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62 lines
2.3 KiB
C++
62 lines
2.3 KiB
C++
/******************************************************************************
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** Filename: fpoint.c
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** Purpose: Abstract data type for a 2D point (floating point coords)
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** Author: Dan Johnson
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** History: Thu Apr 12 10:44:15 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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/*----------------------------------------------------------------------------
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Include Files and Type Defines
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----------------------------------------------------------------------------*/
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#include "const.h"
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#include "fpoint.h"
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#include <stdio.h>
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#include <math.h>
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/*----------------------------------------------------------------------------
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Public Code
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----------------------------------------------------------------------------*/
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FLOAT32 DistanceBetween(FPOINT A, FPOINT B) {
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double xd = XDelta(A, B);
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double yd = YDelta(A, B);
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return sqrt(static_cast<double>(xd * xd + yd * yd));
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}
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/**
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* Return the angle from Point1 to Point2 normalized to
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* lie in the range 0 to FullScale (where FullScale corresponds
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* to 2*pi or 360 degrees).
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* @param Point1 points to compute angle between
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* @param Point2 points to compute angle between
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* @param FullScale value to associate with 2*pi
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* @return none
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* @note Globals: none
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* @note Exceptions: none
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* @note History: Wed Mar 28 14:27:25 1990, DSJ, Created.
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*/
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FLOAT32 NormalizedAngleFrom(FPOINT *Point1,
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FPOINT *Point2,
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FLOAT32 FullScale) {
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FLOAT32 Angle;
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FLOAT32 NumRadsInCircle = 2.0 * PI;
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Angle = AngleFrom (*Point1, *Point2);
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if (Angle < 0.0)
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Angle += NumRadsInCircle;
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Angle *= FullScale / NumRadsInCircle;
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if (Angle < 0.0 || Angle >= FullScale)
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Angle = 0.0;
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return (Angle);
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}
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