| /******************************************************************************* |
| * 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.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.layout.*; |
| import org.eclipse.swt.widgets.*; |
| |
| /** |
| * 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; |
| } |
| |
| 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 |
| */ |
| 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, new Listener() { |
| public void handleEvent (Event 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(), new ColorListener() { |
| public void setColor(GraphicsBackground 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, 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 String getCategory() { |
| return GraphicsExample.getResourceString("Misc"); //$NON-NLS-1$ |
| } |
| |
| public String getText() { |
| return GraphicsExample.getResourceString("Spiral"); //$NON-NLS-1$ |
| } |
| |
| public String getDescription() { |
| return GraphicsExample.getResourceString("SpiralDescription"); //$NON-NLS-1$ |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.swt.examples.graphics.AnimatedGraphicsTab#getAnimationTime() |
| */ |
| public int getInitialAnimationTime() { |
| return 150; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.swt.examples.graphics.AnimatedGraphicsTab#next(int, int) |
| */ |
| public void next(int width, int height) { |
| if (angle == 270) { |
| angle = -90; |
| } |
| angle += 10; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.swt.examples.graphics.GraphicsTab#paint(org.eclipse.swt.graphics.GC, int, int) |
| */ |
| 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(); |
| } |
| } |