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63 lines
2.6 KiB
C
63 lines
2.6 KiB
C
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/******************************************************************************
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** Filename: fpoint.h
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** Purpose: Abstract data type for 2D points (floating point coords)
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** Author: Dan Johnson
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** History: Thu Apr 12 10:50:01 1990, DSJ, Created.
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**
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** (c) Copyright Hewlett-Packard Company, 1988.
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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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#ifndef FPOINT_H
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#define FPOINT_H
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/**----------------------------------------------------------------------------
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Include Files and Type Defines
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----------------------------------------------------------------------------**/
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#include "general.h"
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#include <stdio.h>
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#include <math.h>
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/* define data structure to hold 2D points or vectors using floating point */
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typedef struct
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{
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FLOAT32 x, y;
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} FPOINT;
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typedef FPOINT FVECTOR;
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/**----------------------------------------------------------------------------
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Macros
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----------------------------------------------------------------------------**/
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/* macros for manipulating simple point data structures */
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#define Xof(P) ( (P).x )
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#define Yof(P) ( (P).y )
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#define XofP(P) ((P)->x)
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#define YofP(P) ((P)->y)
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#define FillPoint(P,X,Y) ( Xof(P) = (X), Yof(P) = (Y) )
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#define CopyPoint(A,B) ( Xof(B) = Xof(A), Yof(B) = Yof(A) )
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/* macros for computing miscellaneous functions of 2 points */
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#define XDelta(A,B) ( Xof(B) - Xof(A) )
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#define YDelta(A,B) ( Yof(B) - Yof(A) )
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#define DistanceBetween(A,B) \
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(sqrt ((double) (XDelta(A,B) * XDelta(A,B) + YDelta(A,B) * YDelta(A,B))))
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#define SlopeFrom(A,B) ( YDelta(A,B) / XDelta(A,B) )
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#define AngleFrom(A,B) ( atan2((double) YDelta(A,B), \
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(double) XDelta(A,B) ) )
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#define XIntersectionOf(A,B,X) ( SlopeFrom(A,B) * ((X) - Xof(A)) + Yof(A))
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/*-------------------------------------------------------------------------
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Public Function Prototypes
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---------------------------------------------------------------------------*/
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FLOAT32 NormalizedAngleFrom(FPOINT *Point1, FPOINT *Point2, FLOAT32 FullScale);
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#endif
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