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85 lines
2.7 KiB
C++
85 lines
2.7 KiB
C++
/**********************************************************************
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* File: mod128.h (Formerly dir128.h)
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* Description: Header for class which implements modulo arithmetic.
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* Author: Ray Smith
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* Created: Tue Mar 26 17:48:13 GMT 1991
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*
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* (C) Copyright 1991, Hewlett-Packard Ltd.
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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 MOD128_H
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#define MOD128_H
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#include "points.h"
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#define MODULUS 128 /*range of directions */
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#define DIRBITS 7 //no of bits used
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#define DIRSCALE 1000 //length of vector
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class DLLSYM DIR128
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{
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public:
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DIR128() {
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} //empty constructor
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DIR128( //constructor
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inT16 value) { //value to assign
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value %= MODULUS; //modulo arithmetic
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if (value < 0)
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value += MODULUS; //done properly
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dir = (inT8) value;
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}
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DIR128(const FCOORD fc); //quantize vector
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DIR128 & operator= ( //assign of inT16
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inT16 value) { //value to assign
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value %= MODULUS; //modulo arithmetic
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if (value < 0)
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value += MODULUS; //done properly
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dir = (inT8) value;
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return *this;
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}
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inT8 operator- ( //subtraction
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const DIR128 & minus) const//for signed result
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{
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//result
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inT16 result = dir - minus.dir;
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if (result > MODULUS / 2)
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result -= MODULUS; //get in range
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else if (result < -MODULUS / 2)
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result += MODULUS;
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return (inT8) result;
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}
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DIR128 operator+ ( //addition
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const DIR128 & add) const //of itself
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{
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DIR128 result; //sum
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result = dir + add.dir; //let = do the work
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return result;
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}
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DIR128 & operator+= ( //same as +
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const DIR128 & add) {
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*this = dir + add.dir; //let = do the work
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return *this;
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}
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inT8 get_dir() const { //access function
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return dir;
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}
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private:
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inT8 dir; //a direction
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};
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#endif
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