www.carfield.com.hk: GraphPanel.java

Sat Jun 17 16:00:00 GMT 2000

GraphPanel

/**
 * Title:        <p>
 * Description:  <p>
 * Copyright:    Copyright (c) <p>
 * Company:      <p>
 * @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);
  }
}

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