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92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
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/* -*-C-*-
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********************************************************************************
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*
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* File: vecfuncs.h (Formerly vecfuncs.h)
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* Description: Vector calculations
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* Author: Mark Seaman, OCR Technology
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* Created: Wed Dec 20 09:37:18 1989
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* Modified: Tue Jul 9 17:44:37 1991 (Mark Seaman) marks@hpgrlt
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* Language: C
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* Package: N/A
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* Status: Experimental (Do Not Distribute)
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*
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* (c) Copyright 1989, Hewlett-Packard Company.
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*
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*********************************************************************************/
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#ifndef VECFUNCS_H
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#define VECFUNCS_H
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#include "tessclas.h"
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#include <math.h>
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/*----------------------------------------------------------------------
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M a c r o s
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----------------------------------------------------------------------*/
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/**********************************************************************
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* point_diff
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*
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* Return the difference from point (p1) to point (p2). Put the value
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* into point (p).
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**********************************************************************/
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#define point_diff(p,p1,p2) \
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((p).x = (p1).x - (p2).x, \
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(p).y = (p1).y - (p2).y, \
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(p))
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/**********************************************************************
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* CROSS
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*
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* cross product
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**********************************************************************/
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#define CROSS(a,b) \
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((a).x * (b).y - (a).y * (b).x)
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/**********************************************************************
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* SCALAR
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*
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* scalar vector product
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**********************************************************************/
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#define SCALAR(a,b) \
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((a).x * (b).x + (a).y * (b).y)
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/**********************************************************************
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* LENGTH
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*
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* length of vector
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**********************************************************************/
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#define LENGTH(a) \
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((a).x * (a).x + (a).y * (a).y)
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/*----------------------------------------------------------------------
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F u n c t i o n s
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----------------------------------------------------------------------*/
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int direction(EDGEPT *point);
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/*
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#if defined(__STDC__) || defined(__cplusplus) || MAC_OR_DOS
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# define _ARGS(s) s
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#else
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# define _ARGS(s) ()
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#endif*/
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/* vecfuncs.c
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int direction
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_ARGS((EDGEPT *point));
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#undef _ARGS
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*/
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#endif
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