Create triangle.js

files/triangle.js

@@ -0,0 +1,114 @@
+// License: MPL-2.0
+// This Source Code is subject to the terms of the Mozilla Public License, v2.0,
+// If a copy of the MPL was not distributed with this file,
+// Then you can obtain one at https://mozilla.org/MPL/2.0/
+(function(Scratch) {
+    if (!Scratch.extensions.unsandboxed) {
+      throw new Error("EvalPlus must be unsandboxed");
+    }
+
+    const vm = Scratch.vm,
+    runtime = vm.runtime;
+
+    class TriangleRenderer {
+
+      getInfo() {
+        return {
+          id: 'TriangleRenderer',
+          name: 'Triangle Drawer',
+          color1: '#046973',
+          blocks: [{
+            opcode: 'triangle',
+            blockType: Scratch.BlockType.COMMAND,
+            text: 'draw triangle ([p0],[p1]) ([p2],[p3]) ([p4],[p5]) thickness: [p6]',
+            arguments: {
+              p0: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: '0'
+              },
+              p1: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: '0'
+              },
+              p2: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: '0'
+              },
+              p3: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: '0'
+              },
+              p4: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: '0'
+              },
+              p5: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: '0'
+              },
+              p6: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: '0'
+              },
+            },
+          }, ]
+        };
+      }
+
+      triangle({p0,p1,p2,p3,p4,p5,p6}) {
+        const target = vm.editingTarget
+        let tri2 = Math.sqrt(Math.pow(+p2 - +p4) + Math.pow(+p3 - +p5));
+        let tri3 = Math.sqrt(Math.pow(+p0 - +p4) + Math.pow(+p1 - +p5));
+        let tri4 = Math.sqrt(Math.pow(+p0 - +p2) + Math.pow(+p1 - +p3));
+        let tri5;
+        let tri6;
+        let tri7;
+        let tri8;
+        let tri1 = (tri2 + tri3 + tri4) / 2;
+        let tri0 = 2 * Math.sqrt(((tri1 - tri2) * (tri1 - tri3) * (tri1 - tri4)) / tri1);
+        tri1 = (tri1 || 0) + (tri1 || 0);
+        target.setXY((((tri2 * +p0) + (tri3 * +p2) + (tri4 * +p4)) / tri1), (((tri2 * +p1) + (tri3 * +p3) + (tri4 * +p5)) / tri1));
+        runtime.ext_pen._setPenSizeTo(tri0, target);
+        runtime.ext_pen._penDown(target);
+          if (!(tri0 <= 0)) {
+            if (tri3 < tri2 || tri4, tri2) {
+          if (tri4 < tri3) {
+          tri1 = target.x - +p4;
+          tri2 = target.y - +p5;
+        } else {
+          tri1 = target.x - +p2;
+          tri2 = target.y - +p3;
+        }
+      } else {
+        tri1 = target.x - +p0;
+        tri2 = target.y - +p1;
+      }
+      tri1 = (Math.sqrt(Math.pow(+tri1) + Math.pow(+tri2))) / (+tri0 / 2);
+      tri8 = ((tri1 * +p6) / (tri1 - 1)) + 0.25;
+      tri1 = 0.5 - (0.5 / tri1);
+      tri2 = (target.x - +p0) / +tri0;
+      tri3 = (target.y - +p1) / +tri0;
+      tri4 = (target.x - +p2) / +tri0;
+      tri5 = (target.y - +p3) / +tri0;
+      tri6 = (target.x - +p4) / +tri0;
+      tri7 = (target.y - +p5) / +tri0;
+      while (!(tri0 < tri8)) {
+        tri0 = +tri1 * +tri0;
+        runtime.ext_pen._setPenSizeTo(tri0 + 0.5, target);
+        target.setXY(+p0 + (tri0 * +tri2), +p1 + (tri0 * +tri3));
+        target.setXY(+p2 + (tri0 * +tri4), +p3 + (tri0 * +tri5));
+        target.setXY(+p4 + (tri0 * +tri6), +p5 + (tri0 * +tri7));
+        target.setXY(+p0 + (tri0 * +tri2), +p1 + (tri0 * +tri3));
+      }
+    }
+    runtime.ext_pen._setPenSizeTo(+p6, target);
+    target.setXY(+p0, +p1);
+    target.setXY(+p2, +p3);
+    target.setXY(+p4, +p5);
+    target.setXY(+p0, +p1);
+    runtime.ext_pen._penUp(target);
+  }
+}
+
+Scratch.extensions.register(new TriangleRenderer());
+})(Scratch);