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/**************************************************************************
*
* Copyright 2009 VMware, Inc. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
#ifndef BEZIER_H
#define BEZIER_H
struct polygon;
struct matrix;
struct bezier {
float x1, y1;
float x2, y2;
float x3, y3;
float x4, y4;
};
#define BEZIER_DEFAULT_ERROR 0.01
/* kappa as being l of a circle with r = 1, we can emulate any
* circle of radius r by using the formula
* l = r . kappa
* More at:
* http://www.whizkidtech.redprince.net/bezier/circle/ */
#define KAPPA 0.5522847498
void bezier_init(struct bezier *bez,
float x1, float y1,
float x2, float y2,
float x3, float y3,
float x4, float y4);
struct polygon *bezier_to_polygon(struct bezier *bez);
void bezier_add_to_polygon(const struct bezier *bez,
struct polygon *poly);
float bezier_length(struct bezier *bez, float error);
void bezier_transform(struct bezier *bez,
struct matrix *mat);
int bezier_translate_by_normal(struct bezier *b,
struct bezier *curves,
int max_curves,
float normal_len,
float threshold);
void bezier_bounds(const struct bezier *bez,
float *bounds/*x/y/width/height*/);
void bezier_exact_bounds(const struct bezier *bez,
float *bounds/*x/y/width/height*/);
void bezier_start_tangent(const struct bezier *bez,
float *tangent);
void bezier_point_at_length(struct bezier *bez, float length,
float *point, float *normal);
void bezier_point_at_t(struct bezier *bez, float t,
float *point, float *normal);
#endif
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