/*
* Copyright 2006 MH-Software-Entwicklung. All rights reserved.
* Use is subject to license terms.
*/
package com.jtattoo.plaf.aluminium;
import java.util.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.geom.*;
/**
*
* @author Michael Hagen
*/
/**
* The <code>AluminiumGradientPaint</code> class provides a way to fill
* a {@link Shape} with a aluminium like pattern.
*
* @see Paint
* @see Graphics2D#setPaint
*/
public class AluminiumGradientPaint implements Paint {
private Dimension size = null;
private Point offset = null;
public AluminiumGradientPaint(Point offset, Dimension size) {
this.offset = offset;
this.size = size;
}
/**
* Creates and returns a context used to generate the color pattern.
* @param cm {@link ColorModel} that receives
* the <code>Paint</code> data. This is used only as a hint.
* @param deviceBounds the device space bounding box of the
* graphics primitive being rendered
* @param userBounds the user space bounding box of the
* graphics primitive being rendered
* @param xform the {@link AffineTransform} from user
* space into device space
* @param hints the hints that the context object uses to choose
* between rendering alternatives
* @return the {@link PaintContext} that generates color patterns.
* @see PaintContext
*/
public PaintContext createContext(ColorModel cm,
Rectangle deviceBounds,
Rectangle2D userBounds,
AffineTransform xform,
RenderingHints hints) {
return new GradientPaintContext(cm, deviceBounds, offset, size);
}
/**
* Returns the transparency mode for this <code>GradientPaint</code>.
* @return an integer value representing this <code>GradientPaint</code>
* object's transparency mode.
* @see Transparency
*/
public int getTransparency() {
return OPAQUE;
}
//---------------------------------------------------------------------------------------------------------------
private static final class GradientPaintContext implements PaintContext {
// the pattern is like a picture of horizontal smooth lightgray lines
private static final int PATTERN_WIDTH = 124;
private static final int PATTERN_HEIGHT = 31;
private static final int[] PATTERN = {
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26, 26, 26, 26, 26, 26, 26, 26, 27, 27, 27, 27, 27, 27, 27, 27, 25, 25, 25, 25, 25, 25, 25, 25, 26, 26, 26, 27, 27, 26, 26,
26, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 26, 26, 26, 26, 26, 26,
26, 26, 26, 26, 26, 26, 25, 25, 25, 25, 26, 26, 26, 26, 26, 26, 26, 26, 28, 28, 28, 28, 28, 28, 28, 28, 27, 27, 27, 27, 28,
28, 28, 28, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 27, 27, 27, 27, 27, 27, 27, 27, 27, 28, 28, 29, 29, 29, 29,
28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 29, 29, 28, 28,
28, 27, 27, 27, 27, 27, 27, 27, 27, 27, 28, 28, 28, 28, 28, 28, 28, 28, 27, 27, 27, 27, 27, 27, 27, 27, 26, 26, 26, 26, 26,
26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 27, 27, 27, 27, 27, 27, 27, 27, 25, 25, 26, 26, 26, 26, 26, 26, 25, 25, 25, 25,};
private ColorModel colorModel = null;
private Rectangle rect = null;
private Point offset = null;
private Dimension size = null;
private int[] gradientSample = null;
private Hashtable rasterCache = new Hashtable();
public GradientPaintContext(ColorModel cm, Rectangle r, Point o, Dimension s) {
colorModel = cm;
rect = r;
offset = o;
size = s;
createSample();
}
public void dispose() {
// rasterCache.clear();
}
public ColorModel getColorModel() {
return colorModel;
}
public Raster getRaster(int x, int y, int w, int h) {
// if gradientSample is not created (maybe size is invalid) return a solid lightgray raster.
// normally this should not happen
if (gradientSample == null) {
// create a compatible raster
WritableRaster raster = colorModel.createCompatibleWritableRaster(w, h);
int color = (220 << 16) | (220 << 8) | (220);
// simply fill the raster with a color value of RGB(220,220,220)
for (int j = 0; j < h; j++) {
for (int i = 0; i < w; i++) {
raster.setDataElements(i, j, colorModel.getDataElements(color, null));
}
}
return raster;
} else {
// if the x position is earlier requested we can return the chached raster
Object o = rasterCache.get(new Integer(x));
if (o != null) {
return (Raster) o;
} else {
// create a compatible raster
WritableRaster raster = colorModel.createCompatibleWritableRaster(w, h);
// calculate the offset into the gradientSample
int offs = x - (int) rect.x + offset.x;
// set the pixels of the raster as a combination of PATTERN pixels and gradientSample pixels
for (int j = 0; j < h; j++) {
for (int i = 0; i < w; i++) {
// calculate the coords of the PATTERN pixel
int xi = Math.abs(offset.x + x + i) % PATTERN_WIDTH;
int yi = Math.abs(offset.y + y + j) % PATTERN_HEIGHT;
int c1 = gradientSample[Math.abs(offs + i) % gradientSample.length];
// calculate the coord of the gradientSample pixel
int c2 = PATTERN[(yi * PATTERN_WIDTH) + xi];
// combine the pixels
int c = c1 - c2;
// calculate the color value
int color = ((c & 0xFF) << 16) | ((c & 0xFF) << 8) | (c & 0xFF);
// put it into the raster
raster.setDataElements(i, j, colorModel.getDataElements(color, null));
}
}
// remember this raster
rasterCache.put(new Integer(x), raster);
return raster;
}
}
}
private void createSample() {
// do not create a gradientSample if size does not match
if ((size.width > 8) && (size.width < 4096)) {
// we only need to calculate the first part of gradientSample the second one is the inverse copy
int w = (size.width + 1) / 2;
gradientSample = new int[w * 2];
// create the gradientSample from light gray RGB(224,224,224) to white RGB(255,255,255)
float c1 = 224.0f;
float c2 = 255.0f;
float dc = (c2 - c1) / w;
float c = c1;
gradientSample[0] = (int) c1;
for (int i = 1; i < w - 1; i++) {
c += dc;
gradientSample[i] = (int) c;
}
gradientSample[w - 1] = (int) c2;
// copy the first part
for (int i = w, j = w - 1; i < size.width; i++, j--) {
gradientSample[i] = gradientSample[j];
}
}
}
} // class GradientPaintContext
} // class AluminiumGradientPaint