235f56a92f
add quartic solution for intersecting quadratics git-svn-id: http://skia.googlecode.com/svn/trunk@5541 2bbb7eff-a529-9590-31e7-b0007b416f81
24 lines
830 B
C
24 lines
830 B
C
/*
|
|
* Copyright 2012 Google Inc.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
#if !defined CUBIC_UTILITIES_H
|
|
#define CUBIC_UTILITIES_H
|
|
|
|
#include "DataTypes.h"
|
|
|
|
double cube_root(double x);
|
|
void coefficients(const double* cubic, double& A, double& B, double& C, double& D);
|
|
int cubicRoots(double A, double B, double C, double D, double t[3]);
|
|
double derivativeAtT(const double* cubic, double t);
|
|
// competing version that should produce same results
|
|
double derivativeAtT_2(const double* cubic, double t);
|
|
void dxdy_at_t(const Cubic& , double t, double& x, double& y);
|
|
bool rotate(const Cubic& cubic, int zero, int index, Cubic& rotPath);
|
|
double secondDerivativeAtT(const double* cubic, double t);
|
|
void xy_at_t(const Cubic& , double t, double& x, double& y);
|
|
|
|
#endif
|