Move sunflower to a new directory, make final tweaks to make it all work.

test/codegen/sunflower.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 sunflower;
-
-import 'dart:math';
-import 'dom.dart';
-
-const String ORANGE = "orange";
-const int SEED_RADIUS = 2;
-const int SCALE_FACTOR = 4;
-const num TAU = PI * 2;
-const int MAX_D = 300;
-const num centerX = MAX_D / 2;
-const num centerY = centerX;
-
-Element querySelector(String selector) => document.querySelector(selector);
-
-final InputElement slider = querySelector("#slider");
-final Element notes = querySelector("#notes");
-final num PHI = (sqrt(5) + 1) / 2;
-int seeds = 0;
-final CanvasRenderingContext2D context =
-    (querySelector("#canvas") as CanvasElement).getContext('2d');
-
-// TODO(jmesserly): modified this example to use classes and mixins.
-class Circle {
-  final num x, y, radius;
-
-  Circle(this.x, this.y, this.radius);
-}
-
-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();
-  }
-}
-
-class SunflowerSeed extends Circle with CirclePainter {
-  SunflowerSeed(num x, num y, num radius, [String color])
-      : super(x, y, radius) {
-    if (color != null) this.color = color;
-  }
-}
-
-void main() {
-  slider.addEventListener('change', (e) => draw());
-  draw();
-}
-
-/// Draw the complete figure for the current number of seeds.
-void draw() {
-  seeds = int.parse(slider.value);
-  context.clearRect(0, 0, MAX_D, MAX_D);
-  for (var i = 0; i < seeds; i++) {
-    final num theta = i * TAU / PHI;
-    final num r = sqrt(i) * SCALE_FACTOR;
-    final num x = centerX + r * cos(theta);
-    final num y = centerY - r * sin(theta);
-    new SunflowerSeed(x, y, SEED_RADIUS).draw();
-  }
-  notes.textContent = "$seeds seeds";
-}