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add backside() and fontside() helpers

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Bob 2022-02-22 13:11:12 -05:00
parent dbe5bca1a9
commit 4bce68dfbb
3 changed files with 184 additions and 21 deletions
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55
src/key_transformations.scad
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@ -193,6 +193,7 @@ module upside_down() {
}
module sideways() {
$stem_support_type = "disable";
$key_shape_type = "flat_sided_square";
$dish_overdraw_width = abs(extra_keytop_length_for_flat_sides());
extra_y_rotation = atan2($width_difference/2,$total_depth); // TODO assumes centered top
@ -200,6 +201,60 @@ module sideways() {
rotate([0,90 + extra_y_rotation ,0]) children();
}
/* this is hard to explain. we want the angle of the back of the keycap.
* first we draw a line at the back of the keycap perpendicular to the ground.
* then we extend the line created by the slope of the keytop to that line
* the angle of the latter line off the ground is $top_tilt, and
* you can create a right triangle with the adjacent edge being $bottom_key_height/2
* raised up $total_depth. this gets you x, the component of the extended
* keytop slope line, and y, a component of the first perpendicular line.
* by a very similar triangle you get r and s, where x is the hypotenuse of that
* right triangle and the right angle is again against the first perpendicular line
* s is the opposite line in the right triangle required to find q, the angle
* of the back. if you subtract r from $total_depth plus y you can now use these
* two values in atan to find the angle of interest.
*/
module backside() {
$stem_support_type = "disable";
// $key_shape_type = "flat_sided_square";
a = $bottom_key_height;
b = $total_depth;
c = top_total_key_height();
x = (a / 2 - $top_skew) / cos(-$top_tilt) - c / 2;
y = sin(-$top_tilt) * (x + c/2);
r = sin(-$top_tilt) * x;
s = cos(-$top_tilt) * x;
q = atan2(s, (y + b - r));
translate([0,0,cos(q) * total_key_height()/2])
rotate([-90 - q, 0,0]) children();
}
// this is just backside with a few signs switched
module frontside() {
$stem_support_type = "disable";
// $key_shape_type = "flat_sided_square";
a = $bottom_key_height;
b = $total_depth;
c = top_total_key_height();
x = (a / 2 + $top_skew) / cos($top_tilt) - c / 2;
y = sin($top_tilt) * (x + c/2);
r = sin($top_tilt) * x;
s = cos($top_tilt) * x;
q = atan2(s, (y + b - r));
translate([0,0,cos(q) * total_key_height()/2])
rotate([90 + q, 0,0]) children();
}
// emulating the % modifier.
// since we use custom colors, just using the % modifier doesn't work
module debug() {