#include <stdio.h>
#include <math.h>
#include <vector>
int main()
{
	//思路就是圍繞這個座標為圓心，產生不同半徑的圓，然後在取這個圓上，不同角度或方向的點即可
	typedef struct tagPoint
	{
		float x;
		float y;
	} Point;

	//圓心座標,根據自己需求修改
	const Point CycPoint = { .0f, .0f };
	
	//產生圓心座標向外的隨機點半徑範圍50 - 100單位，根據自己需求修改
	const int RadiusArea[] = { 50, 100 };

	//當前半徑
	float CurrentR = .0f;

	//當前角度或方向
	float CurrentAngle = .0f;
	//隨機點個數
	const int count = 20;
	
	//儲存隨機點
	std::vector< Point > randomPoint;

	//圓周率
	const float pi = 3.1415926f;

	Point tmp;
	for( int i = 0; i < count; ++i )
	{
		//隨機半徑50 - 100範圍內
		CurrentR = RadiusArea[ 0 ] + ( rand() % ( RadiusArea[ 1 ] - RadiusArea[ 0 ] ) ) + 1;
		//隨機方向 0 - 360度
		CurrentAngle = rand() % 361;
		tmp.x = sin(  CurrentAngle * pi / 180  ) * CurrentR;
		tmp.y = cos(  CurrentAngle * pi / 180) * CurrentR;
		randomPoint.push_back( tmp );
	}

	for( int i = 0; i < randomPoint.size(); ++i )
	{
		const Point& p = randomPoint[ i ];
		printf( "x:%f y%f\n", CycPoint.x + p.x, CycPoint.y + p.y );
	}
	return 0;
}