#include "MyFunction.h"



Vec2 ConvertMath2Screen(Vec2 _point)
{
	Vec2 resultPoint;
	Vec2 halfScrSize = { Scene::Width() / 2.0, Scene::Height() / 2.0 };
	resultPoint.x = _point.x + halfScrSize.x;
	resultPoint.y = Scene::Height() - (_point.y + halfScrSize.y);
	return resultPoint;
}

Vec2 ConvertScreen2Math(Vec2 _point)
{
	Vec2 resultPoint;
	Vec2 halfScrSize = { Scene::Width() / 2.0, Scene::Height() / 2.0 };
	resultPoint.x = _point.x - halfScrSize.x;
	resultPoint.y = Scene::Height() - _point.y - halfScrSize.y;
	return resultPoint;
}

double Degree2Radians(double _angle)
{
	return(_angle * (PI / 180.0));
}

void DrawAxis()
{
	Vec2 halfScrSize = { Scene::Width() / 2.0, Scene::Height() / 2.0 };
	Vec2 xAxisStart = { 0, halfScrSize.y };
	Vec2 xAxisEnd = { Scene::Width() , halfScrSize.y };
	Vec2 yAxisStart = { halfScrSize.x, Scene::Height() };
	Vec2 yAxisEnd = { halfScrSize.x, 0 };
	Line{ xAxisStart, xAxisEnd }.drawArrow(2, Vec2{ 5,5 }, Palette::Black);
	Line{ yAxisStart, yAxisEnd }.drawArrow(2, Vec2{ 5,5 }, Palette::Black);
}

Vec2 RotateVec(Vec2 _vec, double _angle)
{
	double theta = Degree2Radians(_angle); //ラジアン
	Vec2 res;
	res.x = _vec.x * cos(theta) - _vec.y * sin(theta);
	res.y = _vec.x * sin(theta) + _vec.y * cos(theta);

	return(res);
}

void SetEquTrianglePoint(triangle& _tri, double _length)
{
	_tri.length = _length;
	_tri.pos[1].x = -_length / 2;
	_tri.pos[1].y = 0;
	_tri.pos[2].x = _length / 2;
	_tri.pos[2].y = 0;
	_tri.pos[0].x = 0.0;
	_tri.pos[0].y = _length * sin(Degree2Radians(60));
	double bias = _length * sin(Degree2Radians(60)) * (1 / 3.0); //高さの1/3を求めてる

	for (int i = 0; i < 3; i++)
		_tri.pos[i].y -= bias;//全y座標高さの１／３下げる
}

Vec2 GetShortestPoint(triangle& _tri, Vec2 _cp)
{
	double dist[3];
	for (int i = 0; i < 3; i++)
		dist[i] = sqrt((_tri.pos[i].x - _cp.x) * (_tri.pos[i].x - _cp.x) + (_tri.pos[i].y - _cp.y) * (_tri.pos[i].y - _cp.y));
	int mini = 0;
	for (int i = 0; i < 3; i++)
	{
		if (dist[mini] > dist[i])
			mini = i;
	}
	return(_tri.pos[mini]);
}