mirror of
https://github.com/42wim/matterbridge.git
synced 2024-12-29 14:42:39 +01:00
98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2020 Samsung Electronics Co., Ltd. All rights reserved.
|
||
|
|
|
||
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||
|
|
* of this software and associated documentation files (the "Software"), to deal
|
||
|
|
* in the Software without restriction, including without limitation the rights
|
||
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||
|
|
* copies of the Software, and to permit persons to whom the Software is
|
||
|
|
* furnished to do so, subject to the following conditions:
|
||
|
|
|
||
|
|
* The above copyright notice and this permission notice shall be included in all
|
||
|
|
* copies or substantial portions of the Software.
|
||
|
|
|
||
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||
|
|
* SOFTWARE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef VLINE_H
|
||
|
|
#define VLINE_H
|
||
|
|
|
||
|
|
#include "vector_vglobal.h"
|
||
|
|
#include "vector_vpoint.h"
|
||
|
|
|
||
|
|
V_BEGIN_NAMESPACE
|
||
|
|
|
||
|
|
class VLine {
|
||
|
|
public:
|
||
|
|
VLine() = default;
|
||
|
|
VLine(float x1, float y1, float x2, float y2)
|
||
|
|
: mX1(x1), mY1(y1), mX2(x2), mY2(y2)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
VLine(const VPointF &p1, const VPointF &p2)
|
||
|
|
: mX1(p1.x()), mY1(p1.y()), mX2(p2.x()), mY2(p2.y())
|
||
|
|
{
|
||
|
|
}
|
||
|
|
float length() const { return length(mX1, mY1, mX2, mY2);}
|
||
|
|
void splitAtLength(float length, VLine &left, VLine &right) const;
|
||
|
|
VPointF p1() const { return {mX1, mY1}; }
|
||
|
|
VPointF p2() const { return {mX2, mY2}; }
|
||
|
|
float angle() const;
|
||
|
|
static float length(float x1, float y1, float x2, float y2);
|
||
|
|
|
||
|
|
private:
|
||
|
|
float mX1{0};
|
||
|
|
float mY1{0};
|
||
|
|
float mX2{0};
|
||
|
|
float mY2{0};
|
||
|
|
};
|
||
|
|
|
||
|
|
inline float VLine::angle() const
|
||
|
|
{
|
||
|
|
static constexpr float K_PI = 3.141592f;
|
||
|
|
const float dx = mX2 - mX1;
|
||
|
|
const float dy = mY2 - mY1;
|
||
|
|
|
||
|
|
const float theta = std::atan2(dy, dx) * 180.0f / K_PI;
|
||
|
|
return theta;
|
||
|
|
}
|
||
|
|
|
||
|
|
// approximate sqrt(x*x + y*y) using alpha max plus beta min algorithm.
|
||
|
|
// With alpha = 1, beta = 3/8, giving results with the largest error less
|
||
|
|
// than 7% compared to the exact value.
|
||
|
|
inline V_ALWAYS_INLINE float VLine::length(float x1, float y1, float x2, float y2)
|
||
|
|
{
|
||
|
|
float x = x2 - x1;
|
||
|
|
float y = y2 - y1;
|
||
|
|
|
||
|
|
x = x < 0 ? -x : x;
|
||
|
|
y = y < 0 ? -y : y;
|
||
|
|
|
||
|
|
return (x > y ? x + 0.375f * y : y + 0.375f * x);
|
||
|
|
}
|
||
|
|
|
||
|
|
inline void VLine::splitAtLength(float lengthAt, VLine &left, VLine &right) const
|
||
|
|
{
|
||
|
|
float len = length();
|
||
|
|
float dx = ((mX2 - mX1) / len) * lengthAt;
|
||
|
|
float dy = ((mY2 - mY1) / len) * lengthAt;
|
||
|
|
|
||
|
|
left.mX1 = mX1;
|
||
|
|
left.mY1 = mY1;
|
||
|
|
left.mX2 = left.mX1 + dx;
|
||
|
|
left.mY2 = left.mY1 + dy;
|
||
|
|
|
||
|
|
right.mX1 = left.mX2;
|
||
|
|
right.mY1 = left.mY2;
|
||
|
|
right.mX2 = mX2;
|
||
|
|
right.mY2 = mY2;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif //VLINE_H
|