#include <stdio.h>
#include <stdlib.h>
void LineGL(int x0,int y0,int x1,int y1)
{
glBegin (GL_LINES)
glColor3f (1.0f, 0.0f, 0.0f) glVertex2f (x0,y0)
glColor3f (0.0f, 1.0f, 0.0f) glVertex2f (x1,y1)
glEnd ()
}
struct outcode
{
unsigned all
unsigned left,right,top,bottom
}
struct Rectangle
{
float xmin,xmax,ymin,ymax
}
Rectangle rect
int x0,y0,x1,y1
GLboolean bClip = false
void compoutcode(float x,float y,Rectangle rect,outcode *outcode)
{
outcode->all=0
outcode->top=outcode->bottom=0
if(y>(float)rect.ymax)
{
outcode->top=1
outcode->all+=1
}
else if(y<(float)rect.ymin)
{
outcode->bottom=1
outcode->all+=1
}
outcode->right=outcode->left=0
if(x>(float)rect.xmax)
{
outcode->right=1
outcode->all+=1
}
else if(x<(float)rect.xmin)
{
outcode->left=1
outcode->all+=1
}
}
int cohensutherlandlineclip(Rectangle rect, int &x0,int &y0,int &x1,int &y1)
{
int accept,done
outcode outcode0,outcode1
outcode * outcodeout
float x,y
accept=0
done=0
compoutcode(x0,y0,rect,&outcode0)
compoutcode(x1,y1,rect,&outcode1)
do{
if(outcode0.all==0&&outcode1.all==0)
{
accept=1
done=1
}
else if(outcode0.all&outcode1.all!=0)
done=1
else
{
if(outcode0.all!=0)
outcodeout=&outcode0
else
outcodeout=&outcode1
if(outcodeout->left)
{
y=y0+(y1-y0)*(rect.xmin-x0)/(x1-x0)
x=(float)rect.xmin
}
else if(outcodeout->top)
{
x=x0+(x1-x0)*(rect.ymax-y0)/(y1-y0)
y=(float)rect.ymax
}
else if(outcodeout->right)
{
y=y0+(y1-y0)*(rect.xmax-x0)/(x1-x0)
x=(float)rect.xmax
}
else if(outcodeout->bottom)
{
x=x0+(x1-x0)*(rect.ymin-y0)/(y1-y0)
y=(float)rect.ymin
}
if(outcodeout->all==outcode0.all)
{
x0=xy0=ycompoutcode(x0,y0,rect,&outcode0)
}
else
{
x1=xy1=y
compoutcode(x1,y1,rect,&outcode1)
}
}
}while(!done)
if(accept)
LineGL(x0,y0,x1,y1)
return accept
}
void myDisplay()
{
glClear(GL_COLOR_BUFFER_BIT)
glColor3f (1.0f, 0.0f, 0.0f)
glRectf(rect.xmin,rect.ymin,rect.xmax,rect.ymax)
if (!bClip)
LineGL(x0,y0,x1,y1)
else
cohensutherlandlineclip(rect, x0,y0,x1,y1)
glFlush()
}
void Init()
{
glClearColor(0.0, 0.0, 0.0, 0.0)
glShadeModel(GL_FLAT)
rect.xmin=100//窗口的大小
rect.xmax=300
rect.ymin=100
rect.ymax=300
x0 = 450,y0 = 0, x1 = 0, y1 = 450//裁剪前的直线端点
printf("Press key 'c' to Clip!\nPress key 'r' to Restore!\n")
}
void Reshape(int w, int h)
{
glViewport(0, 0, (GLsizei) w, (GLsizei) h)
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
gluOrtho2D(0.0, (GLdouble) w, 0.0, (GLdouble) h)
}
void keyboard(unsigned char key, int x, int y)
{
switch (key)
{
case 'c':
bClip = true
glutPostRedisplay()//重画
break
case 'r':
bClip = false
Init()
glutPostRedisplay()//
break
case 'x':
exit(0)
break
default:
break
}
}
int main(int argc, char *argv[])
{
glutInit(&argc, argv)
glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE)
glutInitWindowPosition(100, 100)
glutInitWindowSize(640, 480)
glutCreateWindow("Hello World!")
Init()
glutDisplayFunc(myDisplay)
glutReshapeFunc(Reshape)
glutKeyboardFunc(keyboard)
glutMainLoop()
return 0
}
还有torbc？是turbo c吧？因为编译环境有些区别，而网上找的又都是VC的，所以都会遇到错误。
建议去装个VC的 ，毕竟VC比turbo c主流
这个要你自己给出起点和终点：#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <graphics.h>
void swap_start_end(int &x1,int &y1,int &x2,int &y2)
void s_line(int x1,int y1,int x2,int y2)
main()
{
int x1,y1,x2,y2
printf("Please input the start dot:\n")
scanf("%d%d",&x1,&y1)
printf("Please input the end dot:\n")
scanf("%d%d",&x2,&y2)
swap(x1,y1,x2,y2)
s_line(x1,y1,x2,y2)
}
void swap_start_end(int &x1,int &y1,int &x2,int &y2)
{
int mid
mid=x1
x1=y1
y1=mid
mid=x2
x2=y2
y2=mid
}
void s_line(int x1,int y1,int x2,int y2)
{
int driver=DETECT,mode
int curx,cury,dx,dy,tx,ty,mid,d,flag,i
initgraph(&driver,&mode,"")
curx=x1
cury=y1
dx=abs(x2-x1)
dy=abs(y2-y1)
if(x2-x1>=0)
tx=1
else
tx=-1
if(y2-y1>=0)
ty=1
else
ty=-1
if(dx>dy)
flag=0
else
{
flag=1
mid=dxdx=dydy=mid
mid=txtx=tyty=mid
mid=x1x1=y1y1=mid
mid=x2x2=y2y2=mid
}
if(flag)
putpixel(cury,curx,2)
else
putpixel(curx,cury,2)
d=2*dy-dx
for(i=0i<dxi++)
{
if(d>=0)
{
d=d+2*(dy-dx)
cury+=ty
}
else
d=d+2*dy
curx+=tx
if(flag)
putpixel(cury,curx,2)
else
putpixel(curx,cury,2)
}
getch()
closegraph()
}
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