/* mesh.h
 * by Francois Labelle (flab@cs.berkeley.edu)
 * December 3, 1999  */

/* type for real numbers, uncomment exactly ONE of the following */
//typedef float real;
typedef double real;

struct EllipticityTensor {
    real ix, iy;    // where the i-vector (x-axis) maps
    real jx, jy;    // where the j-vector (y-axis) maps
};

/* prototypes of functions found in transform.c */
void T_hstretch(struct EllipticityTensor *T, real x, real y, real nx, real ny);
void T_vstretch(struct EllipticityTensor *T, real x, real y, real nx, real ny);
void T_dstretch(struct EllipticityTensor *T, real x, real y, real nx, real ny);
void T_sink(struct EllipticityTensor *T, real x, real y, real nx, real ny);
void T_swirl(struct EllipticityTensor *T, real x, real y, real nx, real ny);
void T_hline(struct EllipticityTensor *T, real x, real y, real nx, real ny);
void T_vline(struct EllipticityTensor *T, real x, real y, real nx, real ny);
void T_dline(struct EllipticityTensor *T, real x, real y, real nx, real ny);
void T_center(struct EllipticityTensor *T, real x, real y, real nx, real ny);
void T_perimeter(struct EllipticityTensor *T, real x, real y, real nx, real ny);
void T_left(struct EllipticityTensor *T, real x, real y, real nx, real ny);
void T_right(struct EllipticityTensor *T, real x, real y, real nx, real ny);
void T_top(struct EllipticityTensor *T, real x, real y, real nx, real ny);
void T_bottom(struct EllipticityTensor *T, real x, real y, real nx, real ny);
void T_custom(struct EllipticityTensor *T, real x, real y, real nx, real ny);