6 static void parse_args (gint
*p_argc
,
9 duplicate_and_stroke (cairo_t
*cr
);
10 static void stroke_and_destroy (cairo_t
*cr
,
13 static void browsing (GtkWidget
*widget
,
14 GdkEventExpose
*event
,
16 static void browsing_segment (GtkToggleButton
*togglebutton
,
18 static void browsing_primitive (GtkToggleButton
*togglebutton
,
20 static void browsing_reset (GtkButton
*button
,
22 static void browsing_next (GtkButton
*button
,
25 static void arcs (GtkWidget
*widget
,
26 GdkEventExpose
*event
,
28 static void arc3p (cairo_t
*cr
,
36 static void intersections (GtkWidget
*widget
,
37 GdkEventExpose
*event
,
40 static void offset_curves (GtkWidget
*widget
,
41 GdkEventExpose
*event
,
44 static void offset_segments (GtkWidget
*widget
,
45 GdkEventExpose
*event
,
48 static void circle_callback (cairo_t
*cr
);
49 static void piston_callback (cairo_t
*cr
);
50 static void curve1_callback (cairo_t
*cr
);
51 static void line1_callback (cairo_t
*cr
);
55 cairo_path_t
*cairo_path
;
58 CpmlPrimitive primitive
;
63 static CpmlPair bezier_samples
[][4] = {
64 { { 0, 0 }, { 0, 40 }, { 120, 40 }, { 120, 0 } }, /* Simmetric low */
65 { { 40, 0 }, { 40, 160 }, { 80, 160 }, { 80, 0 } }, /* Simmetric high */
66 { { 0, 0 }, { 33.1371, 33.1371 }, { 86.8629, 33.1371 }, { 120, 0 } },
67 /* Arc approximation */
68 { { 0, 0 }, { 70, 120 }, { 50, 120 }, { 120, 0 } }, /* Twisted controls */
70 { { 0, 0 }, { 0, 120 }, { 60, 120 }, { 120, 0 } }, /* Vertical p1-p2 */
71 { { 0, 0 }, { 60, 120 }, { 120, 120 }, { 120, 0 } },/* Vertical p3-p4 */
72 { { 0, 120 }, { 120, 120 }, { 120, 60 }, { 0, 0 } },/* Horizontal p1-p2 */
73 { { 0, 120 }, { 120, 60 }, { 120, 0 }, { 0, 0 } }, /* Horizontal p3-p4 */
75 { { 0, 0 }, { 0, 120 }, { 120, 120 }, { 120, 0 } }, /* Down */
76 { { 0, 120 }, { 120, 120 }, { 120, 0 }, { 0, 0 } }, /* Right */
77 { { 0, 120 }, { 0, 0 }, { 120, 0 }, { 120, 120 } }, /* Up */
78 { { 120, 120 }, { 0, 120 }, { 0, 0 }, { 120, 0 } }, /* Left */
80 { { 0, 60 }, { 60, 120 }, { 120, 60 }, { 60, 0 } }, /* Down-right */
81 { { 60, 120 }, { 120, 60 }, { 60, 0 }, { 0, 60 } }, /* Up-right */
82 { { 120, 60 }, { 60, 0 }, { 0, 60 }, { 60, 120 } }, /* Up-left */
83 { { 60, 0 }, { 0, 60 }, { 60, 120 }, { 120, 60 } }, /* Down-left*/
85 { { 0, 0 }, { 60, 0 }, { 60, 120 }, { 120, 120 } }, /* Step left */
86 { { 120, 0 }, { 60, 0 }, { 60, 120 }, { 0, 120 } }, /* Step right */
87 { { 0, 0 }, { 60, 90 }, { 90, 120 }, { 120, 90 } }, /* Unbalanced opened */
88 { { 0, 0 }, { 40, 120 }, { 120, 120 }, { 60, 80 } } /* Unbalanced closed */
91 static void (*path_samples
[]) (cairo_t
*cr
) = {
100 main(gint argc
, gchar
**argv
)
107 parse_args(&argc
, &argv
);
109 path
= demo_find_data_file("cpml-demo.ui");
111 g_print("cpml-demo.ui not found!\n");
115 builder
= gtk_builder_new();
118 gtk_builder_add_from_file(builder
, path
, &error
);
120 g_print("%s\n", error
->message
);
124 window
= (GtkWidget
*) gtk_builder_get_object(builder
, "wndMain");
126 /* Connect signals */
127 g_signal_connect(window
, "delete-event", G_CALLBACK(gtk_main_quit
), NULL
);
128 g_signal_connect(gtk_builder_get_object(builder
, "areaBrowsing"),
129 "expose-event", G_CALLBACK(browsing
), NULL
);
130 g_signal_connect(gtk_builder_get_object(builder
, "optBrowsingSegment"),
131 "toggled", G_CALLBACK(browsing_segment
), NULL
);
132 g_signal_connect(gtk_builder_get_object(builder
, "optBrowsingPrimitive"),
133 "toggled", G_CALLBACK(browsing_primitive
), NULL
);
134 g_signal_connect(gtk_builder_get_object(builder
, "btnBrowsingReset"),
135 "clicked", G_CALLBACK(browsing_reset
), NULL
);
136 g_signal_connect(gtk_builder_get_object(builder
, "btnBrowsingNext"),
137 "clicked", G_CALLBACK(browsing_next
), NULL
);
138 g_signal_connect(gtk_builder_get_object(builder
, "areaArcs"),
139 "expose-event", G_CALLBACK(arcs
), NULL
);
140 g_signal_connect(gtk_builder_get_object(builder
, "areaIntersections"),
141 "expose-event", G_CALLBACK(intersections
), NULL
);
142 g_signal_connect(gtk_builder_get_object(builder
, "areaOffsetCurves"),
143 "expose-event", G_CALLBACK(offset_curves
), NULL
);
144 g_signal_connect(gtk_builder_get_object(builder
, "areaOffsetSegments"),
145 "expose-event", G_CALLBACK(offset_segments
), NULL
);
146 g_signal_connect(gtk_builder_get_object(builder
, "btnQuit"),
147 "clicked", G_CALLBACK(gtk_main_quit
), NULL
);
149 g_object_unref(builder
);
151 gtk_widget_show_all(window
);
158 /**********************************************
159 * Command line options parser
160 **********************************************/
165 g_print("cpml-demo " PACKAGE_VERSION
"\n");
170 parse_args(gint
*p_argc
, gchar
**p_argv
[])
172 GError
*error
= NULL
;
173 GOptionEntry entries
[] = {
174 {"version", 'V', G_OPTION_FLAG_NO_ARG
, G_OPTION_ARG_CALLBACK
, version
,
175 "Display version information", NULL
},
179 gtk_init_with_args(p_argc
, p_argv
, "- CPML demonstration program",
180 entries
, NULL
, &error
);
183 gint error_code
= error
->code
;
185 g_printerr("%s\n", error
->message
);
193 static cairo_path_t
*
194 duplicate_and_stroke(cairo_t
*cr
)
196 cairo_path_t
*path
= cairo_copy_path(cr
);
198 cairo_set_line_width(cr
, 2.);
205 stroke_and_destroy(cairo_t
*cr
, cairo_path_t
*path
)
207 cairo_append_path(cr
, path
);
208 cairo_path_destroy(path
);
210 cairo_set_line_width(cr
, 1.);
216 browsing(GtkWidget
*widget
, GdkEventExpose
*event
, gpointer user_data
)
221 cr
= gdk_cairo_create(widget
->window
);
223 if (browsing_data
.area
== NULL
) {
224 /* Initialize browsing_data */
225 browsing_data
.area
= widget
;
226 browsing_data
.use_segment
= TRUE
;
228 /* Append all the path samples to the cairo context */
230 cairo_translate(cr
, 270.5, -120.5);
231 for (n
= 0; n
< G_N_ELEMENTS(path_samples
); ++n
) {
233 cairo_translate(cr
, -270., 240.);
235 cairo_translate(cr
, 270., 0.);
238 (path_samples
[n
]) (cr
);
242 browsing_data
.cairo_path
= cairo_copy_path(cr
);
243 cpml_segment_from_cairo(&browsing_data
.segment
,
244 browsing_data
.cairo_path
);
245 cpml_primitive_from_segment(&browsing_data
.primitive
,
246 &browsing_data
.segment
);
248 cairo_append_path(cr
, browsing_data
.cairo_path
);
251 cairo_set_line_width(cr
, 2.);
254 cairo_set_source_rgb(cr
, 1., 0.4, 0.);
255 cairo_set_line_width(cr
, 5.);
257 if (browsing_data
.use_segment
)
258 cpml_segment_to_cairo(&browsing_data
.segment
, cr
);
260 cpml_primitive_to_cairo(&browsing_data
.primitive
, cr
);
267 browsing_segment(GtkToggleButton
*togglebutton
, gpointer user_data
)
269 if (!gtk_toggle_button_get_active(togglebutton
))
272 browsing_data
.use_segment
= TRUE
;
273 gtk_widget_queue_draw(browsing_data
.area
);
277 browsing_primitive(GtkToggleButton
*togglebutton
, gpointer user_data
)
279 if (!gtk_toggle_button_get_active(togglebutton
))
282 browsing_data
.use_segment
= FALSE
;
283 gtk_widget_queue_draw(browsing_data
.area
);
287 browsing_reset(GtkButton
*button
, gpointer user_data
)
289 if (browsing_data
.use_segment
) {
290 cpml_segment_reset(&browsing_data
.segment
);
291 cpml_primitive_from_segment(&browsing_data
.primitive
,
292 &browsing_data
.segment
);
294 cpml_primitive_reset(&browsing_data
.primitive
);
297 gtk_widget_queue_draw(browsing_data
.area
);
301 browsing_next(GtkButton
*button
, gpointer user_data
)
303 if (browsing_data
.use_segment
) {
304 cpml_segment_next(&browsing_data
.segment
);
305 cpml_primitive_from_segment(&browsing_data
.primitive
,
306 &browsing_data
.segment
);
308 cpml_primitive_next(&browsing_data
.primitive
);
311 gtk_widget_queue_draw(browsing_data
.area
);
316 arcs(GtkWidget
*widget
, GdkEventExpose
*event
, gpointer user_data
)
318 cairo_t
*cr
= gdk_cairo_create(widget
->window
);
320 cairo_translate(cr
, 100.5, 100.5);
321 arc3p(cr
, 0, 0, 0, 120, 120, 120);
323 cairo_translate(cr
, 200, 0.);
324 arc3p(cr
, 0, 0, 120, 0, 120, 120);
326 cairo_translate(cr
, 200, 0.);
327 arc3p(cr
, 60, 0, 0, 120, 120, 120);
329 cairo_translate(cr
, -400, 200);
330 arc3p(cr
, 0, 50, -2, 85, 120, 0);
332 cairo_translate(cr
, 200, 0);
333 arc3p(cr
, -2, 85, 0, 50, 120, 0);
339 arc3p(cairo_t
*cr
, double x1
, double y1
,
340 double x2
, double y2
, double x3
, double y3
)
343 cairo_path_data_t p
[4];
345 double r
, start
, end
;
351 p
[1].header
.type
= CPML_ARC
;
352 p
[1].header
.length
= 3;
361 cpml_primitive_to_cairo(&arc
, cr
);
363 cairo_set_line_width(cr
, 1.);
366 /* Add an arc generated by cairo, just for reference */
367 if (!cpml_arc_info(&arc
, ¢er
, &r
, &start
, &end
)) {
368 g_print("Unable to get arc info (%lf, %lf) (%lf, %lf) (%lf, %lf)\n",
369 x1
, y1
, x2
, y2
, x3
, y3
);
374 cairo_arc(cr
, center
.x
, center
.y
, r
-5., start
, end
);
376 cairo_arc_negative(cr
, center
.x
, center
.y
, r
-5., start
, end
);
378 /* Show the inscribed triangle */
379 cairo_move_to(cr
, x1
, y1
);
380 cairo_line_to(cr
, x2
, y2
);
381 cairo_line_to(cr
, x3
, y3
);
383 cairo_set_line_width(cr
, 0.5);
389 intersections(GtkWidget
*widget
, GdkEventExpose
*event
, gpointer user_data
)
393 CpmlSegment segment1
, segment2
;
394 CpmlPair intersection
;
396 cr
= gdk_cairo_create(widget
->window
);
397 cairo_translate(cr
, 10.5, 120.5);
401 path
= cairo_copy_path(cr
);
403 cairo_set_line_width(cr
, 1.);
406 cpml_segment_from_cairo(&segment1
, path
);
407 cpml_segment_from_cairo(&segment2
, path
);
409 while (cpml_segment_next(&segment2
)) {
410 cpml_segment_put_intersections(&segment1
, &segment2
, 1, &intersection
);
412 cairo_arc(cr
, intersection
.x
, intersection
.y
, 2.5, 0, 2 * M_PI
);
415 cpml_segment_next(&segment1
);
418 cairo_path_destroy(path
);
424 offset_curves(GtkWidget
*widget
, GdkEventExpose
*event
, gpointer user_data
)
429 cairo_path_t
*path
, *path_copy
;
431 CpmlPrimitive primitive
;
436 cr
= gdk_cairo_create(widget
->window
);
438 /* Add the Bézier curve samples */
439 for (n
= 0; n
< G_N_ELEMENTS(bezier_samples
); ++n
) {
440 bezier
= &bezier_samples
[n
][0];
442 /* The samples are arranged in a 4x? matrix of 200x150 cells */
444 cairo_translate(cr
, 25., 25.);
446 cairo_translate(cr
, -600., 150.);
448 cairo_translate(cr
, 200., 0.);
450 /* Draw the Bézier curve */
451 cairo_move_to(cr
, bezier
[0].x
, bezier
[0].y
);
452 cairo_curve_to(cr
, bezier
[1].x
, bezier
[1].y
,
453 bezier
[2].x
, bezier
[2].y
, bezier
[3].x
, bezier
[3].y
);
455 /* Create a copy, to be used after */
456 path_copy
= cairo_copy_path(cr
);
458 path
= duplicate_and_stroke(cr
);
459 cpml_segment_from_cairo(&segment
, path
);
460 cpml_segment_offset(&segment
, 20.);
461 stroke_and_destroy(cr
, path
);
463 cpml_segment_from_cairo(&segment
, path_copy
);
464 cpml_primitive_from_segment(&primitive
, &segment
);
466 /* Checking cpml_curve_put_pair_at_time and cpml_curve_put_vector_at_time */
467 cairo_set_line_width(cr
, 1.);
468 for (t
= 0; t
< 1; t
+= 0.1) {
469 cpml_curve_put_pair_at_time(&primitive
, t
, &pair
);
470 cpml_curve_put_vector_at_time(&primitive
, t
, &vector
);
471 cpml_vector_set_length(&vector
, 20.);
472 cpml_vector_normal(&vector
);
474 cairo_new_sub_path(cr
);
475 cairo_arc(cr
, pair
.x
, pair
.y
, 2.5, 0, M_PI
*2);
478 cairo_move_to(cr
, pair
.x
, pair
.y
);
479 cairo_line_to(cr
, pair
.x
+ vector
.x
, pair
.y
+ vector
.y
);
483 cairo_path_destroy(path_copy
);
491 offset_segments(GtkWidget
*widget
, GdkEventExpose
*event
, gpointer user_data
)
498 cr
= gdk_cairo_create(widget
->window
);
499 cairo_translate(cr
, 270.5, -120.5);
501 /* Offset the path samples */
502 for (n
= 0; n
< G_N_ELEMENTS(path_samples
); ++n
) {
504 cairo_translate(cr
, -270., 240.);
506 cairo_translate(cr
, 270., 0.);
509 /* Call the path callback */
510 (path_samples
[n
]) (cr
);
512 path
= duplicate_and_stroke(cr
);
513 cpml_segment_from_cairo(&segment
, path
);
514 cpml_segment_offset(&segment
, 15.);
515 stroke_and_destroy(cr
, path
);
523 circle_callback(cairo_t
*cr
)
525 cairo_new_sub_path(cr
);
526 cairo_arc(cr
, 120., 0., 100., 0., M_PI
*2);
530 piston_callback(cairo_t
*cr
)
532 cairo_path_t
*old_path
, *path
;
533 cairo_matrix_t matrix
;
536 /* Save the previous path, if any */
537 old_path
= cairo_copy_path(cr
);
540 cairo_move_to(cr
, 0., 46.5);
541 cairo_line_to(cr
, 210., 46.5);
542 cairo_line_to(cr
, 222.5, 35.);
543 cairo_line_to(cr
, 270., 35.);
544 cairo_line_to(cr
, 270., 56.);
545 cairo_line_to(cr
, 273., 59.);
546 cairo_line_to(cr
, 302., 59.);
547 cairo_line_to(cr
, 305., 56.);
548 cairo_arc(cr
, 325., 52.5, 20., G_PI
, 3. * G_PI_2
);
549 cairo_line_to(cr
, 400., 32.5);
550 cairo_line_to(cr
, 410., 22.5);
551 cairo_line_to(cr
, 450., 22.5);
552 cairo_arc_negative(cr
,
553 452., 34., 2., G_PI
, G_PI_2
);
554 cairo_line_to(cr
, 460., 36.);
555 cairo_line_to(cr
, 470., 30.);
556 cairo_line_to(cr
, 472., 12.5);
558 /* Mirror a reversed copy of the current path on the y = 0 axis */
559 path
= cairo_copy_path(cr
);
560 cpml_segment_from_cairo(&segment
, path
);
562 cpml_segment_reverse(&segment
);
563 cairo_matrix_init_scale(&matrix
, 1., -1.);
564 cpml_segment_transform(&segment
, &matrix
);
566 /* Join the mirrored path to the old path... */
567 path
->data
[0].header
.type
= CPML_LINE
;
568 cairo_append_path(cr
, path
);
569 cairo_path_destroy(path
);
571 /* ...and close the shape */
572 cairo_close_path(cr
);
574 /* Save the resulting path and clear the path memory */
575 path
= cairo_copy_path(cr
);
578 /* Restore the previous path and reappend the new path */
579 cairo_append_path(cr
, old_path
);
580 cairo_path_destroy(old_path
);
581 cairo_append_path(cr
, path
);
582 cairo_path_destroy(path
);
586 curve1_callback(cairo_t
*cr
)
588 cairo_move_to(cr
, 30., 0.);
589 cairo_curve_to(cr
, 120., 120., 180., 100., 180., 20.);
590 cairo_curve_to(cr
, 180., -20., 50., 40., 150., 40.);
591 cairo_curve_to(cr
, 220., 40., 190., -60., 150., -60.);
592 cairo_curve_to(cr
, 100., -60., 80., -40., 60., -60.);
596 line1_callback(cairo_t
*cr
)
598 cairo_move_to(cr
, 0, -50);
599 cairo_line_to(cr
, 100, 50);
601 cairo_move_to(cr
, 100, -50);
602 cairo_line_to(cr
, 0, 50);
604 cairo_move_to(cr
, 120, -50);
605 cairo_line_to(cr
, 200, -10);
607 cairo_move_to(cr
, 120, 50);
608 cairo_line_to(cr
, 200, 10);
610 cairo_move_to(cr
, 220, 0);
611 cairo_line_to(cr
, 280, 0);
613 cairo_move_to(cr
, 270, -40);
614 cairo_line_to(cr
, 270, 20);
616 cairo_move_to(cr
, 320, 60);
617 cairo_line_to(cr
, 380, 60);
619 cairo_move_to(cr
, 300, -40);
620 cairo_line_to(cr
, 340, 0);
622 cairo_move_to(cr
, 480, 10);
623 cairo_line_to(cr
, 400, 40);
625 cairo_move_to(cr
, 400, 40);
626 cairo_line_to(cr
, 450, -40);