static void calc_ray_shift(rcti *rect, float x, float y, const float source[2], float ray_length)
{
float co[2] = {(float)x, (float)y};
float dir[2], dist;
/* move (x,y) vector toward the source by ray_length distance */
sub_v2_v2v2(dir, co, source);
dist = normalize_v2(dir);
mul_v2_fl(dir, min_ff(dist, ray_length));
sub_v2_v2(co, dir);
int ico[2] = {(int)co[0], (int)co[1]};
BLI_rcti_do_minmax_v(rect, ico);
}
/* Convert the object-space axis-aligned bounding box (expressed as
* its minimum and maximum corners) into a screen-space rectangle,
* returns zero if the result is empty */
bool paint_convert_bb_to_rect(rcti *rect,
const float bb_min[3],
const float bb_max[3],
const ARegion *ar,
RegionView3D *rv3d,
Object *ob)
{
float projection_mat[4][4];
int i, j, k;
BLI_rcti_init_minmax(rect);
/* return zero if the bounding box has non-positive volume */
if (bb_min[0] > bb_max[0] || bb_min[1] > bb_max[1] || bb_min[2] > bb_max[2])
return 0;
ED_view3d_ob_project_mat_get(rv3d, ob, projection_mat);
for (i = 0; i < 2; ++i) {
for (j = 0; j < 2; ++j) {
for (k = 0; k < 2; ++k) {
float vec[3], proj[2];
int proj_i[2];
vec[0] = i ? bb_min[0] : bb_max[0];
vec[1] = j ? bb_min[1] : bb_max[1];
vec[2] = k ? bb_min[2] : bb_max[2];
/* convert corner to screen space */
ED_view3d_project_float_v2_m4(ar, vec, proj, projection_mat);
/* expand 2D rectangle */
/* we could project directly to int? */
proj_i[0] = proj[0];
proj_i[1] = proj[1];
BLI_rcti_do_minmax_v(rect, proj_i);
}
}
}
/* return false if the rectangle has non-positive area */
return rect->xmin < rect->xmax && rect->ymin < rect->ymax;
}
