Cube :: Cube ()
{ -
//1. init vertices
for (int i = 0; i < 8; i++ ) {
vertex [i].x = i & 1 ? 1.0 : 0.0; vertex [i].y = i&2 7 1.0:0.0; vertex [i].z = »&4 7 1.0:0.0;
}
II2. init edges
initEdge(0, 0,1,2,4); initEdge(1, 1,3,1,4); initEdge (2, 3,2,3,4); initEdge (3, 2,0,0,4); initEdge ( 4, 4, 5, 2, 5 ); initEdge (5, 5,7,1,5); initEdge ( 6, 7, 6, 3, 5 ); initEdge ( 7, 6, 4, 0, 5 ); initEdge (8, 0,4,0,2); initEdge (9, 1,5, 1,2); initEdge (10, 3, 7, 1, 3 ); initEdge (11, 2, 6, 0,3);
// 3. init facets
initFacet ( 0, 4, 6, 2, 0 ); initFacet (1, 1,3,7,5); initFacet ( 2, 0,1, 5, 4 ); initFacet (3, 6,7,3,2); initFacet (4, 2, 3, 1,0); initFacet ( 5, 4, 5, 7, 6 );
}
void Cube :: computeNormals ()
{
for (int i = 0; i < 6; i++ )
facet [i].n = ( vertex [facet [i].v [1]] - vertex [facet [i].v [0]]) A ( vertex [facet [i].v [2]] - vertex [facet [i].v [1]]);
}
void Cube :: apply ( Matrix& m ) {
for (int i = 0; i < 8; i++ ) vertex [i] = m * vertex [i];
}
void Cube :: draw () {10. Удаление невидимых линий и поверхносте
Point p [8]; Point contour [4]; Vector v; int color;
// project vertices for (int i = 0; i < 8; i++ )
{
v = prj * vertex [i]; p [i].x = (int) v.x; p[i].y = (int) v.y;
}
computeNormals ();
for (i = 0; i < 6; i++ )
facet [i].flags = isFrontFacing (i, eye );
// draw all faces for (i = 0; i < 6; i++ ) if (facet [i] .flags )
{
int color = -(facet [i].n & light )*7+8;
for (int j = 0; j < 4; j++ )
contour [j] = p [facet [i].v [j]];
setcolor (color);
setfillstyle ( SOLID_FILL, color);
fillpoly ( 4, (int far *) contour);
}
}
main () {
Cube cube; Matrix trans; int drv =VGA; int mode = VGAMED; palette type pal;
// prepare projection matrix prj.x [2][2] = 0; prj.x [3][2] = 1;
prj = Scale ( Vector3D ( 640, 350, 0 )) * prj; prj = Translate ( Vector3D ( 320, 175, 0 )) * prj;
cube.apply ( Translate ( Vector (1,1,4)));
initgraph ( &drv, &mode, "C:\\BORLANDC\\BGI" );
getpalette (&pal);
for (int i = 0; i < pal.size; i++ )
setrgbpalette ( pal.colors [j], (63*i)/15, (63*i)/15,