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66 lines (51 loc) · 1.14 KB
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Copy pathgamefilling.cpp
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66 lines (51 loc) · 1.14 KB
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#include<GL/gl.h>
#include<GL/glut.h>
float x1,x2,x3,x4,y1,y2,y3,y4;
void draw_pixel(int x,int y)
{
glPointSize(1.0);
glBegin(GL_POINTS);
glVertex2i(x,y);
glEnd();
}
void edgedetect(float x1,float y1,float x2,float y2,int *le,int *re)
{
float temp,x,mx;
int i;
if(y1>y2)
{
temp=x1,x1=x2,x2=temp;
temp=y1,y1=y2,y2=temp;
}
if(y1==y2)
mx=x2-x1;
else
mx=(x2-x1)/(y2-y1);
x=x1;
for(i=int(y1);i<=(int)y2;i++)
{
if(x<(float)le[i]) le[i]=(int)x;
if(x>(float)re[i]) re[i]=(int)x;
x+=mx;
}
}
void scanfill(float x1,float y1,float x2,float y2,float x3,float y3,float x4,float y4)
{
int le[600],re[600],i,j;
for(i=0;i<600;i++)
le[i]=600,re[i]=0;
edgedetect(x1,y1,x2,y2,le,re);
edgedetect(x2,y2,x3,y3,le,re);
edgedetect(x3,y3,x4,y4,le,re);
edgedetect(x4,y4,x1,y1,le,re);
for(j=0;j<600;j++)
{
if(le[j]<=re[j])
for(i=le[j];i<re[j];i++)
draw_pixel(i,j);
}
}
void gamedisplay(int x1,int y1,int x2,int y2,int x3,int y3,int x4,int y4)
{
scanfill(x1,y1,x2,y2,x3,y3,x4,y4);
}