54 lines
1.4 KiB
OpenSCAD
54 lines
1.4 KiB
OpenSCAD
$fs=.1;
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unit = 19.05;
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module key_shape(width, height, width_difference, height_difference, corner_size) {
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if ($key_shape_type == "iso_enter") {
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fakeISOEnter(width_difference/2);
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} else if ($key_shape_type == "normal") {
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roundedSquare([width - width_difference, height - height_difference], corner_size);
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} else if ($key_shape_type == "circle") {
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circle(d=width - width_difference);
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}
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}
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// centered
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module roundedRect(size, radius, center=true) {
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linear_extrude(height = size[2]){
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roundedSquare([size[0], size[1]], radius, center=center);
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}
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}
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module roundedSquare(size, radius, center = true) {
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offset(r=radius){
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square([size[0] - radius * 2, size[1] - radius * 2], center=center);
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}
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}
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// corollary is roundedSquare
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// NOT 3D
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module fakeISOEnter(thickness_difference = 0){
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// t is all modifications to the polygon array
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// t used to contain a corner radius adjustment, but due to
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// the offset we need that expansion back
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t = (thickness_difference - (unit - 18.16));
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function unit(length) = unit * length;
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pointArray = [
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[unit(-.625) + t, unit(-1) + t],
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[unit(0.625) - t, unit(-1) + t],
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[unit(0.625) - t, unit(1) - t],
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[unit(-0.875) + t, unit(1) - t],
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[unit(-0.875) + t, unit(0) + t],
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[unit(-0.625) + t, unit(0) + t]
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];
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minkowski(){
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circle(r=$corner_radius);
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// gives us rounded inner corner
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offset(r=-$corner_radius*2) {
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polygon(points=pointArray);
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}
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}
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}
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