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This demo shows how to create a spinning square using the lowest-level APIs. We should probably create more spinning square demos at the other layers of the system. R=eseidel@chromium.org Review URL: https://codereview.chromium.org/1147393002
26 lines
777 B
Dart
26 lines
777 B
Dart
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:sky';
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double timeBase = null;
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void beginFrame(double timeStamp) {
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if (timeBase == null)
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timeBase = timeStamp;
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double delta = timeStamp - timeBase;
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PictureRecorder canvas = new PictureRecorder(view.width, view.height);
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canvas.translate(view.width / 2.0, view.height / 2.0);
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canvas.rotateDegrees(delta / 10);
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canvas.drawRect(new Rect()..setLTRB(-100.0, -100.0, 100.0, 100.0),
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new Paint()..setARGB(255, 0, 255, 0));
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view.picture = canvas.endRecording();
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view.scheduleFrame();
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}
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void main() {
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view.setBeginFrameCallback(beginFrame);
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view.scheduleFrame();
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}
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