diziet-utils: Provide ellipse

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/diziet-utils/utils.scad b/diziet-utils/utils.scad
index e440b5f03d6cf1966889522bbc497946d851fb57..6a0964d3fb4906e4e2c7c32ccfad06ff5d2cc9fb 100644 (file)
--- a/diziet-utils/utils.scad
+++ b/diziet-utils/utils.scad
@@ -49,3 +49,9 @@ module linextr_y_xz(y0,y1, convexity=20) { // XY turn into YZ
     linextr(y0,y1, convexity=convexity)
     children();
 }
+
+module ellipse(radii) {
+  r = max(radii[0], radii[1]);
+  scale(radii / r)
+    circle(r);
+}