CurveIntersection.h revision c682590538a27d73489bc91c098e000fdfb07ccf 
1#include "DataTypes.h"
2
3class Intersections;
4
5// unit-testable utilities
6bool bezier_clip(const Cubic& cubic1, const Cubic& cubic2, double& minT, double& maxT);
7bool bezier_clip(const Quadratic& q1, const Quadratic& q2, double& minT, double& maxT);
8void chop_at(const Cubic& src, CubicPair& dst, double t);
9void chop_at(const Quadratic& src, QuadraticPair& dst, double t);
10int convex_hull(const Cubic& cubic, char order[4]);
11bool convex_x_hull(const Cubic& cubic, char connectTo0[2], char connectTo3[2]);
12bool implicit_matches(const Cubic& cubic1, const Cubic& cubic2);
13bool implicit_matches(const _Line& line1, const _Line& line2);
14bool implicit_matches(const Quadratic& quad1, const Quadratic& quad2);
15void sub_divide(const Cubic& src, double t1, double t2, Cubic& dst);
16void sub_divide(const _Line& src, double t1, double t2, Cubic& dst);
17void sub_divide(const Quadratic& src, double t1, double t2, Quadratic& dst);
18void tangent(const Cubic& cubic, double t, _Point& result);
19void tangent(const _Line& line, _Point& result);
20void tangent(const Quadratic& quad, double t, _Point& result);
21
22// main functions
23enum ReduceOrder_Flags {
24    kReduceOrder_NoQuadraticsAllowed,
25    kReduceOrder_QuadraticsAllowed
26};
27int reduceOrder(const Cubic& cubic, Cubic& reduction, ReduceOrder_Flags );
28int reduceOrder(const _Line& line, _Line& reduction);
29int reduceOrder(const Quadratic& quad, Quadratic& reduction);
30int horizontalIntersect(const Cubic& cubic, double y, double tRange[3]);
31bool intersect(const Cubic& cubic1, const Cubic& cubic2, Intersections& );
32int intersect(const Cubic& cubic, const _Line& line, double cRange[3], double lRange[3]);
33bool intersect(const Quadratic& q1, const Quadratic& q2, Intersections& );
34bool intersect(const Quadratic& quad, const _Line& line, Intersections& );
35