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7064551a45
What's important about this code is that it's presenting services outside the VM, not the particular technology used to present the services.
99 lines
2.9 KiB
Dart
99 lines
2.9 KiB
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:math' as math;
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import 'dart:sky' as sky;
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import 'dart:typed_data';
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import 'package:sky/services.dart';
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double timeBase = null;
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sky.Image image = null;
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String url1 = "https://www.dartlang.org/logos/dart-logo.png";
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String url2 = "http://i2.kym-cdn.com/photos/images/facebook/000/581/296/c09.jpg";
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sky.Picture paint(sky.Rect paintBounds, double delta) {
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sky.PictureRecorder recorder = new sky.PictureRecorder();
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sky.Canvas canvas = new sky.Canvas(recorder, paintBounds);
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canvas.translate(paintBounds.width / 2.0, paintBounds.height / 2.0);
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canvas.rotate(math.PI * delta / 1800);
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canvas.scale(0.2, 0.2);
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sky.Paint paint = new sky.Paint()..color = const sky.Color.fromARGB(255, 0, 255, 0);
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// Draw image
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if (image != null)
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canvas.drawImage(image, new sky.Point(-image.width / 2.0, -image.height / 2.0), paint);
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// Draw cut out of image
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canvas.rotate(math.PI * delta / 1800);
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if (image != null) {
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var w = image.width.toDouble();
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var h = image.width.toDouble();
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canvas.drawImageRect(image,
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new sky.Rect.fromLTRB(w * 0.25, h * 0.25, w * 0.75, h * 0.75),
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new sky.Rect.fromLTRB(-w / 4.0, -h / 4.0, w / 4.0, h / 4.0),
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paint);
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}
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return recorder.endRecording();
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}
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sky.Scene composite(sky.Picture picture, sky.Rect paintBounds) {
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final double devicePixelRatio = sky.view.devicePixelRatio;
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sky.Rect sceneBounds = new sky.Rect.fromLTWH(0.0, 0.0, sky.view.width * devicePixelRatio, sky.view.height * devicePixelRatio);
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Float32List deviceTransform = new Float32List(16)
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..[0] = devicePixelRatio
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..[5] = devicePixelRatio
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..[10] = 1.0
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..[15] = 1.0;
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sky.SceneBuilder sceneBuilder = new sky.SceneBuilder(sceneBounds)
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..pushTransform(deviceTransform)
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..addPicture(sky.Offset.zero, picture, paintBounds)
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..pop();
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return sceneBuilder.build();
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}
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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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sky.Rect paintBounds = new sky.Rect.fromLTWH(0.0, 0.0, sky.view.width, sky.view.height);
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sky.Picture picture = paint(paintBounds, delta);
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sky.Scene scene = composite(picture, paintBounds);
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sky.view.scene = scene;
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sky.view.scheduleFrame();
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}
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void handleImageLoad(result) {
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if (result != image) {
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print("${result.width}x${result.width} image loaded!");
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image = result;
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sky.view.scheduleFrame();
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} else {
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print("Existing image was loaded again");
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}
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}
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bool handleEvent(sky.Event event) {
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if (event.type == "pointerdown") {
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return true;
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}
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if (event.type == "pointerup") {
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imageCache.load(url2).first.then(handleImageLoad);
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return true;
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}
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return false;
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}
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void main() {
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imageCache.load(url1).first.then(handleImageLoad);
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sky.view.setEventCallback(handleEvent);
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sky.view.setFrameCallback(beginFrame);
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}
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