src/ui/wiggly_text.c

   1 #include <SDL.h>
   2
   3 #include "math/point.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 int wiggly_text_render(const WigglyText *wiggly_text,
  13                        const Camera *camera,
  14                        Vec 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         if (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))) < 0) {
  35             return -1;
  36         }
  37     }
  38
  39     return 0;
  40 }
  41
  42 int wiggly_text_update(WigglyText *wiggly_text, float delta_time)
  43 {
  44     trace_assert(wiggly_text);
  45     wiggly_text->angle = fmodf(wiggly_text->angle + 10.0f * delta_time, 2 * PI);
  46     return 0;
  47 }
  48
  49 Vec wiggly_text_size(const WigglyText *wiggly_text, const Camera *camera)
  50 {
  51     trace_assert(wiggly_text);
  52
  53     const Rect boundary = camera_text_boundary_box(
  54         camera,
  55         vec(0.0f, 0.0f),
  56         wiggly_text->scale,
  57         wiggly_text->text);
  58
  59     return vec(boundary.w, boundary.h);
  60 }