feature: vor und nachteile

praesentation/node_modules/d3-shape/src/symbol/triangle2.js

@@ -0,0 +1,15 @@
+import {sqrt} from "../math.js";
+
+const sqrt3 = sqrt(3);
+
+export default {
+  draw(context, size) {
+    const s = sqrt(size) * 0.6824;
+    const t = s  / 2;
+    const u = (s * sqrt3) / 2; // cos(Math.PI / 6)
+    context.moveTo(0, -s);
+    context.lineTo(u, t);
+    context.lineTo(-u, t);
+    context.closePath();
+  }
+};