show_1.java

本程序用JAVA编制

package curve;

import java.awt.*;
import javax.swing.JFrame;
import java.util.*;
import java.awt.event.*;

public class Show_1 extends Canvas {
  Image bufferImage;  // 缓冲图像
  Graphics bufferGC;  // 图形设备环境
  curve c;            // 曲线对象
  static LookXml xml=new LookXml();        // xml数据对象
  int graphWidth;     // 图形区域的宽度
  int graphHeight;    // 图形区域的高度
  Vector v;           // 统计数据矢量
  static Dimension d = new Dimension(600,500);
  static Vector xmlVector=new Vector();
  float ytop;
  boolean flag=true;

  // 初始化
  public void init(){
    this.setBackground(Color.white);
    graphHeight=d.height-50;
    graphWidth =d.width-60;
    bufferImage=createImage(graphWidth,graphHeight); // 创建图形的绘制环境
    bufferGC=bufferImage.getGraphics();
    c=new curve(bufferGC);  // 与绘制环境相关的曲线对象
    ytop=c.getMaxY(xmlVector);
  }

  // 绘制图像
  public void paint(Graphics g){
    if(flag){
      init();
      flag=false;
    }
    paintCurve();
    g.drawImage(bufferImage,20,5,this);
  }


  // 使用Curve的方法--画曲线
  public void paintCurve(){
    int xCount=xmlVector.size();
    c.clearXHashMarks();
    c.clearYHashMarks();
    c.clearScreen();
    c.drawAxes(graphWidth,graphHeight);
    c.makeHashMarks(xCount,ytop); // x轴刻度数
    c.showData(xmlVector);
    //repaint();
  }

  public static void main(String[] args) {
    Show_1 show = new Show_1();
    Frame f=new Frame("testing curve");
    xmlVector=xml.LookXml("new-xml/test.xml",2);
    f.addWindowListener(new WindowAdapter(){
      public void windowClosing(WindowEvent e){System.exit(0);}
    });
    f.setLayout(new BorderLayout());
    f.add(show,"Center");
    f.setSize(d);
    f.setVisible(true);

  }
}