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/*******************************************************************************
* Copyright (c) 2006, 2016 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.Pattern;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.graphics.Transform;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.Spinner;
/**
* This tab presents a spiral consisting of the number of petals specified.
* */
public class SpiralTab extends AnimatedGraphicsTab {
int angle; // angle by which to rotate the petals
Spinner petalSpinner; // spinner to control number of petals
Button colorButton;
GraphicsBackground foreground;
Menu menu;
public SpiralTab(GraphicsExample example) {
super(example);
angle = -90;
}
@Override
public void dispose() {
if (menu != null) {
menu.dispose();
menu = null;
}
}
/**
* This method creates a spinner for specifying the number of petals. The call to the
* createControlPanel method in the super class create the controls that are
* defined in the super class.
*
* @param parent The parent composite
*/
@Override
public void createControlPanel(Composite parent) {
super.createControlPanel(parent);
// create spinner number of petals
Composite comp = new Composite(parent, SWT.NONE);
comp.setLayout(new GridLayout(2, false));
new Label(comp, SWT.CENTER).setText(GraphicsExample
.getResourceString("Petals")); //$NON-NLS-1$
petalSpinner = new Spinner(comp, SWT.BORDER | SWT.WRAP);
petalSpinner.setSelection(8);
petalSpinner.setMinimum(3);
petalSpinner.setMaximum(20);
petalSpinner.addListener(SWT.Selection, event -> example.redraw());
// create color button
comp = new Composite(parent, SWT.NONE);
comp.setLayout(new GridLayout());
ColorMenu cm = new ColorMenu();
cm.setPatternItems(example.checkAdvancedGraphics());
menu = cm.createMenu(parent.getParent(), gb -> {
foreground = gb;
colorButton.setImage(gb.getThumbNail());
example.redraw();
});
// initialize the foreground to the 2nd item in the menu
foreground = (GraphicsBackground)menu.getItem(1).getData();
// color button
colorButton = new Button(comp, SWT.PUSH);
colorButton.setText(GraphicsExample
.getResourceString("Color")); //$NON-NLS-1$
colorButton.setImage(foreground.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 String getCategory() {
return GraphicsExample.getResourceString("Misc"); //$NON-NLS-1$
}
@Override
public String getText() {
return GraphicsExample.getResourceString("Spiral"); //$NON-NLS-1$
}
@Override
public String getDescription() {
return GraphicsExample.getResourceString("SpiralDescription"); //$NON-NLS-1$
}
@Override
public int getInitialAnimationTime() {
return 150;
}
@Override
public void next(int width, int height) {
if (angle == 270) {
angle = -90;
}
angle += 10;
}
@Override
public void paint(GC gc, int width, int height) {
if (!example.checkAdvancedGraphics()) return;
Device device = gc.getDevice();
// set line attributes
gc.setLineWidth(20);
gc.setLineCap(SWT.CAP_ROUND); // round line ends
gc.setAntialias(SWT.ON); // smooth jagged edges
Pattern pattern = null;
if (foreground.getBgColor1() != null) {
gc.setForeground(foreground.getBgColor1());
} else if (foreground.getBgImage() != null) {
pattern = new Pattern(device, foreground.getBgImage());
gc.setForegroundPattern(pattern);
}
// draw petals for the spiral
Transform transform;
int n = petalSpinner.getSelection();
for (int i=0; i < n; i++) {
transform = new Transform(device);
transform.translate(width/2, height/2);
transform.rotate(-(angle + 360/n * i));
gc.setTransform(transform);
gc.drawArc(0, 0, width/3, height/6, 0, 180);
transform.dispose();
}
if (pattern != null) pattern.dispose();
}
}
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