Added Espruino Rotating Cube as an App

apps/cube/cube.js

@@ -0,0 +1,58 @@
+// Draw a rotating cube wireframe...
+// X and Y rotation
+var rx = 0, ry = 0;
+
+// draw a cube
+function draw() {
+  var rcx=Math.cos(rx),
+      rsx=Math.sin(rx),
+      rcy=Math.cos(ry),
+      rsy=Math.sin(ry);
+  // Project 3D coordinates into 2D
+  function p(x,y,z) {
+    var t;
+    t = x*rcy + z*rsy;
+    z = z*rcy - x*rsy;
+    x=t;
+    t = y*rcx + z*rsx;
+    z = z*rcx - y*rsx;
+    y=t;
+    z += 4;
+    return [g.getWidth() * (0.5 + x/z), g.getHeight() * (0.5 + y/z)];
+  }
+
+  var a;
+  // draw a series of lines to make up our cube
+  a = p(-1,-1,-1); g.moveTo(a[0],a[1]);
+  a = p(1,-1,-1); g.lineTo(a[0],a[1]);
+  a = p(1,1,-1); g.lineTo(a[0],a[1]);
+  a = p(-1,1,-1); g.lineTo(a[0],a[1]);
+  a = p(-1,-1,-1); g.lineTo(a[0],a[1]);
+  a = p(-1,-1,1); g.moveTo(a[0],a[1]);
+  a = p(1,-1,1); g.lineTo(a[0],a[1]);
+  a = p(1,1,1); g.lineTo(a[0],a[1]);
+  a = p(-1,1,1); g.lineTo(a[0],a[1]);
+  a = p(-1,-1,1); g.lineTo(a[0],a[1]);
+  a = p(-1,-1,-1); g.moveTo(a[0],a[1]);
+  a = p(-1,-1,1); g.lineTo(a[0],a[1]);
+  a = p(1,-1,-1); g.moveTo(a[0],a[1]);
+  a = p(1,-1,1); g.lineTo(a[0],a[1]);
+  a = p(1,1,-1); g.moveTo(a[0],a[1]);
+  a = p(1,1,1); g.lineTo(a[0],a[1]);
+  a = p(-1,1,-1); g.moveTo(a[0],a[1]);
+  a = p(-1,1,1); g.lineTo(a[0],a[1]);
+}
+
+// rotate and redraw the cube
+function step() {
+  // rotate
+  rx += 0.1;
+  ry += 0.11;
+  // draw
+  g.clear();
+  g.setColor(0xFFFF);
+  draw();
+}
+
+g.clear();
+setInterval(step,50);