src/ui/wiggly_text.c

   1 #include <SDL.h>
   2
   3 #include "math/vec.h"
   4
   5 #include "./wiggly_text.h"
   6 #include "system/lt.h"
   7 #include "system/stacktrace.h"
   8 #include "system/nth_alloc.h"
   9 #include "system/str.h"
  10 #include "game/camera.h"
  11
  12 void wiggly_text_render(const WigglyText *wiggly_text,
  13                         const Camera *camera,
  14                         Vec2f position)
  15 {
  16     trace_assert(wiggly_text);
  17     trace_assert(camera);
  18
  19     const size_t n = strlen(wiggly_text->text);
  20     char buf[2] = {0, 0};
  21
  22     for (size_t i = 0; i < n; ++i) {
  23         buf[0] = wiggly_text->text[i];
  24
  25         camera_render_text_screen(
  26             camera,
  27             buf,
  28             wiggly_text->scale,
  29             wiggly_text->color,
  30             vec_sum(
  31                 position,
  32                 vec(
  33                     (float) (i * FONT_CHAR_WIDTH) * wiggly_text->scale.x,
  34                     sinf(wiggly_text->angle + (float) i / (float) n * 10.0f) * 20.0f)));
  35     }
  36 }
  37
  38 int wiggly_text_update(WigglyText *wiggly_text, float delta_time)
  39 {
  40     trace_assert(wiggly_text);
  41     wiggly_text->angle = fmodf(wiggly_text->angle + 10.0f * delta_time, 2 * PI);
  42     return 0;
  43 }
  44
  45 Vec2f wiggly_text_size(const WigglyText *wiggly_text)
  46 {
  47     trace_assert(wiggly_text);
  48
  49     const Rect boundary = sprite_font_boundary_box(
  50         vec(0.0f, 0.0f),
  51         wiggly_text->scale,
  52         strlen(wiggly_text->text));
  53
  54     return vec(boundary.w, boundary.h);
  55 }