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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.GC;
import org.eclipse.swt.graphics.Path;
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 antialiasing for graphics. Antialiasing is used for
* smoothing jagged edges in graphics. This tab allows the user to see the
* effects of different antialiasing values.
*/
public class GraphicAntialiasTab extends GraphicsTab {
Combo aliasCombo;
int[] aliasValues = { SWT.OFF, SWT.DEFAULT, SWT.ON };
Button colorButton;
Menu menu;
GraphicsBackground ovalColorGB;
public GraphicAntialiasTab(GraphicsExample example) {
super(example);
}
@Override
public String getCategory() {
return GraphicsExample.getResourceString("Antialiasing"); //$NON-NLS-1$
}
@Override
public String getText() {
return GraphicsExample.getResourceString("Graphics"); //$NON-NLS-1$
}
@Override
public String getDescription() {
return GraphicsExample.getResourceString("AntialiasingGraphicsDesc"); //$NON-NLS-1$
}
@Override
public void dispose() {
if (menu != null) {
menu.dispose();
menu = null;
}
}
@Override
public void createControlPanel(Composite parent) {
Composite comp;
// create drop down combo for antialiasing
comp = new Composite(parent, SWT.NONE);
comp.setLayout(new GridLayout(2, false));
new Label(comp, SWT.CENTER).setText(GraphicsExample
.getResourceString("Antialiasing")); //$NON-NLS-1$
aliasCombo = new Combo(comp, SWT.DROP_DOWN);
aliasCombo.add("OFF");
aliasCombo.add("DEFAULT");
aliasCombo.add("ON");
aliasCombo.select(0);
aliasCombo.addListener(SWT.Selection, event -> example.redraw());
ColorMenu cm = new ColorMenu();
cm.setColorItems(true);
menu = cm.createMenu(parent.getParent(), gb -> {
ovalColorGB = gb;
colorButton.setImage(gb.getThumbNail());
example.redraw();
});
// create color button
comp = new Composite(parent, SWT.NONE);
comp.setLayout(new GridLayout());
// initialize the background to the 5th item in the menu (blue)
ovalColorGB = (GraphicsBackground)menu.getItem(4).getData();
// color button
colorButton = new Button(comp, SWT.PUSH);
colorButton.setText(GraphicsExample.getResourceString("Color")); //$NON-NLS-1$
colorButton.setImage(ovalColorGB.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();
if (ovalColorGB != null && ovalColorGB.getBgColor1() != null)
gc.setBackground(ovalColorGB.getBgColor1());
gc.setAntialias(aliasValues[aliasCombo.getSelectionIndex()]);
Path path = new Path(device);
float offsetX = 2*width/3f, offsetY = height/3f;
for(int i=0; i < 25; i++) {
path.addArc(offsetX-(50*i), offsetY-(25*i), 50+(100*i), 25+(50*i), 0, 360);
}
gc.fillPath(path);
path.dispose();
}
}
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