diff options
author | chai <chaifix@163.com> | 2019-03-19 23:06:27 +0800 |
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committer | chai <chaifix@163.com> | 2019-03-19 23:06:27 +0800 |
commit | 1497dccd63a84b7ee2b229b1ad9c5c02718f2a78 (patch) | |
tree | f8d1bff50da13e126d08c7345653e002e293202d /Source/3rdParty/Box2D/Collision/Shapes/b2CircleShape.cpp | |
parent | 5e2a973516e0729b225da9de0b03015dc5854ac4 (diff) |
*rename
Diffstat (limited to 'Source/3rdParty/Box2D/Collision/Shapes/b2CircleShape.cpp')
-rw-r--r-- | Source/3rdParty/Box2D/Collision/Shapes/b2CircleShape.cpp | 99 |
1 files changed, 0 insertions, 99 deletions
diff --git a/Source/3rdParty/Box2D/Collision/Shapes/b2CircleShape.cpp b/Source/3rdParty/Box2D/Collision/Shapes/b2CircleShape.cpp deleted file mode 100644 index fa24dc8..0000000 --- a/Source/3rdParty/Box2D/Collision/Shapes/b2CircleShape.cpp +++ /dev/null @@ -1,99 +0,0 @@ -/* -* Copyright (c) 2006-2009 Erin Catto http://www.box2d.org -* -* This software is provided 'as-is', without any express or implied -* warranty. In no event will the authors be held liable for any damages -* arising from the use of this software. -* Permission is granted to anyone to use this software for any purpose, -* including commercial applications, and to alter it and redistribute it -* freely, subject to the following restrictions: -* 1. The origin of this software must not be misrepresented; you must not -* claim that you wrote the original software. If you use this software -* in a product, an acknowledgment in the product documentation would be -* appreciated but is not required. -* 2. Altered source versions must be plainly marked as such, and must not be -* misrepresented as being the original software. -* 3. This notice may not be removed or altered from any source distribution. -*/ - -#include "Box2D/Collision/Shapes/b2CircleShape.h" -#include <new> - -b2Shape* b2CircleShape::Clone(b2BlockAllocator* allocator) const -{ - void* mem = allocator->Allocate(sizeof(b2CircleShape)); - b2CircleShape* clone = new (mem) b2CircleShape; - *clone = *this; - return clone; -} - -int32 b2CircleShape::GetChildCount() const -{ - return 1; -} - -bool b2CircleShape::TestPoint(const b2Transform& transform, const b2Vec2& p) const -{ - b2Vec2 center = transform.p + b2Mul(transform.q, m_p); - b2Vec2 d = p - center; - return b2Dot(d, d) <= m_radius * m_radius; -} - -// Collision Detection in Interactive 3D Environments by Gino van den Bergen -// From Section 3.1.2 -// x = s + a * r -// norm(x) = radius -bool b2CircleShape::RayCast(b2RayCastOutput* output, const b2RayCastInput& input, - const b2Transform& transform, int32 childIndex) const -{ - B2_NOT_USED(childIndex); - - b2Vec2 position = transform.p + b2Mul(transform.q, m_p); - b2Vec2 s = input.p1 - position; - float32 b = b2Dot(s, s) - m_radius * m_radius; - - // Solve quadratic equation. - b2Vec2 r = input.p2 - input.p1; - float32 c = b2Dot(s, r); - float32 rr = b2Dot(r, r); - float32 sigma = c * c - rr * b; - - // Check for negative discriminant and short segment. - if (sigma < 0.0f || rr < b2_epsilon) - { - return false; - } - - // Find the point of intersection of the line with the circle. - float32 a = -(c + b2Sqrt(sigma)); - - // Is the intersection point on the segment? - if (0.0f <= a && a <= input.maxFraction * rr) - { - a /= rr; - output->fraction = a; - output->normal = s + a * r; - output->normal.Normalize(); - return true; - } - - return false; -} - -void b2CircleShape::ComputeAABB(b2AABB* aabb, const b2Transform& transform, int32 childIndex) const -{ - B2_NOT_USED(childIndex); - - b2Vec2 p = transform.p + b2Mul(transform.q, m_p); - aabb->lowerBound.Set(p.x - m_radius, p.y - m_radius); - aabb->upperBound.Set(p.x + m_radius, p.y + m_radius); -} - -void b2CircleShape::ComputeMass(b2MassData* massData, float32 density) const -{ - massData->mass = density * b2_pi * m_radius * m_radius; - massData->center = m_p; - - // inertia about the local origin - massData->I = massData->mass * (0.5f * m_radius * m_radius + b2Dot(m_p, m_p)); -} |