John Messerly
0c148ecef4
Highlights * compile one module at a time * use summaries to speed up compiles * use command runner so we can add more commands later * some long needed renames and file organization * various other technical debt has been addressed Lowlights * lost node.js runner/tests (node output format still supported) * possibly lost some closure support/workarounds (format still supported) * needs more end-to-end tests of the new system R=vsm@google.com Review URL: https://codereview.chromium.org/1879373004 .
39 lines
1.0 KiB
Dart
39 lines
1.0 KiB
Dart
// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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library painter;
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import 'dart:html';
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import 'dart:math';
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import 'circle.dart';
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const ORANGE = "orange";
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const RED = "red";
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const BLUE = "blue";
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const TAU = PI * 2;
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Element querySelector(String selector) => document.querySelector(selector);
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final canvas = querySelector("#canvas") as CanvasElement;
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final context = canvas.getContext('2d') as CanvasRenderingContext2D;
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abstract class CirclePainter implements Circle {
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// This demonstrates a field in a mixin.
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String color = ORANGE;
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/// Draw a small circle representing a seed centered at (x,y).
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void draw(CanvasRenderingContext2D context) {
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context
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..beginPath()
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..lineWidth = 2
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..fillStyle = color
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..strokeStyle = color
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..arc(x, y, radius, 0, TAU, false)
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..fill()
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..closePath()
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..stroke();
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}
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}
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