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An Open Source JavaFX PDF Viewer
/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/support/
*
* (C) Copyright 1997-2015 IDRsolutions and Contributors.
*
* This file is part of JPedal/JPDF2HTML5
*
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ---------------
* RadialContext.java
* ---------------
*/
package com.idrsolutions.pdf.color.shading;
import java.awt.Color;
import java.awt.PaintContext;
import java.awt.geom.AffineTransform;
import java.awt.geom.GeneralPath;
import java.awt.geom.PathIterator;
import java.awt.geom.Point2D;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import org.jpedal.color.GenericColorSpace;
import org.jpedal.function.PDFFunction;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.objects.raw.PdfObject;
public class RadialContext implements PaintContext {
private final GenericColorSpace shadingColorSpace;
private final float[] background;
private final PdfObject shadingObj;
private final PDFFunction[] function;
private final float[] coords;
private boolean[] extended = {false, false};
private float t0;
private float t1 = 1.0f;
private final float x0, y0, r0, x1, y1, r1, deltaX, deltaY, deltaR, deltaC, powerR0;
private final Color colorT0, colorT1;
RadialContext(AffineTransform xForm, boolean isPrinting, GenericColorSpace shadingColorSpace, float[] background, PdfObject shading, float[][] matrix,PDFFunction[] function) {
this.shadingColorSpace = shadingColorSpace;
this.background = background;
this.shadingObj = shading;
this.function = function;
float[] src = shading.getFloatArray(PdfDictionary.Coords);
final boolean[] extension = shadingObj.getBooleanArray(PdfDictionary.Extend);
if (extension != null) {
extended = extension;
}
final float[] domain = shadingObj.getFloatArray(PdfDictionary.Domain);
if (domain != null) {
t0 = domain[0];
t1 = domain[1];
}
coords = new float[src.length];
System.arraycopy(src, 0, coords, 0, src.length);
//apply matrix and file values;
AffineTransform affine = new AffineTransform(matrix[0][0], matrix[0][1], matrix[1][0], matrix[1][1], matrix[2][0], matrix[2][1]);
PathIterator iter;
GeneralPath gp;//path for coords
double[] temp = new double[6];
Point2D pointXY0, pointXY1, temp0, temp1;
gp = new GeneralPath();
gp.moveTo(coords[0], coords[1]);
gp.lineTo(coords[0] + coords[2], coords[1]);
iter = gp.getPathIterator(affine);
iter.currentSegment(temp);
pointXY0 = new Point2D.Double(temp[0], temp[1]);
iter.next();
iter.currentSegment(temp);
temp0 = new Point2D.Double(temp[0],temp[1]);
gp = new GeneralPath();
gp.moveTo(coords[3], coords[4]);
gp.lineTo(coords[3] + coords[5], coords[4]);
iter = gp.getPathIterator(affine);
iter.currentSegment(temp);
pointXY1 = new Point2D.Double(temp[0], temp[1]);
iter.next();
iter.currentSegment(temp);
temp1 = new Point2D.Double(temp[0],temp[1]);
Point2D[] points = new Point2D[4];
points[0] = pointXY0;
points[1] = pointXY1;
points[2] = temp0;
points[3] = temp1;
xForm.transform(points, 0,points, 0, 4);
x0 = (float) points[0].getX();
y0 = (float) points[0].getY();
x1 = (float) points[1].getX();
y1 = (float) points[1].getY();
r0 = (float) points[0].distance(points[2]);
r1 = (float) points[1].distance(points[3]);
colorT0 = calculateColor(t0);
colorT1 = calculateColor(t1);
//dont use Math.pow functions here;
deltaX = x1 - x0;
deltaY = y1 - y0;
deltaR = r1 - r0;
deltaC = deltaX * deltaX + deltaY * deltaY - deltaR * deltaR;
powerR0 = r0 * r0;
// System.out.println("page height "+pageHeight+" offx"+offX+" offY"+offY+" pagew"+cropX);
}
@Override
public void dispose() {
}
@Override
public ColorModel getColorModel() {
return ColorModel.getRGBdefault();
}
private Color calculateColor(final float val) {
final float[] colValues = ShadingFactory.applyFunctions(function, new float[]{val});
shadingColorSpace.setColor(colValues, colValues.length);
return (Color) shadingColorSpace.getColor();
}
@Override
public Raster getRaster(int startX, int startY, int w, int h) {
final int[] data = new int[w * h * 4];
if (background != null) {
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
shadingColorSpace.setColor(background, shadingColorSpace.getColorComponentCount());
final Color c = (Color) shadingColorSpace.getColor();
//set color for the pixel with values
final int base = (y * w + x) * 4;
data[base] = c.getRed();
data[base + 1] = c.getGreen();
data[base + 2] = c.getBlue();
data[base + 3] = 255;
}
}
}
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
// float[] xy = PixelFactory.convertPhysicalToPDF(isPrinting, x, y, offX, offY, (1f / scaling), startX, startY, cropX, pageHeight);
float[] xy = {x+startX,y+startY};//ShadingUtils.getPixelPDF(isPrinting, rotation, x, y, startX, startY, offX, offY, cropX, pageHeight, scaling);
Color result = null;
float[] qr = quadraticEquate(xy[0], xy[1]);
if (qr[1] >= 0 && qr[1] <= 1) {
result = calculateColor(getTfromS(qr[1]));
} else if (extended[1] && qr[1] >= 0 && r1 + qr[1] * deltaR >= 0) {
result = colorT1;
} else if (qr[0] >= 0 && qr[0] <= 1) {
result = calculateColor(getTfromS(qr[0]));
} else if (extended[0] && qr[1] <= 0 && r1 + qr[1] * deltaR >= 0) {
result = calculateColor(getTfromS(qr[1]));
} else if (extended[0] && qr[0] <= 1 && r1 + qr[0] * deltaR >= 0) {
result = colorT0;
}
if (result != null) {
final int base = (y * w + x) * 4;
data[base] = result.getRed();
data[base + 1] = result.getGreen();
data[base + 2] = result.getBlue();
data[base + 3] = 255;
}
}
}
final WritableRaster raster = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB).getRaster();
raster.setPixels(0, 0, w, h, data);
return raster;
}
private float getTfromS(float s) {
return (s * (t1 - t0)) + t0;
}
private float[] quadraticEquate(float x, float y) {
float xDiff = x - x0;
float yDiff = y - y0;
float p = -xDiff * deltaX - yDiff * deltaY - r0 * deltaR;
float q = xDiff * xDiff + yDiff * yDiff - powerR0; //dont use Math.pow to xdiff,ydiff;
float sqrt = (float) Math.sqrt(p * p - deltaC * q);
float sA = (sqrt - p) / deltaC;
float sB = (-p - sqrt) / deltaC;
return ((deltaC < 0) ? new float[]{sA, sB} : new float[]{sB, sA});
}
}