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Update documentation and implementations of bounding box calculations. Rename functions to fit their behavior

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This commit is contained in:
Mario Hüttel
2019-11-16 15:54:56 +01:00
parent e7f0f904e8
commit 2b0e2095e6
3 changed files with 96 additions and 17 deletions
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46
geometric/bounding-box.c
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@@ -145,7 +145,7 @@ static void calculate_path_miter_points(struct vector_2d *a, struct vector_2d *b
vector_2d_subtract(m2, m2, &v_vec);
}
void bounding_box_calculate_path_box(GList *vertices, double thickness,
void bounding_box_update_with_path(GList *vertices, double thickness,
conv_generic_to_vector_2d_t conv_func, union bounding_box *box)
{
GList *vertex_iterator;
@@ -191,24 +191,40 @@ void bounding_box_update_point(union bounding_box *destination, conv_generic_to_
destination->vectors.upper_right.y = MAX(destination->vectors.upper_right.y, point.y);
}
/**
* @brief Apply transformations onto bounding box.
* @param scale Scaling factor
* @param rotation_deg Roation of bounding box around the origin in degrees (counterclockwise)
* @param flip_at_x Flip the boundig box on the x axis before rotating.
* @param box Bounding box the operations should be applied to.
*/
void bounding_box_get_all_points(struct vector_2d *points, union bounding_box *box)
{
if (!points || !box)
return;
points[0].x = box->vectors.lower_left.x;
points[0].y = box->vectors.lower_left.y;
points[1].x = box->vectors.upper_right.x;
points[1].y = box->vectors.lower_left.y;
points[2].x = box->vectors.upper_right.x;
points[2].y = box->vectors.upper_right.y;
points[3].x = box->vectors.lower_left.x;
points[3].y = box->vectors.upper_right.y;
}
void bounding_box_apply_transform(double scale, double rotation_deg, bool flip_at_x, union bounding_box *box)
{
int i;
struct vector_2d input_points[4];
/* Due to linearity, the order of the operations does not matter.
* flip must be applied before rotation as defined by the GDS format
*/
for (i = 0; i < 2; i++) {
box->vector_array[i].y *= (flip_at_x ? -1 : 1);
vector_2d_rotate(&box->vector_array[i], rotation_deg * M_PI / 180);
vector_2d_scale(&box->vector_array[i], scale);
if (!box)
return;
bounding_box_get_all_points(input_points, box);
/* Reset box */
bounding_box_prepare_empty(box);
for (i = 0; i < 4; i++) {
input_points[i].y *= (flip_at_x ? -1 : 1);
vector_2d_rotate(&input_points[i], rotation_deg * M_PI / 180.0);
vector_2d_scale(&input_points[i], scale);
bounding_box_update_point(box, NULL, &input_points[i]);
}
}

2
geometric/cell-geometrics.c
View File

@@ -63,7 +63,7 @@ static void update_box_with_gfx(union bounding_box *box, struct gds_graphics *gf
* Please be aware if paths are the outmost elements of your cell.
* You might end up with a completely wrong calculated cell size.
*/
bounding_box_calculate_path_box(gfx->vertices, gfx->width_absolute,
bounding_box_update_with_path(gfx->vertices, gfx->width_absolute,
(conv_generic_to_vector_2d_t)&convert_gds_point_to_2d_vector,
&current_box);
break;