Kayne Ruse
45 lines
1.3 KiB
C++
45 lines
1.3 KiB
C++
/* Copyright: (c) Kayne Ruse 2014
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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*
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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*
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* 3. This notice may not be removed or altered from any source
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* distribution.
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*/
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#include "maths.hpp"
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double curve(double x) {
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return 3.0 * pow(x, 2.0) - 2.0 * pow(x, 3.0);
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}
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double snap(double x, double base) {
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//snap to a grid (floating point version)
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return floor(x / base) * base;
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}
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int snap(int x, int base) {
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//snap to a grid (integer devision version)
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if (x < 0) {
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++x;
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return x / base * base - base;
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}
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return x / base * base;
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}
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double scalarProduct(Vector2 lhs, Vector2 rhs) {
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//the dot product
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return lhs.x * rhs.x + lhs.y * rhs.y;
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} |