diff options
Diffstat (limited to 'examples')
| -rw-r--r-- | examples/julia_set.c | 33 |
1 files changed, 26 insertions, 7 deletions
diff --git a/examples/julia_set.c b/examples/julia_set.c index 6ae8e6f..e819ca5 100644 --- a/examples/julia_set.c +++ b/examples/julia_set.c @@ -1,5 +1,7 @@ #include "../graphics.c" +#define SCALE_LIMIT (0.9) + f64 view_x = 0.; f64 view_y = 0.; f64 view_s = 1.; @@ -9,6 +11,28 @@ f64 radius = 2.; i64 limit = 1024; i64 time_0; +void apply_scale(f64 delta) { + while (delta > SCALE_LIMIT) { + apply_scale(SCALE_LIMIT); + delta -= SCALE_LIMIT; + } + while (delta < -SCALE_LIMIT) { + apply_scale(-SCALE_LIMIT); + delta += SCALE_LIMIT; + } + + f64 ds = view_s * delta * .1; + if (view_s + ds < EPSILON) + return; + f64 dx = (g_platform.cursor_x * 1. - g_platform.real_width * .5); + f64 dy = (g_platform.cursor_y * 1. - g_platform.real_height * .5); + view_x -= view_s * dx; + view_y -= view_s * dy; + view_s += ds; + view_x += view_s * dx; + view_y += view_s * dy; +} + void update_and_render_frame(void) { i32 num_events = p_handle_events(); @@ -44,13 +68,8 @@ void update_and_render_frame(void) { } if (g_platform.wheel_dy != 0.) { - f64 dx = (g_platform.cursor_x * 1. - g_platform.real_width * .5); - f64 dy = (g_platform.cursor_y * 1. - g_platform.real_height * .5); - view_x -= view_s * dx; - view_y -= view_s * dy; - view_s += view_s * g_platform.wheel_dy * .1; - view_x += view_s * dx; - view_y += view_s * dy; + apply_scale(g_platform.wheel_dy / 2.0); + apply_scale(g_platform.wheel_dy / 2.0); } for (i32 j = 0; j < g_platform.frame_height; ++j) |