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Free Java Reporting Library
/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2019 TIBCO Software Inc. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports 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 3 of the License, or
* (at your option) any later version.
*
* JasperReports 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 JasperReports. If not, see .
*/
package net.sf.jasperreports.renderers;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.geom.Dimension2D;
import java.awt.image.BufferedImage;
import net.sf.jasperreports.engine.JRConstants;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperReportsContext;
import net.sf.jasperreports.engine.type.ImageTypeEnum;
import net.sf.jasperreports.engine.util.JRImageLoader;
/**
* @author Teodor Danciu ([email protected])
*/
public abstract class AbstractRenderToImageDataRenderer extends AbstractRenderToImageAwareRenderer implements Graphics2DRenderable, DataRenderable, DimensionRenderable
{
/**
*
*/
private static final long serialVersionUID = JRConstants.SERIAL_VERSION_UID;
public static final String EXCEPTION_MESSAGE_KEY_DIMENSION_MUST_OVERRIDE = "engine.renderable.svg.dimension.must.override";
public static final String EXCEPTION_MESSAGE_KEY_DIMENSION_NULL_NOT_ALLOWED = "engine.renderable.svg.dimension.null.not.allowed";
@Override
public Dimension2D getDimension(JasperReportsContext jasperReportsContext) throws JRException
{
throw
new JRException(
EXCEPTION_MESSAGE_KEY_DIMENSION_MUST_OVERRIDE,
new Object[]{this.getClass().getName()}
);
}
@Override
public byte[] getData(JasperReportsContext jasperReportsContext) throws JRException
{
Dimension2D dimension = getDimension(jasperReportsContext);
if (dimension == null)
{
throw
new JRException(
EXCEPTION_MESSAGE_KEY_DIMENSION_NULL_NOT_ALLOWED,
(Object[])null
);
}
int dpi = getImageDataDPI(jasperReportsContext);
double scale = dpi/72d;
BufferedImage bi =
new BufferedImage(
(int) (scale * dimension.getWidth()),
(int) (scale * dimension.getHeight()),
BufferedImage.TYPE_INT_ARGB // always produce PNGs with transparency
);
Graphics2D g = createGraphics(bi);
try
{
g.scale(scale, scale);
Color backcolor = getBackcolor();
if (backcolor != null)
{
g.setColor(backcolor);
g.fillRect(0, 0, (int)dimension.getWidth(), (int)dimension.getHeight());
}
render(jasperReportsContext, g, new Rectangle((int)dimension.getWidth(), (int)dimension.getHeight()));
}
finally
{
g.dispose();
}
return JRImageLoader.getInstance(jasperReportsContext).loadBytesFromAwtImage(bi, ImageTypeEnum.PNG); // always produce PNGs with transparency
}
protected Color getBackcolor()
{
return null;
}
}