62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
#ifndef GEOMETRY_H_
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#define GEOMETRY_H_
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#include <glib.h>
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#define EDGE_NONE 0
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#define EDGE_LEFT (1<<0)
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#define EDGE_RIGHT (1<<1)
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#define EDGE_TOP (1<<2)
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#define EDGE_BOTTOM (1<<3)
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#define EDGE_ALL (EDGE_LEFT|EDGE_RIGHT|EDGE_TOP|EDGE_BOTTOM)
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#define INTERSECTION_ERROR -1
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#define INTERSECTION_NONE 0
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#define INTERSECTION_IDENTICAL 1
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#define INTERSECTION_LINE 2
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#define INTERSECTION_LINE_LINE 2
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#define INTERSECTION_LINE_SEGMENT 3
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#define INTERSECTION_SEGMENT_LINE 6
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#define INTERSECTION_SEGMENT_SEGMENT 7
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typedef struct _VERTEX {
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double x, y;
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} VERTEX;
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typedef struct _RECTANGLE {
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double x, y, width, height;
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} RECTANGLE;
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typedef struct _LINE {
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VERTEX v1, v2;
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} LINE;
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typedef struct _VERTEX_LIST {
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unsigned int nVertices;
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VERTEX *vertices;
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} VERTEX_LIST, POLYGON;
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void addVertex(VERTEX_LIST *list, const VERTEX *v);
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void insertVertex(VERTEX_LIST *list, const VERTEX *v, unsigned int n);
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void deleteVertex(VERTEX_LIST *list, unsigned int n);
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double vertexDistanceSquare(const VERTEX *v1, const VERTEX *v2);
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double vertexDistance(const VERTEX *v1, const VERTEX *v2);
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int vertexOnLine(const VERTEX *v, const LINE *l);
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int vertexInRect(const VERTEX *v, const RECTANGLE *rect);
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gboolean vertexInPolygon(const VERTEX *v, const POLYGON *p);
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double polygonPerimeter(const POLYGON *p);
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double polygonArea(const POLYGON *p);
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int lineIntersection(const LINE *la, const LINE *lb, VERTEX *v);
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int lineRectIntersection(const LINE *l, const RECTANGLE *rect, int edge, VERTEX *v);
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int lineRectIntersections(const LINE *line, const RECTANGLE *rect, int edge, VERTEX *v1, VERTEX *v2);
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gboolean linePolygonIntersection(const LINE *l, const POLYGON *p);
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void simplifyPolygon(const POLYGON *in, const RECTANGLE *rect, POLYGON *out);
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#endif /*GEOMETRY_H_*/
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