com.itextpdf.kernel.pdf.canvas.parser.ParserGraphicsState Maven / Gradle / Ivy
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Authors: Bruno Lowagie, Paulo Soares, et al.
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it under the terms of the GNU Affero General Public License version 3
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or FITNESS FOR A PARTICULAR PURPOSE.
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package com.itextpdf.kernel.pdf.canvas.parser;
import com.itextpdf.kernel.geom.Matrix;
import com.itextpdf.kernel.geom.Path;
import com.itextpdf.kernel.geom.ShapeTransformUtil;
import com.itextpdf.kernel.pdf.canvas.CanvasGraphicsState;
import com.itextpdf.kernel.pdf.canvas.PdfCanvasConstants.FillingRule;
import com.itextpdf.kernel.pdf.canvas.parser.clipper.ClipperBridge;
import com.itextpdf.kernel.pdf.canvas.parser.clipper.DefaultClipper;
import com.itextpdf.kernel.pdf.canvas.parser.clipper.IClipper;
import com.itextpdf.kernel.pdf.canvas.parser.clipper.PolyTree;
/**
* Internal class which is essentially a {@link CanvasGraphicsState} which supports tracking of
* clipping path state and changes.
*/
public class ParserGraphicsState extends CanvasGraphicsState {
// NOTE: From the spec default value of this field should be the boundary of the entire imageable portion of the output page.
private Path clippingPath;
/**
* Internal empty and default constructor.
*/
ParserGraphicsState() {
}
/**
* Copy constructor.
*
* @param source the Graphics State to copy from
*/
ParserGraphicsState(ParserGraphicsState source) {
super(source);
if (source.clippingPath != null) {
clippingPath = new Path(source.clippingPath);
}
}
@Override
public void updateCtm(Matrix newCtm) {
super.updateCtm(newCtm);
if (clippingPath != null) {
transformClippingPath(newCtm);
}
}
/**
* Intersects the current clipping path with the given path.
*
* Note: Coordinates of the given path should be in
* the transformed user space.
*
* @param path The path to be intersected with the current clipping path.
* @param fillingRule The filling rule which should be applied to the given path.
* It should be either {@link FillingRule#EVEN_ODD} or
* {@link FillingRule#NONZERO_WINDING}
*/
public void clip(Path path, int fillingRule) {
if (clippingPath == null || clippingPath.isEmpty()) {
return;
}
Path pathCopy = new Path(path);
pathCopy.closeAllSubpaths();
IClipper clipper = new DefaultClipper();
ClipperBridge.addPath(clipper, clippingPath, IClipper.PolyType.SUBJECT);
ClipperBridge.addPath(clipper, pathCopy, IClipper.PolyType.CLIP);
PolyTree resultTree = new PolyTree();
clipper.execute(IClipper.ClipType.INTERSECTION, resultTree, IClipper.PolyFillType.NON_ZERO, ClipperBridge.getFillType(fillingRule));
clippingPath = ClipperBridge.convertToPath(resultTree);
}
/**
* Getter for the current clipping path.
*
* Note: The returned clipping path is in the transformed user space, so
* if you want to get it in default user space, apply transformation matrix ({@link CanvasGraphicsState#getCtm()}).
*
* @return The current clipping path.
*/
public Path getClippingPath() {
return clippingPath;
}
/**
* Sets the current clipping path to the specified path.
*
* Note:This method doesn't modify existing clipping path,
* it simply replaces it with the new one instead.
*
* @param clippingPath New clipping path.
*/
public void setClippingPath(Path clippingPath) {
Path pathCopy = new Path(clippingPath);
pathCopy.closeAllSubpaths();
this.clippingPath = pathCopy;
}
private void transformClippingPath(Matrix newCtm) {
clippingPath = ShapeTransformUtil.transformPath(clippingPath, newCtm);
}
}