clock jiggery

typedef struct _segment {
  float x0, y0;
  float x_step, y_step;
  int num_leds;
} led_segment; 

typedef struct _element {
  int num_segments;
  int total_leds;
  float width;
  float height;
  led_segment segments[];
} led_element;

const led_element colon = {
  .num_segments  = 1,
  .total_leds = 2,
  .width = 27, /* mm */
  .height = 180,
  /* x0, y0, step_x, step_y, steps */
  { 18.9, 128.3, -10.8, -76.6, 2 } // led 0 on top
//  { 8.1, 51.7, 10.8, 76.6, 2 } // led 0 on bottom
};

const led_element test = {
  .num_segments = 1,
  .total_leds = 4,
  .width = 9.6,
  .height = 66.4,
  {
    { 23.6, 103.3,  2.4,  16.6, 4 }, /* seg 0, slant */
  }
};

const led_element digit = {
  .num_segments = 7,
  .total_leds = 28,
  .width = 119.8,
  .height = 180,
  {
    /* 
      x0,     y0,     x_step, y_step, steps (leds)
    */
    { 23.6,   103.3,  2.4,    16.6,   4 }, /* seg 0, slant */
    { 45.8,   166.5,  16.6,   0,      4 }, /* seg 1, horiz */
    { 107.1,  153.3,  -2.4,   -16.6,  4 }, /* seg 2, slant */
    { 96.4,   76.7,   -2.4,   -16.6,  4 }, /* seg 3, slant */
    { 74.2,   13.5,   -16.6,  0,      4 }, /* seg 4, horiz */
    { 12.9,   26.8,   2.4,    16.6,   4 }, /* seg 5, slant */
    { 35.1,   90,     16.6,   0,      4 }  /* seg 6, horiz */
  }
};