计算机图形学第三次实验报告

计算机图形学第三次实验报告

Java 姓名所使用的语

言

学号完成日期16/12/3实验任务1

1、已知第55页Bresenham可以绘制1/4圆，请利用旋转变换

绘制完整圆

import .*;

import .*;

import

import .*;

public class Bresenham extends Applet

{ public void paint(Graphics g)

{ Graphics2D g2=(Graphics2D)g;

;

int r=100, x, y, e, x1, y1;

double xx, yy;

x=0; y=r; e=1-r;

while(x

{ ;

if(e<0)

{e=e+2*x+3;x++;}

else

{e=e+2*(x-y)+5;x++;y=y-1;}

(x+200,y+200,1,1);

xx=*x+*y ; yy=*x+*y;

x1=(int)(xx); y1=(int)(yy);

(x1+200,y1+200,1,1);

x1=y ; y1=-x; (x1+200,y1+200,1,1);

x1=-y ; y1=x; (x1+200,y1+200,1,1);

xx=**y ; yy=*x+*y;

x1=(int)(xx) ; y1=(int)(yy) ;

(x1+200,y1+200,1,1);

xx=*x+*y ; yy=**y;

x1=(int)(xx) ; y1=(int)(yy) ;

(x1+200,y1+200,1,1);

x1=-x; y1=-y; (x1+200,y1+200,1,1);

xx=**y ; yy=**y;

x1=(int)(xx) ; y1=(int)(yy) ;

(x1+200,y1+200,1,1);

}

}

}

2、已知第57页中点算法可以绘制1/4椭圆，请利用旋转变换绘制完整椭

圆

import .*;

import .*;

import

import .*;

public class mid_circle extends Applet

{ public void paint(Graphics g)

{ Graphics2D g2=(Graphics2D)g;

;

int r=100, x, y, e, x1, y1;

double xx, yy;

x=0; y=r; e=2*(1-r);

while(x

{ ;

if(e<0)

{e=e+2*x+3;x++;}

Else

{e=e+2*(x-y)+5;x++;y=y-1;}

(x+200,y+200,1,1);

xx=*x+*y ; yy=*x+*y;

x1=(int)(xx);

y1=(int)(yy); (x1+200,y1+200,1,1);

x1=y ; y1=-x;

(x1+200,y1+200,1,1);

x1=-y ; y1=x; (x1+200,y1+200,1,1);

xx=**y ; yy=*x+*y;

x1=(int)(xx; y1=(int)(yy) ;

(x1+200,y1+200,1,1);

xx=*x+*y ; yy=**y; x1=(int)(xx) ;

y1=(int)(yy) ; (x1+200,y1+200,1,1);

x1=-x; y1=-y; (x1+200,y1+200,1,1);

xx=**y ; yy=**y;

x1=(int)(xx) ; y1=(int)(yy) ;

(x1+200,y1+200,1,1);

}

}

}

实验任务2 :

将一矩形平移x=200,y=200,并将x缩小1/5的程序

import

import

import

import

import

public class a extends JApplet{

public void paint(Graphics g)

{

Graphics2D g2=(Graphics2D)g;

int x[]={20,220,220,20,20},y[]={100,100,200,200,100};

(x, y,5);

for(int i=0;i<;i++){

x[i]=x[i]+200;

y[i]=y[i]+200;

;

}

for(int i=0;i<;i++){

x[i]=x[i]/5;

;

}

(x, y,5);

}

}

实验任务3:

将一矩形完成以下变换矩阵工作

import

import

import

import

public class jihebianhuan extends JApplet{

public void paint(Graphics g)

{

Graphics2D g2=(Graphics2D)g;

int x[]={40,100,100,40,40},y[]={80,80,140,140,80};

(x, y,5);

for(int i=0;i<;i=i+5){

x[i]=x[i]/2-y[i]+200;x[i+1]=x[i+1]/2-y[i+1]+200;

x[i+2]=x[i+2]/2-y[i+2]+200;

x[i+3]=x[i+3]/2-y[i+3]+200;

x[i+4]=x[i+4]/2-y[i+4]+200;

y[i]=x[i]*2/3+y[i]*2+200;

y[i+1]=x[i+1]*2/3+y[i+1]*2+200;y[i+2]=x[i+2]*2/3+y[i+2

]*2+200;

y[i+3]=x[i+3]*2/3+y[i+3]*2+200;y[i+4]=x[i+4]*2/3+y[i+4

]*2+200;; }

(x, y,5); }

}

实验任务4:给出任意三角形进行几何变换

import

import

import

import

public class sanjiaoxing extends JApplet{

public void paint(Graphics g) {

Graphics2D g2=(Graphics2D)g;

int x[]={15,60,30,15},y[]={30,30,60,30};

(x, y,4);

for(int i=0;i<;i=i+4){

x[i]=x[i]*2-y[i]+20;

x[i+1]=x[i+1]*2-y[i+1]+20;

x[i+2]=x[i+2]*2-y[i+2]+20;

x[i+3]=x[i+3]*2-y[i+3]+20;

y[i]=x[i]/3+y[i]*2-10;