JFreeChart所使用的色系生成的图表很难看，笔者深有体会。在使用到JfreeChart的一些项目中经常会有客户提出"能不能由我们自己去设置图表中每个分类的颜色"等等诸如此类的需求。但用户往往不具备美工的实力，设置的颜色也往往差强人意。为此，何不将问题解决在最初发生的阶段，由我们来指定JFreeChart的色系。 在仔细研究JFreeChart的源码后发现，想更改JfreeChart的色系其实不难。下面就来具体谈一谈如何让JFreeChart绘制我们指定的色系。
JFreeChart的默认色系
自定义色系
使用自定义色系可以采用以下2种方式：
一、直接修改ChartColor.class文件
ChartColor的源码：
/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2008, 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.]
*
* ---------------
* ChartColor.java
* ---------------
* (C) Copyright 2003-2008, by Cameron Riley and Contributors.
*
* Original Author: Cameron Riley;
* Contributor(s): David Gilbert (for Object Refinery Limited);
*
* Changes
* -------
* 23-Jan-2003 : Version 1, contributed by Cameron Riley (DG);
* 25-Nov-2004 : Changed first 7 colors to softer shades (DG);
* 03-Nov-2005 : Removed orange color, too close to yellow - see bug
* report 1328408 (DG);
* ------------- JFREECHART 1.0.x ---------------------------------------------
* 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
*
*/
package org.jfree.chart;
import java.awt.Color;
import java.awt.Paint;
/**
* Class to extend the number of Colors available to the charts. This
* extends the java.awt.Color object and extends the number of final
* Colors publically accessible.
*/
public class ChartColor extends Color {
/** A very dark red color. */
public static final Color VERY_DARK_RED = new Color(0x80, 0x00, 0x00);
/** A dark red color. */
public static final Color DARK_RED = new Color(0xc0, 0x00, 0x00);
/** A light red color. */
public static final Color LIGHT_RED = new Color(0xFF, 0x40, 0x40);
/** A very light red color. */
public static final Color VERY_LIGHT_RED = new Color(0xFF, 0x80, 0x80);
/** A very dark yellow color. */
public static final Color VERY_DARK_YELLOW = new Color(0x80, 0x80, 0x00);
/** A dark yellow color. */
public static final Color DARK_YELLOW = new Color(0xC0, 0xC0, 0x00);
/** A light yellow color. */
public static final Color LIGHT_YELLOW = new Color(0xFF, 0xFF, 0x40);
/** A very light yellow color. */
public static final Color VERY_LIGHT_YELLOW = new Color(0xFF, 0xFF, 0x80);
/** A very dark green color. */
public static final Color VERY_DARK_GREEN = new Color(0x00, 0x80, 0x00);
/** A dark green color. */
public static final Color DARK_GREEN = new Color(0x00, 0xC0, 0x00);
/** A light green color. */
public static final Color LIGHT_GREEN = new Color(0x40, 0xFF, 0x40);
/** A very light green color. */
public static final Color VERY_LIGHT_GREEN = new Color(0x80, 0xFF, 0x80);
/** A very dark cyan color. */
public static final Color VERY_DARK_CYAN = new Color(0x00, 0x80, 0x80);
/** A dark cyan color. */
public static final Color DARK_CYAN = new Color(0x00, 0xC0, 0xC0);
/** A light cyan color. */
public static final Color LIGHT_CYAN = new Color(0x40, 0xFF, 0xFF);
/** Aa very light cyan color. */
public static final Color VERY_LIGHT_CYAN = new Color(0x80, 0xFF, 0xFF);
/** A very dark blue color. */
public static final Color VERY_DARK_BLUE = new Color(0x00, 0x00, 0x80);
/** A dark blue color. */
public static final Color DARK_BLUE = new Color(0x00, 0x00, 0xC0);
/** A light blue color. */
public static final Color LIGHT_BLUE = new Color(0x40, 0x40, 0xFF);
/** A very light blue color. */
public static final Color VERY_LIGHT_BLUE = new Color(0x80, 0x80, 0xFF);
/** A very dark magenta/purple color. */
public static final Color VERY_DARK_MAGENTA = new Color(0x80, 0x00, 0x80);
/** A dark magenta color. */
public static final Color DARK_MAGENTA = new Color(0xC0, 0x00, 0xC0);
/** A light magenta color. */
public static final Color LIGHT_MAGENTA = new Color(0xFF, 0x40, 0xFF);
/** A very light magenta color. */
public static final Color VERY_LIGHT_MAGENTA = new Color(0xFF, 0x80, 0xFF);
/**
* Creates a Color with an opaque sRGB with red, green and blue values in
* range 0-255.
*
* @param r the red component in range 0x00-0xFF.
* @param g the green component in range 0x00-0xFF.
* @param b the blue component in range 0x00-0xFF.
*/
public ChartColor2(int r, int g, int b) {
super(r, g, b);
}
/**
* Convenience method to return an array of <code>Paint</code> objects that
* represent the pre-defined colors in the <code>Color<code> and
* <code>ChartColor</code> objects.
*
* @return An array of objects with the <code>Paint</code> interface.
*/
public static Paint[] createDefaultPaintArray() {
return new Paint[] {
new Color(0xFF, 0x55, 0x55),
new Color(0x55, 0x55, 0xFF),
new Color(0x55, 0xFF, 0x55),
new Color(0xFF, 0xFF, 0x55),
new Color(0xFF, 0x55, 0xFF),
new Color(0x55, 0xFF, 0xFF),
Color.pink,
Color.gray,
ChartColor.DARK_RED,
ChartColor.DARK_BLUE,
ChartColor.DARK_GREEN,
ChartColor.DARK_YELLOW,
ChartColor.DARK_MAGENTA,
ChartColor.DARK_CYAN,
Color.darkGray,
ChartColor.LIGHT_RED,
ChartColor.LIGHT_BLUE,
ChartColor.LIGHT_GREEN,
ChartColor.LIGHT_YELLOW,
ChartColor.LIGHT_MAGENTA,
ChartColor.LIGHT_CYAN,
Color.lightGray,
ChartColor.VERY_DARK_RED,
ChartColor.VERY_DARK_BLUE,
ChartColor.VERY_DARK_GREEN,
ChartColor.VERY_DARK_YELLOW,
ChartColor.VERY_DARK_MAGENTA,
ChartColor.VERY_DARK_CYAN,
ChartColor.VERY_LIGHT_RED,
ChartColor.VERY_LIGHT_BLUE,
ChartColor.VERY_LIGHT_GREEN,
ChartColor.VERY_LIGHT_YELLOW,
ChartColor.VERY_LIGHT_MAGENTA,
ChartColor.VERY_LIGHT_CYAN
};
}
}
JFreeChart在该类中定义了色系中使用颜色的常量，并且在createDefaultPaintArray方法中返回整个色系的数组。我们可以将其替换成自己定义好的色系，如下代码所示（笔者借鉴了FusionChart的色系）：
package org.jfree.chart;
import java.awt.Color;
import java.awt.Paint;
/**
* @author xum
* 自定义色系
*/
public class ChartColor extends Color{
public static final Color COLOR1 = new Color(188,228,255);
public static final Color COLOR2 = new Color(255,205,35);
public static final Color COLOR3 = new Color(157,202,20);
public static final Color COLOR4 = new Color(209,126,73);
public static final Color COLOR5 = new Color(35,167,167);
public static final Color COLOR6 = new Color(237,98,98);
public static final Color COLOR7 = new Color(167,98,167);
public static final Color COLOR8 = new Color(102,147,53);
public static final Color COLOR9 = new Color(209,202,40);
public static final Color COLOR10 = new Color(20,159,230);
public static final Color COLOR11 = new Color(180,43,48);
public static final Color COLOR12 = new Color(183,159,210);
public static final Color COLOR13 = new Color(227,128,30);
public static final Color COLOR14 = new Color(255,208,147);
public static final Color COLOR15 = new Color(198,188,35);
public static final Color COLOR16 = new Color(255,139,154);
public static final Color COLOR17 = new Color(209,198,9);
public static final Color COLOR18 = new Color(20,103,183);
public static final Color COLOR19 = new Color(255,169,52);
public static final Color COLOR20 = new Color(227,79,30);
public static final Color COLOR21= new Color(30,128,30);
public static final Color COLOR22 = new Color(132,83,35);
public ChartColor(int r, int g, int b) {
super(r, g, b);
// TODO Auto-generated constructor stub
}
public static Paint[] createDefaultPaintArray() {
return new Paint[] {
ChartColor.COLOR1,
ChartColor.COLOR2,
ChartColor.COLOR3,
ChartColor.COLOR4,
ChartColor.COLOR5,
ChartColor.COLOR6,
ChartColor.COLOR7,
ChartColor.COLOR8,
ChartColor.COLOR9,
ChartColor.COLOR10,
ChartColor.COLOR11,
ChartColor.COLOR12,
ChartColor.COLOR13,
ChartColor.COLOR14,
ChartColor.COLOR15,
ChartColor.COLOR16,
ChartColor.COLOR17,
ChartColor.COLOR18,
ChartColor.COLOR19,
ChartColor.COLOR20,
ChartColor.COLOR21,
ChartColor.COLOR22,
};
}
}
编译后替换进JfreeChart的Jar包即可。
二、在JFreeChart的基础上进行扩展
如果担心存在开源协议问题的话，可以考虑这种方式。
新建一个色系类（同上，在此不做赘述）。
自定义一个DefaultDrawingSupplier类，该类位于org.jfree.chart.plot包中
代码如下：
/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2008, 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.]
*
* ---------------------------
* DefaultDrawingSupplier.java
* ---------------------------
* (C) Copyright 2003-2008, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): Jeremy Bowman;
*
* Changes
* -------
* 16-Jan-2003 : Version 1 (DG);
* 17-Jan-2003 : Added stroke method, renamed DefaultPaintSupplier
* --> DefaultDrawingSupplier (DG)
* 27-Jan-2003 : Incorporated code from SeriesShapeFactory, originally
* contributed by Jeremy Bowman (DG);
* 25-Mar-2003 : Implemented Serializable (DG);
* 20-Aug-2003 : Implemented Cloneable and PublicCloneable (DG);
* ------------- JFREECHART 1.0.x ---------------------------------------------
* 13-Jun-2007 : Added fillPaintSequence (DG);
*
*/
package org.jfree.chart.plot;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Paint;
import java.awt.Polygon;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Arrays;
import org.jfree.chart.ChartColor;
import org.jfree.io.SerialUtilities;
import org.jfree.util.PublicCloneable;
import org.jfree.util.ShapeUtilities;
/**
* A default implementation of the {@link DrawingSupplier} interface. All
* {@link Plot} instances have a new instance of this class installed by
* default.
*/
public class DefaultDrawingSupplier implements DrawingSupplier, Cloneable,
PublicCloneable, Serializable {
/** For serialization. */
private static final long serialVersionUID = -7339847061039422538L;
/** The default fill paint sequence. */
public static final Paint[] DEFAULT_PAINT_SEQUENCE
= ChartColor.createDefaultPaintArray();
/** The default outline paint sequence. */
public static final Paint[] DEFAULT_OUTLINE_PAINT_SEQUENCE = new Paint[] {
Color.lightGray};
/** The default fill paint sequence. */
public static final Paint[] DEFAULT_FILL_PAINT_SEQUENCE = new Paint[] {
Color.white};
/** The default stroke sequence. */
public static final Stroke[] DEFAULT_STROKE_SEQUENCE = new Stroke[] {
new BasicStroke(1.0f, BasicStroke.CAP_SQUARE,
BasicStroke.JOIN_BEVEL)};
/** The default outline stroke sequence. */
public static final Stroke[] DEFAULT_OUTLINE_STROKE_SEQUENCE
= new Stroke[] {new BasicStroke(1.0f, BasicStroke.CAP_SQUARE,
BasicStroke.JOIN_BEVEL)};
/** The default shape sequence. */
public static final Shape[] DEFAULT_SHAPE_SEQUENCE
= createStandardSeriesShapes();
/** The paint sequence. */
private transient Paint[] paintSequence;
/** The current paint index. */
private int paintIndex;
/** The outline paint sequence. */
private transient Paint[] outlinePaintSequence;
/** The current outline paint index. */
private int outlinePaintIndex;
/** The fill paint sequence. */
private transient Paint[] fillPaintSequence;
/** The current fill paint index. */
private int fillPaintIndex;
/** The stroke sequence. */
private transient Stroke[] strokeSequence;
/** The current stroke index. */
private int strokeIndex;
/** The outline stroke sequence. */
private transient Stroke[] outlineStrokeSequence;
/** The current outline stroke index. */
private int outlineStrokeIndex;
/** The shape sequence. */
private transient Shape[] shapeSequence;
/** The current shape index. */
private int shapeIndex;
/**
* Creates a new supplier, with default sequences for fill paint, outline
* paint, stroke and shapes.
*/
public DefaultDrawingSupplier() {
this(DEFAULT_PAINT_SEQUENCE, DEFAULT_FILL_PAINT_SEQUENCE,
DEFAULT_OUTLINE_PAINT_SEQUENCE,
DEFAULT_STROKE_SEQUENCE,
DEFAULT_OUTLINE_STROKE_SEQUENCE,
DEFAULT_SHAPE_SEQUENCE);
}
/**
* Creates a new supplier.
*
* @param paintSequence the fill paint sequence.
* @param outlinePaintSequence the outline paint sequence.
* @param strokeSequence the stroke sequence.
* @param outlineStrokeSequence the outline stroke sequence.
* @param shapeSequence the shape sequence.
*/
public DefaultDrawingSupplier(Paint[] paintSequence,
Paint[] outlinePaintSequence,
Stroke[] strokeSequence,
Stroke[] outlineStrokeSequence,
Shape[] shapeSequence) {
this.paintSequence = paintSequence;
this.fillPaintSequence = DEFAULT_FILL_PAINT_SEQUENCE;
this.outlinePaintSequence = outlinePaintSequence;
this.strokeSequence = strokeSequence;
this.outlineStrokeSequence = outlineStrokeSequence;
this.shapeSequence = shapeSequence;
}
/**
* Creates a new supplier.
*
* @param paintSequence the paint sequence.
* @param fillPaintSequence the fill paint sequence.
* @param outlinePaintSequence the outline paint sequence.
* @param strokeSequence the stroke sequence.
* @param outlineStrokeSequence the outline stroke sequence.
* @param shapeSequence the shape sequence.
*
* @since 1.0.6
*/
public DefaultDrawingSupplier(Paint[] paintSequence,
Paint[] fillPaintSequence, Paint[] outlinePaintSequence,
Stroke[] strokeSequence, Stroke[] outlineStrokeSequence,
Shape[] shapeSequence) {
this.paintSequence = paintSequence;
this.fillPaintSequence = fillPaintSequence;
this.outlinePaintSequence = outlinePaintSequence;
this.strokeSequence = strokeSequence;
this.outlineStrokeSequence = outlineStrokeSequence;
this.shapeSequence = shapeSequence;
}
/**
* Returns the next paint in the sequence.
*
* @return The paint.
*/
public Paint getNextPaint() {
Paint result
= this.paintSequence[this.paintIndex % this.paintSequence.length];
this.paintIndex++;
return result;
}
/**
* Returns the next outline paint in the sequence.
*
* @return The paint.
*/
public Paint getNextOutlinePaint() {
Paint result = this.outlinePaintSequence[
this.outlinePaintIndex % this.outlinePaintSequence.length];
this.outlinePaintIndex++;
return result;
}
/**
* Returns the next fill paint in the sequence.
*
* @return The paint.
*
* @since 1.0.6
*/
public Paint getNextFillPaint() {
Paint result = this.fillPaintSequence[this.fillPaintIndex
% this.fillPaintSequence.length];
this.fillPaintIndex++;
return result;
}
/**
* Returns the next stroke in the sequence.
*
* @return The stroke.
*/
public Stroke getNextStroke() {
Stroke result = this.strokeSequence[
this.strokeIndex % this.strokeSequence.length];
this.strokeIndex++;
return result;
}
/**
* Returns the next outline stroke in the sequence.
*
* @return The stroke.
*/
public Stroke getNextOutlineStroke() {
Stroke result = this.outlineStrokeSequence[
this.outlineStrokeIndex % this.outlineStrokeSequence.length];
this.outlineStrokeIndex++;
return result;
}
/**
* Returns the next shape in the sequence.
*
* @return The shape.
*/
public Shape getNextShape() {
Shape result = this.shapeSequence[
this.shapeIndex % this.shapeSequence.length];
this.shapeIndex++;
return result;
}
/**
* Creates an array of standard shapes to display for the items in series
* on charts.
*
* @return The array of shapes.
*/
public static Shape[] createStandardSeriesShapes() {
Shape[] result = new Shape[10];
double size = 6.0;
double delta = size / 2.0;
int[] xpoints = null;
int[] ypoints = null;
// square
result[0] = new Rectangle2D.Double(-delta, -delta, size, size);
// circle
result[1] = new Ellipse2D.Double(-delta, -delta, size, size);
// up-pointing triangle
xpoints = intArray(0.0, delta, -delta);
ypoints = intArray(-delta, delta, delta);
result[2] = new Polygon(xpoints, ypoints, 3);
// diamond
xpoints = intArray(0.0, delta, 0.0, -delta);
ypoints = intArray(-delta, 0.0, delta, 0.0);
result[3] = new Polygon(xpoints, ypoints, 4);
// horizontal rectangle
result[4] = new Rectangle2D.Double(-delta, -delta / 2, size, size / 2);
// down-pointing triangle
xpoints = intArray(-delta, +delta, 0.0);
ypoints = intArray(-delta, -delta, delta);
result[5] = new Polygon(xpoints, ypoints, 3);
// horizontal ellipse
result[6] = new Ellipse2D.Double(-delta, -delta / 2, size, size / 2);
// right-pointing triangle
xpoints = intArray(-delta, delta, -delta);
ypoints = intArray(-delta, 0.0, delta);
result[7] = new Polygon(xpoints, ypoints, 3);
// vertical rectangle
result[8] = new Rectangle2D.Double(-delta / 2, -delta, size / 2, size);
// left-pointing triangle
xpoints = intArray(-delta, delta, delta);
ypoints = intArray(0.0, -delta, +delta);
result[9] = new Polygon(xpoints, ypoints, 3);
return result;
}
/**
* Tests this object for equality with another 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 DefaultDrawingSupplier)) {
return false;
}
DefaultDrawingSupplier that = (DefaultDrawingSupplier) obj;
if (!Arrays.equals(this.paintSequence, that.paintSequence)) {
return false;
}
if (this.paintIndex != that.paintIndex) {
return false;
}
if (!Arrays.equals(this.outlinePaintSequence,
that.outlinePaintSequence)) {
return false;
}
if (this.outlinePaintIndex != that.outlinePaintIndex) {
return false;
}
if (!Arrays.equals(this.strokeSequence, that.strokeSequence)) {
return false;
}
if (this.strokeIndex != that.strokeIndex) {
return false;
}
if (!Arrays.equals(this.outlineStrokeSequence,
that.outlineStrokeSequence)) {
return false;
}
if (this.outlineStrokeIndex != that.outlineStrokeIndex) {
return false;
}
if (!equalShapes(this.shapeSequence, that.shapeSequence)) {
return false;
}
if (this.shapeIndex != that.shapeIndex) {
return false;
}
return true;
}
/**
* A utility method for testing the equality of two arrays of shapes.
*
* @param s1 the first array (<code>null</code> permitted).
* @param s2 the second array (<code>null</code> permitted).
*
* @return A boolean.
*/
private boolean equalShapes(Shape[] s1, Shape[] s2) {
if (s1 == null) {
return s2 == null;
}
if (s2 == null) {
return false;
}
if (s1.length != s2.length) {
return false;
}
for (int i = 0; i < s1.length; i++) {
if (!ShapeUtilities.equal(s1[i], s2[i])) {
return false;
}
}
return true;
}
/**
* Handles serialization.
*
* @param stream the output stream.
*
* @throws IOException if there is an I/O problem.
*/
private void writeObject(ObjectOutputStream stream) throws IOException {
stream.defaultWriteObject();
int paintCount = this.paintSequence.length;
stream.writeInt(paintCount);
for (int i = 0; i < paintCount; i++) {
SerialUtilities.writePaint(this.paintSequence[i], stream);
}
int outlinePaintCount = this.outlinePaintSequence.length;
stream.writeInt(outlinePaintCount);
for (int i = 0; i < outlinePaintCount; i++) {
SerialUtilities.writePaint(this.outlinePaintSequence[i], stream);
}
int strokeCount = this.strokeSequence.length;
stream.writeInt(strokeCount);
for (int i = 0; i < strokeCount; i++) {
SerialUtilities.writeStroke(this.strokeSequence[i], stream);
}
int outlineStrokeCount = this.outlineStrokeSequence.length;
stream.writeInt(outlineStrokeCount);
for (int i = 0; i < outlineStrokeCount; i++) {
SerialUtilities.writeStroke(this.outlineStrokeSequence[i], stream);
}
int shapeCount = this.shapeSequence.length;
stream.writeInt(shapeCount);
for (int i = 0; i < shapeCount; i++) {
SerialUtilities.writeShape(this.shapeSequence[i], stream);
}
}
/**
* Restores a serialized object.
*
* @param stream the input stream.
*
* @throws IOException if there is an I/O problem.
* @throws ClassNotFoundException if there is a problem loading a class.
*/
private void readObject(ObjectInputStream stream)
throws IOException, ClassNotFoundException {
stream.defaultReadObject();
int paintCount = stream.readInt();
this.paintSequence = new Paint[paintCount];
for (int i = 0; i < paintCount; i++) {
this.paintSequence[i] = SerialUtilities.readPaint(stream);
}
int outlinePaintCount = stream.readInt();
this.outlinePaintSequence = new Paint[outlinePaintCount];
for (int i = 0; i < outlinePaintCount; i++) {
this.outlinePaintSequence[i] = SerialUtilities.readPaint(stream);
}
int strokeCount = stream.readInt();
this.strokeSequence = new Stroke[strokeCount];
for (int i = 0; i < strokeCount; i++) {
this.strokeSequence[i] = SerialUtilities.readStroke(stream);
}
int outlineStrokeCount = stream.readInt();
this.outlineStrokeSequence = new Stroke[outlineStrokeCount];
for (int i = 0; i < outlineStrokeCount; i++) {
this.outlineStrokeSequence[i] = SerialUtilities.readStroke(stream);
}
int shapeCount = stream.readInt();
this.shapeSequence = new Shape[shapeCount];
for (int i = 0; i < shapeCount; i++) {
this.shapeSequence[i] = SerialUtilities.readShape(stream);
}
}
/**
* Helper method to avoid lots of explicit casts in getShape(). Returns
* an array containing the provided doubles cast to ints.
*
* @param a x
* @param b y
* @param c z
*
* @return int[3] with converted params.
*/
private static int[] intArray(double a, double b, double c) {
return new int[] {(int) a, (int) b, (int) c};
}
/**
* Helper method to avoid lots of explicit casts in getShape(). Returns
* an array containing the provided doubles cast to ints.
*
* @param a x
* @param b y
* @param c z
* @param d t
*
* @return int[4] with converted params.
*/
private static int[] intArray(double a, double b, double c, double d) {
return new int[] {(int) a, (int) b, (int) c, (int) d};
}
/**
* Returns a clone.
*
* @return A clone.
*
* @throws CloneNotSupportedException if a component of the supplier does
* not support cloning.
*/
public Object clone() throws CloneNotSupportedException {
DefaultDrawingSupplier clone = (DefaultDrawingSupplier) super.clone();
return clone;
}
}
只需要如下代码中的"ChartColor" 替换成自定义色系类即可。
public static final Paint[] DEFAULT_PAINT_SEQUENCE
= ChartColor.createDefaultPaintArray();
然后在生成JFreeChart实例中设置DrawingSupplier属性即可，代码片段如下：
JFreeChart jfreechart = createChart(categorydataset);
jfreechart.getPlot().setDrawingSupplier(new CustomDrawingSupplier());
这篇是从我以前CSDN博客上转来的，系本人原创，转载请注明出处。