计算机图形学实验报告2014

PAGE13-计算机图形学课程实验报告实验题目：班级：姓名：学号指导教师：日期：信息与计算机工程学院2014实验2基本图形生成算法实验2基本图形生成算法2.1直线的绘制一、实验目的1、通过实验，进一步理解和掌握DDA和Bresenham算法；2、掌握以上算法生成直线段的基本过程；3、通过编程，会在TC环境下完成DDA或中点算法实现直线段的绘制。二、实验环境计算机、Turbo

C或其他C语言程序设计环境

三、实验要求：1.每个学生单独完成；2.开发语言为TurboC或C++，也可使用其它语言；3.请在自己的实验报告上写明姓名、学号、班级；4.每次交的实验报告内容包括：题目、试验目的和意义、程序制作步骤、主程序、运行结果图以及参考文件；5.自己保留一份可执行程序,考试前统一检查和上交。四、实验内容用DDA算法或Besenham算法实现斜率k在0和1之间的直线段的绘制。五、实验步骤1、算法、原理清晰，有详细的设计步骤；2、依据算法、步骤或程序流程图，用C语言编写源程序；3、编辑源程序并进行调试；4、进行运行测试，并结合情况进行调整；5、对运行结果进行保存与分析；6、把源程序以文件的形式提交；7、按格式书写实验报告。六、实验代码1、DDA#include"graphics.h"#include"stdlib.h"#include"stdio.h"#include"conio.h"#include"math.h"voidDDALine(intx1,inty1,intx2,inty2,intcolor){floatx,y,dx,dy,k;dx=(float)(x2-x1);dy=(float)(y2-y1);k=dy/dx;y=y1;x=x1;if(abs(k)<1)if(x1<=x2)for(x=x1;x<=x2;x++){putpixel(x,(int)(y+0.5),color);y=y+k;}elsefor(x=x1;x>=x2;x--){putpixel(x,(int)(y+0.5),color);y=y-k;}elseif(y1<=y2)for(y=y1;y<=y2;y++){putpixel((int)(x+0.5),y,color);x=x+1/k;}elsefor(y=y1;y>=y2;y--){putpixel((int)(x+0.5),y,color);x=x-1/k;}}main(){intgmode,gdriver;gdriver=DETECT;initgraph(&gdriver,&gmode,"D:\Win-TC\project");setbkcolor(WHITE);DDALine(200,200,350,260,RED);getch();closegraph();}2、中点画线：#include"graphics.h"#include"stdlib.h"#include"stdio.h"#include"conio.h"#include"math.h"voidMPLine(intx1,inty1,intx2,inty2,intcolor)/*适用于0<k<1,x1<=x2的情况*/{inta,b,d1,d2,d,x,y;a=y1-y2;b=x2-x1;d=2*a+b;d1=2*a;d2=2*(a+b);x=x1;y=y1;putpixel(x,y,color);while(x<x2){if(d<0){x++;y++;d=d+d2;}else{x++;d=d+d1;}putpixel(x,y,color);}}main(){intgmode,gdriver;gdriver==DETECT;initgraph(&gdriver,&gmode,"D:\Win-TC\project");setbkcolor(WHITE);MPLine(200,200,300,400,RED);getch();closegraph();}3、Bresenham：#include"graphics.h"#include"stdlib.h"#include"stdio.h"#include"conio.h"#include"math.h"voidBresenhamLine(intx1,inty1,intx2,inty2,intc){inti,s1,s2,interchange;floatx,y,deltax,deltay,e,temp;x=x1;y=y1;deltax=abs(x2-x1);deltay=abs(y2-y1);if(x2-x1>=0)s1=1;elses1=-1;if(y2-y1>=0)s2=1;elses2=-1;if(deltay>deltax){temp=deltax;deltax=deltay;deltay=temp;interchange=1;}elseinterchange=0;e=2*deltay-deltax;putpixel(x,y,c);for(i=1;i<=deltax;i++){if(e>=0){x=x+s1;y=y+s2;e=e-2*deltax+2*deltay;}else{if(interchange==1)y=y+s2;elsex=x+s1;e=e+2*deltay;}putpixel(x,y,c);}}main(){intgmode,gdriver;gdriver=DETECT;initgraph(&gdriver,&gmode,"D:\Win-TC\project");setbkcolor(WHITE);BresenhamLine(200,200,350,260,RED);getch();closegraph();}七、实验结果1、2、2.2圆和椭圆的绘制2.2.1实验目的1、通过实验，进一步理解和掌握中点和Bresenham算法；2、掌握以上算法生成圆或椭圆的基本过程；3、通过编程，会在TC环境下完成椭圆或圆的绘制。2.2.2实验环境计算机、TurboC或其他C语言程序设计环境

2.2.3实验要求：同2.12.2.4实验内容用中点（Besenham）算法实现椭圆或圆的绘制。2.2.5实验步骤1、算法、原理清晰，有详细的设计步骤；2、依据算法、步骤或程序流程图，用C语言编写源程序；3、编辑源程序并进行调试；4、进行运行测试，并结合情况进行调整；5、对运行结果进行保存与分析；6、把源程序以文件的形式提交；7、按格式书写实验报告。2.2.6实验代码1、中点画圆#include"graphics.h"#include"stdlib.h"#include"stdio.h"#include"conio.h"#include"math.h"voidCirclePoint(intx,inty,intcolor){putpixel(x+100,y+100,color);putpixel(-x+100,y+100,color);putpixel(x+100,-y+100,color);putpixel(-x+100,-y+100,color);putpixel(y+100,x+100,color);putpixel(y+100,-x+100,color);putpixel(-y+100,x+100,color);putpixel(-y+100,-x+100,color);}voidMidCircle(intr,intcolor){intx,y,d;x=0;y=r;d=1-r;while(x<=y){CirclePoint(x,y,color);if(d<0)d+=2*x+3;else{d+=2*(x-y)+5;y--;}x++;}}main(){intgmode,gdriver;gdriver=DETECT;initgraph(&gdriver,&gmode,"D:\Win-TC\project");setbkcolor(WHITE);MidCircle(60,RED);getch();closegraph();}2、Bresenham画圆#include"graphics.h"#include"stdlib.h"#include"stdio.h"#include"conio.h"#include"math.h"voidBresenhamCircle(intxc,intyc,intr,intc){intx,y;floatd;x=0;y=r;d=3-2*r;putpixel((xc+x),(yc+y),c);putpixel((xc-x),(yc+y),c);putpixel((xc+x),(yc-y),c);putpixel((xc-x),(yc-y),c);putpixel((xc+y),(yc+x),c);putpixel((xc-y),(yc+x),c);putpixel((xc+y),(yc-x),c);putpixel((xc-y),(yc-x),c);while(x<y){if(d>0){d=d+4*(x-y)+10;y--;x++;}else{d=d+4*x+6;x++;}putpixel((xc+x),(yc+y),c);putpixel((xc-x),(yc+y),c);putpixel((xc+x),(yc-y),c);putpixel((xc-x),(yc-y),c);putpixel((xc+y),(yc+x),c);putpixel((xc-y),(yc+x),c);putpixel((xc+y),(yc-x),c);putpixel((xc-y),(yc-x),c);}}main(){intgmode,gdriver;gdriver=DETECT;initgraph(&gdriver,&gmode,"D:\Win-TC\project");setbkcolor(WHITE);BresenhamCircle(100,100,50,RED);getch();closegraph();}3、中点画椭圆代码1：#include"graphics.h"#include"stdlib.h"#include"stdio.h"#include"conio.h"#include"math.h"voidMidBresenhamEllipse(inta,intb,intcolor){intx,y;floatd1,d2;x=0;y=b;d1=b*b+a*a*(-b+0.5);putpixel(x+100,y+100,color);putpixel(-x+100,-y+100,color);putpixel(-x+100,y+100,color);putpixel(x+100,-y+100,color);while(b*b*(x+1)<a*a*(y-0.5)){if(d1<=0){d1+=b*b*(2*x+3);x++;}else{d1+=b*b*(2*x+3)+a*a*(-2*y+2);x++;y--;}putpixel(x+100,y+100,color);putpixel(-x+100,-y+100,color);putpixel(-x+100,y+100,color);putpixel(x+100,-y+100,color);}d2=b*b*(x+0.5)*(x+0.5)+a*a*(y-1)*(y-1)-a*a*b*b;while(y>0){if(d2<=0){d2+=b*b*(2*x+2)+a*a*(-2*y+3);x++;y--;}else{d2+=a*a*(-2*y+3);y--;}putpixel(x+100,y+100,color);putpixel(-x+100,-y+100,color);putpixel(-x+100,y+100,color);putpixel(x+100,-y+100,color);}}main(){intgmode,gdriver;gdriver=DETECT;initgraph(&gdriver,&gmode,"D:\Win-TC\project");setbkcolor(WHITE);MidBresenhamEllipse(20,8,RED);getch();closegraph();}代码2：#include"graphics.h"#include"stdlib.h"#include"stdio.h"#include"conio.h"#include"math.h"voidMPEllipse(longa,longb,longxc,longyc,intc){longx,y;doubled1,d2;x=0;y=b;d1=b*b+a*a*(-b