85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\
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* All of the functions declared in this file and *
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* defined in vector2d.c are from the SDL2 source code. *
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* They are just renamed. *
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* => https://github.com/libsdl-org/SDL *
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\* * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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#ifndef VECTOR2D_H
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#define VECTOR2D_H
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#include <gint/defs/types.h>
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/**
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* @brief Point struct.
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*
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* @param x X pos
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* @param y Y pos
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*/
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typedef struct vector2d_t {
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float x, y;
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} vector2d_t;
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/**
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* @brief Rectangle struct.
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*
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* @param x X pos
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* @param y Y pos
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* @param w Width
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* @param h Height
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*/
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typedef struct rect_t {
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float x, y;
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float w, h;
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} rect_t;
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#define EPSILON 0.000001f
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__attribute__((const)) float fabsf(float x);
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#define is_equal_to_zero(X) (fabsf(X) <= EPSILON)
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#define is_not_zero(X) (fabsf(X) > EPSILON)
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/**
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* @brief Verify if a point is in a rectangle
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*
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* @param P Vector2d
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* @param R Rectangle
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*
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* @return True if the point is in the rectangle, else false.
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*/
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#define point_in_rect(P, R) (((P)->x >= (R)->x) && ((P)->x < ((R)->x + (R)->w)) && \
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((P)->y >= (R)->y) && ((P)->y < ((R)->y + (R)->h)))
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/**
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* @brief Verify if a rectangle is empty
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*
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* @param R Rectangle
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*
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* @return True if the rectangle is empty, else false.
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*/
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#define rect_empty(R) ((!(R)) || (is_equal_to_zero((R)->w)) || (is_equal_to_zero((R)->h)))
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/**
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* @brief Verify if there is a intersction between two rectangles
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*
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* @param A Rectangle A
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* @param B Rectangle B
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*
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* @return True if there is an intersection, else false.
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*/
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bool has_intersection(const rect_t *A, const rect_t *B);
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/**
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* @brief Verify if there is an intersection between two rectangles and get the intersection rectangle.
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*
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* @param A Rectangle A
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* @param B Rectangle B
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* @param result The intersection rectangle
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*
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* @return True if there is an intersection, else false.
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*/
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bool intersect_rect(const rect_t *A, const rect_t *B, rect_t *result);
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#endif // VECTOR2D_H
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