9 static void parse_args (gint
*p_argc
,
12 duplicate_and_stroke (cairo_t
*cr
);
13 static void stroke_and_destroy (cairo_t
*cr
,
16 static void browsing (GtkWidget
*widget
,
17 GdkEventExpose
*event
,
19 static void browsing_segment (GtkToggleButton
*togglebutton
,
21 static void browsing_primitive (GtkToggleButton
*togglebutton
,
23 static void browsing_reset (GtkButton
*button
,
25 static void browsing_next (GtkButton
*button
,
28 static void arcs (GtkWidget
*widget
,
29 GdkEventExpose
*event
,
31 static void arc3p (cairo_t
*cr
,
39 static void intersections (GtkWidget
*widget
,
40 GdkEventExpose
*event
,
43 static void offset_curves (GtkWidget
*widget
,
44 GdkEventExpose
*event
,
47 static void offset_segments (GtkWidget
*widget
,
48 GdkEventExpose
*event
,
51 static void circle_callback (cairo_t
*cr
);
52 static void piston_callback (cairo_t
*cr
);
53 static void curve1_callback (cairo_t
*cr
);
54 static void line1_callback (cairo_t
*cr
);
58 cairo_path_t
*cairo_path
;
61 CpmlPrimitive primitive
;
66 static CpmlPair bezier_samples
[][4] = {
67 { { 0, 0 }, { 0, 40 }, { 120, 40 }, { 120, 0 } }, /* Simmetric low */
68 { { 40, 0 }, { 40, 160 }, { 80, 160 }, { 80, 0 } }, /* Simmetric high */
69 { { 0, 0 }, { 33.1371, 33.1371 }, { 86.8629, 33.1371 }, { 120, 0 } },
70 /* Arc approximation */
71 { { 0, 0 }, { 70, 120 }, { 50, 120 }, { 120, 0 } }, /* Twisted controls */
73 { { 0, 0 }, { 0, 120 }, { 60, 120 }, { 120, 0 } }, /* Vertical p1-p2 */
74 { { 0, 0 }, { 60, 120 }, { 120, 120 }, { 120, 0 } },/* Vertical p3-p4 */
75 { { 0, 120 }, { 120, 120 }, { 120, 60 }, { 0, 0 } },/* Horizontal p1-p2 */
76 { { 0, 120 }, { 120, 60 }, { 120, 0 }, { 0, 0 } }, /* Horizontal p3-p4 */
78 { { 0, 0 }, { 0, 120 }, { 120, 120 }, { 120, 0 } }, /* Down */
79 { { 0, 120 }, { 120, 120 }, { 120, 0 }, { 0, 0 } }, /* Right */
80 { { 0, 120 }, { 0, 0 }, { 120, 0 }, { 120, 120 } }, /* Up */
81 { { 120, 120 }, { 0, 120 }, { 0, 0 }, { 120, 0 } }, /* Left */
83 { { 0, 60 }, { 60, 120 }, { 120, 60 }, { 60, 0 } }, /* Down-right */
84 { { 60, 120 }, { 120, 60 }, { 60, 0 }, { 0, 60 } }, /* Up-right */
85 { { 120, 60 }, { 60, 0 }, { 0, 60 }, { 60, 120 } }, /* Up-left */
86 { { 60, 0 }, { 0, 60 }, { 60, 120 }, { 120, 60 } }, /* Down-left*/
88 { { 0, 0 }, { 60, 0 }, { 60, 120 }, { 120, 120 } }, /* Step left */
89 { { 120, 0 }, { 60, 0 }, { 60, 120 }, { 0, 120 } }, /* Step right */
90 { { 0, 0 }, { 60, 90 }, { 90, 120 }, { 120, 90 } }, /* Unbalanced opened */
91 { { 0, 0 }, { 40, 120 }, { 120, 120 }, { 60, 80 } } /* Unbalanced closed */
94 static void (*path_samples
[]) (cairo_t
*cr
) = {
103 main(gint argc
, gchar
**argv
)
110 parse_args(&argc
, &argv
);
112 path
= demo_find_data_file("cpml-demo.ui");
114 g_print("cpml-demo.ui not found!\n");
118 builder
= gtk_builder_new();
121 gtk_builder_add_from_file(builder
, path
, &error
);
123 g_print("%s\n", error
->message
);
127 window
= (GtkWidget
*) gtk_builder_get_object(builder
, "wndMain");
129 /* Connect signals */
130 g_signal_connect(window
, "delete-event", G_CALLBACK(gtk_main_quit
), NULL
);
131 g_signal_connect(gtk_builder_get_object(builder
, "areaBrowsing"),
132 "expose-event", G_CALLBACK(browsing
), NULL
);
133 g_signal_connect(gtk_builder_get_object(builder
, "optBrowsingSegment"),
134 "toggled", G_CALLBACK(browsing_segment
), NULL
);
135 g_signal_connect(gtk_builder_get_object(builder
, "optBrowsingPrimitive"),
136 "toggled", G_CALLBACK(browsing_primitive
), NULL
);
137 g_signal_connect(gtk_builder_get_object(builder
, "btnBrowsingReset"),
138 "clicked", G_CALLBACK(browsing_reset
), NULL
);
139 g_signal_connect(gtk_builder_get_object(builder
, "btnBrowsingNext"),
140 "clicked", G_CALLBACK(browsing_next
), NULL
);
141 g_signal_connect(gtk_builder_get_object(builder
, "areaArcs"),
142 "expose-event", G_CALLBACK(arcs
), NULL
);
143 g_signal_connect(gtk_builder_get_object(builder
, "areaIntersections"),
144 "expose-event", G_CALLBACK(intersections
), NULL
);
145 g_signal_connect(gtk_builder_get_object(builder
, "areaOffsetCurves"),
146 "expose-event", G_CALLBACK(offset_curves
), NULL
);
147 g_signal_connect(gtk_builder_get_object(builder
, "areaOffsetSegments"),
148 "expose-event", G_CALLBACK(offset_segments
), NULL
);
149 g_signal_connect(gtk_builder_get_object(builder
, "btnQuit"),
150 "clicked", G_CALLBACK(gtk_main_quit
), NULL
);
152 g_object_unref(builder
);
154 gtk_widget_show_all(window
);
161 /**********************************************
162 * Command line options parser
163 **********************************************/
168 g_print("cpml-demo " PACKAGE_VERSION
"\n");
173 parse_args(gint
*p_argc
, gchar
**p_argv
[])
175 GError
*error
= NULL
;
176 GOptionEntry entries
[] = {
177 {"version", 'V', G_OPTION_FLAG_NO_ARG
, G_OPTION_ARG_CALLBACK
, version
,
178 "Display version information", NULL
},
182 gtk_init_with_args(p_argc
, p_argv
, "- CPML demonstration program",
183 entries
, NULL
, &error
);
186 gint error_code
= error
->code
;
188 g_printerr("%s\n", error
->message
);
196 static cairo_path_t
*
197 duplicate_and_stroke(cairo_t
*cr
)
199 cairo_path_t
*path
= cairo_copy_path(cr
);
201 cairo_set_line_width(cr
, 2.);
208 stroke_and_destroy(cairo_t
*cr
, cairo_path_t
*path
)
210 cairo_append_path(cr
, path
);
211 cairo_path_destroy(path
);
213 cairo_set_line_width(cr
, 1.);
219 browsing(GtkWidget
*widget
, GdkEventExpose
*event
, gpointer user_data
)
224 cr
= gdk_cairo_create(widget
->window
);
226 if (browsing_data
.area
== NULL
) {
227 /* Initialize browsing_data */
228 browsing_data
.area
= widget
;
229 browsing_data
.use_segment
= TRUE
;
231 /* Append all the path samples to the cairo context */
233 cairo_translate(cr
, 270.5, -120.5);
234 for (n
= 0; n
< G_N_ELEMENTS(path_samples
); ++n
) {
236 cairo_translate(cr
, -270., 240.);
238 cairo_translate(cr
, 270., 0.);
241 (path_samples
[n
]) (cr
);
245 browsing_data
.cairo_path
= cairo_copy_path(cr
);
246 cpml_segment_from_cairo(&browsing_data
.segment
,
247 browsing_data
.cairo_path
);
248 cpml_primitive_from_segment(&browsing_data
.primitive
,
249 &browsing_data
.segment
);
251 cairo_append_path(cr
, browsing_data
.cairo_path
);
254 cairo_set_line_width(cr
, 2.);
257 cairo_set_source_rgb(cr
, 1., 0.4, 0.);
258 cairo_set_line_width(cr
, 5.);
260 if (browsing_data
.use_segment
)
261 cpml_segment_to_cairo(&browsing_data
.segment
, cr
);
263 cpml_primitive_to_cairo(&browsing_data
.primitive
, cr
);
270 browsing_segment(GtkToggleButton
*togglebutton
, gpointer user_data
)
272 if (!gtk_toggle_button_get_active(togglebutton
))
275 browsing_data
.use_segment
= TRUE
;
276 gtk_widget_queue_draw(browsing_data
.area
);
280 browsing_primitive(GtkToggleButton
*togglebutton
, gpointer user_data
)
282 if (!gtk_toggle_button_get_active(togglebutton
))
285 browsing_data
.use_segment
= FALSE
;
286 gtk_widget_queue_draw(browsing_data
.area
);
290 browsing_reset(GtkButton
*button
, gpointer user_data
)
292 if (browsing_data
.use_segment
) {
293 cpml_segment_reset(&browsing_data
.segment
);
294 cpml_primitive_from_segment(&browsing_data
.primitive
,
295 &browsing_data
.segment
);
297 cpml_primitive_reset(&browsing_data
.primitive
);
300 gtk_widget_queue_draw(browsing_data
.area
);
304 browsing_next(GtkButton
*button
, gpointer user_data
)
306 if (browsing_data
.use_segment
) {
307 cpml_segment_next(&browsing_data
.segment
);
308 cpml_primitive_from_segment(&browsing_data
.primitive
,
309 &browsing_data
.segment
);
311 cpml_primitive_next(&browsing_data
.primitive
);
314 gtk_widget_queue_draw(browsing_data
.area
);
319 arcs(GtkWidget
*widget
, GdkEventExpose
*event
, gpointer user_data
)
321 cairo_t
*cr
= gdk_cairo_create(widget
->window
);
323 cairo_translate(cr
, 100.5, 100.5);
324 arc3p(cr
, 0, 0, 0, 120, 120, 120);
326 cairo_translate(cr
, 200, 0.);
327 arc3p(cr
, 0, 0, 120, 0, 120, 120);
329 cairo_translate(cr
, 200, 0.);
330 arc3p(cr
, 60, 0, 0, 120, 120, 120);
332 cairo_translate(cr
, -400, 200);
333 arc3p(cr
, 0, 50, -2, 85, 120, 0);
335 cairo_translate(cr
, 200, 0);
336 arc3p(cr
, -2, 85, 0, 50, 120, 0);
342 arc3p(cairo_t
*cr
, double x1
, double y1
,
343 double x2
, double y2
, double x3
, double y3
)
346 cairo_path_data_t p
[4];
348 double r
, start
, end
;
354 p
[1].header
.type
= CPML_ARC
;
355 p
[1].header
.length
= 3;
364 cpml_primitive_to_cairo(&arc
, cr
);
366 cairo_set_line_width(cr
, 1.);
369 /* Add an arc generated by cairo, just for reference */
370 if (!cpml_arc_info(&arc
, ¢er
, &r
, &start
, &end
)) {
371 g_print("Unable to get arc info (%lf, %lf) (%lf, %lf) (%lf, %lf)\n",
372 x1
, y1
, x2
, y2
, x3
, y3
);
377 cairo_arc(cr
, center
.x
, center
.y
, r
-5., start
, end
);
379 cairo_arc_negative(cr
, center
.x
, center
.y
, r
-5., start
, end
);
381 /* Show the inscribed triangle */
382 cairo_move_to(cr
, x1
, y1
);
383 cairo_line_to(cr
, x2
, y2
);
384 cairo_line_to(cr
, x3
, y3
);
386 cairo_set_line_width(cr
, 0.5);
392 intersections(GtkWidget
*widget
, GdkEventExpose
*event
, gpointer user_data
)
396 CpmlSegment segment1
, segment2
;
397 CpmlPair intersection
;
399 cr
= gdk_cairo_create(widget
->window
);
400 cairo_translate(cr
, 10.5, 120.5);
404 path
= cairo_copy_path(cr
);
406 cairo_set_line_width(cr
, 1.);
409 cpml_segment_from_cairo(&segment1
, path
);
410 cpml_segment_from_cairo(&segment2
, path
);
412 while (cpml_segment_next(&segment2
)) {
413 cpml_segment_put_intersections(&segment1
, &segment2
, 1, &intersection
);
415 cairo_arc(cr
, intersection
.x
, intersection
.y
, 2.5, 0, 2 * M_PI
);
418 cpml_segment_next(&segment1
);
421 cairo_path_destroy(path
);
427 offset_curves(GtkWidget
*widget
, GdkEventExpose
*event
, gpointer user_data
)
432 cairo_path_t
*path
, *path_copy
;
434 CpmlPrimitive primitive
;
439 cr
= gdk_cairo_create(widget
->window
);
441 /* Add the Bézier curve samples */
442 for (n
= 0; n
< G_N_ELEMENTS(bezier_samples
); ++n
) {
443 bezier
= &bezier_samples
[n
][0];
445 /* The samples are arranged in a 4x? matrix of 200x150 cells */
447 cairo_translate(cr
, 25., 25.);
449 cairo_translate(cr
, -600., 150.);
451 cairo_translate(cr
, 200., 0.);
453 /* Draw the Bézier curve */
454 cairo_move_to(cr
, bezier
[0].x
, bezier
[0].y
);
455 cairo_curve_to(cr
, bezier
[1].x
, bezier
[1].y
,
456 bezier
[2].x
, bezier
[2].y
, bezier
[3].x
, bezier
[3].y
);
458 /* Create a copy, to be used after */
459 path_copy
= cairo_copy_path(cr
);
461 path
= duplicate_and_stroke(cr
);
462 cpml_segment_from_cairo(&segment
, path
);
463 cpml_segment_offset(&segment
, 20.);
464 stroke_and_destroy(cr
, path
);
466 cpml_segment_from_cairo(&segment
, path_copy
);
467 cpml_primitive_from_segment(&primitive
, &segment
);
469 /* Checking cpml_curve_put_pair_at_time and cpml_curve_put_vector_at_time */
470 cairo_set_line_width(cr
, 1.);
471 for (t
= 0; t
< 1; t
+= 0.1) {
472 cpml_curve_put_pair_at_time(&primitive
, t
, &pair
);
473 cpml_curve_put_vector_at_time(&primitive
, t
, &vector
);
474 cpml_vector_set_length(&vector
, 20.);
475 cpml_vector_normal(&vector
);
477 cairo_new_sub_path(cr
);
478 cairo_arc(cr
, pair
.x
, pair
.y
, 2.5, 0, M_PI
*2);
481 cairo_move_to(cr
, pair
.x
, pair
.y
);
482 cairo_line_to(cr
, pair
.x
+ vector
.x
, pair
.y
+ vector
.y
);
486 cairo_path_destroy(path_copy
);
494 offset_segments(GtkWidget
*widget
, GdkEventExpose
*event
, gpointer user_data
)
501 cr
= gdk_cairo_create(widget
->window
);
502 cairo_translate(cr
, 270.5, -120.5);
504 /* Offset the path samples */
505 for (n
= 0; n
< G_N_ELEMENTS(path_samples
); ++n
) {
507 cairo_translate(cr
, -270., 240.);
509 cairo_translate(cr
, 270., 0.);
512 /* Call the path callback */
513 (path_samples
[n
]) (cr
);
515 path
= duplicate_and_stroke(cr
);
516 cpml_segment_from_cairo(&segment
, path
);
517 cpml_segment_offset(&segment
, 15.);
518 stroke_and_destroy(cr
, path
);
526 circle_callback(cairo_t
*cr
)
528 cairo_new_sub_path(cr
);
529 cairo_arc(cr
, 120., 0., 100., 0., M_PI
*2);
533 piston_callback(cairo_t
*cr
)
535 cairo_path_t
*old_path
, *path
;
536 cairo_matrix_t matrix
;
539 /* Save the previous path, if any */
540 old_path
= cairo_copy_path(cr
);
543 cairo_move_to(cr
, 0., 46.5);
544 cairo_line_to(cr
, 210., 46.5);
545 cairo_line_to(cr
, 222.5, 35.);
546 cairo_line_to(cr
, 270., 35.);
547 cairo_line_to(cr
, 270., 56.);
548 cairo_line_to(cr
, 273., 59.);
549 cairo_line_to(cr
, 302., 59.);
550 cairo_line_to(cr
, 305., 56.);
551 cairo_arc(cr
, 325., 52.5, 20., G_PI
, 3. * G_PI_2
);
552 cairo_line_to(cr
, 400., 32.5);
553 cairo_line_to(cr
, 410., 22.5);
554 cairo_line_to(cr
, 450., 22.5);
555 cairo_arc_negative(cr
,
556 452., 34., 2., G_PI
, G_PI_2
);
557 cairo_line_to(cr
, 460., 36.);
558 cairo_line_to(cr
, 470., 30.);
559 cairo_line_to(cr
, 472., 12.5);
561 /* Mirror a reversed copy of the current path on the y = 0 axis */
562 path
= cairo_copy_path(cr
);
563 cpml_segment_from_cairo(&segment
, path
);
565 cpml_segment_reverse(&segment
);
566 cairo_matrix_init_scale(&matrix
, 1., -1.);
567 cpml_segment_transform(&segment
, &matrix
);
569 /* Join the mirrored path to the old path... */
570 path
->data
[0].header
.type
= CPML_LINE
;
571 cairo_append_path(cr
, path
);
572 cairo_path_destroy(path
);
574 /* ...and close the shape */
575 cairo_close_path(cr
);
577 /* Save the resulting path and clear the path memory */
578 path
= cairo_copy_path(cr
);
581 /* Restore the previous path and reappend the new path */
582 cairo_append_path(cr
, old_path
);
583 cairo_path_destroy(old_path
);
584 cairo_append_path(cr
, path
);
585 cairo_path_destroy(path
);
589 curve1_callback(cairo_t
*cr
)
591 cairo_move_to(cr
, 30., 0.);
592 cairo_curve_to(cr
, 120., 120., 180., 100., 180., 20.);
593 cairo_curve_to(cr
, 180., -20., 50., 40., 150., 40.);
594 cairo_curve_to(cr
, 220., 40., 190., -60., 150., -60.);
595 cairo_curve_to(cr
, 100., -60., 80., -40., 60., -60.);
599 line1_callback(cairo_t
*cr
)
601 cairo_move_to(cr
, 0, -50);
602 cairo_line_to(cr
, 100, 50);
604 cairo_move_to(cr
, 100, -50);
605 cairo_line_to(cr
, 0, 50);
607 cairo_move_to(cr
, 120, -50);
608 cairo_line_to(cr
, 200, -10);
610 cairo_move_to(cr
, 120, 50);
611 cairo_line_to(cr
, 200, 10);
613 cairo_move_to(cr
, 220, 0);
614 cairo_line_to(cr
, 280, 0);
616 cairo_move_to(cr
, 270, -40);
617 cairo_line_to(cr
, 270, 20);
619 cairo_move_to(cr
, 320, 60);
620 cairo_line_to(cr
, 380, 60);
622 cairo_move_to(cr
, 300, -40);
623 cairo_line_to(cr
, 340, 0);
625 cairo_move_to(cr
, 480, 10);
626 cairo_line_to(cr
, 400, 40);
628 cairo_move_to(cr
, 400, 40);
629 cairo_line_to(cr
, 450, -40);