/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* This library 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 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ------------------
* LevelRenderer.java
* ------------------
* (C) Copyright 2004-2007, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes
* -------
* 09-Jan-2004 : Version 1 (DG);
* 05-Nov-2004 : Modified drawItem() signature (DG);
* 20-Apr-2005 : Renamed CategoryLabelGenerator
* --> CategoryItemLabelGenerator (DG);
* ------------- JFREECHART 1.0.x ---------------------------------------------
* 23-Jan-2006 : Renamed getMaxItemWidth() --> getMaximumItemWidth() (DG);
*
*/
package org.jfree.chart.renderer.category;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.CategoryItemEntity;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.labels.CategoryItemLabelGenerator;
import org.jfree.chart.labels.CategoryToolTipGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.data.category.CategoryDataset;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.PublicCloneable;
/**
* A {@link CategoryItemRenderer} that draws individual data items as
* horizontal lines, spaced in the same way as bars in a bar chart.
*/
public class LevelRenderer extends AbstractCategoryItemRenderer
implements Cloneable, PublicCloneable, Serializable {
/** For serialization. */
private static final long serialVersionUID = -8204856624355025117L;
/** The default item margin percentage. */
public static final double DEFAULT_ITEM_MARGIN = 0.20;
/** The margin between items within a category. */
private double itemMargin;
/** The maximum item width as a percentage of the available space. */
private double maxItemWidth;
/**
* Creates a new renderer with default settings.
*/
public LevelRenderer() {
super();
this.itemMargin = DEFAULT_ITEM_MARGIN;
this.maxItemWidth = 1.0; // 100 percent, so it will not apply unless
// changed
}
/**
* Returns the item margin.
*
* @return The margin.
*/
public double getItemMargin() {
return this.itemMargin;
}
/**
* Sets the item margin and sends a {@link RendererChangeEvent} to all
* registered listeners. The value is expressed as a percentage of the
* available width for plotting all the bars, with the resulting amount to
* be distributed between all the bars evenly.
*
* @param percent the new margin.
*/
public void setItemMargin(double percent) {
this.itemMargin = percent;
fireChangeEvent();
}
/**
* Returns the maximum width, as a percentage of the available drawing
* space.
*
* @return The maximum width.
*
* @deprecated Use {@link #getMaximumItemWidth()} instead.
*/
public double getMaxItemWidth() {
return this.maxItemWidth;
}
/**
* Sets the maximum item width, which is specified as a percentage of the
* available space for all items, and sends a {@link RendererChangeEvent}
* to all registered listeners.
*
* @param percent the percent.
*
* @deprecated Use {@link #setMaximumItemWidth(double)} instead.
*/
public void setMaxItemWidth(double percent) {
this.maxItemWidth = percent;
fireChangeEvent();
}
/**
* Returns the maximum width, as a percentage of the available drawing
* space.
*
* @return The maximum width.
*/
public double getMaximumItemWidth() {
return getMaxItemWidth();
}
/**
* Sets the maximum item width, which is specified as a percentage of the
* available space for all items, and sends a {@link RendererChangeEvent}
* to all registered listeners.
*
* @param percent the percent.
*/
public void setMaximumItemWidth(double percent) {
setMaxItemWidth(percent);
}
/**
* Initialises the renderer and returns a state object that will be passed
* to subsequent calls to the drawItem method.
* <p>
* This method gets called once at the start of the process of drawing a
* chart.
*
* @param g2 the graphics device.
* @param dataArea the area in which the data is to be plotted.
* @param plot the plot.
* @param rendererIndex the renderer index.
* @param info collects chart rendering information for return to caller.
*
* @return The renderer state.
*
*/
public CategoryItemRendererState initialise(Graphics2D g2,
Rectangle2D dataArea,
CategoryPlot plot,
int rendererIndex,
PlotRenderingInfo info) {
CategoryItemRendererState state = super.initialise(g2, dataArea, plot,
rendererIndex, info);
calculateItemWidth(plot, dataArea, rendererIndex, state);
return state;
}
/**
* Calculates the bar width and stores it in the renderer state.
*
* @param plot the plot.
* @param dataArea the data area.
* @param rendererIndex the renderer index.
* @param state the renderer state.
*/
protected void calculateItemWidth(CategoryPlot plot,
Rectangle2D dataArea,
int rendererIndex,
CategoryItemRendererState state) {
CategoryAxis domainAxis = getDomainAxis(plot, rendererIndex);
CategoryDataset dataset = plot.getDataset(rendererIndex);
if (dataset != null) {
int columns = dataset.getColumnCount();
int rows = dataset.getRowCount();
double space = 0.0;
PlotOrientation orientation = plot.getOrientation();
if (orientation == PlotOrientation.HORIZONTAL) {
space = dataArea.getHeight();
}
else if (orientation == PlotOrientation.VERTICAL) {
space = dataArea.getWidth();
}
double maxWidth = space * getMaxItemWidth();
double categoryMargin = 0.0;
double currentItemMargin = 0.0;
if (columns > 1) {
categoryMargin = domainAxis.getCategoryMargin();
}
if (rows > 1) {
currentItemMargin = getItemMargin();
}
double used = space * (1 - domainAxis.getLowerMargin()
- domainAxis.getUpperMargin()
- categoryMargin - currentItemMargin);
if ((rows * columns) > 0) {
state.setBarWidth(Math.min(used / (rows * columns), maxWidth));
}
else {
state.setBarWidth(Math.min(used, maxWidth));
}
}
}
/**
* Calculates the coordinate of the first "side" of a bar. This will be
* the minimum x-coordinate for a vertical bar, and the minimum
* y-coordinate for a horizontal bar.
*
* @param plot the plot.
* @param orientation the plot orientation.
* @param dataArea the data area.
* @param domainAxis the domain axis.
* @param state the renderer state (has the bar width precalculated).
* @param row the row index.
* @param column the column index.
*
* @return The coordinate.
*/
protected double calculateBarW0(CategoryPlot plot,
PlotOrientation orientation,
Rectangle2D dataArea,
CategoryAxis domainAxis,
CategoryItemRendererState state,
int row,
int column) {
// calculate bar width...
double space = 0.0;
if (orientation == PlotOrientation.HORIZONTAL) {
space = dataArea.getHeight();
}
else {
space = dataArea.getWidth();
}
double barW0 = domainAxis.getCategoryStart(column, getColumnCount(),
dataArea, plot.getDomainAxisEdge());
int seriesCount = getRowCount();
int categoryCount = getColumnCount();
if (seriesCount > 1) {
double seriesGap = space * getItemMargin()
/ (categoryCount * (seriesCount - 1));
double seriesW = calculateSeriesWidth(space, domainAxis,
categoryCount, seriesCount);
barW0 = barW0 + row * (seriesW + seriesGap)
+ (seriesW / 2.0) - (state.getBarWidth() / 2.0);
}
else {
barW0 = domainAxis.getCategoryMiddle(column, getColumnCount(),
dataArea, plot.getDomainAxisEdge()) - state.getBarWidth()
/ 2.0;
}
return barW0;
}
/**
* Draws the bar for a single (series, category) data item.
*
* @param g2 the graphics device.
* @param state the renderer state.
* @param dataArea the data area.
* @param plot the plot.
* @param domainAxis the domain axis.
* @param rangeAxis the range axis.
* @param dataset the dataset.
* @param row the row index (zero-based).
* @param column the column index (zero-based).
* @param pass the pass index.
*/
public void drawItem(Graphics2D g2, CategoryItemRendererState state,
Rectangle2D dataArea, CategoryPlot plot, CategoryAxis domainAxis,
ValueAxis rangeAxis, CategoryDataset dataset, int row, int column,
int pass) {
// nothing is drawn for null values...
Number dataValue = dataset.getValue(row, column);
if (dataValue == null) {
return;
}
double value = dataValue.doubleValue();
PlotOrientation orientation = plot.getOrientation();
double barW0 = calculateBarW0(plot, orientation, dataArea, domainAxis,
state, row, column);
RectangleEdge edge = plot.getRangeAxisEdge();
double barL = rangeAxis.valueToJava2D(value, dataArea, edge);
// draw the bar...
Line2D line = null;
double x = 0.0;
double y = 0.0;
if (orientation == PlotOrientation.HORIZONTAL) {
x = barL;
y = barW0 + state.getBarWidth() / 2.0;
line = new Line2D.Double(barL, barW0, barL,
barW0 + state.getBarWidth());
}
else {
x = barW0 + state.getBarWidth() / 2.0;
y = barL;
line = new Line2D.Double(barW0, barL, barW0 + state.getBarWidth(),
barL);
}
Stroke itemStroke = getItemStroke(row, column);
Paint itemPaint = getItemPaint(row, column);
g2.setStroke(itemStroke);
g2.setPaint(itemPaint);
g2.draw(line);
CategoryItemLabelGenerator generator = getItemLabelGenerator(row,
column);
if (generator != null && isItemLabelVisible(row, column)) {
drawItemLabel(g2, orientation, dataset, row, column, x, y,
(value < 0.0));
}
// collect entity and tool tip information...
if (state.getInfo() != null) {
EntityCollection entities = state.getEntityCollection();
if (entities != null) {
String tip = null;
CategoryToolTipGenerator tipster = getToolTipGenerator(row,
column);
if (tipster != null) {
tip = tipster.generateToolTip(dataset, row, column);
}
String url = null;
if (getItemURLGenerator(row, column) != null) {
url = getItemURLGenerator(row, column).generateURL(dataset,
row, column);
}
CategoryItemEntity entity = new CategoryItemEntity(
line.getBounds(), tip, url, dataset,
dataset.getRowKey(row), dataset.getColumnKey(column));
entities.add(entity);
}
}
}
/**
* Calculates the available space for each series.
*
* @param space the space along the entire axis (in Java2D units).
* @param axis the category axis.
* @param categories the number of categories.
* @param series the number of series.
*
* @return The width of one series.
*/
protected double calculateSeriesWidth(double space, CategoryAxis axis,
int categories, int series) {
double factor = 1.0 - getItemMargin() - axis.getLowerMargin()
- axis.getUpperMargin();
if (categories > 1) {
factor = factor - axis.getCategoryMargin();
}
return (space * factor) / (categories * series);
}
/**
* Tests an object for equality with this instance.
*
* @param obj the object (<code>null</code> permitted).
*
* @return A boolean.
*/
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof LevelRenderer)) {
return false;
}
if (!super.equals(obj)) {
return false;
}
LevelRenderer that = (LevelRenderer) obj;
if (this.itemMargin != that.itemMargin) {
return false;
}
if (this.maxItemWidth != that.maxItemWidth) {
return false;
}
return true;
}
}