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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/geometry/Transform.d @ 16:dbfb303e8fb0

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first complete successful compile (win-only)
author Frank Benoit <benoit@tionex.de>
date Wed, 18 Mar 2009 08:56:47 +0100
parents bc29606a740c
children
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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 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module org.eclipse.draw2d.geometry.Transform;
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15 import java.lang.all;
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16 import org.eclipse.draw2d.geometry.Point;
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18 /**
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19 * Provides support for transformations of scaling, translation and rotation.
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20 */
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21 public class Transform {
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23 private double
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24 scaleX = 1.0,
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25 scaleY = 1.0,
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26 dx, dy,
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27 cos = 1.0,
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28 sin;
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29
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30 /**
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31 * Sets the value for the amount of scaling to be done along both axes.
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32 *
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33 * @param scale Scale factor
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34 * @since 2.0
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35 */
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36 public void setScale(double scale) {
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37 scaleX = scaleY = scale;
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38 }
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39
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40 /**
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41 * Sets the value for the amount of scaling to be done along X and Y axes
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42 * individually.
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43 *
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44 * @param x Amount of scaling on X axis
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45 * @param y Amount of scaling on Y axis
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46 * @since 2.0
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47 */
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48 public void setScale(double x, double y) {
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49 scaleX = x;
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50 scaleY = y;
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51 }
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52
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53 /**
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54 * Sets the rotation angle.
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55 *
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56 * @param angle Angle of rotation
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57 * @since 2.0
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58 */
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59 public void setRotation(double angle) {
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60 cos = Math.cos(angle);
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61 sin = Math.sin(angle);
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62 }
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63
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64 /**
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65 * Sets the translation amounts for both axes.
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66 *
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67 * @param x Amount of shift on X axis
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68 * @param y Amount of shift on Y axis
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69 * @since 2.0
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70 */
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71 public void setTranslation(double x, double y) {
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72 dx = x;
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73 dy = y;
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74 }
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75
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76 /**
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77 * Returns a new transformed Point of the input Point based on the transformation
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78 * values set.
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79 *
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80 * @param p Point being transformed
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81 * @return The transformed Point
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82 * @since 2.0
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83 */
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84 public Point getTransformed(Point p) {
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85 double x = p.x;
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86 double y = p.y;
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87 double temp;
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88 x *= scaleX;
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89 y *= scaleY;
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90
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91 temp = x * cos - y * sin;
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92 y = x * sin + y * cos;
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93 x = temp;
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94 return new Point(cast(double)Math.round(x + dx), cast(double)Math.round(y + dy));
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95 }
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96
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97 }