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64 lines
2.0 KiB
C++
64 lines
2.0 KiB
C++
/**********************************************************************
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* File: quadratc.h (Formerly quadrtic.h)
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* Description: Code for the QUAD_COEFFS class.
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* Author: Ray Smith
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* Created: Tue Oct 08 17:24:40 BST 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 QUADRATC_H
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#define QUADRATC_H
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#include "points.h"
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class QUAD_COEFFS
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{
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public:
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QUAD_COEFFS() {
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} //empty constructor
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QUAD_COEFFS( //constructor
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double xsq, //coefficients
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float x,
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float constant) {
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a = xsq;
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b = x;
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c = constant;
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}
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float y( //evaluate
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float x) const { //at x
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return (float) ((a * x + b) * x + c);
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}
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void move( // reposition word
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ICOORD vec) { // by vector
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/************************************************************
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y - q = a (x - p)^2 + b (x - p) + c
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y - q = ax^2 - 2apx + ap^2 + bx - bp + c
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y = ax^2 + (b - 2ap)x + (c - bp + ap^2 + q)
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************************************************************/
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inT16 p = vec.x ();
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inT16 q = vec.y ();
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c = (float) (c - b * p + a * p * p + q);
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b = (float) (b - 2 * a * p);
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}
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double a; //x squared
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float b; //x
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float c; //constant
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private:
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};
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#endif
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