carfield.com.hk

Graph.class

2000-06-15T16:00:00Z

Graph.java

2000-06-15T16:00:00Z

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 [] data;
 public Graph() {
 try {
 int size = 500;
 data = new float[size];
 float xmin = 0;
 float xmax = 10;
 for (int i=0; i<size; i++) {
 float x = i;
 x = xmin + x * (xmax - xmin) / (float)size;
 if (i==190) System.out.println("x="+x);
 float x1 = (float)Math.sin(x);
 float x2 = (float)Math.sin(x * 0.4f);
 float x3 = (float)Math.sin(x * 3.0f);
 data[i] = x1 * x2 * x3;
 }
 jbInit();
 }
 catch(Exception e) {
 e.printStackTrace();
 }
 }

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

private void jbInit() throws Exception {
    jPanel1 = new GraphPanel(data);
    jPanel1.setBackground(Color.white);
    this.setDefaultCloseOperation(3);
    this.getContentPane().add(jPanel1, BorderLayout.CENTER);
    setSize(550, 500);
    jPanel1.setVisible(true);
    setVisible(true);
  }
}

GraphPanel.class

2000-06-15T16:00:00Z

GraphPanel.java

2000-06-15T16:00:00Z

/**
 * 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 [] data) {
 super();
 this.data = data;
 }
 Color black = new Color(0, 0, 0);
 float [] data;
 public void paint(Graphics g) {
 if (data == 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<data.length; i++) {
 if (min > data[i]) min = data[i];
 if (max < data[i]) {
 max = data[i];
 maxindex = i;
 maxval = max;
 }
 }
 System.out.println("min=" + min +", max=" + max +
 ", max index="+maxindex + ", max val="+maxval);
 g.setColor(black);
 for (int i=0; i<data.length - 1; i++) {
 float y1 = height - 5 - 0.95f *height * ((data[i] - min) / (max - min));
 float y2 = height - 5 - 0.95f *height * ((data[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.drawLine(20, (int)yzero, data.length + 19, (int)yzero);
 }
}

UnnamedPackage.dependency

2000-06-15T16:00:00Z

dependency cache.dfPackage

2000-06-15T16:00:00Z

graph.jpr

2000-06-15T16:00:00Z

misc.dfPackage

2000-06-15T16:00:00Z