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149 lines
2.7 KiB
C
149 lines
2.7 KiB
C
/*
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* c2_geometry.h
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*
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* C2DGeometry Implementation
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* Created: Monday, March 30, 1998 11:51:47
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* Converted back to C99 May 2013
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*
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* Copyright (C) 1998-2023 Michel Pollet <buserror@gmail.com>
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*
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* SPDX-License-Identifier: MIT
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*/
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#ifndef __C2_GEOMETRY_H__
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#define __C2_GEOMETRY_H__
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#include <stdint.h>
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#define PMIN(x1,x2) ((x1 < x2) ? x1 : x2)
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#define PMAX(x1,x2) ((x1 > x2) ? x1 : x2)
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typedef int32_t c2_coord_t;
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enum {
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X = 0, Y,
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// L = 0, T, R, B,
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};
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//
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// a basic x,y point
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//
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typedef union c2_pt_t {
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struct {
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c2_coord_t x, y;
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};
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c2_coord_t v[2];
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} c2_pt_t;//, *c2_pt_p;
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#define c2_pt_p union c2_pt_t*
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#define C2_PT(_a, _b) (c2_pt_t){ .x = (_a), .y = (_b) }
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#define C2_PT_ZERO C2_PT(0,0)
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//
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// a basic segment, a pair of points
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//
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typedef struct c2_segment_t {
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c2_pt_t a, b;
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} c2_segment_t;//, *c2_segment_p;
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#define c2_segment_p struct c2_segment_t*
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#define C2_SEGMENT_ZERO { C2_PT_ZERO, C2_PT_ZERO }
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//
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// a rectangle defined by two points
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//
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typedef union c2_rect_t {
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struct {
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c2_pt_t tl, br;
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};
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c2_coord_t v[4];
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struct {
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c2_coord_t l,t,r,b;
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};
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} c2_rect_t;//, *c2_rect_p;
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#define c2_rect_p union c2_rect_t*
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#define C2_RECT(_l,_t,_r,_b) (c2_rect_t){ .l = _l, .t = _t, .r = _r, .b = _b }
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#define C2_RECT_WH(_l,_t,_w,_h) (c2_rect_t){ \
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.l = _l, .t = _t, .r = (_l)+(_w), .b = (_t)+(_h) }
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/* Return the squared surface of the rectangle, for area comparison sake */
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#define c2_rect_surface_squared(_r) \
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((c2_rect_width(_r)*c2_rect_width(_r))+\
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(c2_rect_height(_r)*c2_rect_height(_r)))
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#define C2_RECT_ZERO C2_RECT(0,0,0,0)
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int
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c2_rect_contains_rect(
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const c2_rect_p r1,
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const c2_rect_p r2 );
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int
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c2_rect_clip_segment(
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const c2_rect_p r,
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c2_segment_p s,
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c2_segment_p o,
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char * outEdges );
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int
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c2_rect_clip_rect(
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const c2_rect_p r,
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const c2_rect_p s,
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c2_rect_p o );
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int
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c2_rect_intersect_rect(
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const c2_rect_p s,
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const c2_rect_p r );
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enum {
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out_Left = (1 << 0),
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out_Top = (1 << 1),
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out_Right = (1 << 2),
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out_Bottom = (1 << 3),
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};
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enum {
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corner_TopLeft = out_Left,
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corner_TopRight = out_Top,
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corner_BottomRight = out_Right,
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corner_BottomLeft = out_Bottom,
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};
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uint8_t
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c2_rect_get_out_code(
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const c2_rect_p r,
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const c2_pt_p p );
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void
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c2_rect_clip_pt(
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const c2_rect_p r,
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c2_pt_p p );
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uint8_t
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c2_rect_get_next_edge(
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uint8_t inEdge,
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int inCW );
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uint8_t
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c2_rect_is_on_edge(
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const c2_rect_p r,
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const c2_pt_p p );
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int
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c2_rect_get_edge(
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const c2_rect_p r,
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uint8_t inEdge,
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c2_segment_p outEdge );
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int
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c2_rect_get_corner(
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const c2_rect_p r,
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uint8_t inCorner,
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c2_pt_p outCorner,
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int inCW );
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const char *
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c2_rect_as_str(
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const c2_rect_p r );
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#ifndef C2_GEOMETRY_INLINE_H_
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#ifndef C2_DECL
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#include "c2_geometry_inline.h"
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#endif
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#endif
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#endif
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