/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 * All rights reserved. This Example Content is intended to demonstrate
 * usage of Eclipse technology. It is provided to you under the terms and
 * conditions of the Eclipse Distribution License v1.0 which is available
 * at http://www.eclipse.org/org/documents/edl-v10.php
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.snippets;

import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

/**
 * Draw images scaled to 0.5, 1, 1.25, 1.5, and 2 times original size.
 */
public class SnippetScaling {
	public static void main (String [] args) {
		Display display = new Display ();
		Shell shell = new Shell (display, SWT.SHELL_TRIM | SWT.DOUBLE_BUFFERED);
		shell.setLayout(new RowLayout(SWT.HORIZONTAL));
		
		createImages(createColumn(shell), new Image(display, "bin/org/eclipse/swt/snippets/eclipse16.png"));
		createImages(createColumn(shell), new Image(display, "bin/org/eclipse/swt/snippets/warning.gif"));
		createImages(createColumn(shell), display.getSystemImage (SWT.ICON_INFORMATION));
		createImages(createColumn(shell), display.getSystemImage (SWT.ICON_WARNING));
		createImages(createColumn(shell), display.getSystemImage (SWT.ICON_ERROR));
		createImages(createColumn(shell), display.getSystemImage (SWT.ICON_QUESTION));
		
		final Image triangleCircle = new Image(display, 16, 16);
		GC gc = new GC(triangleCircle);
		gc.drawPolyline(new int[] { 0,0, 15,0, 0,15, 0,0 });
		gc.drawOval(2, 2, 11, 11);
		gc.dispose();
		createImages(createColumn(shell), triangleCircle);
		
		shell.pack ();
		shell.open ();
		while (!shell.isDisposed ()) {
			if (!display.readAndDispatch ())
				display.sleep ();
		}
		display.dispose ();
	}

	private static Composite createColumn(Composite parent) {
		Composite column = new Composite(parent, SWT.NONE);
		column.setLayout(new FillLayout(SWT.VERTICAL));
		return column;
	}

	private static void createImages(Composite parent, final Image image) {
		Display display = parent.getDisplay();
		
		// ImageData#scaledTo(..)
		Composite datas = new Composite(parent, SWT.NONE);
		RowLayout rowLayout = new RowLayout();
		rowLayout.marginTop = rowLayout.marginLeft = 10;
		rowLayout.spacing = 0;
		datas.setLayout(rowLayout);
		Rectangle bounds = image.getBounds();
		new Label(datas, SWT.NONE).setImage(new Image(display, image.getImageData().scaledTo(
				(int) Math.round(bounds.width * 0.5) , (int) Math.round(bounds.height * 0.5))));
		new Label(datas, SWT.NONE).setImage(image);
		new Label(datas, SWT.NONE).setImage(new Image(display, image.getImageData().scaledTo(
				(int) Math.round(bounds.width * 1.25) , (int) Math.round(bounds.height * 1.25))));
		new Label(datas, SWT.NONE).setImage(new Image(display, image.getImageData().scaledTo(
				(int) Math.round(bounds.width * 1.5) , (int) Math.round(bounds.height * 1.5))));
		new Label(datas, SWT.NONE).setImage(new Image(display, image.getImageData().scaledTo(
				bounds.width * 2 , bounds.height * 2)));
		
		// Canvas SWT.Paint
		Canvas paint = new Canvas(parent, SWT.NONE);
		paint.addListener (SWT.Paint, new Listener () {
			@Override
			public void handleEvent (Event e) {
				Rectangle rect = image.getBounds ();
				int width = rect.width;
				int height = rect.height;
				GC gc = e.gc;
				int x = 10, y = 10;
				int w = 0;
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = (int)Math.round(width * 0.5), (int)Math.round(height * 0.5));
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = width, height);
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = (int)Math.round(width * 1.25), (int)Math.round(height * 1.25));
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = (int)Math.round(width * 1.5), (int)Math.round(height * 1.5));
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = width * 2, height * 2);
			}
		});
		
		// Canvas SWT.Paint with Antialias
		Canvas paintAnti = new Canvas(parent, SWT.NONE);
		paintAnti.addListener (SWT.Paint, new Listener () {
			@Override
			public void handleEvent (Event e) {
				Rectangle rect = image.getBounds ();
				int width = rect.width;
				int height = rect.height;
				GC gc = e.gc;
				gc.setAntialias(SWT.ON);
				int x = 10, y = 10;
				int w = 0;
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = (int)Math.round(width * 0.5), (int)Math.round(height * 0.5));
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = width, height);
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = (int)Math.round(width * 1.25), (int)Math.round(height * 1.25));
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = (int)Math.round(width * 1.5), (int)Math.round(height * 1.5));
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = width * 2, height * 2);
			}
		});
		
		Canvas paintLow = new Canvas(parent, SWT.NONE);
		paintLow.addListener (SWT.Paint, new Listener () {
			@Override
			public void handleEvent (Event e) {
				Rectangle rect = image.getBounds ();
				int width = rect.width;
				int height = rect.height;
				GC gc = e.gc;
				gc.setAntialias(SWT.ON);
				gc.setInterpolation(SWT.LOW);
				int x = 10, y = 10;
				int w = 0;
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = (int)Math.round(width * 0.5), (int)Math.round(height * 0.5));
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = width, height);
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = (int)Math.round(width * 1.25), (int)Math.round(height * 1.25));
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = (int)Math.round(width * 1.5), (int)Math.round(height * 1.5));
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = width * 2, height * 2);
			}
		});
		
		Canvas paintHigh = new Canvas(parent, SWT.NONE);
		paintHigh.addListener (SWT.Paint, new Listener () {
			@Override
			public void handleEvent (Event e) {
				Rectangle rect = image.getBounds ();
				int width = rect.width;
				int height = rect.height;
				GC gc = e.gc;
				gc.setAntialias(SWT.ON);
				gc.setInterpolation(SWT.HIGH);
				int x = 10, y = 10;
				int w = 0;
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = (int)Math.round(width * 0.5), (int)Math.round(height * 0.5));
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = width, height);
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = (int)Math.round(width * 1.25), (int)Math.round(height * 1.25));
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = (int)Math.round(width * 1.5), (int)Math.round(height * 1.5));
				gc.drawImage (image, 0, 0, width, height, x += w, y, w = width * 2, height * 2);
			}
		});
		
		Canvas paintTransform = new Canvas(parent, SWT.NONE);
		paintTransform.addListener (SWT.Paint, new Listener () {
			@Override
			public void handleEvent (Event e) {
				Rectangle rect = image.getBounds ();
				int width = rect.width;
				int height = rect.height;
				GC gc = e.gc;
//				gc.setAntialias(SWT.ON);
//				gc.setInterpolation(SWT.HIGH);
				int x = 10, y = 10;
				Transform transform = new Transform(display);
				transform.scale(0.5f, 0.5f);
				gc.setTransform(transform);
				gc.drawImage (image, 0, 0, width, height, Math.round(x / 0.5f), Math.round(y / 0.5f), width, height);
				x += Math.round(width * 0.5f);
				transform.dispose();
				
				gc.setTransform(null);
				gc.drawImage (image, 0, 0, width, height, x, y, width, height);
				x += width;
				
				transform = new Transform(display);
				transform.scale(1.25f, 1.25f);
				gc.setTransform(transform);
				gc.drawImage (image, 0, 0, width, height, Math.round(x / 1.25f), Math.round(y / 1.25f), width, height);
				x += Math.round(width * 1.25f);
				transform.dispose();
				
				transform = new Transform(display);
				transform.scale(1.5f, 1.5f);
				gc.setTransform(transform);
				gc.drawImage (image, 0, 0, width, height, Math.round(x / 1.5f), Math.round(y / 1.5f), width, height);
				x += Math.round(width * 1.5f);
				transform.dispose();
				
				transform = new Transform(display);
				transform.scale(2f, 2f);
				gc.setTransform(transform);
				gc.drawImage (image, 0, 0, width, height, Math.round(x / 2f), Math.round(y / 2f), width, height);
				x += Math.round(width * 2f);
				transform.dispose();
			}
		});
	}
}