org.apache.pdfbox.pdmodel.graphics.shading.Type7ShadingPaint Maven / Gradle / Ivy
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The Apache PDFBox library is an open source Java tool for working with PDF documents.
/*
* Copyright 2014 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.pdfbox.pdmodel.graphics.shading;
import java.awt.Color;
import java.awt.Paint;
import java.awt.PaintContext;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.image.ColorModel;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pdfbox.util.Matrix;
/**
* AWT Paint for tensor-product patch meshes (Type 7) shading. This was done as
* part of GSoC2014, Tilman Hausherr is the mentor.
*
* @author Shaola Ren
*/
class Type7ShadingPaint implements Paint
{
private static final Log LOG = LogFactory.getLog(Type7ShadingPaint.class);
private final PDShadingType7 shading;
private final Matrix matrix;
/**
* Constructor.
*
* @param shading the shading resources
* @param matrix the pattern matrix concatenated with that of the parent content stream
*/
Type7ShadingPaint(PDShadingType7 shading, Matrix matrix)
{
this.shading = shading;
this.matrix = matrix;
}
@Override
public int getTransparency()
{
return 0;
}
@Override
public PaintContext createContext(ColorModel cm, Rectangle deviceBounds, Rectangle2D userBounds,
AffineTransform xform, RenderingHints hints)
{
try
{
return new Type7ShadingContext(shading, cm, xform, matrix, deviceBounds);
}
catch (IOException e)
{
LOG.error("An error occurred while painting", e);
return new Color(0, 0, 0, 0).createContext(cm, deviceBounds, userBounds, xform, hints);
}
}
}