Kayne Ruse
81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
/* Copyright: (c) Kayne Ruse 2013-2015
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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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#ifndef BOUNDINGBOX_HPP_
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#define BOUNDINGBOX_HPP_
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#include "vector2.hpp"
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#include <type_traits>
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#include <algorithm>
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class BoundingBox {
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public:
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//This is explicitly a POD
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int x, y;
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int w, h;
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BoundingBox() = default;
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BoundingBox(int i, int j, int k, int l): x(i), y(j), w(k), h(l) {};
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~BoundingBox() = default;
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BoundingBox& operator=(BoundingBox const&) = default;
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int Size() {
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return (w-x) * (h-y);
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}
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bool CheckCollision(BoundingBox rhs) {
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return !(
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x >= rhs.x + rhs.w ||
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y >= rhs.y + rhs.h ||
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rhs.x >= x + w ||
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rhs.y >= y + h);
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}
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Vector2 CalcShift(BoundingBox rhs) {
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if (!CheckCollision(rhs)) {
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return {0, 0};
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}
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//DOCS: Given two BoundingBox objects, how does the other have to move so that they are no longer colliding?
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Vector2 horizontal = {0, 0};
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Vector2 vertical = {0, 0};
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horizontal.x = std::abs(x + w - rhs.x) < std::abs(rhs.x + rhs.w - x) ? x + w - rhs.x -1 : -(rhs.x + rhs.w - x -1);
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vertical.y = std::abs(y + h - rhs.x) < std::abs(rhs.y + rhs.h - y) ? y + h - rhs.y -1 : -(rhs.y + rhs.h - y -1);
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return std::abs(vertical.y) < std::abs(horizontal.x) ? vertical : horizontal;
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}
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};
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//This is explicitly a POD
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static_assert(std::is_pod<BoundingBox>::value, "BoundingBox is not a POD");
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//operators
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inline BoundingBox operator+(BoundingBox b, Vector2 v) {
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return {b.x + (int)v.x, b.y + (int)v.y, b.w, b.h};
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}
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inline BoundingBox operator+(Vector2 v, BoundingBox b) {
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return b + v;
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}
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#endif
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