root / trunk / extensions / extRasterTools-SE / src / org / gvsig / raster / beans / canvas / layers / GraphicHistogram.java @ 21135
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/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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*
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* Copyright (C) 2007 IVER T.I. and Generalitat Valenciana.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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*/
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package org.gvsig.raster.beans.canvas.layers; |
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import java.awt.Color; |
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import java.awt.Graphics; |
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import org.gvsig.raster.beans.canvas.DrawableElement; |
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/**
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* Gr?fica que representa un histograma con los valores pasados en el constructor
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*
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* 14-oct-2007
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* @author Nacho Brodin (nachobrodin@gmail.com)
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*/
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public class GraphicHistogram extends DrawableElement { |
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public static final int TYPE_LINE = 1; |
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public static final int TYPE_FILL = 2; |
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public static final int VIEW_LINEAL = 0; |
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public static final int VIEW_ACUMMULATED = 1; |
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public static final int VIEW_LOGARITHMIC = 2; |
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public static final int VIEW_ACUMMULATEDLOG = 3; |
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public static final int FUNCTION_LINEAL = 0; |
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public static final int FUNCTION_GAUSS = 1; |
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public static final int FUNCTION_EXPONENT = 2; |
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public static final int FUNCTION_LOGARIT = 3; |
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public static final int FUNCTION_SQUARE_ROOT = 4; |
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public static final int EQUALIZATION = 5; |
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public static final int FUNCTION_DENSITY = 6; |
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private int border = 2; |
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// Valores de la funci?n original
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private double[] histogramValues = null; |
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// Valores que se pintan en la gr?fica
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private double[] valuesLineal = null; |
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private double[] valuesAcummulated = null; |
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private double[] valuesLogarithmic = null; |
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private double[] valuesAcummulatedLog = null; |
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private int typeViewed = 0; |
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private int type = TYPE_LINE; |
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/**
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* Constructor. Asigna el color
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* @param c
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*/
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public GraphicHistogram(Color c) { |
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setColor(c); |
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} |
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/**
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* Constructor. Asigna el color y los valores
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* @param c
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*/
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public GraphicHistogram(double[] values, Color c) { |
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setColor(c); |
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setHistogramDrawed(values); |
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} |
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private int valueToPixelY(double value) { |
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value = 1.0D - value;
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return (int) Math.round(canvas.getCanvasMinY() + border + ((canvas.getCanvasMaxY() - canvas.getCanvasMinY() - (border * 2)) * value)); |
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} |
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/**
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* Dibujado de la l?nea de incremento exponencial sobre el canvas.
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*/
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protected void paint(Graphics g) { |
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double[] valuesToDraw = recalcHistogram(typeViewed); |
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if (valuesToDraw == null) |
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return;
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g.setColor(color); |
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double width;
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switch (type) {
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case TYPE_FILL:
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width = canvas.getCanvasMaxX() - canvas.getCanvasMinX(); |
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for (int i = 0; i < valuesToDraw.length; i++) { |
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int x1 = (int) Math.round(((double) i - 0.5D) * (width / (valuesToDraw.length - 1.0D))); |
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int x2 = (int) Math.round(((double) i + 0.5D) * (width / (valuesToDraw.length - 1.0D))); |
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x1 += canvas.getCanvasMinX(); |
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x2 += canvas.getCanvasMinX(); |
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int y1 = valueToPixelY(valuesToDraw[i]);
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if (x1 < (canvas.getCanvasMinX() + border))
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x1 = canvas.getCanvasMinX() + border; |
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if (x2 > (canvas.getCanvasMaxX() - border))
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x2 = canvas.getCanvasMaxX() - border; |
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g.setColor(color); |
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g.fillRect(x1, y1, x2 - x1, canvas.getCanvasMaxY() - border - y1); |
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} |
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break;
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default:
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width = canvas.getCanvasMaxX() - canvas.getCanvasMinX(); |
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for (int i = 1; i < valuesToDraw.length; i++) { |
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int x1 = (int) Math.round(canvas.getCanvasMinX() + ((i - 1.0D) * (width / (valuesToDraw.length - 1.0D)))); |
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int x2 = (int) Math.round(canvas.getCanvasMinX() + (i * (width / (valuesToDraw.length - 1.0D)))); |
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g.drawLine(x1, valueToPixelY(valuesToDraw[i - 1]), x2, valueToPixelY(valuesToDraw[i]));
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} |
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break;
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} |
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} |
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/**
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* Asigna el tipo de gr?fica a mostrar. El tipo de gr?fica est? definida por las constantes TYPE
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* definidas en esta clase. Por defecto siempre se muestra el tipo LINE
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* @param type
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*/
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public void setType(int type) { |
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this.type = type;
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} |
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/**
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* Asigna el tipo de vista para el histograma a mostrar. No hace un repintado
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* @param type
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*/
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public void setTypeViewed(int type) { |
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this.typeViewed = type;
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} |
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/**
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* Convertimos los valores del histograma a visualizar a una escala de
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* porcentajes que es lo que representa visualmente el componente
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* @param values
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*/
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private void convertToPercent(double[] values) { |
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double max = Double.NEGATIVE_INFINITY; |
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for (int i = 0; i < values.length; i++) |
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if (values[i] > max)
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max = values[i]; |
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for (int i = 0; i < values.length; i++) |
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values[i] = values[i] / max; |
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} |
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/**
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* Calculamos el histograma a dibujar en cuestion. Los tipos son:<p>
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* VIEW_LINEAL<br>
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* VIEW_ACUMMULATED<br>
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* VIEW_LOGARITHMIC
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*
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* @param type
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* @return
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*/
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private double[] recalcHistogram(int type) { |
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double min;
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if (histogramValues == null) |
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histogramValues = new double[0]; |
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switch (type) {
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// Calcular la grafica acumulada
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case VIEW_ACUMMULATED:
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// Si ya estan calculados, no los vuelve a calcular
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if (valuesAcummulated != null) return valuesAcummulated; |
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valuesAcummulated = new double[histogramValues.length]; |
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if (valuesAcummulated.length >= 1) { |
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valuesAcummulated[0] = histogramValues[0]; |
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for (int i = 1; i < histogramValues.length; i++) |
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valuesAcummulated[i] = histogramValues[i] + valuesAcummulated[i - 1];
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} |
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convertToPercent(valuesAcummulated); |
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return valuesAcummulated;
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// Calcular la grafica logaritmica
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case VIEW_LOGARITHMIC:
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// Si ya estan calculados, no los vuelve a calcular
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if (valuesLogarithmic != null) return valuesLogarithmic; |
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min = Double.MAX_VALUE;
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for (int i = 0; i < histogramValues.length; i++) |
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if (histogramValues[i] < min)
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min = histogramValues[i]; |
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valuesLogarithmic = new double[histogramValues.length]; |
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for (int i = 0; i < histogramValues.length; i++) |
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valuesLogarithmic[i] = java.lang.Math.log(histogramValues[i] - min + 1.0);
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convertToPercent(valuesLogarithmic); |
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return valuesLogarithmic;
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// Calcular la grafica acumulada
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case VIEW_ACUMMULATEDLOG:
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// Si ya estan calculados, no los vuelve a calcular
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if (valuesAcummulatedLog != null) return valuesAcummulatedLog; |
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valuesAcummulatedLog = new double[histogramValues.length]; |
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if (valuesAcummulatedLog.length >= 1) { |
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valuesAcummulatedLog[0] = histogramValues[0]; |
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for (int i = 1; i < histogramValues.length; i++) |
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valuesAcummulatedLog[i] = histogramValues[i] + valuesAcummulatedLog[i - 1];
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} |
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min = Double.MAX_VALUE;
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for (int i = 0; i < valuesAcummulatedLog.length; i++) |
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if (valuesAcummulatedLog[i] < min)
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min = valuesAcummulatedLog[i]; |
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for (int i = 0; i < valuesAcummulatedLog.length; i++) |
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valuesAcummulatedLog[i] = java.lang.Math.log(valuesAcummulatedLog[i] - min + 1.0);
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convertToPercent(valuesAcummulatedLog); |
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return valuesAcummulatedLog;
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// Si no es logaritmica ni acumulada, lo tratamos como si fuera lineal
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default:
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// Si ya estan calculados, no los vuelve a calcular
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if (valuesLineal != null) return valuesLineal; |
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valuesLineal = new double[histogramValues.length]; |
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for (int i = 0; i < histogramValues.length; i++) |
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valuesLineal[i] = histogramValues[i]; |
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convertToPercent(valuesLineal); |
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return valuesLineal;
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} |
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} |
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/**
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* Asigna el histograma a visualizar
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* @param histogramDrawed
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*/
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public void setHistogramDrawed(double[] histogramDrawed) { |
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histogramValues = histogramDrawed; |
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valuesLineal = null;
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valuesAcummulated = null;
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valuesLogarithmic = null;
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valuesAcummulatedLog = null;
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if (canvas != null) |
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canvas.repaint(); |
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} |
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/**
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* Devuelve la forma en la que se dibujara el histograma. Posibilidades:<br>
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* TYPE_LINE<br>
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* TYPE_FILL
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* @return the type
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*/
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public int getType() { |
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return type;
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} |
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/**
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* Devuelve la forma que tendr? la grafica del histograma. Posibilidades:<br>
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* VIEW_LINEAL<br>
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* VIEW_ACUMMULATED<br>
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* VIEW_LOGARITHMIC<br>
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* VIEW_ACUMMULATEDLOG<br>
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*
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* @return the typeViewed
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*/
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public int getTypeViewed() { |
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return typeViewed;
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} |
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/**
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* @return the histogramValues
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*/
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public double[] getHistogramValues() { |
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return histogramValues;
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} |
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public void firstActions() {} |
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public void firstDrawActions() {} |
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} |