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/*******************************************************************************
* 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.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.graphics.Region;
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 region clipping and the effects of
* applying one.
*/
public class RegionClippingTab extends GraphicsTab {
private Combo clippingCb;
private Button colorButton1, colorButton2;
private Menu menu1, menu2;
private GraphicsBackground colorGB1, colorGB2;
public RegionClippingTab(GraphicsExample example) {
super(example);
}
@Override
public String getCategory() {
return GraphicsExample.getResourceString("Clipping"); //$NON-NLS-1$
}
@Override
public String getText() {
return GraphicsExample.getResourceString("RegionClipping"); //$NON-NLS-1$
}
@Override
public String getDescription() {
return GraphicsExample.getResourceString("RegionClippingDescription"); //$NON-NLS-1$
}
@Override
public void dispose() {
if (menu1 != null) {
menu1.dispose();
menu1 = null;
}
if (menu2 != null) {
menu2.dispose();
menu2 = null;
}
}
/**
* Creates the widgets used to control the drawing.
*/
@Override
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("Region1")); //$NON-NLS-1$
clippingCb.add(GraphicsExample.getResourceString("Region2")); //$NON-NLS-1$
clippingCb.add(GraphicsExample.getResourceString("Add")); //$NON-NLS-1$
clippingCb.add(GraphicsExample.getResourceString("Sub")); //$NON-NLS-1$
clippingCb.add(GraphicsExample.getResourceString("Inter")); //$NON-NLS-1$
clippingCb.select(0);
clippingCb.addListener(SWT.Selection, new Listener() {
@Override
public void handleEvent(Event event) {
example.redraw();
}
});
// color menu
ColorMenu cm = new ColorMenu();
menu1 = cm.createMenu(parent.getParent(), new ColorListener() {
@Override
public void setColor(GraphicsBackground gb) {
colorGB1 = gb;
colorButton1.setImage(gb.getThumbNail());
example.redraw();
}
});
menu2 = cm.createMenu(parent.getParent(), new ColorListener() {
@Override
public void setColor(GraphicsBackground gb) {
colorGB2 = gb;
colorButton2.setImage(gb.getThumbNail());
example.redraw();
}
});
// initialize the color to blue
colorGB1 = (GraphicsBackground)menu1.getItem(4).getData();
// initialize the color to red
colorGB2 = (GraphicsBackground)menu2.getItem(2).getData();
// color button 1
comp = new Composite(parent, SWT.NONE);
comp.setLayout(new GridLayout(2, false));
colorButton1 = new Button(comp, SWT.PUSH);
colorButton1.setText(GraphicsExample
.getResourceString("Color1")); //$NON-NLS-1$
colorButton1.setImage(colorGB1.getThumbNail());
colorButton1.addListener(SWT.Selection, new Listener() {
@Override
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));
menu1.setLocation(point.x, point.y + bounds.height);
menu1.setVisible(true);
}
});
// color button 2
comp = new Composite(parent, SWT.NONE);
comp.setLayout(new GridLayout(2, false));
colorButton2 = new Button(comp, SWT.PUSH);
colorButton2.setText(GraphicsExample
.getResourceString("Color2")); //$NON-NLS-1$
colorButton2.setImage(colorGB2.getThumbNail());
colorButton2.addListener(SWT.Selection, new Listener() {
@Override
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));
menu2.setLocation(point.x, point.y + bounds.height);
menu2.setVisible(true);
}
});
}
@Override
public void paint(GC gc, int width, int height) {
if (!example.checkAdvancedGraphics()) return;
Device device = gc.getDevice();
// array of coordinate points of polygon 1 (region 1)
int [] polygon1 = new int [] {10, height/2, 9*width/16, 10, 9*width/16, height-10};
Region region1 = new Region(device);
region1.add(polygon1);
// array of coordinate points of polygon 2 (region 2)
int [] polygon2 = new int [] {
9*width/16, 10,
9*width/16, height/8,
7*width/16, 2*height/8,
9*width/16, 3*height/8,
7*width/16, 4*height/8,
9*width/16, 5*height/8,
7*width/16, 6*height/8,
9*width/16, 7*height/8,
9*width/16, height-10,
width-10, height/2
};
Region region2 = new Region(device);
region2.add(polygon2);
gc.setAlpha(127);
int clippingIndex = clippingCb.getSelectionIndex();
switch (clippingIndex) {
case 0:
// region 1
gc.setClipping(region1);
gc.setBackground(colorGB1.getBgColor1());
gc.fillPolygon(polygon1);
break;
case 1:
// region 2
gc.setClipping(region2);
gc.setBackground(colorGB2.getBgColor1());
gc.fillPolygon(polygon2);
break;
case 2:
// add
region1.add(region2);
break;
case 3:
// sub
region1.subtract(region2);
break;
case 4:
// intersect
region1.intersect(region2);
break;
}
if (clippingIndex > 1) {
gc.setClipping(region1);
gc.setBackground(colorGB1.getBgColor1());
gc.fillPolygon(polygon1);
gc.setBackground(colorGB2.getBgColor1());
gc.fillPolygon(polygon2);
}
region1.dispose();
region2.dispose();
}
}
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