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EnergyHistogram.java
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EnergyHistogram.java
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// part of Taclet
// author: Ulrike Hager
import javax.swing.*;
import java.awt.*;
import java.util.ArrayList;
public class EnergyHistogram extends JPanel {
private int[] count= new int[200];
private double[] lowBinLimit = new double[200];
private double[] energyArray ;
private double eMin, eMax, binSize;
private int numberOfBins;
/** Set the count and display histogram */
public void showHistogram(double[] energyArray) {
this.energyArray = energyArray;
sortBins();
repaint();
}
private void sortBins(){
eMin=energyArray[0];
eMax=eMin;
if (energyArray.length>1){
for (int i =1 ; i<energyArray.length; i++){
double energy=energyArray[i];
if (energy < eMin) eMin = energy;
if (energy > eMax) eMax = energy;
}
}
binSize = ((eMax-eMin +5)/numberOfBins);
lowBinLimit[0]=eMin-2.5;
for (int i =1; i<200; i++){
lowBinLimit[i]=lowBinLimit[i-1]+binSize;
}
for (int i =1 ; i<energyArray.length; i++){
double energy=energyArray[i];
int j = 0;
while (energy>lowBinLimit[j]){
j++;
}
count[j-1]++;
}
}
/** Paint the histogram */
protected void paintComponent(Graphics g) {
if (count == null) return; // No display if count is null
super.paintComponent(g);
// Find the panel size and bar width and interval dynamically
int width = getWidth();
int height = getHeight();
int interval = (width - 40) / count.length;
int individualWidth = (int)(((width - 40) / 24) * 0.60);
// Find the maximum count. The maximum count has the highest bar
int maxCount = 0;
for (int i = 0; i < count.length; i++) {
if (maxCount < count[i])
maxCount = count[i];
}
// x is the start position for the first bar in the histogram
int x = 30;
// Draw a horizontal base line
g.drawLine(10, height - 45, width - 10, height - 45);
for (int i = 0; i < count.length; i++) {
// Find the bar height
int barHeight =
(int)(((double)count[i] / (double)maxCount) * (height - 55));
// Display a bar (i.e. rectangle)
g.drawRect(x, height - 45 - barHeight, individualWidth,
barHeight);
// Display a letter under the base line
g.drawString((char)(lowBinLimit[x]) + "", x, height - 30);
// Move x for displaying the next character
x += interval;
}
}
/** Override getPreferredSize */
public Dimension getPreferredSize() {
return new Dimension(300, 300);
}
}