1 files changed, 183 insertions, 0 deletions
diff --git a/chromium/third_party/skia/experimental/SkV8Example/gears.js b/chromium/third_party/skia/experimental/SkV8Example/gears.js
new file mode 100644
index 00000000000..a901f9d9211
--- /dev/null
+++ b/chromium/third_party/skia/experimental/SkV8Example/gears.js
@@ -0,0 +1,183 @@
+var IS_SKV8 = typeof document == "undefined";
+var HAS_PATH = typeof Path2D != "undefined";
+var HAS_DISPLAY_LIST = typeof DisplayList != "undefined";
+
+var NumTeeth = 24;
+var NumGears = 60;
+var DeltaTheta = Math.PI/90;
+var FaceColors = ["#000099", "#006600", "#990000", "#EEEE00"];
+var SideColors = ["#0000FF", "#009900", "#FF0000", "#CCCC00"];
+
+function makeGear(pathLike, r) {
+  var dT = Math.PI*2/NumTeeth;
+  var dTq = dT/4;
+  var outer = r;
+  var inner = 0.7 * r;
+  pathLike.moveTo(Math.sin(-2*dTq)*outer, Math.cos(-2*dTq)*outer);
+  for (var i=0; i<NumTeeth; i+=2) {
+    pathLike.lineTo(Math.sin(dT*i-dTq)*outer, Math.cos(dT*i-dTq)*outer);
+    pathLike.lineTo(Math.sin(dT*i+dTq)*inner, Math.cos(dT*i+dTq)*inner);
+    pathLike.lineTo(Math.sin(dT*(i+1)-dTq)*inner, Math.cos(dT*(i+1)-dTq)*inner);
+    pathLike.lineTo(Math.sin(dT*(i+1)+dTq)*outer, Math.cos(dT*(i+1)+dTq)*outer);
+  }
+}
+
+function gearPath(r) {
+  if (HAS_PATH) {
+    p = new Path2D();
+    makeGear(p, r)
+    p.closePath();
+    return p;
+  } else {
+    return null;
+  }
+}
+
+function gearDisplayListStroke(r, color) {
+  if (HAS_DISPLAY_LIST) {
+    p = new Path2D();
+    makeGear(p, r)
+    p.closePath();
+    var dl = new DisplayList();
+    dl.strokeStyle = color;
+    dl.stroke(p);
+    dl.finalize()
+    return dl;
+  } else {
+    return null;
+  }
+}
+
+function gearDisplayListFill(r, color) {
+  if (HAS_DISPLAY_LIST) {
+    p = new Path2D();
+    makeGear(p, r)
+    p.closePath();
+    var dl = new DisplayList();
+    dl.fillStyle = color;
+    dl.fill(p);
+    dl.finalize()
+    return dl;
+  } else {
+    return null;
+  }
+}
+
+function strokeGear(ctx, gear) {
+  if (HAS_PATH) {
+    ctx.stroke(gear.path);
+  } else {
+    ctx.beginPath();
+    makeGear(ctx, gear.r);
+    ctx.closePath();
+    ctx.stroke();
+  }
+}
+
+function fillGear(ctx) {
+  if (HAS_PATH) {
+    ctx.fill(gear.path);
+  } else {
+    ctx.beginPath();
+    makeGear(ctx, gear.r);
+    ctx.closePath();
+    ctx.fill();
+  }
+}
+
+function draw3DGear(ctx, angle, gear) {
+  ctx.strokeStyle = gear.sideColor;
+  ctx.fillStyle = gear.faceColor;
+  ctx.rotate(angle);
+  strokeGear(ctx, gear);
+  for (var i=0; i < 20; i++) {
+    ctx.rotate(-angle);
+    ctx.translate(0.707, 0.707);
+    ctx.rotate(angle);
+    if (HAS_DISPLAY_LIST) {
+        ctx.draw(gear.gearStroke);
+    } else {
+        strokeGear(ctx, gear);
+    }
+  }
+  if (HAS_DISPLAY_LIST) {
+      ctx.draw(gear.gearFill);
+  } else {
+      fillGear(ctx, gear);
+  }
+  ctx.rotate(-angle);
+}
+
+function draw3DGearAt(ctx, angle, gear) {
+  ctx.save();
+  ctx.translate(gear.x, gear.y);
+  draw3DGear(ctx, angle, gear);
+  ctx.restore();
+}
+
+var onDraw = function() {
+  var ticks=0;
+  var rotation = 0;
+  var gears = [];
+
+  for (var i=0; i<NumGears; i++) {
+    color = Math.floor(Math.random()*FaceColors.length);
+    r = Math.random()*100+5;
+    gears.push({
+        x: Math.random()*500,
+        y: Math.random()*500,
+        path: gearPath(r),
+        gearFill: gearDisplayListFill(r, FaceColors[color]),
+        gearStroke: gearDisplayListStroke(r, SideColors[color]),
+        r: r,
+        faceColor: FaceColors[color],
+        sideColor: SideColors[color]
+    });
+  }
+
+  function draw(ctx) {
+    ctx.resetTransform();
+
+    ctx.fillStyle = "#FFFFFF";
+    ctx.fillRect(0, 0, 499, 499);
+
+    rotation += DeltaTheta;
+    if (rotation >= Math.PI*2) {
+      rotation = 0;
+    }
+
+    for (var i=0; i < gears.length; i++) {
+      gear = gears[i];
+      draw3DGearAt(ctx, rotation, gear);
+    }
+
+    ticks++;
+    if (IS_SKV8) {
+      inval();
+    }
+  };
+
+  function fps() {
+    console.log(ticks);
+    ticks = 0;
+    setTimeout(fps, 1000);
+  };
+
+  setTimeout(fps, 1000);
+
+  return draw;
+}();
+
+if (!IS_SKV8) {
+  window.onload = function(){
+    var canvas = document.getElementById("gears");
+    var ctx = canvas.getContext("2d");
+    function drawCallback() {
+      onDraw(ctx);
+      setTimeout(drawCallback, 1);
+    }
+    setTimeout(drawCallback, 1);
+  }
+}
+
+console.log("HAS_PATH: " + HAS_PATH);