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/*******************************************************************************
* 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 demonstrates transformations, such as scaling, rotation, and
* invert. It allows the user to specify values for scaling and rotation.
*/
public class ImageTransformTab extends GraphicsTab {
private Spinner rotateSpinner, translateSpinnerX, translateSpinnerY, scaleSpinnerX, scaleSpinnerY;
private Button invertButton;
/**
* Constructor
* @param example A GraphicsExample
*/
public ImageTransformTab(GraphicsExample example) {
super(example);
}
@Override
public String getCategory() {
return GraphicsExample.getResourceString("Transform"); //$NON-NLS-1$
}
@Override
public String getText() {
return GraphicsExample.getResourceString("Image"); //$NON-NLS-1$
}
@Override
public String getDescription() {
return GraphicsExample.getResourceString("TransformImgDescription"); //$NON-NLS-1$
}
/**
* 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
*/
@Override
public void createControlPanel(Composite parent) {
Composite comp;
GridLayout gridLayout = new GridLayout(2, false);
// create spinner for the rotation angle
comp = new Composite(parent, SWT.NONE);
comp.setLayout(gridLayout);
new Label(comp, SWT.CENTER).setText(GraphicsExample.getResourceString("Rotate")); //$NON-NLS-1$
rotateSpinner = new Spinner(comp, SWT.BORDER | SWT.WRAP);
GC gc = new GC(rotateSpinner);
int width = gc.getFontMetrics().getAverageCharWidth() * 5;
gc.dispose();
rotateSpinner.setLayoutData(new GridData(width, SWT.DEFAULT));
rotateSpinner.setSelection(0);
rotateSpinner.setMinimum(-720);
rotateSpinner.setMaximum(720);
rotateSpinner.setIncrement(30);
rotateSpinner.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
example.redraw();
}
});
// create a spinner for translating along the x axis
comp = new Composite(parent, SWT.NONE);
comp.setLayout(gridLayout);
new Label(comp, SWT.CENTER).setText(GraphicsExample.getResourceString("xtranslate")); //$NON-NLS-1$
translateSpinnerX = new Spinner(comp, SWT.BORDER | SWT.WRAP);
translateSpinnerX.setLayoutData(new GridData(width, SWT.DEFAULT));
translateSpinnerX.setMinimum(-100);
translateSpinnerX.setMaximum(500);
translateSpinnerX.setSelection(0);
translateSpinnerX.setIncrement(10);
translateSpinnerX.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
example.redraw();
}
});
// create a spinner for translating along the y axis
comp = new Composite(parent, SWT.NONE);
comp.setLayout(gridLayout);
new Label(comp, SWT.CENTER).setText(GraphicsExample.getResourceString("ytranslate")); //$NON-NLS-1$
translateSpinnerY = new Spinner(comp, SWT.BORDER | SWT.WRAP);
translateSpinnerY.setLayoutData(new GridData(width, SWT.DEFAULT));
translateSpinnerY.setMinimum(-100);
translateSpinnerY.setMaximum(500);
translateSpinnerY.setSelection(0);
translateSpinnerY.setIncrement(10);
translateSpinnerY.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
example.redraw();
}
});
// create a spinner for scaling along the x axis
comp = new Composite(parent, SWT.NONE);
comp.setLayout(gridLayout);
new Label(comp, SWT.CENTER).setText(GraphicsExample.getResourceString("xscale")); //$NON-NLS-1$
scaleSpinnerX = new Spinner(comp, SWT.BORDER | SWT.WRAP);
scaleSpinnerX.setLayoutData(new GridData(width, SWT.DEFAULT));
scaleSpinnerX.setDigits(2);
scaleSpinnerX.setMinimum(1);
scaleSpinnerX.setMaximum(400);
scaleSpinnerX.setSelection(100);
scaleSpinnerX.setIncrement(10);
scaleSpinnerX.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
example.redraw();
}
});
// create a spinner for scaling along the y axis
comp = new Composite(parent, SWT.NONE);
comp.setLayout(gridLayout);
new Label(comp, SWT.CENTER).setText(GraphicsExample.getResourceString("yscale")); //$NON-NLS-1$
scaleSpinnerY = new Spinner(comp, SWT.BORDER | SWT.WRAP);
scaleSpinnerY.setLayoutData(new GridData(width, SWT.DEFAULT));
scaleSpinnerY.setDigits(2);
scaleSpinnerY.setMinimum(1);
scaleSpinnerY.setMaximum(400);
scaleSpinnerY.setSelection(100);
scaleSpinnerY.setIncrement(10);
scaleSpinnerY.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
example.redraw();
}
});
// create a button for inverting the transform matrix
comp = new Composite(parent, SWT.NONE);
comp.setLayout(new GridLayout());
invertButton = new Button(comp, SWT.TOGGLE);
invertButton.setText(GraphicsExample.getResourceString("Invert")); //$NON-NLS-1$
invertButton.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
example.redraw();
}
});
}
/* (non-Javadoc)
* @see org.eclipse.swt.examples.graphics.GraphicsTab#paint(org.eclipse.swt.graphics.GC, int, int)
*/
@Override
public void paint(GC gc, int width, int height) {
if (!example.checkAdvancedGraphics()) return;
Device device = gc.getDevice();
Image image = GraphicsExample.loadImage(device, GraphicsExample.class, "ace_club.jpg");
Transform transform = new Transform(device);
// scale image
transform.scale(scaleSpinnerX.getSelection()/100f, scaleSpinnerY.getSelection()/100f);
// translate image
transform.translate(translateSpinnerX.getSelection(), translateSpinnerY.getSelection());
// rotate on center of image
Rectangle rect = image.getBounds();
transform.translate(rect.width/2, rect.height/2);
transform.rotate(rotateSpinner.getSelection());
transform.translate(-rect.width/2, -rect.height/2);
if(invertButton.getSelection()){
transform.invert();
}
gc.setTransform(transform);
gc.drawImage(image, 0, 0);
transform.dispose();
image.dispose();
}
}
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