sinapplet.java

来自「介绍有关java的资料 课件 相当一本书籍 里面都是很基础的知识」· Java 代码 · 共 44 行

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.awt.Graphics;

public class SinApplet extends Applet {
  boolean isStandalone = false;
  int Phase;

  double f(double x) {
    return (Math.sin(Phase + x/7) + 2) * size().height / 4;
  }
  /**Get a parameter value*/
  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
      (getParameter(key) != null ? getParameter(key) : def);
  }

  /**Construct the applet*/
  public SinApplet() {
  }
  /**Initialize the applet*/
  public void init() {
    try {
      Phase = Integer.parseInt(this.getParameter("Phase", "90"));
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**Get parameter info*/
  public String[][] getParameterInfo() {
    String[][] pinfo =
      {
      {"Phase", "int", "Phase"},
      };
    return pinfo;
  }
  public void paint(Graphics g) {
    for (int x = 0 ; x < size().width ; x++) {
      g.drawLine(x, (int)f(x), x + 1, (int)f(x + 1));
    }
  }
}