void
twin_path_arc (twin_path_t *path,
twin_fixed_t x,
twin_fixed_t y,
twin_fixed_t x_radius,
twin_fixed_t y_radius,
twin_angle_t start,
twin_angle_t extent)
{
twin_matrix_t save = twin_path_current_matrix (path);
twin_fixed_t max_radius;
int32_t sides;
int32_t n;
twin_angle_t a;
twin_angle_t first, last, step, inc;
twin_angle_t epsilon;
twin_path_translate (path, x, y);
twin_path_scale (path, x_radius, y_radius);
max_radius = _twin_matrix_max_radius (&path->state.matrix);
sides = max_radius / twin_sfixed_to_fixed (TWIN_SFIXED_TOLERANCE);
if (sides > 1024) sides = 1024;
n = 2;
while ((1 << n) < sides)
n++;
sides = (1 << n);
step = TWIN_ANGLE_360 >> n;
inc = step;
epsilon = 1;
if (extent < 0)
{
inc = -inc;
epsilon = -1;
}
first = (start + inc - epsilon) & ~(step - 1);
last = (start + extent - inc + epsilon) & ~(step - 1);
if (first != start)
twin_path_draw (path, twin_cos(start), twin_sin(start));
for (a = first; a != last; a += inc)
twin_path_draw (path, twin_cos (a), twin_sin (a));
if (last != start + extent)
twin_path_draw (path, twin_cos (start+extent), twin_sin(start+extent));
twin_path_set_matrix (path, save);
}
static void
twin_clock_set_transform (twin_clock_t *clock,
twin_path_t *path)
{
twin_fixed_t scale;
scale = (TWIN_FIXED_ONE - TWIN_CLOCK_BORDER_WIDTH * 3) / 2;
twin_path_scale (path, _twin_widget_width (clock) * scale,
_twin_widget_height (clock) * scale);
twin_path_translate (path,
TWIN_FIXED_ONE + TWIN_CLOCK_BORDER_WIDTH * 3,
TWIN_FIXED_ONE + TWIN_CLOCK_BORDER_WIDTH * 3);
twin_path_rotate (path, -TWIN_ANGLE_90);
}
void
twin_demo_start (twin_screen_t *screen, const char *name, int x, int y, int w, int h)
{
#if 0
twin_circletext_start (screen, x, y, w, h);
#endif
twin_line_start (screen, x += 20, y += 20, w, h);
#if 0
twin_quickbrown_start (screen, x += 20, y += 20, w, h);
twin_ascii_start (screen, x += 20, y += 20, w, h);
twin_jelly_start (screen, x += 20, y += 20, w, h);
#endif
#if 0
#if 0
path = twin_path_create ();
twin_path_rotate (path, -TWIN_ANGLE_45);
twin_path_translate (path, D(10), D(2));
for (s = 0; s < 40; s++)
{
twin_path_rotate (path, TWIN_ANGLE_11_25 / 16);
twin_path_scale (path, D(1.125), D(1.125));
twin_path_move (path, D(0), D(0));
twin_path_draw (path, D(1), D(0));
twin_path_draw (path, D(1), D(1));
twin_path_draw (path, D(0), D(1));
}
twin_fill (alpha, 0x00000000, TWIN_SOURCE, 0, 0, w, h);
twin_fill_path (alpha, path);
source.source_kind = TWIN_SOLID;
source.u.argb = 0xffff0000;
mask.source_kind = TWIN_PIXMAP;
mask.u.pixmap = alpha;
twin_composite (red, 0, 0, &source, 0, 0, &mask, 0, 0, TWIN_OVER,
w, h);
#endif
#if 0
path = twin_path_create ();
stroke = twin_path_create ();
twin_path_translate (stroke, D(62), D(62));
twin_path_scale (stroke,D(60),D(60));
for (s = 0; s < 60; s++)
{
twin_state_t save = twin_path_save (stroke);
twin_angle_t a = s * TWIN_ANGLE_90 / 15;
twin_path_rotate (stroke, a);
twin_path_move (stroke, D(1), 0);
if (s % 5 == 0)
twin_path_draw (stroke, D(0.85), 0);
else
twin_path_draw (stroke, D(.98), 0);
twin_path_restore (stroke, &save);
}
twin_path_convolve (path, stroke, pen);
twin_fill (alpha, 0x00000000, TWIN_SOURCE, 0, 0, w, h);
twin_fill_path (alpha, path);
source.source_kind = TWIN_SOLID;
source.u.argb = 0xffff0000;
mask.source_kind = TWIN_PIXMAP;
mask.u.pixmap = alpha;
twin_composite (red, 0, 0, &source, 0, 0, &mask, 0, 0, TWIN_OVER,
w, h);
#endif
#if 0
path = twin_path_create ();
stroke = twin_path_create ();
twin_path_translate (stroke, D(100), D(100));
twin_path_scale (stroke, D(10), D(10));
twin_path_move (stroke, D(0), D(0));
twin_path_draw (stroke, D(10), D(0));
twin_path_convolve (path, stroke, pen);
twin_fill (alpha, 0x00000000, TWIN_SOURCE, 0, 0, w, h);
twin_fill_path (alpha, path);
source.source_kind = TWIN_SOLID;
source.u.argb = 0xffff0000;
mask.source_kind = TWIN_PIXMAP;
mask.u.pixmap = alpha;
twin_composite (red, 0, 0, &source, 0, 0, &mask, 0, 0, TWIN_OVER,
w, h);
#endif
#if 1
path = twin_path_create ();
stroke = twin_path_create ();
twin_path_move (stroke, D (10), D (40));
twin_path_draw (stroke, D (40), D (40));
twin_path_draw (stroke, D (10), D (10));
twin_path_move (stroke, D (10), D (50));
twin_path_draw (stroke, D (40), D (50));
twin_path_convolve (path, stroke, pen);
twin_path_destroy (stroke);
twin_fill (alpha, 0x00000000, TWIN_SOURCE, 0, 0, w, h);
twin_fill_path (alpha, path, 0, 0);
source.source_kind = TWIN_SOLID;
source.u.argb = 0xff00ff00;
mask.source_kind = TWIN_PIXMAP;
mask.u.pixmap = alpha;
twin_composite (blue, 0, 0, &source, 0, 0, &mask, 0, 0, TWIN_OVER,
100, 100);
twin_path_destroy (path);
path = twin_path_create ();
stroke = twin_path_create ();
twin_path_move (stroke, D (50), D (50));
twin_path_curve (stroke, D (70), D (70), D (80), D (70), D (100), D (50));
twin_fill (alpha, 0x00000000, TWIN_SOURCE, 0, 0, w, h);
twin_fill_path (alpha, stroke, 0, 0);
source.source_kind = TWIN_SOLID;
source.u.argb = 0xffff0000;
mask.source_kind = TWIN_PIXMAP;
mask.u.pixmap = alpha;
twin_composite (blue, 0, 0, &source, 0, 0, &mask, 0, 0, TWIN_OVER,
100, 100);
twin_path_convolve (path, stroke, pen);
twin_fill (alpha, 0x00000000, TWIN_SOURCE, 0, 0, w, h);
twin_fill_path (alpha, path, 0, 0);
source.source_kind = TWIN_SOLID;
source.u.argb = 0xff0000ff;
mask.source_kind = TWIN_PIXMAP;
mask.u.pixmap = alpha;
twin_composite (blue, 0, 0, &source, 0, 0, &mask, 0, 0, TWIN_OVER,
100, 100);
#endif
twin_window_show (redw);
twin_window_show (bluew);
#endif
}
