org.jfree.chart.renderer.xy.XYStepRenderer Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jfreechart Show documentation
Show all versions of jfreechart Show documentation
JFreeChart is a class library, written in Java, for generating charts.
Utilising the Java2D API, it supports a wide range of chart types including
bar charts, pie charts, line charts, XY-plots, time series plots, Sankey charts
and more.
/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-present, by David Gilbert 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-present, by Roger Studner and Contributors.
*
* Original Author: Roger Studner;
* Contributor(s): David Gilbert;
* 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.
*/
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)
*/
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()
*/
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();
}
}