From 1fd361a1ea06e44286c213ca1f814f49306fdc43 Mon Sep 17 00:00:00 2001 From: giraffedata Date: Sat, 19 Aug 2006 03:12:28 +0000 Subject: Create Subversion repository git-svn-id: http://svn.code.sf.net/p/netpbm/code/trunk@1 9d0c8265-081b-0410-96cb-a4ca84ce46f8 --- converter/other/pamtosvg/vector.h | 71 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 converter/other/pamtosvg/vector.h (limited to 'converter/other/pamtosvg/vector.h') diff --git a/converter/other/pamtosvg/vector.h b/converter/other/pamtosvg/vector.h new file mode 100644 index 00000000..74fb2fd2 --- /dev/null +++ b/converter/other/pamtosvg/vector.h @@ -0,0 +1,71 @@ +/* vector.h: operations on vectors and points. */ + +#ifndef VECTOR_H +#define VECTOR_H + +#include "point.h" +#include "exception.h" + +/* Our vectors are represented as displacements along the x and y axes. */ + +typedef struct +{ + float dx, dy, dz; +} vector_type; + + +/* Consider a point as a vector from the origin. */ +extern vector_type make_vector (const float_coord); + +/* And a vector as a point, i.e., a displacement from the origin. */ +extern float_coord vector_to_point (const vector_type); + + +/* Definitions for these common operations can be found in any decent + linear algebra book, and most calculus books. */ + +extern float magnitude (const vector_type); +extern vector_type normalize (const vector_type); + +extern vector_type Vadd (const vector_type, const vector_type); +extern float Vdot (const vector_type, const vector_type); +extern vector_type Vmult_scalar (const vector_type, const float); +extern float Vangle (const vector_type in, const vector_type out, at_exception_type * exp); + +/* These operations could have been named `P..._vector' just as well as + V..._point, so we may as well allow both names. */ +#define Padd_vector Vadd_point +extern float_coord Vadd_point + (const float_coord, const vector_type); + +#define Psubtract_vector Vsubtract_point +extern float_coord Vsubtract_point + (const float_coord, const vector_type); + +/* This returns the rounded sum. */ +#define IPadd_vector Vadd_int_point + +pm_pixelcoord +Vadd_int_point(pm_pixelcoord const c, + vector_type const v); + +/* Take the absolute value of both components. */ +extern vector_type Vabs (const vector_type); + +/* Operations on points with real coordinates. It is not orthogonal, + but more convenient, to have the subtraction operator return a + vector, and the addition operator return a point. */ +extern vector_type Psubtract + (const float_coord, const float_coord); + +vector_type +IPsubtract(pm_pixelcoord const coord1, + pm_pixelcoord const coord2); + +/* These are heavily used in spline fitting. */ +extern float_coord Padd (const float_coord, + const float_coord); +extern float_coord Pmult_scalar (const float_coord, const float); + +#endif + -- cgit 1.4.1