82 lines
2.0 KiB
C++
82 lines
2.0 KiB
C++
/*
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* Copyright (c) 2016-2016 Irlan Robson http://www.irlan.net
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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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* 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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* 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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* 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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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#ifndef B3_SEWING_PATTERN_H
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#define B3_SEWING_PATTERN_H
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#include <bounce/common/math/vec2.h>
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#include <bounce/common/math/mat22.h>
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struct b3SewingPattern
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{
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u32 vertexCount;
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b3Vec2* vertices;
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};
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struct b3RectanglePattern : public b3SewingPattern
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{
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b3Vec2 rectangleVertices[4];
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b3RectanglePattern(float32 ex = 1.0f, float32 ey = 1.0f)
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{
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B3_ASSERT(ex > 0.0f);
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B3_ASSERT(ey > 0.0f);
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// R, CCW
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rectangleVertices[0].Set(ex, -ey);
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rectangleVertices[1].Set(ex, ey);
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// L, CW
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rectangleVertices[2].Set(-ex, ey);
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rectangleVertices[3].Set(-ex, -ey);
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vertexCount = 4;
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vertices = rectangleVertices;
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}
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};
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template<u32 E = 16>
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struct b3CirclePattern : public b3SewingPattern
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{
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b3Vec2 circleVertices[E];
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b3CirclePattern(b3Vec2 center = b3Vec2_zero, float32 radius = 1.0f)
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{
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float32 x = 2.0f * B3_PI / float32(E);
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float32 c = cos(x);
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float32 s = sin(x);
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b3Mat22 R;
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R.x.Set(c, s);
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R.y.Set(-s, c);
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b3Vec2 n(1.0f, 0.0f);
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circleVertices[0] = center + radius * n;
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for (u32 i = 1; i < E; ++i)
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{
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b3Vec2 ni = R * n;
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circleVertices[i] = center + radius * ni;
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n = ni;
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}
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vertexCount = E;
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vertices = circleVertices;
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}
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};
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#endif |