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jfreechart example source code file (ColorPalette.java)
The jfreechart ColorPalette.java source code/* =========================================================== * 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.] * * ----------------- * ColorPalette.java * ----------------- * (C) Copyright 2002-2008, by David M. O'Donnell and Contributors. * * Original Author: David M. O'Donnell; * Contributor(s): David Gilbert (for Object Refinery Limited); * * Changes * ------- * 26-Nov-2002 : Version 1 contributed by David M. O'Donnell (DG); * 26-Mar-2003 : Implemented Serializable (DG); * 14-Aug-2003 : Implemented Cloneable (DG); * ------------- JFREECHART 1.0.x --------------------------------------------- * 31-Jan-2007 : Deprecated (DG); * */ package org.jfree.chart.plot; import java.awt.Color; import java.awt.Paint; import java.io.Serializable; import java.util.Arrays; import org.jfree.chart.axis.ValueTick; import org.jfree.chart.renderer.xy.XYBlockRenderer; /** * Defines palette used by {@link ContourPlot}. * * @deprecated This class is no longer supported (as of version 1.0.4). If * you are creating contour plots, please try to use {@link XYPlot} and * {@link XYBlockRenderer}. */ public abstract class ColorPalette implements Cloneable, Serializable { /** For serialization. */ private static final long serialVersionUID = -9029901853079622051L; /** The min z-axis value. */ protected double minZ = -1; /** The max z-axis value. */ protected double maxZ = -1; /** Red components. */ protected int[] r; /** Green components. */ protected int[] g; /** Blue components. */ protected int[] b; /** Tick values are stored for use with stepped palette. */ protected double[] tickValues = null; /** Logscale? */ protected boolean logscale = false; /** Inverse palette (ie, min and max colors are reversed). */ protected boolean inverse = false; /** The palette name. */ protected String paletteName = null; /** Controls whether palette colors are stepped (not continuous). */ protected boolean stepped = false; /** Constant for converting loge to log10. */ protected static final double log10 = Math.log(10); /** * Default contructor. */ public ColorPalette() { super(); } /** * Returns the color associated with a value. * * @param value the value. * * @return The color. */ public Paint getColor(double value) { int izV = (int) (253 * (value - this.minZ) / (this.maxZ - this.minZ)) + 2; return new Color(this.r[izV], this.g[izV], this.b[izV]); } /** * Returns a color. * * @param izV the index into the palette (zero based). * * @return The color. */ public Color getColor(int izV) { return new Color(this.r[izV], this.g[izV], this.b[izV]); } /** * Returns Color by mapping a given value to a linear palette. * * @param value the value. * * @return The color. */ public Color getColorLinear(double value) { int izV = 0; if (this.stepped) { int index = Arrays.binarySearch(this.tickValues, value); if (index < 0) { index = -1 * index - 2; } if (index < 0) { // For the case were the first tick is greater // than minZ value = this.minZ; } else { value = this.tickValues[index]; } } izV = (int) (253 * (value - this.minZ) / (this.maxZ - this.minZ)) + 2; izV = Math.min(izV, 255); izV = Math.max(izV, 2); return getColor(izV); } /** * Returns Color by mapping a given value to a common log palette. * * @param value the value. * * @return The color. */ public Color getColorLog(double value) { int izV = 0; double minZtmp = this.minZ; double maxZtmp = this.maxZ; if (this.minZ <= 0.0) { // negatives = true; this.maxZ = maxZtmp - minZtmp + 1; this.minZ = 1; value = value - minZtmp + 1; } double minZlog = Math.log(this.minZ) / log10; double maxZlog = Math.log(this.maxZ) / log10; value = Math.log(value) / log10; // value = Math.pow(10,value); if (this.stepped) { int numSteps = this.tickValues.length; int steps = 256 / (numSteps - 1); izV = steps * (int) (numSteps * (value - minZlog) / (maxZlog - minZlog)) + 2; // izV = steps*numSteps*(int)((value/minZ)/(maxZlog-minZlog)) + 2; } else { izV = (int) (253 * (value - minZlog) / (maxZlog - minZlog)) + 2; } izV = Math.min(izV, 255); izV = Math.max(izV, 2); this.minZ = minZtmp; this.maxZ = maxZtmp; return getColor(izV); } /** * Returns the maximum Z value. * * @return The value. */ public double getMaxZ() { return this.maxZ; } /** * Returns the minimum Z value. * * @return The value. */ public double getMinZ() { return this.minZ; } /** * Returns Paint by mapping a given value to a either a linear or common * log palette as controlled by the value logscale. * * @param value the value. * * @return The paint. */ public Paint getPaint(double value) { if (isLogscale()) { return getColorLog(value); } else { return getColorLinear(value); } } /** * Returns the palette name. * * @return The palette name. */ public String getPaletteName () { return this.paletteName; } /** * Returns the tick values. * * @return The tick values. */ public double[] getTickValues() { return this.tickValues; } /** * Called to initialize the palette's color indexes */ public abstract void initialize(); /** * Inverts Palette */ public void invertPalette() { int[] red = new int[256]; int[] green = new int[256]; int[] blue = new int[256]; for (int i = 0; i < 256; i++) { red[i] = this.r[i]; green[i] = this.g[i]; blue[i] = this.b[i]; } for (int i = 2; i < 256; i++) { this.r[i] = red[257 - i]; this.g[i] = green[257 - i]; this.b[i] = blue[257 - i]; } } /** * Returns the inverse flag. * * @return The flag. */ public boolean isInverse () { return this.inverse; } /** * Returns the log-scale flag. * * @return The flag. */ public boolean isLogscale() { return this.logscale; } /** * Returns the 'is-stepped' flag. * * @return The flag. */ public boolean isStepped () { return this.stepped; } /** * Sets the inverse flag. * * @param inverse the new value. */ public void setInverse (boolean inverse) { this.inverse = inverse; initialize(); if (inverse) { invertPalette(); } return; } /** * Sets the 'log-scale' flag. * * @param logscale the new value. */ public void setLogscale(boolean logscale) { this.logscale = logscale; } /** * Sets the maximum Z value. * * @param newMaxZ the new value. */ public void setMaxZ(double newMaxZ) { this.maxZ = newMaxZ; } /** * Sets the minimum Z value. * * @param newMinZ the new value. */ public void setMinZ(double newMinZ) { this.minZ = newMinZ; } /** * Sets the palette name. * * @param paletteName the name. */ public void setPaletteName (String paletteName) { //String oldValue = this.paletteName; this.paletteName = paletteName; return; } /** * Sets the stepped flag. * * @param stepped the flag. */ public void setStepped (boolean stepped) { this.stepped = stepped; return; } /** * Sets the tick values. * * @param newTickValues the tick values. */ public void setTickValues(double[] newTickValues) { this.tickValues = newTickValues; } /** * Store ticks. Required when doing stepped axis * * @param ticks the ticks. */ public void setTickValues(java.util.List ticks) { this.tickValues = new double[ticks.size()]; for (int i = 0; i < this.tickValues.length; i++) { this.tickValues[i] = ((ValueTick) ticks.get(i)).getValue(); } } /** * Tests an object for equality with this instance. * * @param o the object to test. * * @return A boolean. */ public boolean equals(Object o) { if (this == o) { return true; } if (!(o instanceof ColorPalette)) { return false; } ColorPalette colorPalette = (ColorPalette) o; if (this.inverse != colorPalette.inverse) { return false; } if (this.logscale != colorPalette.logscale) { return false; } if (this.maxZ != colorPalette.maxZ) { return false; } if (this.minZ != colorPalette.minZ) { return false; } if (this.stepped != colorPalette.stepped) { return false; } if (!Arrays.equals(this.b, colorPalette.b)) { return false; } if (!Arrays.equals(this.g, colorPalette.g)) { return false; } if (this.paletteName != null ? !this.paletteName.equals(colorPalette.paletteName) : colorPalette.paletteName != null) { return false; } if (!Arrays.equals(this.r, colorPalette.r)) { return false; } if (!Arrays.equals(this.tickValues, colorPalette.tickValues)) { return false; } return true; } /** * Returns a hash code. * * @return A hash code. */ public int hashCode() { int result; long temp; temp = Double.doubleToLongBits(this.minZ); result = (int) (temp ^ (temp >>> 32)); temp = Double.doubleToLongBits(this.maxZ); result = 29 * result + (int) (temp ^ (temp >>> 32)); result = 29 * result + (this.logscale ? 1 : 0); result = 29 * result + (this.inverse ? 1 : 0); result = 29 * result + (this.paletteName != null ? this.paletteName.hashCode() : 0); result = 29 * result + (this.stepped ? 1 : 0); return result; } /** * Returns a clone of the palette. * * @return A clone. * * @throws CloneNotSupportedException never. */ public Object clone() throws CloneNotSupportedException { ColorPalette clone = (ColorPalette) super.clone(); return clone; } } Other jfreechart examples (source code examples)Here is a short list of links related to this jfreechart ColorPalette.java source code file: |
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