/**
* Calculate the colours value of the point xy on the line point1 and point2.
*
* @param colorSpace colour space to apply to the function output
* @param xy point to calcualte the colour of.
* @param point1 start of gradient line
* @param point2 end of gradient line.
* @param t0 domain min
* @param t1 domain max
* @return colour derived from the input parameters.
*/
private Color calculateColour(
PColorSpace colorSpace,
Point2D.Float xy,
Point2D.Float point1,
Point2D.Float point2,
float t0,
float t1) {
// find colour at point 1
float xPrime = linearMapping(xy, point1, point2);
float t = parametrixValue(xPrime, t0, t1, extend);
// find colour at point 2
float[] input = new float[1];
input[0] = t;
// apply the function to the given input
if (function != null) {
float[] output;
int length = function.length;
// simple 1 in N out function
if (length == 1) {
output = function[0].calculate(input);
} else {
// vector of function for each colour component, 1 in 1 out.
output = new float[length];
for (int i = 0; i < length; i++) {
output[i] = function[i].calculate(input)[0];
}
}
if (output != null) {
output = PColorSpace.reverse(output);
return colorSpace.getColor(output, true);
} else {
return null;
}
} else {
logger.fine("Error processing Shading Type 2 Pattern.");
return null;
}
}
public Color getColor(float[] f, boolean fillAndStroke) {
init();
if (colorSpace != null && !failed) {
try {
// generate a key for the colour
int key = generateKey(f);
if (f.length <= 3) {
return addColorToCache(iccColorCache3B, key, colorSpace, f);
} else {
return addColorToCache(iccColorCache4B, key, colorSpace, f);
}
} catch (Exception e) {
logger.log(Level.FINE, "Error getting ICCBased colour", e);
failed = true;
}
}
return alternate.getColor(f);
}
@SuppressWarnings("unchecked")
public synchronized void init() {
if (inited) {
return;
}
// shading dictionary
if (shading == null) {
shading = library.getDictionary(entries, SHADING_KEY);
}
shadingType = library.getInt(shading, SHADING_TYPE_KEY);
bBox = library.getRectangle(shading, BBOX_KEY);
colorSpace = PColorSpace.getColorSpace(library, library.getObject(shading, COLORSPACE_KEY));
Object tmp = library.getObject(shading, BACKGROUND_KEY);
if (tmp != null && tmp instanceof List) {
background = (java.util.List) tmp;
}
antiAlias = library.getBoolean(shading, ANTIALIAS_KEY);
// get type 2 specific data.
tmp = library.getObject(shading, DOMAIN_KEY);
if (tmp instanceof List) {
domain = (List<Number>) tmp;
} else {
domain = new ArrayList<Number>(2);
domain.add(new Float(0.0));
domain.add(new Float(1.0));
}
tmp = library.getObject(shading, COORDS_KEY);
if (tmp instanceof List) {
coords = (java.util.List) tmp;
}
tmp = library.getObject(shading, EXTEND_KEY);
if (tmp instanceof List) {
extend = (List<Boolean>) tmp;
} else {
extend = new ArrayList<Boolean>(2);
extend.add(false);
extend.add(false);
}
tmp = library.getObject(shading, FUNCTION_KEY);
if (tmp != null) {
if (!(tmp instanceof List)) {
function = new Function[] {Function.getFunction(library, tmp)};
} else {
List functionTemp = (List) tmp;
function = new Function[functionTemp.size()];
for (int i = 0; i < functionTemp.size(); i++) {
function[i] = Function.getFunction(library, functionTemp.get(i));
}
}
}
// calculate the t's
float t0 = domain.get(0).floatValue();
float t1 = domain.get(1).floatValue();
// first off, create the two needed start and end points of the line
Point2D.Float startPoint =
new Point2D.Float(
((Number) coords.get(0)).floatValue(), ((Number) coords.get(1)).floatValue());
Point2D.Float endPoint =
new Point2D.Float(
((Number) coords.get(2)).floatValue(), ((Number) coords.get(3)).floatValue());
// corner case where a pdf engine give zero zero coords which batik
// can't handle so we pad it slightly.
if (startPoint.equals(endPoint)) {
endPoint.x++;
}
// calculate colour based on points that make up the line, 10 is a good
// number for speed and gradient quality.
int numberOfPoints = 10;
Color[] colors = calculateColorPoints(numberOfPoints, startPoint, endPoint, t0, t1);
float[] dist = calculateDomainEntries(numberOfPoints, t0, t1);
linearGradientPaint =
new LinearGradientPaint(
startPoint,
endPoint,
dist,
colors,
MultipleGradientPaint.NO_CYCLE,
MultipleGradientPaint.LINEAR_RGB,
matrix);
inited = true;
}
