使用OpenGL编程实现Bresenham直线扫描转换算法

实验要求：

学习Visual C++ 6.0 集成编程环境的使用，OpenGL编程环境的设置，OpenGL语法及基本函数的使用等基础知识，并编程实现Bresenham直线扫描转换算法，得出相应的输出图形。

源程序：

#include

void k1() //0

{

glClear(GL_COLOR_BUFFER_BIT);

glColor3f(0.0,0.0,1.0);

glBegin(GL_POINTS);

GLint x1=0,y1=0,x2=400,y2=200;

GLint x=x1,y=y1;

GLint dx=x2-x1,dy=y2-y1,dT=2*(dy-dx),dS=2*dy;

GLint d=2*dy-dx;

glV ertex2i(x,y);

while(x

{

x++;

if(d<0)

d=d+dS;

else

{

y++;

d=d+dT;

}

glV ertex2i(x,y);

}

glEnd();

glFlush();

}

void k2() //k>1

{

glClear(GL_COLOR_BUFFER_BIT);

glColor3f(0.0,1.0,0.0);

glBegin(GL_POINTS);

GLint x1=0,y1=0,x2=200,y2=400;

GLint x=x1,y=y1;

GLint dx=x2-x1,dy=y2-y1,dT=2*(dx-dy),dS=2*dx;

GLint d=2*dx-dy;

glV ertex2i(x,y);

while(y

{

y++;

if(d<0)

d=d+dS;

else

{

x++;

d=d+dT;

}

glV ertex2i(x,y);

}

glEnd();

glFlush();

}

void k3() //-1

{

glClear(GL_COLOR_BUFFER_BIT);

glColor3f(1.0,0.0,0.0);

glBegin(GL_POINTS);

GLint x1=0,y1=400,x2=400,y2=200;

GLint x=x1,y=y1;

GLint dx=x2-x1,dy=y2-y1,dT=2*dy,dS=2*dy+2*dx;

GLint d=2*dy-dx;

glV ertex2i(x,y);

while(x

{

x++;

if(d<0)

{

y--;

d=d+dS;

}

else

d=d+dT;

glV ertex2i(x,y);

}

glEnd();

glFlush();

}

void k4() //k<-1

{

glClear(GL_COLOR_BUFFER_BIT);

glColor3f(1.0,0.0,1.0);

glBegin(GL_POINTS);

GLint x1=0,y1=400,x2=200,y2=0;

GLint x=x1,y=y1;

GLint dx=x2-x1,dy=y2-y1,dT=-2*dy-2*dx,dS=-2*dx;

GLint d=-dy-2*dx;

glV ertex2i(x,y);

while(y>y2)

{

y--;

if(d>0)

d=d+dS;

else

{

x++;

d=d+dT;

}

glV ertex2i(x,y);

}

glEnd();

glFlush();

}

void main(int argc,char ** argv)

{

glutInit(&argc,argv);

glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);

glutInitWindowSize(400,400);

glutInitWindowPosition(200,100);

glutCreateWindow("0

glClearColor(1.0,1.0,0.0,0.0);

gluOrtho2D(0.0,400.0,0.0,400.0);

glutDisplayFunc(k1);

glutCreateWindow("1

glClearColor(1.0,0.0,1.0,0.0);

gluOrtho2D(0.0,400.0,0.0,400.0);

glutDisplayFunc(k2);

glutCreateWindow("-1

glClearColor(0.0,1.0,1.0,0.0);

gluOrtho2D(0.0,400.0,0.0,400.0);

glutDisplayFunc(k3);

glutCreateWindow("K<-1(k=-2)");

glClearColor(0.0,1.0,0.0,0.0);

gluOrtho2D(0.0,400.0,0.0,400.0);

glutDisplayFunc(k4);

glutMainLoop();

}