1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/*******************************************************************************
* Copyright (c) 2000, 2008 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.text.source;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.FontMetrics;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Canvas;
/**
* Provides methods for drawing images onto a canvas.
* <p>
* This class is neither intended to be instantiated nor subclassed.
* </p>
*
* @since 3.0
* @noinstantiate This class is not intended to be instantiated by clients.
* @noextend This class is not intended to be subclassed by clients.
*/
public class ImageUtilities {
/**
* Draws an image aligned inside the given rectangle on the given canvas.
*
* @param image the image to be drawn
* @param gc the drawing GC
* @param canvas the canvas on which to draw
* @param r the clipping rectangle
* @param halign the horizontal alignment of the image to be drawn
* @param valign the vertical alignment of the image to be drawn
*/
public static void drawImage(Image image, GC gc, Canvas canvas, Rectangle r, int halign, int valign) {
if (image != null) {
Rectangle bounds= image.getBounds();
int x= 0;
switch(halign) {
case SWT.LEFT:
break;
case SWT.CENTER:
x= (r.width - bounds.width) / 2;
break;
case SWT.RIGHT:
x= r.width - bounds.width;
break;
}
int y= 0;
switch (valign) {
case SWT.TOP: {
FontMetrics fontMetrics= gc.getFontMetrics();
y= (fontMetrics.getHeight() - bounds.height)/2;
break;
}
case SWT.CENTER:
y= (r.height - bounds.height) / 2;
break;
case SWT.BOTTOM: {
FontMetrics fontMetrics= gc.getFontMetrics();
y= r.height - (fontMetrics.getHeight() + bounds.height)/2;
break;
}
}
gc.drawImage(image, r.x+x, r.y+y);
}
}
/**
* Draws an image aligned inside the given rectangle on the given canvas.
*
* @param image the image to be drawn
* @param gc the drawing GC
* @param canvas the canvas on which to draw
* @param r the clipping rectangle
* @param align the alignment of the image to be drawn
*/
public static void drawImage(Image image, GC gc, Canvas canvas, Rectangle r, int align) {
drawImage(image, gc, canvas, r, align, SWT.CENTER);
}
}
|
