| /******************************************************************************* |
| * 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 shows the effects of applying various interpolation algorithms to |
| * images that have been stretched or shrunk. |
| */ |
| public class InterpolationTab extends GraphicsTab { |
| |
| Combo imageCb; // combo for selecting images |
| |
| public InterpolationTab(GraphicsExample example) { |
| super(example); |
| } |
| |
| public String getCategory() { |
| return GraphicsExample.getResourceString("Image"); //$NON-NLS-1$ |
| } |
| |
| public String getText() { |
| return GraphicsExample.getResourceString("Interpolation"); //$NON-NLS-1$ |
| } |
| |
| public String getDescription() { |
| return GraphicsExample.getResourceString("ImageInterpolationDesc"); //$NON-NLS-1$ |
| } |
| |
| public void createControlPanel(Composite parent) { |
| |
| Composite comp; |
| GridLayout gridLayout = new GridLayout(2, false); |
| |
| // create drop down combo |
| comp = new Composite(parent, SWT.NONE); |
| comp.setLayout(gridLayout); |
| new Label(comp, SWT.CENTER).setText(GraphicsExample |
| .getResourceString("Image")); //$NON-NLS-1$ |
| imageCb = new Combo(comp, SWT.DROP_DOWN); |
| imageCb.add(GraphicsExample.getResourceString("House")); //$NON-NLS-1$ |
| imageCb.add(GraphicsExample.getResourceString("Question")); //$NON-NLS-1$ |
| imageCb.add(GraphicsExample.getResourceString("Task")); //$NON-NLS-1$ |
| imageCb.add(GraphicsExample.getResourceString("Font")); //$NON-NLS-1$ |
| imageCb.add(GraphicsExample.getResourceString("Cube")); //$NON-NLS-1$ |
| imageCb.add(GraphicsExample.getResourceString("SWT")); //$NON-NLS-1$ |
| imageCb.add(GraphicsExample.getResourceString("Ovals")); //$NON-NLS-1$ |
| imageCb.select(0); |
| imageCb.addListener(SWT.Selection, new Listener() { |
| public void handleEvent(Event event) { |
| example.redraw(); |
| } |
| }); |
| } |
| |
| public void paint(GC gc, int width, int height) { |
| if (!example.checkAdvancedGraphics()) return; |
| Device device = gc.getDevice(); |
| |
| float scaleX = 10f; |
| float scaleY = 10f; |
| Image image = null; |
| switch (imageCb.getSelectionIndex()) { |
| |
| case 0: |
| image = GraphicsExample.loadImage(device, GraphicsExample.class, "home_nav.gif"); |
| break; |
| case 1: |
| image = GraphicsExample.loadImage(device, GraphicsExample.class, "help.gif"); |
| break; |
| case 2: |
| image = GraphicsExample.loadImage(device, GraphicsExample.class, "task.gif"); |
| break; |
| case 3: |
| image = GraphicsExample.loadImage(device, GraphicsExample.class, "font.gif"); |
| break; |
| case 4: |
| image = GraphicsExample.loadImage(device, GraphicsExample.class, "cube.png"); |
| scaleX = 0.75f; |
| scaleY = 0.5f; |
| break; |
| case 5: |
| image = GraphicsExample.loadImage(device, GraphicsExample.class, "swt.png"); |
| scaleX = 0.4f; |
| scaleY = 0.8f; |
| break; |
| case 6: |
| image = GraphicsExample.loadImage(device, GraphicsExample.class, "ovals.png"); |
| scaleX = 1.1f; |
| scaleY = 0.5f; |
| break; |
| } |
| |
| Rectangle bounds = image.getBounds(); |
| |
| // draw the original image |
| gc.drawImage(image, (width-bounds.width)/2, 20); |
| |
| Font font = new Font(device, getPlatformFont(), 20, SWT.NORMAL); |
| gc.setFont(font); |
| |
| // write some text below the original image |
| String text = GraphicsExample.getResourceString("OriginalImg"); //$NON-NLS-1$ |
| Point size = gc.stringExtent(text); |
| gc.drawString(text, (width-size.x)/2, 25 + bounds.height, true); |
| |
| Transform transform = new Transform(device); |
| transform.translate((width - (bounds.width * scaleX + 10) * 4) / 2, 25 + bounds.height + size.y + |
| (height - (25 + bounds.height + size.y + bounds.height*scaleY)) / 2); |
| transform.scale(scaleX, scaleY); |
| |
| // --- draw strings --- |
| float[] point = new float[2]; |
| text = GraphicsExample.getResourceString("None"); //$NON-NLS-1$ |
| size = gc.stringExtent(text); |
| point[0] = (scaleX*bounds.width + 5 - size.x)/(2*scaleX); |
| point[1] = bounds.height; |
| transform.transform(point); |
| gc.drawString(text, (int)point[0], (int)point[1], true); |
| |
| text = GraphicsExample.getResourceString("Low"); //$NON-NLS-1$ |
| size = gc.stringExtent(text); |
| point[0] = (scaleX*bounds.width + 5 - size.x)/(2*scaleX) + bounds.width; |
| point[1] = bounds.height; |
| transform.transform(point); |
| gc.drawString(text, (int)point[0], (int)point[1], true); |
| |
| text = GraphicsExample.getResourceString("Default"); //$NON-NLS-1$ |
| size = gc.stringExtent(text); |
| point[0] = (scaleX*bounds.width + 5 - size.x)/(2*scaleX) + 2*bounds.width; |
| point[1] = bounds.height; |
| transform.transform(point); |
| gc.drawString(text, (int)point[0], (int)point[1], true); |
| |
| text = GraphicsExample.getResourceString("High"); //$NON-NLS-1$ |
| size = gc.stringExtent(text); |
| point[0] = (scaleX*bounds.width + 5 - size.x)/(2*scaleX) + 3*bounds.width; |
| point[1] = bounds.height; |
| transform.transform(point); |
| gc.drawString(text, (int)point[0], (int)point[1], true); |
| |
| gc.setTransform(transform); |
| transform.dispose(); |
| |
| // --- draw images --- |
| |
| // no interpolation |
| gc.setInterpolation(SWT.NONE); |
| gc.drawImage(image, 0, 0); |
| |
| // low interpolation |
| gc.setInterpolation(SWT.LOW); |
| gc.drawImage(image, bounds.width, 0); |
| |
| // default interpolation |
| gc.setInterpolation(SWT.DEFAULT); |
| gc.drawImage(image, 2*bounds.width, 0); |
| |
| // high interpolation |
| gc.setInterpolation(SWT.HIGH); |
| gc.drawImage(image, 3*bounds.width, 0); |
| |
| font.dispose(); |
| if (image != null) image.dispose(); |
| } |
| |
| /** |
| * Returns the name of a valid font for the host platform. |
| */ |
| static String getPlatformFont() { |
| if(SWT.getPlatform() == "win32") { |
| return "Arial"; |
| } else if (SWT.getPlatform() == "motif") { |
| return "Helvetica"; |
| } else if (SWT.getPlatform() == "gtk") { |
| return "Baekmuk Batang"; |
| } else if (SWT.getPlatform() == "carbon") { |
| return "Arial"; |
| } else { // photon, etc ... |
| return "Verdana"; |
| } |
| } |
| } |