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Added rtrapezoid()

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Revar Desmera 2019-02-10 17:19:26 -08:00
parent ea39fa0da5
commit 63f8c913f1
1 changed files with 41 additions and 0 deletions
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shapes.scad
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@ -503,6 +503,47 @@ module trapezoid(size1=[1,1], size2=[1,1], h=1, center=false)
}
// Creates a trapezoidal prism with rounded vertical edges.
// size1 = [width, length] of the bottom of the prism.
// size2 = [width, length] of the top of the prism.
// h = Height of the prism.
// r = radius of vertical edge fillets.
// r1 = radius of vertical edge fillets at bottom.
// r2 = radius of vertical edge fillets at top.
// center = vertically center the prism.
// Example:
// rtrapezoid(size1=[40,40], size2=[0,0], h=40, r=5, center=false);
// rtrapezoid(size1=[40,60], size2=[40,60], h=40, r1=0, r2=10, center=true);
// rtrapezoid(size1=[20,60], size2=[40,30], h=40, r1=5, r2=10, center=false);
module rtrapezoid(size1, size2, h, r=undef, r1=undef, r2=undef, center=true)
{
eps = 0.001;
maxrad1 = min(size1[0]/2, size1[1]/2);
maxrad2 = min(size2[0]/2, size2[1]/2);
rr1 = min(maxrad1, (r1!=undef)? r1 : r);
rr2 = min(maxrad2, (r2!=undef)? r2 : r);
down(center? h/2 : 0) {
hull() {
linear_extrude(height=eps, center=false, convexity=2) {
offset(r=rr1) {
square([max(eps, size1[0]-2*rr1), max(eps, size1[1]-2*rr1)], center=true);
}
}
up(h-0.01) {
linear_extrude(height=eps, center=false, convexity=2) {
offset(r=rr2) {
square([max(eps, size2[0]-2*rr2), max(eps, size2[1]-2*rr2)], center=true);
}
}
}
}
}
}
module trapezoid(size1=[1,1], size2=[1,1], h=1, center=false)
// Makes a 2D teardrop shape. Useful for extruding into 3D printable holes.
// r = radius of circular part of teardrop. (Default: 1)
// d = diameter of spherical portion of bottom. (Use instead of r)