122 lines
4.4 KiB
C
122 lines
4.4 KiB
C
/*
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* GDSII-Converter
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* Copyright (C) 2018 Mario Hüttel <mario.huettel@gmx.net>
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*
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* This file is part of GDSII-Converter.
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*
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* GDSII-Converter is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* GDSII-Converter is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GDSII-Converter. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file bounding-box.h
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* @brief Header for calculation of bounding boxes
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* @author Mario Hüttel <mario.huettel@gmx.net>
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*/
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/**
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* @addtogroup geometric
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* @{
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*/
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#ifndef _BOUNDING_BOX_H_
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#define _BOUNDING_BOX_H_
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#include <glib.h>
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#include <gds-render/geometric/vector-operations.h>
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#include <stdbool.h>
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union bounding_box {
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/** Coordinate System is (y up | x right) */
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struct _vectors {
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struct vector_2d lower_left;
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struct vector_2d upper_right;
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} vectors;
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struct vector_2d vector_array[2];
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};
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typedef void (*conv_generic_to_vector_2d_t)(void *, struct vector_2d *);
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/**
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* @brief Calculate bounding box of polygon
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* @param vertices List of vertices that describe the polygon
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* @param conv_func Conversion function to convert vertices to vector_2d structs.
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* @param box Box to write to. This box is not updated! All previous data is discarded
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*/
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void bounding_box_calculate_polygon(GList *vertices, conv_generic_to_vector_2d_t conv_func, union bounding_box *box);
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/**
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* @brief Update an exisitng bounding box with another one.
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* @param destination Target box to update
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* @param update Box to update the target with
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*/
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void bounding_box_update_box(union bounding_box *destination, union bounding_box *update);
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/**
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* @brief Prepare an empty bounding box.
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*
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* Updating this specially prepared box, results in a bounding box that is the same size as the update
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*
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* @param box Box to preapre
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*/
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void bounding_box_prepare_empty(union bounding_box *box);
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/**
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* @brief Update bounding box with a point
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* @param destination Bounding box to update
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* @param conv_func Conversion function to convert \p pt to a vector_2d. May be NULL
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* @param pt Point to update bounding box with
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*/
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void bounding_box_update_point(union bounding_box *destination, conv_generic_to_vector_2d_t conv_func, void *pt);
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/**
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* @brief Return all four corner points of a bounding box
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* @param[out] points Array of 4 vector_2d structs that has to be allocated by the caller
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* @param box Bounding box
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*/
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void bounding_box_get_all_points(struct vector_2d *points, union bounding_box *box);
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/**
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* @brief Apply transformations onto bounding box.
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*
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* All corner points \f$ \vec{P_i} \f$ of the bounding box are transformed to output points \f$ \vec{P_o} \f$ by:
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*
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* \f$ \vec{P_o} = s \cdot \begin{pmatrix}\cos\left(\phi\right) & -\sin\left(\phi\right)\\ \sin\left(\phi\right) & \cos\left(\phi\right)\end{pmatrix} \cdot \begin{pmatrix} 1 & 0 \\ 0 & -1^{m} \end{pmatrix} \cdot \vec{P_i} \f$, with:
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*
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* * \f$s\f$: Scale
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* * \f$m\f$: 1, if flipped_at_x is True, else 0
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* * \f$\phi\f$: Rotation angle in radians. The conversion degrees => radians is done internally
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*
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* The result is the bounding box generated around all output points
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*
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* @param scale Scaling factor
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* @param rotation_deg Rotation of bounding box around the origin in degrees (counterclockwise)
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* @param flip_at_x Flip the boundig box on the x axis before rotating.
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* @param box Bounding box the operations should be applied to.
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* @note Keep in mind, that this bounding boxy is actually the bounding box of the rotated boundig box and not the object itself.
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* It might be too big.
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*/
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void bounding_box_apply_transform(double scale, double rotation_deg, bool flip_at_x, union bounding_box *box);
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/**
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* @brief Calculate the bounding box of a path and update the given bounding box
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* @param vertices Vertices the path is made up of
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* @param thickness Thisckness of the path
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* @param conv_func Conversion function for vertices to vector_2d structs
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* @param box Bounding box to write results in.
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*/
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void bounding_box_update_with_path(GList *vertices, double thickness, conv_generic_to_vector_2d_t conv_func, union bounding_box *box);
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#endif /* _BOUNDING_BOX_H_ */
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/** @} */
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