/*******************************************************************************
* Copyright (c) 2006 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.examples.graphics;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Device;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Path;
import org.eclipse.swt.graphics.Pattern;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Menu;
/**
* This tab demonstrates how to apply a path clipping and the effects of applying one.
*/
public class PathClippingTab extends GraphicsTab {
private GraphicsBackground background;
private Combo clippingCb;
private Button colorButton;
private Menu menu;
public PathClippingTab(GraphicsExample example) {
super(example);
}
/**
* Creates the widgets used to control the drawing.
*/
public void createControlPanel(Composite parent) {
// create drop down combo for choosing clipping
Composite comp = new Composite(parent, SWT.NONE);
comp.setLayout(new GridLayout(2, false));
new Label(comp, SWT.CENTER).setText(GraphicsExample.getResourceString("Clipping")); //$NON-NLS-1$
clippingCb = new Combo(comp, SWT.DROP_DOWN);
clippingCb.add(GraphicsExample.getResourceString("Circles")); //$NON-NLS-1$
clippingCb.add(GraphicsExample.getResourceString("Rectangle")); //$NON-NLS-1$
clippingCb.add(GraphicsExample.getResourceString("Oval")); //$NON-NLS-1$
clippingCb.add(GraphicsExample.getResourceString("Word")); //$NON-NLS-1$
clippingCb.add(GraphicsExample.getResourceString("Star")); //$NON-NLS-1$
clippingCb.add(GraphicsExample.getResourceString("Triangles")); //$NON-NLS-1$
clippingCb.add(GraphicsExample.getResourceString("Default")); //$NON-NLS-1$
clippingCb.select(0);
clippingCb.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
example.redraw();
}
});
// color menu
ColorMenu cm = new ColorMenu();
cm.setPatternItems(example.checkAdvancedGraphics());
menu = cm.createMenu(parent.getParent(), new ColorListener() {
public void setColor(GraphicsBackground gb) {
background = gb;
colorButton.setImage(gb.getThumbNail());
example.redraw();
}
});
// initialize the background to the 5th item in the menu (blue)
background = (GraphicsBackground) menu.getItem(4).getData();
// color button
comp = new Composite(parent, SWT.NONE);
comp.setLayout(new GridLayout(2, false));
colorButton = new Button(comp, SWT.PUSH);
colorButton.setText(GraphicsExample.getResourceString("Color")); //$NON-NLS-1$
colorButton.setImage(background.getThumbNail());
colorButton.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
final Button button = (Button) event.widget;
final Composite parent = button.getParent();
Rectangle bounds = button.getBounds();
Point point = parent.toDisplay(new Point(bounds.x, bounds.y));
menu.setLocation(point.x, point.y + bounds.height);
menu.setVisible(true);
}
});
}
public void dispose() {
if (menu != null) {
menu.dispose();
menu = null;
}
}
public String getCategory() {
return GraphicsExample.getResourceString("Clipping"); //$NON-NLS-1$
}
public String getDescription() {
return GraphicsExample.getResourceString("PathClippingDesc"); //$NON-NLS-1$
}
public String getText() {
return GraphicsExample.getResourceString("PathClipping"); //$NON-NLS-1$
}
public void paint(GC gc, int width, int height) {
if (!example.checkAdvancedGraphics())
return;
Device device = gc.getDevice();
int clipping = clippingCb.getSelectionIndex();
switch (clipping) {
case 0: // circles
Path path = new Path(device);
path.addArc((width - width / 5) / 2, (height - height / 5) / 2, width / 5, height / 5, 0, 360);
path.addArc(5 * (width - width / 8) / 12, 4 * (height - height / 8) / 12, width / 8, height / 8, 0, 360);
path.addArc(7 * (width - width / 8) / 12, 8 * (height - height / 8) / 12, width / 8, height / 8, 0, 360);
path
.addArc(6 * (width - width / 12) / 12, 3 * (height - height / 12) / 12, width / 12, height / 12, 0,
360);
path
.addArc(6 * (width - width / 12) / 12, 9 * (height - height / 12) / 12, width / 12, height / 12, 0,
360);
path.addArc(11.5f * (width - width / 18) / 20, 5 * (height - height / 18) / 18, width / 18, height / 18, 0,
360);
path.addArc(8.5f * (width - width / 18) / 20, 13 * (height - height / 18) / 18, width / 18, height / 18, 0,
360);
gc.setClipping(path);
path.dispose();
break;
case 1: // rectangle
path = new Path(device);
path.addRectangle(100, 100, width - 200, height - 200);
path.addRectangle(120, 120, width - 240, height - 240);
path.addRectangle(140, 140, width - 280, height - 280);
gc.setClipping(path);
path.dispose();
break;
case 2: // circle
path = new Path(device);
path.addArc(100, 100, width - 200, height - 200, 0, 360);
path.addArc((width - width / 5) / 2, (height - height / 5) / 2, width / 5, height / 5, 0, 360);
path.addArc(5 * (width - width / 8) / 12, 4 * (height - height / 8) / 12, width / 8, height / 8, 0, 360);
path.addArc(7 * (width - width / 8) / 12, 8 * (height - height / 8) / 12, width / 8, height / 8, 0, 360);
path
.addArc(6 * (width - width / 12) / 12, 3 * (height - height / 12) / 12, width / 12, height / 12, 0,
360);
path
.addArc(6 * (width - width / 12) / 12, 9 * (height - height / 12) / 12, width / 12, height / 12, 0,
360);
path.addArc(11.5f * (width - width / 18) / 20, 5 * (height - height / 18) / 18, width / 18, height / 18, 0,
360);
path.addArc(8.5f * (width - width / 18) / 20, 13 * (height - height / 18) / 18, width / 18, height / 18, 0,
360);
gc.setClipping(path);
path.dispose();
break;
case 3: // word
path = new Path(device);
String text = GraphicsExample.getResourceString("SWT"); //$NON-NLS-1$
Font font = new Font(device, "Times", 200, SWT.NORMAL);
gc.setFont(font);
Point size = gc.stringExtent(text);
path.addString(text, (width - size.x) / 2, (height - size.y) / 2, font);
font.dispose();
gc.setClipping(path);
path.dispose();
break;
case 4: // star
path = new Path(device);
path.lineTo(width / 2, 0);
path.lineTo(5 * width / 8, height / 3);
path.lineTo(width, height / 3);
path.lineTo(3 * width / 4, 10 * height / 16);
path.lineTo(7 * width / 8, height);
path.lineTo(width / 2, 3 * height / 4);
path.lineTo(width / 8, height);
path.lineTo(width / 4, 10 * height / 16);
path.lineTo(0, height / 3);
path.lineTo(3 * width / 8, height / 3);
path.lineTo(width / 2, 0);
Path ovalPath = new Path(device);
ovalPath.addArc(90, 90, width - 180, height - 180, 0, 360);
path.addPath(ovalPath);
gc.setClipping(path);
ovalPath.dispose();
path.dispose();
break;
case 5: // triangles
path = new Path(device);
path.addRectangle(0, 0, width, height);
path.lineTo(width / 4, 0);
path.lineTo(width / 4, height / 2);
path.lineTo(0, height / 2);
path.lineTo(width / 4, 0);
Path path2 = new Path(device);
path2.lineTo(width / 2, 0);
path2.lineTo(width / 4, height / 2);
path2.lineTo(3 * width / 4, height / 2);
path2.lineTo(width / 2, 0);
Path path3 = new Path(device);
path3.lineTo(3 * width / 4, 0);
path3.lineTo(3 * width / 4, height / 2);
path3.lineTo(width, height / 2);
path3.lineTo(3 * width / 4, 0);
Path path4 = new Path(device);
path4.lineTo(0, height);
path4.lineTo(width / 4, height / 2);
path4.lineTo(width / 2, height);
path4.lineTo(0, height);
Path path5 = new Path(device);
path5.lineTo(width / 2, height);
path5.lineTo(3 * width / 4, height / 2);
path5.lineTo(width, height);
path5.lineTo(width / 2, height);
path.addPath(path2);
path.addPath(path3);
path.addPath(path4);
path.addPath(path5);
gc.setClipping(path);
path5.dispose();
path4.dispose();
path3.dispose();
path2.dispose();
path.dispose();
break;
case 6: // default
gc.setClipping(0, 0, width, height);
break;
}
Pattern pattern = null;
if (background.getBgColor1() != null)
gc.setBackground(background.getBgColor1());
else if (background.getBgImage() != null) {
pattern = new Pattern(device, background.getBgImage());
gc.setBackgroundPattern(pattern);
}
gc.fillRectangle(0, 0, width, height);
if (pattern != null)
pattern.dispose();
}
}