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JFreeChart is a class library, written in Java, for generating charts.
Utilising the Java2D APIs, it currently supports bar charts, pie charts,
line charts, XY-plots and time series plots.
/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2020, 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.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* -------------------
* XYStepRenderer.java
* -------------------
* (C) Copyright 2002-2020, by Roger Studner and Contributors.
*
* Original Author: Roger Studner;
* Contributor(s): David Gilbert (for Object Refinery Limited);
* Matthias Rose;
* Gerald Struck (fix for bug 1569094);
* Ulrich Voigt (patch 1874890);
* Martin Hoeller (contribution to patch 1874890);
* Matthias Noebl (for Cropster GmbH);
*
*/
package org.jfree.chart.renderer.xy;
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.HashUtils;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.labels.XYToolTipGenerator;
import org.jfree.chart.plot.CrosshairState;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.ui.RectangleEdge;
import org.jfree.chart.urls.XYURLGenerator;
import org.jfree.chart.util.LineUtils;
import org.jfree.chart.util.PublicCloneable;
import org.jfree.data.xy.XYDataset;
/**
* Line/Step item renderer for an {@link XYPlot}. This class draws lines
* between data points, only allowing horizontal or vertical lines (steps).
* The example shown here is generated by the
* {@code XYStepRendererDemo1.java} program included in the JFreeChart
* demo collection:
*
* 
*/
public class XYStepRenderer extends XYLineAndShapeRenderer
implements XYItemRenderer, Cloneable, PublicCloneable, Serializable {
/** For serialization. */
private static final long serialVersionUID = -8918141928884796108L;
/**
* The factor (from 0.0 to 1.0) that determines the position of the
* step.
*
* @since 1.0.10.
*/
private double stepPoint = 1.0d;
/**
* Constructs a new renderer with no tooltip or URL generation.
*/
public XYStepRenderer() {
this(null, null);
}
/**
* Constructs a new renderer with the specified tool tip and URL
* generators.
*
* @param toolTipGenerator the item label generator ({@code null}
* permitted).
* @param urlGenerator the URL generator ({@code null} permitted).
*/
public XYStepRenderer(XYToolTipGenerator toolTipGenerator,
XYURLGenerator urlGenerator) {
super();
setDefaultToolTipGenerator(toolTipGenerator);
setURLGenerator(urlGenerator);
setDefaultShapesVisible(false);
}
/**
* Returns the fraction of the domain position between two points on which
* the step is drawn. The default is 1.0d, which means the step is drawn
* at the domain position of the second`point. If the stepPoint is 0.5d the
* step is drawn at half between the two points.
*
* @return The fraction of the domain position between two points where the
* step is drawn.
*
* @see #setStepPoint(double)
*
* @since 1.0.10
*/
public double getStepPoint() {
return this.stepPoint;
}
/**
* Sets the step point and sends a {@link RendererChangeEvent} to all
* registered listeners.
*
* @param stepPoint the step point (in the range 0.0 to 1.0)
*
* @see #getStepPoint()
*
* @since 1.0.10
*/
public void setStepPoint(double stepPoint) {
if (stepPoint < 0.0d || stepPoint > 1.0d) {
throw new IllegalArgumentException(
"Requires stepPoint in [0.0;1.0]");
}
this.stepPoint = stepPoint;
fireChangeEvent();
}
/**
* Draws the visual representation of a single data item.
*
* @param g2 the graphics device.
* @param state the renderer state.
* @param dataArea the area within which the data is being drawn.
* @param info collects information about the drawing.
* @param plot the plot (can be used to obtain standard color
* information etc).
* @param domainAxis the domain axis.
* @param rangeAxis the vertical axis.
* @param dataset the dataset.
* @param series the series index (zero-based).
* @param item the item index (zero-based).
* @param crosshairState crosshair information for the plot
* ({@code null} permitted).
* @param pass the pass index.
*/
@Override
public void drawItem(Graphics2D g2, XYItemRendererState state,
Rectangle2D dataArea, PlotRenderingInfo info, XYPlot plot,
ValueAxis domainAxis, ValueAxis rangeAxis, XYDataset dataset,
int series, int item, CrosshairState crosshairState, int pass) {
// do nothing if item is not visible
if (!getItemVisible(series, item)) {
return;
}
PlotOrientation orientation = plot.getOrientation();
Paint seriesPaint = getItemPaint(series, item);
Stroke seriesStroke = getItemStroke(series, item);
g2.setPaint(seriesPaint);
g2.setStroke(seriesStroke);
// get the data point...
double x1 = dataset.getXValue(series, item);
double y1 = dataset.getYValue(series, item);
RectangleEdge xAxisLocation = plot.getDomainAxisEdge();
RectangleEdge yAxisLocation = plot.getRangeAxisEdge();
double transX1 = domainAxis.valueToJava2D(x1, dataArea, xAxisLocation);
double transY1 = (Double.isNaN(y1) ? Double.NaN
: rangeAxis.valueToJava2D(y1, dataArea, yAxisLocation));
if (pass == 0 && item > 0) {
// get the previous data point...
double x0 = dataset.getXValue(series, item - 1);
double y0 = dataset.getYValue(series, item - 1);
double transX0 = domainAxis.valueToJava2D(x0, dataArea,
xAxisLocation);
double transY0 = (Double.isNaN(y0) ? Double.NaN
: rangeAxis.valueToJava2D(y0, dataArea, yAxisLocation));
if (orientation == PlotOrientation.HORIZONTAL) {
if (transY0 == transY1) {
// this represents the situation
// for drawing a horizontal bar.
drawLine(g2, state.workingLine, transY0, transX0, transY1,
transX1, dataArea);
}
else { //this handles the need to perform a 'step'.
// calculate the step point
double transXs = transX0 + (getStepPoint()
* (transX1 - transX0));
drawLine(g2, state.workingLine, transY0, transX0, transY0,
transXs, dataArea);
drawLine(g2, state.workingLine, transY0, transXs, transY1,
transXs, dataArea);
drawLine(g2, state.workingLine, transY1, transXs, transY1,
transX1, dataArea);
}
}
else if (orientation == PlotOrientation.VERTICAL) {
if (transY0 == transY1) { // this represents the situation
// for drawing a horizontal bar.
drawLine(g2, state.workingLine, transX0, transY0, transX1,
transY1, dataArea);
}
else { //this handles the need to perform a 'step'.
// calculate the step point
double transXs = transX0 + (getStepPoint()
* (transX1 - transX0));
drawLine(g2, state.workingLine, transX0, transY0, transXs,
transY0, dataArea);
drawLine(g2, state.workingLine, transXs, transY0, transXs,
transY1, dataArea);
drawLine(g2, state.workingLine, transXs, transY1, transX1,
transY1, dataArea);
}
}
// submit this data item as a candidate for the crosshair point
int datasetIndex = plot.indexOf(dataset);
updateCrosshairValues(crosshairState, x1, y1, datasetIndex,
transX1, transY1, orientation);
// collect entity and tool tip information...
EntityCollection entities = state.getEntityCollection();
if (entities != null) {
if (orientation == PlotOrientation.HORIZONTAL) {
addEntity(entities, null, dataset, series, item, transY1,
transX1);
} else {
addEntity(entities, null, dataset, series, item, transX1,
transY1);
}
}
}
if (pass == 1) {
// draw the item label if there is one...
if (isItemLabelVisible(series, item)) {
double xx = transX1;
double yy = transY1;
if (orientation == PlotOrientation.HORIZONTAL) {
xx = transY1;
yy = transX1;
}
drawItemLabel(g2, orientation, dataset, series, item, xx, yy,
(y1 < 0.0));
}
}
}
/**
* A utility method that draws a line but only if none of the coordinates
* are NaN values.
*
* @param g2 the graphics target.
* @param line the line object.
* @param x0 the x-coordinate for the starting point of the line.
* @param y0 the y-coordinate for the starting point of the line.
* @param x1 the x-coordinate for the ending point of the line.
* @param y1 the y-coordinate for the ending point of the line.
*/
private void drawLine(Graphics2D g2, Line2D line, double x0, double y0,
double x1, double y1, Rectangle2D dataArea) {
if (Double.isNaN(x0) || Double.isNaN(x1) || Double.isNaN(y0)
|| Double.isNaN(y1)) {
return;
}
line.setLine(x0, y0, x1, y1);
boolean visible = LineUtils.clipLine(line, dataArea);
if (visible) {
g2.draw(line);
}
}
/**
* Tests this renderer for equality with an arbitrary object.
*
* @param obj the object ({@code null} permitted).
*
* @return A boolean.
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof XYLineAndShapeRenderer)) {
return false;
}
XYStepRenderer that = (XYStepRenderer) obj;
if (this.stepPoint != that.stepPoint) {
return false;
}
return super.equals(obj);
}
/**
* Returns a hash code for this instance.
*
* @return A hash code.
*/
@Override
public int hashCode() {
return HashUtils.hashCode(super.hashCode(), this.stepPoint);
}
/**
* Returns a clone of the renderer.
*
* @return A clone.
*
* @throws CloneNotSupportedException if the renderer cannot be cloned.
*/
@Override
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
}