110 lines
2.7 KiB
OpenSCAD
110 lines
2.7 KiB
OpenSCAD
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// Copyright (c) 2013 Oskar Linde. All rights reserved.
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// License: BSD
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//
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// This library contains basic 2D morphology operations
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//
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// outset(d=1) - creates a polygon at an offset d outside a 2D shape
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// inset(d=1) - creates a polygon at an offset d inside a 2D shape
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// fillet(r=1) - adds fillets of radius r to all concave corners of a 2D shape
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// rounding(r=1) - adds rounding to all convex corners of a 2D shape
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// shell(d,center=false) - makes a shell of width d along the edge of a 2D shape
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// - positive values of d places the shell on the outside
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// - negative values of d places the shell on the inside
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// - center=true and positive d places the shell centered on the edge
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module outset(d=1) {
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// Bug workaround for older OpenSCAD versions
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if (version_num() < 20130424) render() outset_extruded(d) child();
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else minkowski() {
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circle(r=d);
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child();
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}
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}
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module outset_extruded(d=1) {
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projection(cut=true) minkowski() {
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cylinder(r=d);
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linear_extrude(center=true) child();
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}
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}
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module inset(d=1) {
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render() inverse() outset(d=d) inverse() child();
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}
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module fillet(r=1) {
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inset(d=r) render() outset(d=r) child();
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}
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module rounding(r=1) {
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outset(d=r) inset(d=r) child();
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}
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module shell(d,center=false) {
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if (center && d > 0) {
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difference() {
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outset(d=d/2) child();
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inset(d=d/2) child();
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}
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}
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if (!center && d > 0) {
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difference() {
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outset(d=d) child();
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child();
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}
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}
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if (!center && d < 0) {
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difference() {
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child();
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inset(d=-d) child();
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}
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}
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if (d == 0) child();
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}
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// Below are for internal use only
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module inverse() {
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difference() {
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square(1e5,center=true);
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child();
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}
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}
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// TEST CODE
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use <mirror.scad>
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module arrow(l=1,w=.6,t=0.15) {
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mirror_y() polygon([[0,0],[l,0],[l-w/2,w/2],[l-w/2-sqrt(2)*t,w/2],[l-t/2-sqrt(2)*t,t/2],[0,t/2]]);
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}
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module shape() {
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polygon([[0,0],[1,0],[1.5,1],[2.5,1],[2,-1],[0,-1]]);
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}
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if(0) assign($fn=32) {
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for (p = [0:10*3-1]) assign(o=floor(p/3)) {
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translate([(p%3)*2.5,-o*3]) {
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//%if (p % 3 == 1) translate([0,0,1]) shape();
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if (p % 3 == 0) shape();
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if (p % 3 == 1) translate([0.6,0]) arrow();
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if (p % 3 == 2) {
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if (o == 0) inset(d=0.3) shape();
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if (o == 1) outset(d=0.3) shape();
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if (o == 2) rounding(r=0.3) shape();
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if (o == 3) fillet(r=0.3) shape();
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if (o == 4) shell(d=0.3) shape();
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if (o == 5) shell(d=-0.3) shape();
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if (o == 6) shell(d=0.3,center=true) shape();
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if (o == 7) rounding(r=0.3) fillet(r=0.3) shape();
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if (o == 8) shell(d=0.3,center=true) fillet(r=0.3) rounding(r=0.3) shape();
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if (o == 9) shell(d=-0.3) fillet(r=0.3) rounding(r=0.3) shape();
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}
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}
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}
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}
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