//
// RecomputeSeg
//
// Fill in the fields 'angle', 'len', 'pdx', 'pdy', etc...
//
void RecomputeSeg(seg_t *seg)
{
seg->psx = seg->start->x;
seg->psy = seg->start->y;
seg->pex = seg->end->x;
seg->pey = seg->end->y;
seg->pdx = seg->pex - seg->psx;
seg->pdy = seg->pey - seg->psy;
seg->p_length = UtilComputeDist(seg->pdx, seg->pdy);
seg->p_angle = UtilComputeAngle(seg->pdx, seg->pdy);
if (seg->p_length <= 0)
InternalError("Seg %p has zero p_length.", seg);
seg->p_perp = seg->psy * seg->pdx - seg->psx * seg->pdy;
seg->p_para = -seg->psx * seg->pdx - seg->psy * seg->pdy;
}
//
// NewVertexDegenerate
//
vertex_t *NewVertexDegenerate(vertex_t *start, vertex_t *end)
{
float_g dx = end->x - start->x;
float_g dy = end->y - start->y;
float_g dlen = UtilComputeDist(dx, dy);
vertex_t *vert = NewVertex();
vert->ref_count = start->ref_count;
if (lev_doing_normal)
{
vert->index = num_normal_vert;
num_normal_vert++;
}
else
{
vert->index = num_gl_vert | IS_GL_VERTEX;
num_gl_vert++;
}
// compute new coordinates
vert->x = start->x;
vert->y = start->x;
if (dlen == 0)
InternalError("NewVertexDegenerate: bad delta !");
dx /= dlen;
dy /= dlen;
while (I_ROUND(vert->x) == I_ROUND(start->x) &&
I_ROUND(vert->y) == I_ROUND(start->y))
{
vert->x += dx;
vert->y += dy;
}
return vert;
}
