lineapp.java

来自「javascript source code part2」· Java 代码 · 共 59 行

import java.applet.Applet;
import java.awt.*;

class aLine {
  int startX;
  int startY;
  int endX;
  int endY;
  
  Color lineColor;
  public aLine(int sx,int sy,int ex,int ey,Color clr)
   {
         startX = sx;
         startY = sy;
         endX = ex;
         endY = ey;
         lineColor = clr;
    }
  public void draw(Graphics g)
   {
     g.setColor(lineColor);
     g.drawLine(startX, startY, endX, endY);
   }
   
};
public class LineApp extends Applet {
  int initCount = 0;
  int startCount = 0;
  int stopCount = 0;
  int destroyCount = 0;
  static int drawIndex = 0;
  static aLine drawList[] = new aLine[500];
  
 public void paint(Graphics g){
   g.setColor(Color.white);
   g.fillRect(0,0,size().width,size().height);

   for (int i=0; i<drawIndex; i++)
     drawList[i].draw(g);
   
}
public void drawLine(int sx, int sy, int ex, int ey, int clr)
{
drawList[drawIndex] = new aLine(sx,sy,ex,ey, Color.red);
drawIndex++;
repaint();
}
public void clearAll()
{
drawIndex = 0;

repaint();
}
public void update(Graphics g) {
   paint(g);
}

}