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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/Polygon.d @ 104:88652073d1c2
More work on icu
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 02 May 2009 11:27:24 +0200 |
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1 /******************************************************************************* |
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2 * Copyright (c) 2000, 2005 IBM Corporation and others. |
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3 * All rights reserved. This program and the accompanying materials |
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4 * are made available under the terms of the Eclipse Public License v1.0 |
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5 * which accompanies this distribution, and is available at |
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6 * http://www.eclipse.org/legal/epl-v10.html |
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7 * |
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8 * Contributors: |
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9 * IBM Corporation - initial API and implementation |
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10 * Alex Selkov - Fix for Bug# 22701 |
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11 * Port to the D programming language: |
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12 * Frank Benoit <benoit@tionex.de> |
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13 *******************************************************************************/ |
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14 module org.eclipse.draw2d.Polygon; |
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15 |
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16 import java.lang.all; |
16
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17 import java.util.List; |
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18 import org.eclipse.draw2d.Polyline; |
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19 import org.eclipse.draw2d.Graphics; |
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20 import org.eclipse.draw2d.IFigure; |
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21 |
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22 /** |
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23 * Renders a {@link org.eclipse.draw2d.geometry.PointList} as a polygonal shape. |
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24 * This class is similar to Polyline, except the PointList is closed and can be filled in |
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25 * as a solid shape. |
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26 * @see Polyline |
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27 */ |
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28 public class Polygon |
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29 : Polyline |
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30 { |
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31 |
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32 /** |
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33 * Returns whether the point (x,y) is contained inside this polygon. |
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34 * @param x the X coordinate |
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35 * @param y the Y coordinate |
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36 * @return whether the point (x,y) is contained in this polygon |
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37 */ |
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38 public bool containsPoint(int x, int y) { |
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39 if (!getBounds().contains(x, y)) |
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40 return false; |
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41 |
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42 bool isOdd = false; |
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43 int[] pointsxy = getPoints().toIntArray(); |
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44 int n = pointsxy.length; |
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45 if (n > 3) { //If there are at least 2 Points (4 ints) |
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46 int x1, y1; |
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47 int x0 = pointsxy[n - 2]; |
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48 int y0 = pointsxy[n - 1]; |
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49 |
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50 for (int i = 0; i < n; x0 = x1, y0 = y1) { |
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51 x1 = pointsxy[i++]; |
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52 y1 = pointsxy[i++]; |
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53 |
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54 if (y0 <= y && y < y1 |
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55 && crossProduct(x1, y1, x0, y0, x, y) > 0) |
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56 isOdd = !isOdd; |
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57 if (y1 <= y && y < y0 |
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58 && crossProduct(x0, y0, x1, y1, x, y) > 0) |
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59 isOdd = !isOdd; |
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60 } |
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61 if (isOdd) |
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62 return true; |
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63 } |
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64 |
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65 List children = getChildren(); |
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66 for (int i = 0; i < children.size(); i++) |
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67 if ((cast(IFigure) children.get(i)).containsPoint(x, y)) |
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68 return true; |
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69 |
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70 return false; |
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71 } |
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72 |
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73 private int crossProduct(int ax, int ay, int bx, int by, int cx, int cy) { |
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74 return (ax - cx) * (by - cy) - (ay - cy) * (bx - cx); |
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75 } |
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76 |
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77 /** |
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78 * Fill the Polygon with the background color set by <i>g</i>. |
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79 * |
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80 * @param g the Graphics object |
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81 * @since 2.0 |
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82 */ |
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83 protected void fillShape(Graphics g) { |
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84 g.fillPolygon(getPoints()); |
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85 } |
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86 |
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87 /** |
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88 * Draw the outline of the Polygon. |
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89 * |
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90 * @param g the Graphics object |
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91 * @since 2.0 |
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92 */ |
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93 protected void outlineShape(Graphics g) { |
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94 g.drawPolygon(getPoints()); |
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95 } |
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96 |
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97 } |