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Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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children dbfb303e8fb0
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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;
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17 import org.eclipse.draw2d.Polyline;
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18 import org.eclipse.draw2d.Graphics;
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19 import org.eclipse.draw2d.IFigure;
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20
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21 /**
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22 * Renders a {@link org.eclipse.draw2d.geometry.PointList} as a polygonal shape.
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23 * This class is similar to Polyline, except the PointList is closed and can be filled in
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24 * as a solid shape.
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25 * @see Polyline
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26 */
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27 public class Polygon
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28 : Polyline
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29 {
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30
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31 /**
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32 * Returns whether the point (x,y) is contained inside this polygon.
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33 * @param x the X coordinate
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34 * @param y the Y coordinate
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35 * @return whether the point (x,y) is contained in this polygon
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36 */
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37 public bool containsPoint(int x, int y) {
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38 if (!getBounds().contains(x, y))
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39 return false;
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40
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41 bool isOdd = false;
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42 int[] pointsxy = getPoints().toIntArray();
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43 int n = pointsxy.length;
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44 if (n > 3) { //If there are at least 2 Points (4 ints)
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45 int x1, y1;
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46 int x0 = pointsxy[n - 2];
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47 int y0 = pointsxy[n - 1];
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48
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49 for (int i = 0; i < n; x0 = x1, y0 = y1) {
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50 x1 = pointsxy[i++];
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51 y1 = pointsxy[i++];
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52
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53 if (y0 <= y && y < y1
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54 && crossProduct(x1, y1, x0, y0, x, y) > 0)
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55 isOdd = !isOdd;
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56 if (y1 <= y && y < y0
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57 && crossProduct(x0, y0, x1, y1, x, y) > 0)
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58 isOdd = !isOdd;
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59 }
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60 if (isOdd)
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61 return true;
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62 }
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63
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64 List children = getChildren();
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65 for (int i = 0; i < children.size(); i++)
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66 if ((cast(IFigure) children.get(i)).containsPoint(x, y))
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67 return true;
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68
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69 return false;
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70 }
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71
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72 private int crossProduct(int ax, int ay, int bx, int by, int cx, int cy) {
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73 return (ax - cx) * (by - cy) - (ay - cy) * (bx - cx);
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74 }
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75
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76 /**
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77 * Fill the Polygon with the background color set by <i>g</i>.
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78 *
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79 * @param g the Graphics object
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80 * @since 2.0
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81 */
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82 protected void fillShape(Graphics g) {
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83 g.fillPolygon(getPoints());
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84 }
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85
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86 /**
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87 * Draw the outline of the Polygon.
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88 *
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89 * @param g the Graphics object
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90 * @since 2.0
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91 */
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92 protected void outlineShape(Graphics g) {
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93 g.drawPolygon(getPoints());
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94 }
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95
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96 }