Commit 0fa8132c6bbfa894e761e14c5ab57063ed34510e
2023-11-18T14:55:37
cairo demo with gradients
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diff --git a/libc3/window/cairo/c3_window_cairo_demo.c b/libc3/window/cairo/c3_window_cairo_demo.c
index 94ecb7a..ce2cd0e 100644
--- a/libc3/window/cairo/c3_window_cairo_demo.c
+++ b/libc3/window/cairo/c3_window_cairo_demo.c
@@ -11,6 +11,7 @@
* THIS SOFTWARE.
*/
#include <assert.h>
+#include <math.h>
#include <stdio.h>
#include <time.h>
#include <libc3/c3.h>
@@ -81,33 +82,18 @@ bool c3_window_cairo_demo_render (s_window_cairo *window,
/* background */
switch (window->sequence_pos) {
case 0:
- if (seq->t < 1.0)
- cairo_set_source_rgb(cr, 1, 1, 1);
- else if (seq->t < 2.0)
- cairo_set_source_rgb(cr, 1, 0, 0);
- else if (seq->t < 3.0)
- cairo_set_source_rgb(cr, 1, 1, 0);
- else if (seq->t < 4.0)
- cairo_set_source_rgb(cr, 0, 1, 0);
- else if (seq->t < 5.0)
- cairo_set_source_rgb(cr, 0, 1, 1);
- else if (seq->t < 6.0)
- cairo_set_source_rgb(cr, 0, 0, 1);
- else if (seq->t < 7.0)
- cairo_set_source_rgb(cr, 1, 0, 1);
- else
- cairo_set_source_rgb(cr, 0, 0, 0);
+ c3_window_cairo_demo_render_bg_rect(window, cr, seq);
break;
default:
cairo_set_source_rgb(cr, 1, 1, 1);
+ cairo_rectangle(cr, 0, 0, window->w, window->h);
+ cairo_fill(cr);
}
- cairo_rectangle(cr, 0, 0, window->w, window->h);
- cairo_fill(cr);
/* text */
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
+ cairo_set_font_size (cr, 20);
cairo_select_font_face (cr, "CourierNew",
CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
- cairo_set_font_size (cr, 20);
cairo_text_extents (cr, seq->title, &te);
cairo_move_to (cr, 20, window->h - te.height - te.y_bearing - 20);
cairo_show_text (cr, seq->title);
@@ -119,6 +105,38 @@ bool c3_window_cairo_demo_render (s_window_cairo *window,
return true;
}
+void c3_window_cairo_demo_render_bg_rect (s_window_cairo *window,
+ cairo_t *cr,
+ s_sequence *seq)
+{
+#define C3_WINDOW_CAIRO_DEMO_BG_RECT_COLOR_MAX 8
+ const s_rgb color[C3_WINDOW_CAIRO_DEMO_BG_RECT_COLOR_MAX] = {
+ {1, 1, 1},
+ {1, 0, 0},
+ {1, 1, 0},
+ {0, 1, 0},
+ {0, 1, 1},
+ {0, 0, 1},
+ {1, 0, 1},
+ {0, 0, 0}
+ };
+ u8 c1;
+ u8 c2;
+ double p;
+ double q;
+ s_rgb rgb;
+ c1 = (u8) trunc(seq->t) % C3_WINDOW_CAIRO_DEMO_BG_RECT_COLOR_MAX;
+ c2 = (u8) trunc(seq->t + 1.0) % C3_WINDOW_CAIRO_DEMO_BG_RECT_COLOR_MAX;
+ p = fmod(seq->t, 1.0);
+ q = 1.0 - p;
+ rgb.r = color[c1].r * q + color[c2].r * p;
+ rgb.g = color[c1].g * q + color[c2].g * p;
+ rgb.b = color[c1].b * q + color[c2].b * p;
+ cairo_set_source_rgb(cr, rgb.r, rgb.g, rgb.b);
+ cairo_rectangle(cr, 0, 0, window->w, window->h);
+ cairo_fill(cr);
+}
+
bool c3_window_cairo_demo_resize (s_window_cairo *window,
uw w, uw h)
{
diff --git a/libc3/window/cairo/c3_window_cairo_demo.h b/libc3/window/cairo/c3_window_cairo_demo.h
index a36870b..6b1d25b 100644
--- a/libc3/window/cairo/c3_window_cairo_demo.h
+++ b/libc3/window/cairo/c3_window_cairo_demo.h
@@ -23,6 +23,9 @@ bool c3_window_cairo_demo_button (s_window_cairo *window, u8 button,
bool c3_window_cairo_demo_key (s_window_cairo *window, uw keysym);
bool c3_window_cairo_demo_load (s_window_cairo *window);
bool c3_window_cairo_demo_render (s_window_cairo *window, cairo_t *cr);
+void c3_window_cairo_demo_render_bg_rect (s_window_cairo *window,
+ cairo_t *cr,
+ s_sequence *seq);
bool c3_window_cairo_demo_resize (s_window_cairo *window, uw w, uw h);
#endif /* LIBC3_WINDOW_CAIRO_DEMO_H */
diff --git a/libc3/window/cairo/types.h b/libc3/window/cairo/types.h
index d85f85f..11c7629 100644
--- a/libc3/window/cairo/types.h
+++ b/libc3/window/cairo/types.h
@@ -22,6 +22,8 @@
#include <libc3/types.h>
#include "../types.h"
+typedef struct rgb s_rgb;
+typedef struct rgba s_rgba;
typedef struct window_cairo s_window_cairo;
/* return false to break event loop */
@@ -46,6 +48,19 @@ typedef bool (*f_window_cairo_render) (s_window_cairo *window,
typedef bool (*f_window_cairo_resize) (s_window_cairo *window,
uw w, uw h);
+struct rgb {
+ double r;
+ double g;
+ double b;
+};
+
+struct rgba {
+ double r;
+ double g;
+ double b;
+ double a;
+};
+
/* Subtype of s_window. See libc3/window/types.h */
struct window_cairo {
sw x;