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/*******************************************************************************
* Copyright (c) 2006, 2016 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* 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.Label;
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 Combo clippingCb;
private Button colorButton;
private GraphicsBackground background;
private Menu menu;
public PathClippingTab(GraphicsExample example) {
super(example);
}
@Override
public String getCategory() {
return GraphicsExample.getResourceString("Clipping"); //$NON-NLS-1$
}
@Override
public String getText() {
return GraphicsExample.getResourceString("PathClipping"); //$NON-NLS-1$
}
@Override
public String getDescription() {
return GraphicsExample.getResourceString("PathClippingDesc"); //$NON-NLS-1$
}
@Override
public void dispose() {
if (menu != null) {
menu.dispose();
menu = 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("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, event -> example.redraw());
// color menu
ColorMenu cm = new ColorMenu();
cm.setPatternItems(example.checkAdvancedGraphics());
menu = cm.createMenu(parent.getParent(), 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, event -> {
final Button button = (Button) event.widget;
final Composite parent1 = button.getParent();
Rectangle bounds = button.getBounds();
Point point = parent1.toDisplay(new Point(bounds.x, bounds.y));
menu.setLocation(point.x, point.y + bounds.height);
menu.setVisible(true);
});
}
@Override
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();
}
}
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