Java tutorial
/******************************************************************************* * 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.Image; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.graphics.Transform; import org.eclipse.swt.layout.GridData; 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.Spinner; /** * 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 = (int) (gc.getFontMetrics().getAverageCharacterWidth() * 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, 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, 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, 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, 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, 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, event -> example.redraw()); } @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(); } }