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// This is an incomplete port of http://glmatrix.net/
//
// Copyright (c) 2013 Brandon Jones, Colin MacKenzie IV
//
// 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 <mbgl/util/mat2.hpp>
#include <cmath>
namespace mbgl {
void matrix::identity(mat2& out) {
out[0] = 1.0f;
out[1] = 0.0f;
out[2] = 0.0f;
out[3] = 1.0f;
}
void matrix::rotate(mat2& out, const mat2& a, double rad) {
double a0 = a[0], a1 = a[1], a2 = a[2], a3 = a[3],
s = std::sin(rad),
c = std::cos(rad);
out[0] = a0 * c + a2 * s;
out[1] = a1 * c + a3 * s;
out[2] = a0 * -s + a2 * c;
out[3] = a1 * -s + a3 * c;
}
void matrix::scale(mat2& out, const mat2& a, double v0, double v1) {
double a0 = a[0], a1 = a[1], a2 = a[2], a3 = a[3];
out[0] = a0 * v0;
out[1] = a1 * v0;
out[2] = a2 * v1;
out[3] = a3 * v1;
}
} // namespace mbgl
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