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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.components.list;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.geom.Rectangle2D;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperReportsContext;
import net.sf.jasperreports.renderers.AbstractRenderer;
import net.sf.jasperreports.renderers.Graphics2DRenderable;
/**
* Am image renderer used to mark the unused vertical space in a list
* component preview.
*
* @author Lucian Chirita ([email protected])
*/
public class UnusedSpaceImageRenderer extends AbstractRenderer implements Graphics2DRenderable
{
private static final long serialVersionUID = 1L;
// transparent light grey
private static final Color FILL = new Color(224, 224, 224, 128);
public static final UnusedSpaceImageRenderer INSTANCE = new UnusedSpaceImageRenderer();
private final Shape clip;
private final int lineGap = 15;
private final int lineWidth = 10;
public UnusedSpaceImageRenderer()
{
this(null);
}
public UnusedSpaceImageRenderer(Shape clip)
{
this.clip = clip;
}
@Override
public void render(
JasperReportsContext jasperReportsContext,
Graphics2D grx,
Rectangle2D rectangle
) throws JRException
{
Graphics2D graphics = (Graphics2D) grx.create();
try
{
graphics.translate(rectangle.getX(), rectangle.getY());
graphics.setColor(FILL);
if (clip != null)
{
graphics.clip(clip);
}
int width = (int) rectangle.getWidth();
int limit = width + (int) rectangle.getHeight();
int increment = lineGap + lineWidth;
int reverseOffset = (width - 4 * lineWidth / 3) % increment;
for (int x = 0; x <= limit; x += increment)
{
graphics.fillPolygon(
new int[]{x, x + lineWidth, 0, 0},
new int[]{0, 0, x + lineWidth, x},
4);
graphics.fillPolygon(
new int[]{width - x - reverseOffset, width - x - lineWidth - reverseOffset, width, width},
new int[]{0, 0, x + lineWidth, x},
4);
}
}
finally
{
graphics.dispose();
}
}
}