carfield.com.hk

misc.dfPackage

2000-06-19T16:00:00Z

Graph.java

2000-06-17T16:00:00Z

import javax.swing.*;
import java.awt.*;
/**
 * Title: Graph
 * Description: Simple program to produce a graph for the book
 * Copyright: Copyright (c) Mark Watson
 * Company: 
 * @author Mark Watson
 * @version 1.0
 */

public class Graph extends JFrame {
 GraphPanel jPanel1;
 float [] data1;
 float [] data2;
 public Graph() {
 try {
 int size = 500;
 data1 = new float[size];
 data2 = new float[size];
 float xmin = -5;
 float xmax = 5;
 for (int i=0; i<size; i++) {
 float x = i;
 x = xmin + x * (xmax - xmin) / (float)size;
 data1[i] = sigmoid(x);
 data2[i] = sigmoidP(x);
 }
 jbInit();
 }
 catch(Exception e) {
 e.printStackTrace();
 }
 }

protected float sigmoid(float x) {
    return
     (float)((1.0f/(1.0f+Math.exp((double)(-x))))-0.5f);
  }

protected float sigmoidP(float x) {
    double z = sigmoid(x) + 0.5f;
    return (float)(z * (1.0f - z));
  }

public static void main(String[] args) {
    Graph untitled11 = new Graph();
  }

private void jbInit() throws Exception {
    jPanel1 = new GraphPanel(data1, data2);
    jPanel1.setBackground(Color.white);
    this.setDefaultCloseOperation(3);
    this.getContentPane().add(jPanel1, BorderLayout.CENTER);
    setSize(550, 300);
    jPanel1.setVisible(true);
    setVisible(true);
  }
}

GraphPanel.java

2000-06-17T16:00:00Z

/**
 * Title: 
 * Description: 
 * Copyright: Copyright (c) 
 * Company: 
 * @author
 * @version 1.0
 */
import javax.swing.*;
import java.awt.*;

public class GraphPanel extends java.awt.Canvas { // JPanel {

public GraphPanel(float [] data1, float []data2) {
 super();
 this.data1 = data1;
 this.data2 = data2;
 }
 Color black = new Color(0, 0, 0);
 float [] data1;
 float [] data2;
 public void paint(Graphics g) {
 if (data1 == null || data2 == null) return;
 int width = this.getWidth();
 int height = this.getHeight();
 System.out.println("height="+height);
 float min = 99999999.9f;
 float max = -min;
 int maxindex = 0;
 float maxval = 0.0f;
 for (int i=0; i<data1.length; i++) { // assume length of data1 and data2 are the same
 if (min > data1[i]) min = data1[i];
 if (max < data1[i]) max = data1[i];
 if (min > data2[i]) min = data2[i];
 if (max < data2[i]) max = data2[i];
 }
 System.out.println("min=" + min +", max=" + max);
 g.setColor(Color.red);
 for (int i=0; i<data1.length - 1; i++) {
 float y1 = height - 5 - 0.95f *height * ((data1[i] - min) / (max - min));
 float y2 = height - 5 - 0.95f *height * ((data1[i+1] - min) / (max - min));
 //System.out.println("data["+i+"]="+data[i]+", y1="+y1+", y2="+y2);
 g.drawLine(i+20, (int)y1, i+21, (int)y2);
 y1 = height - 5 - 0.95f *height * ((data2[i] - min) / (max - min));
 y2 = height - 5 - 0.95f *height * ((data2[i+1] - min) / (max - min));
 //System.out.println("data["+i+"]="+data[i]+", y1="+y1+", y2="+y2);
 g.drawLine(i+20, (int)y1, i+21, (int)y2);
 }
 float yzero = height - 5 - 0.95f *height * ((0.0f - min) / (max - min));
 g.setColor(black);
 g.drawLine(20, (int)yzero, data2.length + 19, (int)yzero);
 g.drawLine(width / 2, height/2 - 118, width/2, height/2 + 118);
 g.drawString("Sigmoid", width / 2 - 100, 3 * height / 4 - 10);
 g.drawString("SigmoidP", width / 3 - 5, 1 * height / 4 + 10);
 g.drawString("-5", 4, (int)yzero);
 g.drawString("5", width - 19, (int)yzero);
 g.drawString("0.5", width/2 - 7, 12);
 g.drawString("-0.5", width/2 - 9, height - 3);
 }
}