void main()
{
int gm=DETECT,gd;
initgraph(&gm,&gd,"C:\\TC\\BGI");
DDA(100,100,200,100);
DDA(200,100,200,200);
DDA(200,200,100,200);
DDA(100,200,1000,100);
BresenhamLine(100,100,150,10);
BresenhamLine(133,133,150,10);
BresenhamLine(200,100,150,10);
BresenhamLine(233,133,150,10);
DDA(133,133,233,133);
DDA(233,133,233,233);
DDA(233,233,133,233);
DDA(133,233,133,133);
BresenhamLine(100,100,133,133);
BresenhamLine(100,200,133,233);
BresenhamLine(200,100,233,133);
BresenhamLine(200,200,233,233);
getch();
closegraph();
}
void SwglLine(GLdouble x1, GLdouble y1, GLdouble z1, GLdouble x2, GLdouble y2, GLdouble z2)
{
//copy to homogenous coordinate
GLdouble h1[4]={x1, y1, z1, 1.0};
GLdouble h2[4]={x2, y2, z2, 1.0};
GLdouble w1[4]={x1, y1, 0, 1.0}; //window coordinate
GLdouble w2[4]={x2, y2, 0, 1.0};
//implement the opengl pipeline here
swTransformation(h1, w1);
swTransformation(h2, w2);
////draw the 2D line
//glBegin(GL_LINES);
// //glColor3fv(colors[index1]);
// glVertex2f(w1[0], w1[1]);
// //glColor3fv(colors[index2]);
// glVertex2f(w2[0], w2[1]);
//glEnd();
//implement
switch(DRAWTYPE) {
case 0:
{
writepixel(w1[0], w1[1], 0, 1, 0, 0); //writepixel(w1[0], w1[1], 1, 0, 0);
writepixel(w2[0], w2[1], 0, 0, 1, 0); //writepixel(w1[0], w1[1], 1, 0, 0);
}
break;
case 1: case 2: case 3:
{
GLdouble col[4];
glGetDoublev(GL_CURRENT_COLOR, col);
BresenhamLine(w1[0], w1[1], w1[2], w2[0], w2[1], w2[2], col[0], col[1], col[2]);
}
break;
}
}
