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
93
94
95
96
97
98
99
100
101
102
103
104
105
|
/*******************************************************************************
* Copyright (c) 2010 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.swt.snippets;
/*
* Gesture example
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.7
*/
import org.eclipse.swt.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;
public class Snippet353 {
static Point origin, size;
static double rotation, currentRotation;
static float magnification = 1.0f, currentMagnification;
public static void main(String [] args) {
Display display = new Display();
final Shell shell = new Shell(display);
GestureListener gl = new GestureListener() {
public void gesture(GestureEvent ge) {
if (ge.detail == SWT.GESTURE_BEGIN) {
currentRotation = rotation;
currentMagnification = magnification;
}
if (ge.detail == SWT.GESTURE_ROTATE) {
rotation = currentRotation - ge.rotation;
shell.redraw();
}
if (ge.detail == SWT.GESTURE_MAGNIFY) {
magnification = (float) (currentMagnification * ge.magnification);
shell.redraw();
}
if (ge.detail == SWT.GESTURE_SWIPE) {
// xDirection and yDirection indicate direction for GESTURE_SWIPE.
// For this example, just move in that direction to demonstrate it's working.
origin.x += ge.xDirection * 50;
origin.y += ge.yDirection * 50;
shell.redraw();
}
if (ge.detail == SWT.GESTURE_PAN) {
origin.x += ge.xDirection;
origin.y += ge.yDirection;
shell.redraw();
}
if (ge.detail == SWT.GESTURE_END) {
}
}
};
PaintListener pl = new PaintListener() {
public void paintControl(PaintEvent e) {
Transform t = new Transform(Display.getCurrent());
t.translate(origin.x, origin.y);
t.translate(size.x / 2, size.y / 2);
t.rotate((float) rotation);
t.translate(-size.x / 2, -size.y / 2);
t.translate(-origin.x, -origin.y);
e.gc.setAntialias(SWT.ON);
e.gc.setTransform(t);
// Because of bug 253670, drawRectangle is incorrect when the rotation is near 45, 135, 225 or 315 degrees.
// Uncomment this next line and adjust the bitfield for your platform. See GC#DRAW_OFFSET.
//e.gc.getGCData().state |= 1 << 9;
e.gc.drawRectangle(origin.x, origin.y, (int)(size.x * magnification), (int)(size.y * magnification));
t.dispose();
}
};
shell.addPaintListener(pl);
shell.addGestureListener(gl);
shell.setSize(400, 400);
size = new Point(50, 50);
origin = new Point((shell.getSize().x - size.x) / 2, (shell.getSize().y - size.y) / 2);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose();
}
}
|
