/**
* Constructor creates an instance to be used for fill operations.
*
* @param shading the shading type to be used
* @param colorModel the color model to be used
* @param xform transformation for user to device space
* @param matrix the pattern matrix concatenated with that of the parent content stream
* @param deviceBounds the bounds of the area to paint, in device units
* @throws IOException if there is an error getting the color space or doing color conversion.
*/
public AxialShadingContext(
PDShadingType2 shading,
ColorModel colorModel,
AffineTransform xform,
Matrix matrix,
Rectangle deviceBounds)
throws IOException {
super(shading, colorModel, xform, matrix);
this.axialShadingType = shading;
coords = shading.getCoords().toFloatArray();
// domain values
if (shading.getDomain() != null) {
domain = shading.getDomain().toFloatArray();
} else {
// set default values
domain = new float[] {0, 1};
}
// extend values
COSArray extendValues = shading.getExtend();
if (shading.getExtend() != null) {
extend = new boolean[2];
extend[0] = ((COSBoolean) extendValues.get(0)).getValue();
extend[1] = ((COSBoolean) extendValues.get(1)).getValue();
} else {
// set default values
extend = new boolean[] {false, false};
}
// calculate some constants to be used in getRaster
x1x0 = coords[2] - coords[0];
y1y0 = coords[3] - coords[1];
d1d0 = domain[1] - domain[0];
denom = Math.pow(x1x0, 2) + Math.pow(y1y0, 2);
try {
// get inverse transform to be independent of current user / device space
// when handling actual pixels in getRaster()
rat = matrix.createAffineTransform().createInverse();
rat.concatenate(xform.createInverse());
} catch (NoninvertibleTransformException ex) {
LOG.error(ex, ex);
}
// shading space -> device space
AffineTransform shadingToDevice = (AffineTransform) xform.clone();
shadingToDevice.concatenate(matrix.createAffineTransform());
// worst case for the number of steps is opposite diagonal corners, so use that
double dist =
Math.sqrt(
Math.pow(deviceBounds.getMaxX() - deviceBounds.getMinX(), 2)
+ Math.pow(deviceBounds.getMaxY() - deviceBounds.getMinY(), 2));
factor = (int) Math.ceil(dist);
// build the color table for the given number of steps
colorTable = calcColorTable();
}
/**
* Constructor creates an instance to be used for fill operations.
*
* @param shading the shading type to be used
* @param colorModel the color model to be used
* @param xform transformation for user to device space
* @param ctm the transformation matrix
* @param dBounds device bounds
* @param pageHeight height of the current page
*/
public RadialShadingContext(
PDShadingType3 shading,
ColorModel colorModel,
AffineTransform xform,
Matrix ctm,
int pageHeight,
Rectangle dBounds)
throws IOException {
super(shading, colorModel, xform, ctm, pageHeight, dBounds);
this.radialShadingType = shading;
coords = shading.getCoords().toFloatArray();
if (ctm != null) {
// the shading is used in combination with the sh-operator
// transform the coords from shading to user space
ctm.createAffineTransform().transform(coords, 0, coords, 0, 1);
ctm.createAffineTransform().transform(coords, 3, coords, 3, 1);
// scale radius to user space
coords[2] *= ctm.getXScale();
coords[5] *= ctm.getXScale();
// move the 0,0-reference
coords[1] = pageHeight - coords[1];
coords[4] = pageHeight - coords[4];
} else {
// the shading is used as pattern colorspace in combination
// with a fill-, stroke- or showText-operator
float translateY = (float) xform.getTranslateY();
// move the 0,0-reference including the y-translation from user to device space
coords[1] = pageHeight + translateY - coords[1];
coords[4] = pageHeight + translateY - coords[4];
}
// transform the coords from user to device space
xform.transform(coords, 0, coords, 0, 1);
xform.transform(coords, 3, coords, 3, 1);
// scale radius to device space
coords[2] *= xform.getScaleX();
coords[5] *= xform.getScaleX();
// a radius is always positive
coords[2] = Math.abs(coords[2]);
coords[5] = Math.abs(coords[5]);
// domain values
if (this.radialShadingType.getDomain() != null) {
domain = shading.getDomain().toFloatArray();
} else {
// set default values
domain = new float[] {0, 1};
}
// extend values
COSArray extendValues = shading.getExtend();
if (shading.getExtend() != null) {
extend = new boolean[2];
extend[0] = ((COSBoolean) extendValues.get(0)).getValue();
extend[1] = ((COSBoolean) extendValues.get(1)).getValue();
} else {
// set default values
extend = new boolean[] {false, false};
}
// calculate some constants to be used in getRaster
x1x0 = coords[3] - coords[0];
y1y0 = coords[4] - coords[1];
r1r0 = coords[5] - coords[2];
x1x0pow2 = Math.pow(x1x0, 2);
y1y0pow2 = Math.pow(y1y0, 2);
r0pow2 = Math.pow(coords[2], 2);
denom = x1x0pow2 + y1y0pow2 - Math.pow(r1r0, 2);
d1d0 = domain[1] - domain[0];
// get background values if available
COSArray bg = shading.getBackground();
if (bg != null) {
background = bg.toFloatArray();
rgbBackground = convertToRGB(background);
}
longestDistance = getLongestDis();
colorTable = calcColorTable();
}
/**
* This will get a stream (or the reference to a stream) from the array.
*
* @param index The index of the requested stream
* @return The stream object or a reference to a stream
*/
public COSBase get(int index) {
return streams.get(index);
}
