exam11_3.java

java学习课件

/* 程序名Exam11_3.java */
import java.awt.*;
import java.awt.geom.*;
import java.applet.*;
public class Exam11_3 extends Applet
{
   public void paint(Graphics g)
   {
    Graphics2D g2d = (Graphics2D)g; // 强制转换为Graphics2D引用
    float x[]={10,35,60,85,110,135,160,185,210,235,260,285,310};
    float y[]={100,50,100,50,100,50,100,50,100,50,100,50,100};
    GeneralPath line = new GeneralPath(); // 构建GeneralPath类对象
    line.moveTo(x[0],y[0]);   // 将起始点加入路径
    for(int i=1; i<x.length;i++) line.lineTo(x[i],y[i]);//将折线的坐标点加入路径
    g2d.draw(line);  //绘制折线
    g2d.setColor(Color.BLUE); //设置颜色
    for(int i=1; i<x.length-1; i=i+2)
    { 
     QuadCurve2D.Float c1=new QuadCurve2D.Float(x[i-1],y[i-1],x[i],y[i],x[i+1], y[i+1]);  //定义曲线1
     g2d.draw(c1);  //绘制曲线
    }
    g2d.setColor(Color.red); //设置颜色 
    for(int i=1; i<x.length-2; i=i+3)
    { 
     CubicCurve2D.Float c1=new CubicCurve2D.Float(x[i-1],y[i-1],x[i],y[i],x[i+1], y[i+1],x[i+2],y[i+2]);
     g2d.draw(c1);  //绘制曲线
    } 
   }
}