/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2011, 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.]
*
* -----------------------
* XYStepAreaRenderer.java
* -----------------------
* (C) Copyright 2003-2009, by Matthias Rose and Contributors.
*
* Original Author: Matthias Rose (based on XYAreaRenderer.java);
* Contributor(s): David Gilbert (for Object Refinery Limited);
*
* Changes:
* --------
* 07-Oct-2003 : Version 1, contributed by Matthias Rose (DG);
* 10-Feb-2004 : Added some getter and setter methods (DG);
* 25-Feb-2004 : Replaced CrosshairInfo with CrosshairState. Renamed
* XYToolTipGenerator --> XYItemLabelGenerator (DG);
* 15-Jul-2004 : Switched getX() with getXValue() and getY() with
* getYValue() (DG);
* 11-Nov-2004 : Now uses ShapeUtilities to translate shapes (DG);
* 06-Jul-2005 : Renamed get/setPlotShapes() --> get/setShapesVisible() (DG);
* ------------- JFREECHART 1.0.x ---------------------------------------------
* 06-Jul-2006 : Modified to call dataset methods that return double
* primitives only (DG);
* 06-Feb-2007 : Fixed bug 1086307, crosshairs with multiple axes (DG);
* 14-Feb-2007 : Added equals() method override (DG);
* 04-May-2007 : Set processVisibleItemsOnly flag to false (DG);
* 14-May-2008 : Call addEntity() from within drawItem() (DG);
* 19-May-2009 : Fixed FindBugs warnings, patch by Michal Wozniak (DG);
*
*/
package org.jfree.chart.renderer.xy;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Polygon;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
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.urls.XYURLGenerator;
import org.jfree.data.xy.XYDataset;
import org.jfree.util.PublicCloneable;
import org.jfree.util.ShapeUtilities;
/**
* A step chart renderer that fills the area between the step and the x-axis.
* The example shown here is generated by the
* <code>XYStepAreaRendererDemo1.java</code> program included in the JFreeChart
* demo collection:
* <br><br>
* <img src="../../../../../images/XYStepAreaRendererSample.png"
* alt="XYStepAreaRendererSample.png" />
*/
public class XYStepAreaRenderer extends AbstractXYItemRenderer
implements XYItemRenderer, Cloneable, PublicCloneable, Serializable {
/** For serialization. */
private static final long serialVersionUID = -7311560779702649635L;
/** Useful constant for specifying the type of rendering (shapes only). */
public static final int SHAPES = 1;
/** Useful constant for specifying the type of rendering (area only). */
public static final int AREA = 2;
/**
* Useful constant for specifying the type of rendering (area and shapes).
*/
public static final int AREA_AND_SHAPES = 3;
/** A flag indicating whether or not shapes are drawn at each XY point. */
private boolean shapesVisible;
/** A flag that controls whether or not shapes are filled for ALL series. */
private boolean shapesFilled;
/** A flag indicating whether or not Area are drawn at each XY point. */
private boolean plotArea;
/** A flag that controls whether or not the outline is shown. */
private boolean showOutline;
/** Area of the complete series */
protected transient Polygon pArea = null;
/**
* The value on the range axis which defines the 'lower' border of the
* area.
*/
private double rangeBase;
/**
* Constructs a new renderer.
*/
public XYStepAreaRenderer() {
this(AREA);
}
/**
* Constructs a new renderer.
*
* @param type the type of the renderer.
*/
public XYStepAreaRenderer(int type) {
this(type, null, null);
}
/**
* Constructs a new renderer.
* <p>
* To specify the type of renderer, use one of the constants:
* AREA, SHAPES or AREA_AND_SHAPES.
*
* @param type the type of renderer.
* @param toolTipGenerator the tool tip generator to use
* (<code>null</code> permitted).
* @param urlGenerator the URL generator (<code>null</code> permitted).
*/
public XYStepAreaRenderer(int type,
XYToolTipGenerator toolTipGenerator,
XYURLGenerator urlGenerator) {
super();
setBaseToolTipGenerator(toolTipGenerator);
setURLGenerator(urlGenerator);
if (type == AREA) {
this.plotArea = true;
}
else if (type == SHAPES) {
this.shapesVisible = true;
}
else if (type == AREA_AND_SHAPES) {
this.plotArea = true;
this.shapesVisible = true;
}
this.showOutline = false;
}
/**
* Returns a flag that controls whether or not outlines of the areas are
* drawn.
*
* @return The flag.
*
* @see #setOutline(boolean)
*/
public boolean isOutline() {
return this.showOutline;
}
/**
* Sets a flag that controls whether or not outlines of the areas are
* drawn, and sends a {@link RendererChangeEvent} to all registered
* listeners.
*
* @param show the flag.
*
* @see #isOutline()
*/
public void setOutline(boolean show) {
this.showOutline = show;
fireChangeEvent();
}
/**
* Returns true if shapes are being plotted by the renderer.
*
* @return <code>true</code> if shapes are being plotted by the renderer.
*
* @see #setShapesVisible(boolean)
*/
public boolean getShapesVisible() {
return this.shapesVisible;
}
/**
* Sets the flag that controls whether or not shapes are displayed for each
* data item, and sends a {@link RendererChangeEvent} to all registered
* listeners.
*
* @param flag the flag.
*
* @see #getShapesVisible()
*/
public void setShapesVisible(boolean flag) {
this.shapesVisible = flag;
fireChangeEvent();
}
/**
* Returns the flag that controls whether or not the shapes are filled.
*
* @return A boolean.
*
* @see #setShapesFilled(boolean)
*/
public boolean isShapesFilled() {
return this.shapesFilled;
}
/**
* Sets the 'shapes filled' for ALL series and sends a
* {@link RendererChangeEvent} to all registered listeners.
*
* @param filled the flag.
*
* @see #isShapesFilled()
*/
public void setShapesFilled(boolean filled) {
this.shapesFilled = filled;
fireChangeEvent();
}
/**
* Returns true if Area is being plotted by the renderer.
*
* @return <code>true</code> if Area is being plotted by the renderer.
*
* @see #setPlotArea(boolean)
*/
public boolean getPlotArea() {
return this.plotArea;
}
/**
* Sets a flag that controls whether or not areas are drawn for each data
* item and sends a {@link RendererChangeEvent} to all registered
* listeners.
*
* @param flag the flag.
*
* @see #getPlotArea()
*/
public void setPlotArea(boolean flag) {
this.plotArea = flag;
fireChangeEvent();
}
/**
* Returns the value on the range axis which defines the 'lower' border of
* the area.
*
* @return <code>double</code> the value on the range axis which defines
* the 'lower' border of the area.
*
* @see #setRangeBase(double)
*/
public double getRangeBase() {
return this.rangeBase;
}
/**
* Sets the value on the range axis which defines the default border of the
* area, and sends a {@link RendererChangeEvent} to all registered
* listeners. E.g. setRangeBase(Double.NEGATIVE_INFINITY) lets areas always
* reach the lower border of the plotArea.
*
* @param val the value on the range axis which defines the default border
* of the area.
*
* @see #getRangeBase()
*/
public void setRangeBase(double val) {
this.rangeBase = val;
fireChangeEvent();
}
/**
* Initialises the renderer. Here we calculate the Java2D y-coordinate for
* zero, since all the bars have their bases fixed at zero.
*
* @param g2 the graphics device.
* @param dataArea the area inside the axes.
* @param plot the plot.
* @param data the data.
* @param info an optional info collection object to return data back to
* the caller.
*
* @return The number of passes required by the renderer.
*/
public XYItemRendererState initialise(Graphics2D g2,
Rectangle2D dataArea,
XYPlot plot,
XYDataset data,
PlotRenderingInfo info) {
XYItemRendererState state = super.initialise(g2, dataArea, plot, data,
info);
// disable visible items optimisation - it doesn't work for this
// renderer...
state.setProcessVisibleItemsOnly(false);
return state;
}
/**
* 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 range 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</code> permitted).
* @param pass the pass index.
*/
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) {
PlotOrientation orientation = plot.getOrientation();
// Get the item count for the series, so that we can know which is the
// end of the series.
int itemCount = dataset.getItemCount(series);
Paint paint = getItemPaint(series, item);
Stroke seriesStroke = getItemStroke(series, item);
g2.setPaint(paint);
g2.setStroke(seriesStroke);
// get the data point...
double x1 = dataset.getXValue(series, item);
double y1 = dataset.getYValue(series, item);
double x = x1;
double y = Double.isNaN(y1) ? getRangeBase() : y1;
double transX1 = domainAxis.valueToJava2D(x, dataArea,
plot.getDomainAxisEdge());
double transY1 = rangeAxis.valueToJava2D(y, dataArea,
plot.getRangeAxisEdge());
// avoid possible sun.dc.pr.PRException: endPath: bad path
transY1 = restrictValueToDataArea(transY1, plot, dataArea);
if (this.pArea == null && !Double.isNaN(y1)) {
// Create a new Area for the series
this.pArea = new Polygon();
// start from Y = rangeBase
double transY2 = rangeAxis.valueToJava2D(getRangeBase(), dataArea,
plot.getRangeAxisEdge());
// avoid possible sun.dc.pr.PRException: endPath: bad path
transY2 = restrictValueToDataArea(transY2, plot, dataArea);
// The first point is (x, this.baseYValue)
if (orientation == PlotOrientation.VERTICAL) {
this.pArea.addPoint((int) transX1, (int) transY2);
}
else if (orientation == PlotOrientation.HORIZONTAL) {
this.pArea.addPoint((int) transY2, (int) transX1);
}
}
double transX0 = 0;
double transY0;
double x0;
double y0;
if (item > 0) {
// get the previous data point...
x0 = dataset.getXValue(series, item - 1);
y0 = Double.isNaN(y1) ? y1 : dataset.getYValue(series, item - 1);
x = x0;
y = Double.isNaN(y0) ? getRangeBase() : y0;
transX0 = domainAxis.valueToJava2D(x, dataArea,
plot.getDomainAxisEdge());
transY0 = rangeAxis.valueToJava2D(y, dataArea,
plot.getRangeAxisEdge());
// avoid possible sun.dc.pr.PRException: endPath: bad path
transY0 = restrictValueToDataArea(transY0, plot, dataArea);
if (Double.isNaN(y1)) {
// NULL value -> insert point on base line
// instead of 'step point'
transX1 = transX0;
transY0 = transY1;
}
if (transY0 != transY1) {
// not just a horizontal bar but need to perform a 'step'.
if (orientation == PlotOrientation.VERTICAL) {
this.pArea.addPoint((int) transX1, (int) transY0);
}
else if (orientation == PlotOrientation.HORIZONTAL) {
this.pArea.addPoint((int) transY0, (int) transX1);
}
}
}
Shape shape = null;
if (!Double.isNaN(y1)) {
// Add each point to Area (x, y)
if (orientation == PlotOrientation.VERTICAL) {
this.pArea.addPoint((int) transX1, (int) transY1);
}
else if (orientation == PlotOrientation.HORIZONTAL) {
this.pArea.addPoint((int) transY1, (int) transX1);
}
if (getShapesVisible()) {
shape = getItemShape(series, item);
if (orientation == PlotOrientation.VERTICAL) {
shape = ShapeUtilities.createTranslatedShape(shape,
transX1, transY1);
}
else if (orientation == PlotOrientation.HORIZONTAL) {
shape = ShapeUtilities.createTranslatedShape(shape,
transY1, transX1);
}
if (isShapesFilled()) {
g2.fill(shape);
}
else {
g2.draw(shape);
}
}
else {
if (orientation == PlotOrientation.VERTICAL) {
shape = new Rectangle2D.Double(transX1 - 2, transY1 - 2,
4.0, 4.0);
}
else if (orientation == PlotOrientation.HORIZONTAL) {
shape = new Rectangle2D.Double(transY1 - 2, transX1 - 2,
4.0, 4.0);
}
}
}
// Check if the item is the last item for the series or if it
// is a NULL value and number of items > 0. We can't draw an area for
// a single point.
if (getPlotArea() && item > 0 && this.pArea != null
&& (item == (itemCount - 1) || Double.isNaN(y1))) {
double transY2 = rangeAxis.valueToJava2D(getRangeBase(), dataArea,
plot.getRangeAxisEdge());
// avoid possible sun.dc.pr.PRException: endPath: bad path
transY2 = restrictValueToDataArea(transY2, plot, dataArea);
if (orientation == PlotOrientation.VERTICAL) {
// Add the last point (x,0)
this.pArea.addPoint((int) transX1, (int) transY2);
}
else if (orientation == PlotOrientation.HORIZONTAL) {
// Add the last point (x,0)
this.pArea.addPoint((int) transY2, (int) transX1);
}
// fill the polygon
g2.fill(this.pArea);
// draw an outline around the Area.
if (isOutline()) {
g2.setStroke(plot.getOutlineStroke());
g2.setPaint(plot.getOutlinePaint());
g2.draw(this.pArea);
}
// start new area when needed (see above)
this.pArea = null;
}
// do we need to update the crosshair values?
if (!Double.isNaN(y1)) {
int domainAxisIndex = plot.getDomainAxisIndex(domainAxis);
int rangeAxisIndex = plot.getRangeAxisIndex(rangeAxis);
updateCrosshairValues(crosshairState, x1, y1, domainAxisIndex,
rangeAxisIndex, transX1, transY1, orientation);
}
// collect entity and tool tip information...
EntityCollection entities = state.getEntityCollection();
if (entities != null) {
addEntity(entities, shape, dataset, series, item, transX1, transY1);
}
}
/**
* Tests this renderer for equality with an arbitrary object.
*
* @param obj the object (<code>null</code> permitted).
*
* @return A boolean.
*/
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof XYStepAreaRenderer)) {
return false;
}
XYStepAreaRenderer that = (XYStepAreaRenderer) obj;
if (this.showOutline != that.showOutline) {
return false;
}
if (this.shapesVisible != that.shapesVisible) {
return false;
}
if (this.shapesFilled != that.shapesFilled) {
return false;
}
if (this.plotArea != that.plotArea) {
return false;
}
if (this.rangeBase != that.rangeBase) {
return false;
}
return super.equals(obj);
}
/**
* Returns a clone of the renderer.
*
* @return A clone.
*
* @throws CloneNotSupportedException if the renderer cannot be cloned.
*/
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
/**
* Helper method which returns a value if it lies
* inside the visible dataArea and otherwise the corresponding
* coordinate on the border of the dataArea. The PlotOrientation
* is taken into account.
* Useful to avoid possible sun.dc.pr.PRException: endPath: bad path
* which occurs when trying to draw lines/shapes which in large part
* lie outside of the visible dataArea.
*
* @param value the value which shall be
* @param dataArea the area within which the data is being drawn.
* @param plot the plot (can be used to obtain standard color
* information etc).
* @return <code>double</code> value inside the data area.
*/
protected static double restrictValueToDataArea(double value,
XYPlot plot,
Rectangle2D dataArea) {
double min = 0;
double max = 0;
if (plot.getOrientation() == PlotOrientation.VERTICAL) {
min = dataArea.getMinY();
max = dataArea.getMaxY();
}
else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
min = dataArea.getMinX();
max = dataArea.getMaxX();
}
if (value < min) {
value = min;
}
else if (value > max) {
value = max;
}
return value;
}
}
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