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gds-render
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bounding box functions added

This commit is contained in:
Mario Hüttel 2018-07-27 21:08:45 +02:00
parent d4517aa493
commit 74783f312a
2 changed files with 25 additions and 0 deletions
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23
trigonometric/bounding-box.c
View File

@ -56,3 +56,26 @@ void bounding_box_calculate_polygon(GList *vertices, conv_generic_to_vector_2d_t
box->vectors.upper_right.x = xmax;
box->vectors.upper_right.y = ymax;
}
void bounding_box_update_box(union bounding_box *destination, union bounding_box *update)
{
if (!destination || !update)
return;
destination->vectors.lower_left.x = MIN(destination->vectors.lower_left.x,
update->vectors.lower_left.x);
destination->vectors.lower_left.y = MIN(destination->vectors.lower_left.y,
update->vectors.lower_left.y);
destination->vectors.upper_right.x = MAX(destination->vectors.upper_right.x,
update->vectors.upper_right.x);
destination->vectors.upper_right.y = MAX(destination->vectors.upper_right.y,
update->vectors.upper_right.y);
}
void bounding_box_prepare_empty(union bounding_box *box)
{
box->vectors.lower_left.x = DBL_MAX;
box->vectors.lower_left.y = DBL_MAX;
box->vectors.upper_right.x = DBL_MIN;
box->vectors.upper_right.y = DBL_MIN;
}

2
trigonometric/bounding-box.h
View File

@ -39,5 +39,7 @@ union bounding_box {
typedef void (*conv_generic_to_vector_2d_t)(void *, struct vector_2d *);
void bounding_box_calculate_polygon(GList *vertices, conv_generic_to_vector_2d_t conv_func, union bounding_box *box);
void bounding_box_update_box(union bounding_box *destination, union bounding_box *update);
void bounding_box_prepare_empty(union bounding_box *box);
#endif /* _BOUNDING_BOX_H_ */