL_RenderFillRect(sdl_renderer, &r);
1370
1371 /* Outline */
1372 SDL_SetRenderDrawBlendMode(sdl_renderer, SDL_BLENDMODE_BLEND);
1373 SDL_SetRenderDrawColor(sdl_renderer, color_outline_preview.r,
1374 color_outline_preview.g,
1375 color_outline_preview.b,
1376 color_outline_preview.a);
1377 r.x = last_mouse_x - rho;
1378 r.y = last_mouse_y - rho;
1379 r.w = 2 * rho - outline_width;
1380 r.h = outline_width;
1381 SDL_RenderFillRect(sdl_renderer, &r);
1382 r.x = last_mouse_x + rho - outline_width;
1383 r.y = last_mouse_y - rho;
1384 r.w = outline_width;
1385 r.h = 2 * rho - outline_width;
1386 SDL_RenderFillRect(sdl_renderer, &r);
1387 r.x = last_mouse_x - rho + outline_width;
1388 r.y = last_mouse_y + rho - outline_width;
1389 r.w = 2 * rho - outline_width;
1390 r.h = outline_width;
1391 SDL_RenderFillRect(sdl_renderer, &r);
1392 r.x = last_mouse_x - rho;
1393 r.y = last_mouse_y - rho + outline_width;
1394 r.w = outline_width;
1395 r.h = 2 * rho - outline_width;
1396 SDL_RenderFillRect(sdl_renderer, &r);
1397 }
1398
1399 /* If adding a new edge, draw possible */
1400 if ((ui_action == UIA_NEW_EDGE_2 ||
1401 ui_action == UIA_NEW_H_EDGE_2) &&
1402
1403 /* last_clicked_vertex != (size_t) -1 && */
1404 last_mouse_x != -1 &&
1405 last_mouse_y != -1) {
1406 int cx = 0;
1407 int cy = 0;
1408
1409 if ((ret = SDL_SetRenderDrawColor(sdl_renderer,
1410 color_e_normal.r,
1411 color_e_normal.g,
1412 color_e_normal.b,
1413 color_e_normal.a))) {
1414 fprintf(stderr, L("SDL_RenderDrawLine(): %s\n"),
1415 SDL_GetError());
1416 goto done;
1417 }
1418
1419 internal_to_pixel_xy(q->v[last_clicked_vertex].x,
1420 q->v[last_clicked_vertex].y, &cx, &cy);
1421
1422 if ((ret = SDL_RenderDrawLine(sdl_renderer, cx, cy,
1423 last_mouse_x, last_mouse_y))) {
1424 fprintf(stderr, L("SDL_RenderDrawLine(): %s\n"),
1425 SDL_GetError());
1426 goto done;
1427 }
1428 }
1429
1430 /* Bottom text */
1431 if (SDL_QueryTexture(bottom_text[ui_action], &dummy_format,
1432 &dummy_access, &tex_w, &tex_h)) {
1433 fprintf(stderr, L("SDL_QueryTexture(): %s\n"), SDL_GetError());
1434 ret = EINVAL;
1435 goto done;
1436 }
1437
1438 r.x = text_border_padding;
1439 r.y = da_pix_height - tex_h - text_border_padding;
1440 r.w = tex_w;
1441 r.h = tex_h;
1442 SDL_RenderCopy(sdl_renderer, bottom_text[ui_action], 0, &r);
1443
1444 /* If something is selected */
1445 if (selected_info &&
1446 (selected_vertex != (size_t) -1 ||
1447 (selected_edge_i != (size_t) -1 &&
1448 selected_edge_j != (size_t) -1))) {
1449 if (SDL_QueryTexture(selected_info, &dummy_format,
1450 &dummy_access, &tex_w, &tex_h)) {
1451 fprintf(stderr, L("SDL_QueryTexture(): %s\n"),
1452 SDL_GetError());
1453 ret = EINVAL;
1454 goto done;
1455 }
1456
1457 r.x = text_border_padding;
1458 r.y = text_border_padding;
1459 r.w = tex_w;
1460 r.h = tex_h;
1461 SDL_RenderCopy(sdl_renderer, selected_info, 0, &r);
1462 }
1463
1464 /* If user is entering text */
1465 if (ui_action == UIA_ENTER_SAVE ||
1466 ui_action == UIA_ENTER_LOAD ||
1467 ui_action == UIA_ENTER_RENAME ||
1468 ui_action == UIA_ENTER_COLOR) {
1469 if (SDL_QueryTexture(bottom_text[ui_action], &dummy_format,
1470 &dummy_access, &tex_w, &tex_h)) {
1471 fprintf(stderr, L("SDL_QueryTexture(): %s\n"),
1472 SDL_GetError());
1473 ret = EINVAL;
1474 goto done;
1475 }
1476
1477 r.x = text_border_padding;
1478 r.y = da_pix_height - tex_h - text_border_padding;
1479
1480 if (SDL_QueryTexture(input_texture, &dummy_format,
1481 &dummy_access, &tex_w, &tex_h)) {
1482 fprintf(stderr, L("SDL_QueryTexture(): %s\n"),
1483 SDL_GetError());
1484 ret = EINVAL;
1485 goto done;
1486 }
1487
1488 r.y -= (tex_h + text_border_padding);
1489 r.w = tex_w;
1490 r.h = tex_h;
1491 SDL_RenderCopy(sdl_renderer, input_texture, 0, &r);
1492
1493 /* Now draw a cursor */
1494 char store_idxchar = input[input_idx];
1495
1496 input[input_idx] = '\0';
1497
1498 if ((ret = TTF_SizeUTF8(normal_font, input_with_prefix, &tex_w,
1499 &tex_h))) {
1500 fprintf(stderr, L("TTF_SizeText(): %s\n"),
1501 TTF_GetError());
1502 goto done;
1503 }
1504
1505 input[input_idx] = store_idxchar;
1506
1507 if ((ret = SDL_SetRenderDrawColor(sdl_renderer, color_font.r,
1508 color_font.g, color_font.b,
1509 color_font.a))) {
1510 fprintf(stderr, L("SDL_SetRenderDrawColor(): %s\n"),
1511 SDL_GetError());
1512 goto done;
1513 }
1514
1515 if ((ret = SDL_RenderDrawLine(sdl_renderer, r.x + tex_w, r.y,
1516 r.x + tex_w, r.y + tex_h))) {
1517 fprintf(stderr, L("SDL_RenderDrawLine(): %s\n"),
1518 SDL_GetError());
1519 goto done;
1520 }
1521 }
1522
1523 done:
1524
1525 return ret;
1526 }
1527
1528 /* Draw a frame, possibly sleeping for framelimit */
1529 int
1530 ui_finish_frame(void)
1531 {
1532 int ret = 0;
1533 struct ui_event ui_e = { 0 };
1534 SDL_Event sdl_e = { 0 };
1535 Uint32 now = 0;
1536 uint_fast8_t save_requested = 0;
1537 uint_fast8_t load_requested = 0;
1538 int color_ret = 0;
1539 uint_fast8_t color_affirmed = 0;
1540
1541 if (free_this) {
1542 free(free_this);
1543 free_this = 0;
1544 }
1545
1546 if (save_load_delay) {
1547 save_load_delay--;
1548 }
1549
1550 SDL_RenderPresent(sdl_renderer);
1551
1552 /* Handle user input */
1553 while (SDL_PollEvent(&sdl_e) != 0) {
1554 /*
1555 * Redraw should be at least 2, to deal with
1556 * double-buffering. Triple-buffering is occasionally
1557 * used, let's go with 4 to be safe.
1558 */
1559 redraw = 4;
1560 SDL_Keycode k = 0;
1561 SDL_Keymod m = 0;
1562
1563 switch (sdl_e.type) {
1564 case SDL_QUIT:
1565 ui_e = (struct ui_event) { .type = ET_QUIT };
1566 ret = eq_push(&ui_e);
1567 break;
1568 case SDL_TEXTINPUT:
1569 text_input(sdl_e.text.text);
1570 break;
1571 case SDL_KEYDOWN:
1572
1573 if (sdl_e.key.repeat) {
1574 break;
1575 }
1576
1577 k = sdl_e.key.keysym.sym;
1578 m = sdl_e.key.keysym.mod;
1579
1580 switch (ui_action) {
1581 case UIA_ENTER_SAVE:
1582 case UIA_ENTER_LOAD:
1583 case UIA_ENTER_RENAME:
1584 case UIA_ENTER_COLOR:
1585
1586 if (k == SDLK_ESCAPE) {
1587 SDL_StopTextInput();
1588 ui_action = UIA_NONE;
1589 last_clicked_vertex = (size_t) -1;
1590 } else if (k == SDLK_RETURN ||
1591 k == SDLK_RETURN2) {
1592 SDL_StopTextInput();
1593 ui_e = (struct ui_event) { .str =
1594 input };
1595
1596 if (ui_action == UIA_ENTER_SAVE) {
1597 ui_e.type = ET_SAVE;
1598 } else if (ui_action ==
1599 UIA_ENTER_LOAD) {
1600 ui_e.type = ET_LOAD;
1601 } else if (ui_action ==
1602 UIA_ENTER_RENAME) {
1603 ui_e.type = ET_RENAME;
1604 ui_e.idx_1 =
1605 last_clicked_vertex;
1606 } else if (ui_action ==
1607 UIA_ENTER_COLOR) {
1608 ui_e.type = ET_CHANGE_COLOR;
1609 ui_e.idx_1 =
1610 last_clicked_vertex;
1611 ui_e.str = 0;
1612
1613 if (decode_hex(input,
1614 &ui_e.z)) {
1615 ui_action =
1616 ui_action_loop ?
1617 UIA_CHANGE_COLOR
1618 :
1619 UIA_NONE;
1620 last_clicked_vertex =
1621 (size_t) -1;
1622 break;
1623 }
1624 }
1625
1626 ret = eq_push(&ui_e);
1627
1628 if (ui_action_loop) {
1629 if (ui_action ==
1630 UIA_ENTER_RENAME) {
1631 ui_action = UIA_RENAME;
1632 } else if (ui_action ==
1633 UIA_ENTER_COLOR) {
1634 ui_action =
1635 UIA_CHANGE_COLOR;
1636 }
1637 } else {
1638 ui_action = UIA_NONE;
1639 }
1640
1641 last_clicked_vertex = (size_t) -1;
1642 } else if (k == SDLK_LEFT) {
1643 text_input_left();
1644 } else if (k == SDLK_RIGHT) {
1645 text_input_right();
1646 } else if (k == SDLK_BACKSPACE) {
1647 text_input_bs();
1648 }
1649
1650 break;
1651 case UIA_NONE:
1652
1653 if (k == SDLK_q) {
1654 ui_action = UIA_ASK_QUIT;
1655 } else if (k == SDLK_d) {
1656 ui_action = UIA_DELETE;
1657 ui_action_loop = (m & KMOD_SHIFT);
1658 } else if (k == SDLK_e) {
1659 ui_action = UIA_NEW_EDGE_1;
1660 ui_action_loop = (m & KMOD_SHIFT);
1661 } else if (k == SDLK_f) {
1662 ui_action = UIA_INC_FATNESS;
1663 ui_action_loop = (m & KMOD_SHIFT);
1664 } else if (k == SDLK_g) {
1665 ui_action = UIA_DEC_FATNESS;
1666 ui_action_loop = (m & KMOD_SHIFT);
1667 } else if (k == SDLK_c) {
1668 ui_action = UIA_CHANGE_COLOR;
1669 ui_action_loop = (m & KMOD_SHIFT);
1670 } else if (k == SDLK_h) {
1671 ui_action = UIA_NEW_H_EDGE_1;
1672 ui_action_loop = (m & KMOD_SHIFT);
1673 } else if (k == SDLK_m) {
1674 ui_action = UIA_MUTATE;
1675 ui_action_loop = (m & KMOD_SHIFT);
1676 } else if (k == SDLK_r) {
1677 ui_action = UIA_RENAME;
1678 ui_action_loop = (m & KMOD_SHIFT);
1679 } else if (k == SDLK_v) {
1680 ui_action = UIA_NEW_VERTEX;
1681 ui_action_loop = (m & KMOD_SHIFT);
1682 } else if (k == SDLK_l &&
1683 !save_load_delay) {
1684 /* Don't load - SDL_KEYDOWN repeats */
1685 load_requested = 1;
1686 } else if (k == SDLK_s &&
1687 !save_load_delay) {
1688 save_requested = 1;
1689 }
1690
1691 break;
1692 case UIA_ASK_QUIT:
1693
1694 if (k == SDLK_n ||
1695 k == SDLK_ESCAPE) {
1696 ui_action = UIA_NONE;
1697 } else if (k == SDLK_y) {
1698 ui_e = (struct ui_event) { .type =
1699 ET_QUIT };
1700 ret = eq_push(&ui_e);
1701 ui_action = UIA_NONE;
1702 }
1703
1704 break;
1705 default:
1706
1707 if (k == SDLK_q ||
1708 k == SDLK_ESCAPE) {
1709 ui_action = UIA_NONE;
1710 }
1711
1712 break;
1713 }
1714
1715 break;
1716 case SDL_WINDOWEVENT:
1717
1718 if (sdl_e.window.event == SDL_WINDOWEVENT_RESIZED ||
1719 sdl_e.window.event == SDL_WINDOWEVENT_MAXIMIZED ||
1720 sdl_e.window.event == SDL_WINDOWEVENT_RESTORED) {
1721 react_to_window_resized();
1722 } else if (sdl_e.window.event ==
1723 SDL_WINDOWEVENT_LEAVE) {
1724 /* This tells the dragging code to not respond */
1725 last_mouse_x = -1;
1726 last_mouse_y = -1;
1727 }
1728
1729 break;
1730 case SDL_MOUSEMOTION:
1731
1732 if (sdl_e.motion.state & SDL_BUTTON_LMASK) {
1733 int x = sdl_e.motion.x;
1734 int y = sdl_e.motion.y;
1735
1736 if (last_mouse_x >= 0 &&
1737 last_mouse_y >= 0) {
1738 if (selected_vertex != (size_t) -1) {
1739 q->v[selected_vertex].x += (x -
1740 last_mouse_x);
1741 q->v[selected_vertex].y += (y -
1742 last_mouse_y);
1743 dragged_selected_vertex = 1;
1744 recalculate_selected_items(
1745 sdl_e.motion.x,
1746 sdl_e.motion.y);
1747 mark_as_edited();
1748 } else {
1749 offset_x += (x - last_mouse_x);
1750 offset_y += (y - last_mouse_y);
1751 }
1752 }
1753 } else {
1754 recalculate_selected_items(sdl_e.motion.x,
1755 sdl_e.motion.y);
1756 }
1757
1758 last_mouse_x = sdl_e.motion.x;
1759 last_mouse_y = sdl_e.motion.y;
1760 break;
1761 case SDL_MOUSEBUTTONUP:
1762
1763 if ((sdl_e.button.state & SDL_BUTTON_LMASK) &&
1764 ui_action != UIA_NEW_VERTEX) {
1765 last_mouse_x = -1;
1766 last_mouse_y = -1;
1767 }
1768
1769 recalculate_selected_items(sdl_e.button.x,
1770 sdl_e.button.y);
1771 break;
1772 case SDL_MOUSEBUTTONDOWN:
1773
1774 if (!(sdl_e.button.state & SDL_BUTTON_LMASK)) {
1775 break;
1776 }
1777
1778 if (ui_action != UIA_NEW_VERTEX) {
1779 last_mouse_x = -1;
1780 last_mouse_y = -1;
1781 }
1782
1783 switch (ui_action) {
1784 case UIA_MUTATE:
1785
1786 if (selected_vertex == (size_t) -1) {
1787 break;
1788 }
1789
1790 ui_e = (struct ui_event) {
1791 /* */
1792 .type = ET_MUTATE, .idx_1 =
1793 selected_vertex
1794 };
1795 ret = eq_push(&ui_e);
1796 ui_action = ui_action_loop ? UIA_MUTATE :
1797 UIA_NONE;
1798 break;
1799 case UIA_CHANGE_COLOR:
1800
1801 if (selected_vertex == (size_t) -1) {
1802 break;
1803 }
1804
1805 ui_e = (struct ui_event) {
1806 /* */
1807 .type = ET_CHANGE_COLOR, .idx_1 =
1808 selected_vertex, .z = 0
1809 };
1810 color_ret = choose_color(&ui_e.z,
1811 &color_affirmed);
1812
1813 if (!color_ret) {
1814 if (color_affirmed) {
1815 ret = eq_push(&ui_e);
1816 }
1817
1818 ui_action = ui_action_loop ?
1819 UIA_CHANGE_COLOR : UIA_NONE;
1820 } else {
1821 ui_action = UIA_ENTER_COLOR;
1822 last_clicked_vertex = selected_vertex;
1823 input_idx = 0;
1824 input_len = 0;
1825 input[0] = '\0';
1826 SDL_StartTextInput();
1827
1828 /* Intentionally not copying null terminator */
1829 strncpy(input_with_prefix, " rrggbb: ",
1830 10);
1831 rerender_input_string = 1;
1832 }
1833
1834 break;
1835 case UIA_NEW_VERTEX:
1836
1837 if (selected_vertex != (size_t) -1 ||
1838 selected_edge_i != (size_t) -1 ||
1839 selected_edge_j != (size_t) -1) {
1840 break;
1841 }
1842
1843 int cx = sdl_e.button.x - offset_x;
1844 int cy = sdl_e.button.y - offset_y;
1845
1846 sprintf(next_v_name, "v%zu",
1847 (size_t) next_v_num);
1848 next_v_num++;
1849 ui_e = (struct ui_event) {
1850 /* */
1851 .type = ET_NEW_VERTEX, .int_1 = cx,
1852 .int_2 = cy, .z = (color_v.r << 16) |
1853 (color_v.g << 8) |
1854 color_v.b, .str =
1855 next_v_name,
1856 };
1857 ret = eq_push(&ui_e);
1858 ui_action = ui_action_loop ? UIA_NEW_VERTEX :
1859 UIA_NONE;
1860 break;
1861 case UIA_NEW_EDGE_1:
1862 case UIA_NEW_H_EDGE_1:
1863 case UIA_RENAME:
1864
1865 if (selected_vertex == (size_t) -1) {
1866 if (!ui_action_loop) {
1867 ui_action = UIA_NONE;
1868 }
1869
1870 break;
1871 }
1872
1873 last_clicked_vertex = selected_vertex;
1874
1875 if (ui_action == UIA_NEW_EDGE_1) {
1876 ui_action = UIA_NEW_EDGE_2;
1877 } else if (ui_action == UIA_NEW_H_EDGE_1) {
1878 ui_action = UIA_NEW_H_EDGE_2;
1879 } else if (ui_action == UIA_RENAME) {
1880 ui_action = UIA_ENTER_RENAME;
1881 input_len = 0;
1882 input_idx = 0;
1883 input[0] = '\0';
1884 SDL_StartTextInput();
1885
1886 /* Intentionally not copying null terminator */
1887 strncpy(input_with_prefix, "New name: ",
1888 10);
1889 rerender_input_string = 1;
1890 }
1891
1892 break;
1893 case UIA_NEW_EDGE_2:
1894 case UIA_NEW_H_EDGE_2:
1895
1896 if (selected_vertex == (size_t) -1 ||
1897 selected_vertex == last_clicked_vertex) {
1898 switch (ui_action) {
1899 case UIA_NEW_EDGE_2:
1900 ui_action = UIA_NEW_EDGE_1;
1901 break;
1902 case UIA_NEW_H_EDGE_2:
1903 ui_action = UIA_NEW_H_EDGE_1;
1904 break;
1905 default:
1906 ui_action = UIA_NONE;
1907 }
1908
1909 last_clicked_vertex = (size_t) -1;
1910 break;
1911 }
1912
1913 ui_e = (struct ui_event) {
1914 /* */
1915 .type = ET_NEW_EDGE, .idx_1 =
1916 last_clicked_vertex, .idx_2 =
1917 selected_vertex, .a = 1, .b =
1918 (ui_action == UIA_NEW_EDGE_2 ?
1919 1 : 2)
1920 };
1921 ret = eq_push(&ui_e);
1922
1923 if (!ui_action_loop) {
1924 ui_action = UIA_NONE;
1925 } else if (ui_action == UIA_NEW_EDGE_2) {
1926 ui_action = UIA_NEW_EDGE_1;
1927 } else {
1928 ui_action = UIA_NEW_H_EDGE_1;
1929 }
1930
1931 last_clicked_vertex = (size_t) -1;
1932 break;
1933 case UIA_DELETE:
1934
1935 if (selected_vertex != (size_t) -1) {
1936 ui_e = (struct ui_event) {
1937 /* */
1938 .type = ET_DELETE_VERTEX,
1939 .idx_1 = selected_vertex
1940 };
1941 ret = eq_push(&ui_e);
1942 } else if (selected_edge_i != (size_t) -1 &&
1943 selected_edge_j != (size_t) -1) {
1944 ui_e = (struct ui_event) {
1945 /* */
1946 .type = ET_DELETE_EDGE, .idx_1 =
1947 selected_edge_i,
1948 .idx_2 =
1949 selected_edge_j
1950 };
1951 ret = eq_push(&ui_e);
1952 }
1953
1954 ui_action = ui_action_loop ? UIA_DELETE :
1955 UIA_NONE;
1956 break;
1957 case UIA_INC_FATNESS:
1958 case UIA_DEC_FATNESS:
1959
1960 if (selected_vertex == (size_t) -1) {
1961 break;
1962 }
1963
1964 ui_e = (struct ui_event) {
1965 /* */
1966 .type = ET_CHANGE_FATNESS, .idx_1 =
1967 selected_vertex, .int_1 =
1968 (ui_action ==
1969 UIA_INC_FATNESS
1970 ? 1 : -1)
1971 };
1972 ret = eq_push(&ui_e);
1973
1974 if (!ui_action_loop) {
1975 ui_action = UIA_NONE;
1976 }
1977
1978 break;
1979 case UIA_NONE:
1980 case UIA_ASK_QUIT:
1981 case UIA_ENTER_SAVE:
1982 case UIA_ENTER_LOAD:
1983 case UIA_ENTER_RENAME:
1984 case UIA_ENTER_COLOR:
1985 case UIA_LEN:
1986 break;
1987 }
1988
1989 break;
1990 }
1991
1992 if (ret) {
1993 goto done;
1994 }
1995 }
1996
1997 if (load_requested ||
1998 save_requested) {
1999 save_load_delay = 30;
2000 char *f = 0;
2001 int r = 0;
2002
2003 if (load_requested) {
2004 r = choose_load_file(&f);
2005 } else {
2006 r = choose_save_file(&f);
2007 }
2008
2009 if (!r) {
2010 if (f) {
2011 ui_e = (struct ui_event) { .str = f };
2012 ui_e.type = load_requested ? ET_LOAD : ET_SAVE;
2013
2014 /* f is freed on next ui_finish_frame */
2015 free_this = f;
2016 ret = eq_push(&ui_e);
2017 }
2018 } else {
2019 ui_action = load_requested ? UIA_ENTER_LOAD :
2020 UIA_ENTER_SAVE;
2021 input_idx = 0;
2022 input_len = 0;
2023 input[0] = '\0';
2024 SDL_StartTextInput();
2025
2026 /* Intentionally not copying null terminator */
2027 strncpy(input_with_prefix, "Filename: ", 10);
2028 rerender_input_string = 1;
2029 }
2030 }
2031
2032 /* framelimit */
2033 now = SDL_GetTicks();
2034
2035 if (frame_start_ticks < now) {
2036 Uint32 elapsed_time = now - frame_start_ticks;
2037
2038 if (elapsed_time < TICKS_PER_FRAME) {
2039 SDL_Delay(TICKS_PER_FRAME - elapsed_time);
2040 }
2041 }
2042
2043 done:
2044
2045 return ret;
2046 }
2047
2048 /* Return an event to the main loop */
2049 int
2050 ui_get_event(struct ui_event *e, uint_fast8_t *more)
2051 {
2052 eq_pop(e);
2053 *more = eq_head != eq_tail;
2054
2055 if (e) {
2056 switch (e->type) {
2057 case ET_NONE:
2058 case ET_LOAD:
2059 case ET_SAVE:
2060 case ET_QUIT:
2061 break;
2062 case ET_CHANGE_FATNESS:
2063 case ET_CHANGE_COLOR:
2064 case ET_DELETE_EDGE:
2065 case ET_DELETE_VERTEX:
2066 case ET_MUTATE:
2067 case ET_NEW_EDGE:
2068 case ET_NEW_VERTEX:
2069 case ET_RENAME:
2070 mark_as_edited();
2071 break;
2072 }
2073 }
2074
2075 return 0;
2076 }
A program to visualize cluster algebras as quivers