我可以XYPlot在 JFreeChart 中的图表中添加渐变填充吗？
下面的例子：
问问题
1667 次
3 回答
1
我没有尝试过，但是org.jfree.chart.renderer.xy.StackedXYAreaRenderer有一个setSeriesFillPaint()方法并java.awt.GradientPaint实现了Paint接口。
于 2013-01-18T19:27:58.220 回答
0
我发现这适用于XYAreaRenderer
plot.getRenderer().setSeriesPaint(seriesIndex, new GradientPaint(0.0f, 0.0f, new Color(255, 0, 0), 0.0f, 0.0f, new Color(0, 255, 255)));
于 2016-12-08T12:45:37.840 回答
0
只需共享工作代码 - 修复其他公开可用代码中的错误。
package gui;
/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2005, 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.]
*
* ---------------------
* MyXYAreaRenderer.java
* ---------------------
* (C) Copyright 2005, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* $Id: XYAreaRenderer.java,v 1.12.2.5 2005/12/22 15:53:05 mungady Exp $
*
* Changes:
* --------
* 22-Dec-2005 : Version 1 (DG);
*
*
*/
import model.Globals;
import org.jfree.chart.axis.ValueAxis;
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.renderer.xy.XYAreaRenderer;
import org.jfree.chart.renderer.xy.XYItemRendererState;
import org.jfree.chart.ui.GradientPaintTransformer;
import org.jfree.chart.ui.StandardGradientPaintTransformer;
import org.jfree.chart.urls.XYURLGenerator;
import org.jfree.data.xy.XYDataset;
import org.jfree.util.ShapeUtilities;
import java.awt.*;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
/**
* Custom renderer.
*/
public class GraphAreaRenderer extends XYAreaRenderer {
/**
* A state object used by this renderer.
*/
static class XYAreaRendererState extends XYItemRendererState {
/**
* Working storage for the area under one series.
*/
public Polygon area;
/**
* Working line that can be recycled.
*/
public Line2D line;
/**
* Creates a new state.
*
* @param info the plot rendering info.
*/
public XYAreaRendererState(PlotRenderingInfo info) {
super(info);
this.area = null; //new Polygon();
this.line = new Line2D.Double();
}
}
/**
* Constructs a new renderer.
*/
public GraphAreaRenderer() {
this(AREA);
}
/**
* Constructs a new renderer.
*
* @param type the type of the renderer.
*/
public GraphAreaRenderer(int type) {
this(type, null, null);
}
/**
* Constructs a new renderer.
* <p>
* To specify the type of renderer, use one of the constants: SHAPES, LINES,
* SHAPES_AND_LINES, AREA 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 GraphAreaRenderer(int type, XYToolTipGenerator toolTipGenerator,
XYURLGenerator urlGenerator) {
super(type, toolTipGenerator, urlGenerator);
}
/**
* Initialises the renderer and returns a state object that should be
* passed to all subsequent calls to the drawItem() method.
*
* @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 A state object for use by the renderer.
*/
public XYItemRendererState initialise(Graphics2D g2, Rectangle2D dataArea,
XYPlot plot, XYDataset data, PlotRenderingInfo info) {
XYAreaRendererState state = new XYAreaRendererState(info);
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) {
Globals.LogManager().logDbg(String.format("Item %d ", item));
if (!getItemVisible(series, item))
return;
assert (plot.getOrientation() == PlotOrientation.VERTICAL);
XYAreaRendererState areaState = (XYAreaRendererState) state;
// get the data point...
double x1 = dataset.getXValue(series, item);
double y1 = dataset.getYValue(series, item);
if (Double.isNaN(y1))
y1 = 0.0;
double transX1 = domainAxis.valueToJava2D(x1, dataArea,
plot.getDomainAxisEdge());
double transY1 = rangeAxis.valueToJava2D(y1, dataArea,
plot.getRangeAxisEdge());
// get the previous point and the next point so we can calculate a
// "hot spot" for the area (used by the chart entity)...
int itemCount = dataset.getItemCount(series);
double x0 = dataset.getXValue(series, Math.max(item - 1, 0));
double y0 = dataset.getYValue(series, Math.max(item - 1, 0));
if (Double.isNaN(y0))
y0 = 0.0;
double transX0 = domainAxis.valueToJava2D(x0, dataArea,
plot.getDomainAxisEdge());
double transY0 = rangeAxis.valueToJava2D(y0, dataArea,
plot.getRangeAxisEdge());
double x2 = dataset.getXValue(series, Math.min(item + 1,
itemCount - 1));
double y2 = dataset.getYValue(series, Math.min(item + 1,
itemCount - 1));
if (Double.isNaN(y2))
y2 = 0.0;
/*
double transX2 = domainAxis.valueToJava2D(x2, dataArea,
plot.getDomainAxisEdge());
double transY2 = rangeAxis.valueToJava2D(y2, dataArea,
plot.getRangeAxisEdge());
*/
double transZero = rangeAxis.valueToJava2D(0.0, dataArea,
plot.getRangeAxisEdge());
/*
Polygon hotspot = null;
hotspot = new Polygon();
hotspot.addPoint((int) ((transX0 + transX1) / 2.0),
(int) transZero);
hotspot.addPoint((int) ((transX0 + transX1) / 2.0),
(int) ((transY0 + transY1) / 2.0));
hotspot.addPoint((int) transX1, (int) transY1);
hotspot.addPoint((int) ((transX1 + transX2) / 2.0),
(int) ((transY1 + transY2) / 2.0));
hotspot.addPoint((int) ((transX1 + transX2) / 2.0),
(int) transZero);
*/
if (state.getFirstItemIndex() == item) { // create a new area polygon for the series
areaState.area = new Polygon();
// the first point is (x, 0)
double zero = rangeAxis.valueToJava2D(0.0, dataArea,
plot.getRangeAxisEdge());
areaState.area.addPoint((int) transX1, (int) zero);
Globals.LogManager().logDbg(String.format("addPoint1 %d %d", (int) transX1, (int) zero));
}
// Add each point to Area (x, y)
areaState.area.addPoint((int) transX1, (int) transY1);
Globals.LogManager().logDbg(String.format("addPoint2 %d %d", (int) transX1, (int) transY1));
PlotOrientation orientation = plot.getOrientation();
Paint paint = getItemPaint(series, item);
Stroke stroke = getItemStroke(series, item);
g2.setPaint(paint);
g2.setStroke(stroke);
Shape shape = null;
if (getPlotShapes()) {
shape = getItemShape(series, item);
shape = ShapeUtilities.createTranslatedShape(shape, transX1, transY1);
g2.draw(shape);
}
if (getPlotLines()) {
if (item > 0) {
areaState.line.setLine(transX0, transY0, transX1, transY1);
g2.draw(areaState.line);
}
}
// Check if the item is the last item for the series.
// and number of items > 0. We can't draw an area for a single point.
if (getPlotArea() && item > 0 && state.getLastItemIndex() == item) {
areaState.area.addPoint((int) transX1, (int) transZero);
Globals.LogManager().logDbg(String.format("addPoint3 %d %d", (int) transX1, (int) transZero));
Paint fillPaint = getItemFillPaint(series, item);
if (fillPaint instanceof GradientPaint) {
GradientPaint gp = (GradientPaint) fillPaint;
GradientPaintTransformer t = new StandardGradientPaintTransformer();
fillPaint = t.transform(gp, areaState.area.getBounds());
}
g2.setPaint(fillPaint);
g2.fill(areaState.area);
for(int i=0;i<areaState.area.npoints;i++)
Globals.LogManager().logDbg(String.format("Polygon: %d %d ", areaState.area.xpoints[i], areaState.area.ypoints[i]));
// draw an outline around the Area.
if (isOutline()) {
g2.setStroke(getItemOutlineStroke(series, item));
g2.setPaint(getItemOutlinePaint(series, item));
g2.draw(areaState.area);
}
}
//updateCrosshairValues( crosshairState, x1, y1, transX1, transY1, orientation );
// collect entity and tool tip information...
/* if (state.getInfo() != null) {
EntityCollection entities = state.getEntityCollection();
if (entities != null && hotspot != null) {
String tip = null;
XYToolTipGenerator generator
= getToolTipGenerator(series, item);
if (generator != null) {
tip = generator.generateToolTip(dataset, series, item);
}
String url = null;
if (getURLGenerator() != null) {
url = getURLGenerator().generateURL(dataset, series, item);
}
XYItemEntity entity = new XYItemEntity(hotspot, dataset,
series, item, tip, url);
entities.add(entity);
}
}
*/
}
}
于 2019-10-24T21:26:35.017 回答