ALGORITHME DE LIGNES

void MyLine(int xdep, int ydep, int xfin, int yfin)
{
   float a=0;
   int temp=0;
   int cste=0;
   
   unsigned int dy;
   unsigned int dx;
   
   dx=abs(xfin-xdep);
   dy=abs(yfin-ydep);
if(dx>=dy && dx!=0 && dy!=0)
{      
   if(xdep>xfin)
   {
      temp=xdep;
      xdep=xfin;
      xfin=temp;
   
      temp=ydep;
      ydep=yfin;
      yfin=temp;
   }
   a=((float)(yfin-ydep)/(xfin-xdep));
   
   for(int x=0;x<dx+1;x++)
   {
      putpixel(buffer,x+xdep,ydep+(x*a)+cste,makecol(255,255,255));
   }
}

if(dx<dy && dx!=0 && dy!=0)
{
   if(ydep>yfin)
   {
   temp=ydep;
   ydep=yfin;
   yfin=temp;
   
   temp=xdep;
   xdep=xfin;
   xfin=temp;
   }
   a=((float)(xfin-xdep)/(yfin-ydep));
   
   for(int y=0;y<dy+1;y++)
   {
      putpixel(buffer,xdep+(y*a)+cste,y+ydep,makecol(255,255,255));
   }
}

if(dx==0)
{
   if(ydep>yfin)
   {
      temp=ydep;
      ydep=yfin;
      yfin=temp;
   }
   for(int y=ydep;y<yfin+1;y++)
   putpixel(buffer,xdep,y,makecol(255,255,255));
}
if(dy==0)
{
      if(xdep>xfin)
   {
      temp=xdep;
      xdep=xfin;
      xfin=temp;
   }
   for(int x=xdep;x<xfin+1;x++)
   putpixel(buffer,x,ydep,makecol(255,255,255));
}
}