1  use <../functions.scad>
 2  
 3  // we do this weird key_shape_type check here because rounded_square uses
 4  // square_shape, and we want flat sides to work for that too.
 5  // could be refactored, idk
 6  module square_shape(size, delta, progress){
 7    if ($key_shape_type == "flat_sided_square") {
 8      flat_sided_square_shape(size, delta,progress);
 9    } else {
10      square(size - delta * progress, center = true);
11    }
12  }
13  /*
14  [-size.x /2,-size.y / 2],
15  [size.x / 2,-size.y / 2],
16  [size.x / 2, size.y / 2],
17  [-size.x / 2, size.y / 2] */
18  
19  // for side-printed keycaps. Any amount of top tilt (on a keycap with a smaller
20  // top than bottom) makes the left and right side of the keycap convex. This
21  // shape makes the sides flat by making the top a trapezoid.
22  // This obviously doesn't work with rounded sides at all
23  module flat_sided_square_shape(size, delta, progress) {
24    polygon(skin_flat_sided_square_shape(size, delta, progress));
25  }
26  
27  function skin_flat_sided_square_shape(size,delta,progress) = [
28    [(-size.x + (delta.x + extra_keytop_length_for_flat_sides()) * progress)/2, (-size.y + delta.y * progress)/2],
29    [(size.x - (delta.x + extra_keytop_length_for_flat_sides()) * progress)/2,(-size.y + delta.y * progress)/2],
30    [(size.x - (delta.x - extra_keytop_length_for_flat_sides()) * progress)/2, (size.y - delta.y * progress)/2],
31    [(-size.x + (delta.x - extra_keytop_length_for_flat_sides()) * progress)/2, (size.y - delta.y * progress)/2]
32  ];
33  
34  function rectangle_profile(size) = [
35    [-size.x/2, -size.y/2],
36    [size.x/2, -size.y/2],
37    [size.x/2, size.y/2],
38    [-size.x/2, size.y/2],
39  ];
40  
41  function skin_square_shape(size, delta, progress, thickness_difference) =
42    let(
43      width = size[0],
44      height = size[1],
45  
46      width_difference = delta[0] * progress,
47      height_difference = delta[1] * progress,
48  
49      square_size = [
50        width - width_difference - thickness_difference,
51        height - height_difference - thickness_difference
52      ]
53    ) $key_shape_type == "flat_sided_square" ? skin_flat_sided_square_shape(size, delta, progress) : rectangle_profile(square_size);