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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 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 dwtx.jface.text.source.ImageUtilities;
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14
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15 import dwt.dwthelper.utils;
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16
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17 import dwt.DWT;
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18 import dwt.graphics.FontMetrics;
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19 import dwt.graphics.GC;
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20 import dwt.graphics.Image;
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21 import dwt.graphics.Rectangle;
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22 import dwt.widgets.Canvas;
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23
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24 /**
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25 * Provides methods for drawing images onto a canvas.
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26 * <p>
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27 * This class is neither intended to be instantiated nor subclassed.
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28 * </p>
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29 *
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30 * @since 3.0
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31 * @noinstantiate This class is not intended to be instantiated by clients.
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32 * @noextend This class is not intended to be subclassed by clients.
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33 */
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34 public class ImageUtilities {
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35
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36 /**
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37 * Draws an image aligned inside the given rectangle on the given canvas.
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38 *
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39 * @param image the image to be drawn
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40 * @param gc the drawing GC
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41 * @param canvas the canvas on which to draw
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42 * @param r the clipping rectangle
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43 * @param halign the horizontal alignment of the image to be drawn
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44 * @param valign the vertical alignment of the image to be drawn
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45 */
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46 public static void drawImage(Image image, GC gc, Canvas canvas, Rectangle r, int halign, int valign) {
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47 if (image !is null) {
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48
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49 Rectangle bounds= image.getBounds();
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50
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51 int x= 0;
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52 switch(halign) {
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53 case DWT.LEFT:
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54 break;
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55 case DWT.CENTER:
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56 x= (r.width - bounds.width) / 2;
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57 break;
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58 case DWT.RIGHT:
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59 x= r.width - bounds.width;
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60 break;
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61 }
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62
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63 int y= 0;
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64 switch (valign) {
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65 case DWT.TOP: {
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66 FontMetrics fontMetrics= gc.getFontMetrics();
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67 y= (fontMetrics.getHeight() - bounds.height)/2;
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68 break;
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69 }
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70 case DWT.CENTER:
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71 y= (r.height - bounds.height) / 2;
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72 break;
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73 case DWT.BOTTOM: {
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74 FontMetrics fontMetrics= gc.getFontMetrics();
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75 y= r.height - (fontMetrics.getHeight() + bounds.height)/2;
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76 break;
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77 }
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78 }
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79
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80 gc.drawImage(image, r.x+x, r.y+y);
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81 }
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82 }
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83
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84 /**
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85 * Draws an image aligned inside the given rectangle on the given canvas.
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86 *
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87 * @param image the image to be drawn
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88 * @param gc the drawing GC
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89 * @param canvas the canvas on which to draw
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90 * @param r the clipping rectangle
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91 * @param align the alignment of the image to be drawn
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92 */
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93 public static void drawImage(Image image, GC gc, Canvas canvas, Rectangle r, int align) {
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94 drawImage(image, gc, canvas, r, align, DWT.CENTER);
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95 }
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96 }
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