ImageRenderer.java

/**
 * Copyright (c) 2006-2009 committers of mda4e 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:
 *     committers of mda4e (http://www.mda4e.org/) - initial API and implementation
 *
 */
package org.yakindu.sct.ui.editor.editor.figures.utils;

import java.util.Arrays;

import org.eclipse.draw2d.geometry.Dimension;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.PaletteData;
import org.eclipse.swt.graphics.RGB;

/**
 * 
 * @deprecated Use {@link GraphicsUtil} instead
 * 
 */
public class ImageRenderer {

	public ImageData calculateVerticalAlphaGradient(Rectangle bounds,
			RGB color, int alphaMax) {

		// we build an indexed palette with one color
		RGB[] colors = new RGB[2];
		colors[0] = new RGB(0, 0, 0);
		colors[1] = (color != null) ? color : new RGB(255, 255, 255);
		PaletteData pd = new PaletteData(colors);

		// we use image with 1 bit color depth plus alpha
		int bytesPerRow = bounds.width / 8 + ((bounds.width % 8 != 0) ? 1 : 0);
		byte[] data = new byte[bytesPerRow * bounds.height];

		// fill all pixel with the same color
		Arrays.fill(data, (byte) 0xFF);

		// and create the image
		ImageData id = new ImageData(bounds.width, bounds.height, 1, pd, 1,
				data);

		// now calculate the gradient of alpha values ...
		byte[] alphaData = id.alphaData = new byte[bounds.width * bounds.height];
		double alphaFactor = alphaMax;
		double height = bounds.height;
		for (int i = 0; i < bounds.height; i++) {
			// double ratio = (i<=alphaMaxPos) ? (2.0*i/height) : (2.0*
			// (height-i)/height);
			double ratio = 1.0 - Math.sin(i / height * Math.PI / 2.0);
			byte alphaValue = (byte) (ratio * alphaFactor);
			Arrays.fill(alphaData, i * bounds.width, i * bounds.width
					+ bounds.width, alphaValue);
		}

		return id;
	}

	/**
	 * Masks the corners of a rounded rectangle with a specified alpha value.
	 * 
	 * @param imageData
	 * @param bounds
	 * @param corner
	 * @param alphaValue
	 * @return The manipulated image data that is the same instance that is
	 *         specified by the parameter {@link #imageData}.
	 */
	public ImageData maskAlphaAsRoundedrectangle(ImageData imageData,
			Dimension corner, int alphaValue) {

		byte[] alphaData = imageData.alphaData;
		int width = imageData.width;
		int height = imageData.height;
		int r = corner.width / 2;
		double r_square = r * r;
		byte[] alphaPixel = new byte[r];
		Arrays.fill(alphaPixel, (byte) alphaValue);

		// make sure that the corner radius is smaller than the image dimensions
		// and make it smaller if necessary
		r = Math.min(r, Math.min(imageData.height, imageData.width) / 2);

		for (int i = 0; i < r; i++) {
			// calculate pixel
			int p = r - (int) Math.sqrt(r_square - (double) ((i) * (i)));
			// mask corners ...
			if (p > 0) {
				System.arraycopy(alphaPixel, 0, alphaData, (r - (i + 1))
						* width, p);
				System.arraycopy(alphaPixel, 0, alphaData, (r - (i + 1))
						* width + (width - p), p);
				System.arraycopy(alphaPixel, 0, alphaData,
						((height - (r - (i)))) * width, p);
				System.arraycopy(alphaPixel, 0, alphaData,
						((height - (r - (i)))) * width + (width - p), p);
			}
		}

		return imageData;
	}

	/**
	 * 
	 * @param graphics
	 * @return
	 */
	protected ImageData calculateVerticalRoundedRectangleLinearColorGradient(
			Rectangle bounds, Dimension corner, RGB c1, RGB c2) {

		PaletteData pd = new PaletteData(0xFF0000, 0xFF00, 0xFF);
		byte[] data = new byte[3 * bounds.width * bounds.height];

		for (int i = 0; i < bounds.width; i++) {
			double ratio = (double) i / (double) bounds.width;
			int red = (int) (c1.red * (1 - ratio) + c2.red * ratio);
			int green = (int) (c1.green * (1 - ratio) + c2.green * ratio);
			int blue = (int) (c1.blue * (1 - ratio) + c2.blue * ratio);
			data[i * 3 + 0] = (byte) red;
			data[i * 3 + 1] = (byte) green;
			data[i * 3 + 2] = (byte) blue;
		}

		for (int i = 1; i < bounds.height; i++) {
			System.arraycopy(data, 0, data, i * 3 * bounds.width,
					3 * bounds.width);
		}

		int r = corner.width / 2;
		double r_square = r * r;
		byte[] alphaPixel = new byte[r * 3];
		Arrays.fill(alphaPixel, (byte) 0);

		for (int i = 0; i < r; i++) {
			// calculate pixel
			int p = r - (int) Math.sqrt(r_square - (double) ((i) * (i)));
			// mask corners ...
			if (p > 0) {
				System.arraycopy(alphaPixel, 0, data, (r - (i + 1)) * 3
						* bounds.width, p * 3);
				System.arraycopy(alphaPixel, 0, data, (r - (i + 1)) * 3
						* bounds.width + (bounds.width - p) * 3, p * 3);
				System.arraycopy(alphaPixel, 0, data,
						((bounds.height - (r - (i)))) * 3 * bounds.width, p * 3);
				System.arraycopy(alphaPixel, 0, data,
						((bounds.height - (r - (i)))) * 3 * bounds.width
								+ (bounds.width - p) * 3, p * 3);
			}
		}

		ImageData id = new ImageData(bounds.width, bounds.height, 24, pd, 3,
				data);
		id.transparentPixel = 0;

		return id;
	}

}