stfu/Source/Maker/Widgets/slider.c

#if defined(STFU_MAIN) && !defined(STFU_SLIDER)
#define STFU_SLIDER

#include <stdbool.h>

#include "../config.h"
#include "border.c"

#define STFU_SLIDER_WIDTH 16

struct stfu_slider {
  float x, y;
  float width, height;
  float r, g, b;
  float min, max, cur;
  bool integeric;
};

static void stfu_draw_slider(struct stfu_slider slider) {
  /* Border */
  stfu_draw_border((struct stfu_border){
      .x = slider.x,
      .y = slider.y,
      .width = slider.width,
      .height = slider.height,
      .r = slider.r,
      .g = slider.g,
      .b = slider.b,
  });

  /* Slider */
  {
    float progress = (slider.cur - slider.min) / (slider.max - slider.min);
    float x = slider.x + (slider.width - STFU_SLIDER_WIDTH) * progress;

    sgl_begin_quads();
    sgl_c3f(slider.r, slider.g, slider.b);
    sgl_v2f(x, slider.y);
    sgl_v2f(x + STFU_SLIDER_WIDTH, slider.y);
    sgl_v2f(x + STFU_SLIDER_WIDTH, slider.y + slider.height);
    sgl_v2f(x, slider.y + slider.height);
    sgl_end();
  }
}

static struct stfu_slider stfu_press_slider(struct stfu_slider slider, float x,
                                            float y) {
  if (x < slider.x || x > slider.x + slider.width)
    return slider;
  if (y < slider.y || y > slider.y + slider.height)
    return slider;

  slider.cur = slider.min +
               ((x - slider.x) / (slider.width)) * (slider.max - slider.min);

  if (slider.integeric)
    slider.cur = floorf(slider.cur);

  return slider;
}

#endif