Modified sunflower

test/codegen/sunflower/painter.dart

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library painter;
+
+import 'dom.dart';
+import 'dart:math';
+
+import 'circle.dart';
+
+const ORANGE = "orange";
+const RED = "red";
+const BLUE = "blue";
+const TAU = PI * 2;
+
+Element querySelector(String selector) => document.querySelector(selector);

[Jennifer Messerly, 2015/05/28 21:04:22]

move this to dom.dart?

[vsm, 2015/05/29 13:23:01]

Moved it to sunflower - I've been using the type on this for demoing dynamic, so
handy to have here.

+
+final canvas = querySelector("#canvas") as CanvasElement;
+final context = canvas.getContext('2d') as CanvasRenderingContext2D;

[Jennifer Messerly, 2015/05/28 21:04:22]

I wonder if "context" should be an input to "draw"?

[vsm, 2015/05/29 13:23:01]

Done.  Moved to these to sunflower and passing in instead.

+
+abstract class CirclePainter implements Circle {
+  // This demonstrates a field in a mixin.
+  String color = ORANGE;
+
+  /// Draw a small circle representing a seed centered at (x,y).
+  void draw() {
+    context
+      ..beginPath()
+      ..lineWidth = 2
+      ..fillStyle = color
+      ..strokeStyle = color
+      ..arc(x, y, radius, 0, TAU, false)
+      ..fill()
+      ..closePath()
+      ..stroke();
+  }
+}