add performance stats

1 files changed, 24 insertions, 0 deletions

diff --git a/js/performance-stats.js b/js/performance-stats.js
new file mode 100644
index 0000000..1015308
--- /dev/null
+++ b/js/performance-stats.js
@@ -0,0 +1,24 @@
+var stats = new Stats();
+stats.setMode(0);
+document.body.appendChild(stats.domElement);
+
+var canvas = document.createElement('canvas');
+canvas.width = 512;
+canvas.height = 512;
+document.body.appendChild(canvas);
+
+var context = canvas.getContext('2d');
+context.fillStyle = 'rgba(127,0,255,0.05)';
+setInterval(function () {
+    var time = Date.now() * 0.001;
+    context.clearRect(0, 0, 512, 512);
+    stats.begin();
+    for (var i = 0; i < 2000; i++) {
+        var x = Math.cos(time + i * 0.01) * 196 + 256;
+        var y = Math.sin(time + i * 0.01234) * 196 + 256;
+        context.beginPath();
+        context.arc(x, y, 10, 0, Math.PI * 2, true);
+        context.fill();
+    }
+    stats.end();
+}, 1000 / 60);
\ No newline at end of file