/*******************************************************************************
* 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.Font;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Path;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Transform;
import org.eclipse.swt.layout.GridLayout;
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.Spinner;
/**
* This tab presents a count down from 5 to 1, then displays SWT.
*/
public class CountDownTab extends AnimatedGraphicsTab {
/**
* Returns the name of a valid font for the resident platform.
*
* @param index
* index is used to determine the appropriate font face
*/
static String getPlatformFontFace(int index) {
if (SWT.getPlatform() == "win32")
return new String[] { "Courier", "Impact" }[index];
else if (SWT.getPlatform() == "motif")
return new String[] { "Courier", "URW Gothic L" }[index];
else if (SWT.getPlatform() == "gtk")
return new String[] { "Courier", "Baekmuk Headline" }[index];
else if (SWT.getPlatform() == "carbon")
return new String[] { "Courier", "Impact" }[index];
else
return new String[] { "Courier", "Verdana" }[index];
}
Combo aliasCombo, lineCapCombo; // combo
// for
// alias
// type
// and
// line
// cap
int[] aliasValues = { SWT.DEFAULT, SWT.OFF, SWT.ON };
int angle = -90; // angle used to rotate the bar
int antialias, lineCap; // antialias and linecap values
int[] capValues = { SWT.CAP_FLAT, SWT.CAP_SQUARE, SWT.CAP_ROUND };
Spinner lineWidthSpinner; // spinner for line width
// countdown
final int startNumber = 5; // number at which to start the
int nextNumber = startNumber; // next number to be displayed
/**
* Constructor
*
* @param example
* A GraphicsExample
*/
public CountDownTab(GraphicsExample example) {
super(example);
}
/**
* This method creates the controls specific to the tab. 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);
if (nextNumber < 1)
nextNumber = startNumber;
// add selection listener to reset nextNumber after
// the sequence has completed
playItem.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
if (nextNumber < 1)
nextNumber = startNumber;
}
});
Composite comp;
GridLayout gridLayout = new GridLayout(2, false);
// create spinner for line width
comp = new Composite(parent, SWT.NONE);
comp.setLayout(gridLayout);
new Label(comp, SWT.CENTER).setText(GraphicsExample.getResourceString("LineWidth")); //$NON-NLS-1$
lineWidthSpinner = new Spinner(comp, SWT.BORDER | SWT.WRAP);
lineWidthSpinner.setSelection(20);
lineWidthSpinner.setMinimum(1);
lineWidthSpinner.setMaximum(100);
lineWidthSpinner.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
if (!pauseItem.isEnabled())
example.redraw();
}
});
// create drop down combo for antialiasing
comp = new Composite(parent, SWT.NONE);
comp.setLayout(gridLayout);
new Label(comp, SWT.CENTER).setText(GraphicsExample.getResourceString("Antialiasing")); //$NON-NLS-1$
aliasCombo = new Combo(comp, SWT.DROP_DOWN);
aliasCombo.add("DEFAULT");
aliasCombo.add("OFF");
aliasCombo.add("ON");
aliasCombo.select(0);
antialias = aliasValues[0];
aliasCombo.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
antialias = aliasValues[aliasCombo.getSelectionIndex()];
if (!pauseItem.isEnabled())
example.redraw();
}
});
// create drop down combo for line cap
comp = new Composite(parent, SWT.NONE);
comp.setLayout(gridLayout);
new Label(comp, SWT.CENTER).setText(GraphicsExample.getResourceString("LineCap")); //$NON-NLS-1$
lineCapCombo = new Combo(comp, SWT.DROP_DOWN);
lineCapCombo.add("FLAT");
lineCapCombo.add("SQUARE");
lineCapCombo.add("ROUND");
lineCapCombo.select(0);
lineCap = capValues[0];
lineCapCombo.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
lineCap = capValues[lineCapCombo.getSelectionIndex()];
if (!pauseItem.isEnabled())
example.redraw();
}
});
}
public String getCategory() {
return GraphicsExample.getResourceString("Misc"); //$NON-NLS-1$
}
public String getDescription() {
return GraphicsExample.getResourceString("CountdownDescription"); //$NON-NLS-1$
}
/*
* (non-Javadoc)
*
* @see org.eclipse.swt.examples.graphics.AnimatedGraphicsTab#getAnimationTime()
*/
public int getInitialAnimationTime() {
return 28;
}
public String getText() {
return GraphicsExample.getResourceString("Countdown"); //$NON-NLS-1$
}
/*
* (non-Javadoc)
*
* @see org.eclipse.swt.examples.graphics.AnimatedGraphicsTab#next(int, int)
*/
public void next(int width, int height) {
if (angle == 270) {
nextNumber--;
if (nextNumber < 1)
// stop animation
setAnimation(false);
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();
// diameter of the circle in pixels
int diameter = width < height ? width - 25 : height - 25;
if (!getAnimation() && nextNumber == 0) {
Font font = new Font(device, CountDownTab.getPlatformFontFace(1), diameter / 2, SWT.NONE);
gc.setFont(font);
// display "SWT"
gc.setForeground(device.getSystemColor(SWT.COLOR_DARK_BLUE));
gc.setTextAntialias(SWT.ON);
// determine the dimensions of the word
String text = GraphicsExample.getResourceString("SWT");
Point point = gc.stringExtent(text);
int textWidth = point.x;
int textHeight = point.y;
gc.drawString(text, (width - textWidth) / 2, (height - textHeight) / 2, true);
font.dispose();
} else {
Font font = new Font(device, CountDownTab.getPlatformFontFace(0), 6 * diameter / 10, SWT.NONE);
gc.setFont(font);
// set attributes from controls
gc.setLineWidth(lineWidthSpinner.getSelection());
gc.setLineCap(lineCap); // round line ends
gc.setAntialias(antialias); // smooth jagged edges
gc.setTextAntialias(antialias); // smooth jagged edges
// draw the circles
Path path = new Path(device);
path.addArc((width - diameter) / 2, (height - diameter) / 2, diameter, diameter, 0, 360);
path
.addArc((width - diameter + 50) / 2, (height - diameter + 50) / 2, diameter - 50, diameter - 50, 0,
360);
gc.drawPath(path);
gc.setBackground(device.getSystemColor(SWT.COLOR_RED));
gc.fillPath(path);
path.dispose();
Point point = gc.stringExtent(Integer.toString(nextNumber));
int textWidth = point.x;
int textHeight = point.y;
// draw the number
gc.drawString(Integer.toString(nextNumber), (width - textWidth) / 2, (height - textHeight) / 2, true);
// draw the rotating arm
Transform transform = new Transform(device);
transform.translate(width / 2, height / 2);
transform.rotate(angle);
gc.setTransform(transform);
gc.setForeground(device.getSystemColor(SWT.COLOR_RED));
gc.drawLine(0, 0, diameter / 2, 0);
transform.dispose();
font.dispose();
}
}
}