winapi_game_framework/utils.cpp at master · guitar0322/winapi_game_framework · GitHub

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#include "stdafx.h"
#include "utils.h"

namespace HDY_UTIL
{
	float GetDistance(float x1, float y1, float x2, float y2)
	{
		float x = x2 - x1;
		float y = y2 - y1;

		return sqrtf(x * x + y * y);
	}

	template <typename T>
	T GetDistance(T a, T b) {
		return a - b;
	}
	float GetAngle(float x1, float y1, float x2, float y2)
	{
		float x = x2 - x1;
		float y = y2 - y1;

		float distance = sqrtf(x * x + y * y);

		//코싸인의 역치역을 구하자      이부분이 코싸인
		float angle = acosf(x / distance);

		//대신에 Y축 보정을 해주자
		if (y2 > y1)
		{
			angle = PI2 - angle;
			if (angle >= PI2) angle -= PI2;
		}

		return angle;
	}

	int GetCenterX(RECT rc)
	{
		return GetCenter(rc.left, rc.right);

	}
	int GetCenterY(RECT rc)
	{
		return GetCenter(rc.top, rc.bottom);
	}
	POINT GetCenter(RECT rc)
	{
		return { GetCenter(rc.left, rc.right) , GetCenter(rc.top , rc.bottom) };
	}
	POINTF GetCenterF(RECT rc)
	{
		return { (float)GetCenter(rc.left, rc.right) , (float)GetCenter(rc.top, rc.bottom) };
	}
	int GetWidth(RECT rc)
	{
		return GetDistance(rc.right, rc.left);
	}
	int GetHeight(RECT rc)
	{
		return GetDistance(rc.bottom, rc.top);
	}
	int GetRadius(ELLIPSE ep)
	{
		return GetDistance(ep.right, ep.left) / 2;
	}
	POINTF GetCollisionPoint(RECT rc1, RECT rc2)
	{
		float angle;
		POINTF center1 = GetCenterF(rc1);
		POINTF center2 = GetCenterF(rc2);
		angle = GetAngle(center1.x, center1.y, center2.x, center2.y);

		return { center1.x + cosf(angle) * (float)GetRadius(rc1), center1.y - sinf(angle) * (float)GetRadius(rc1) };
	}
	POINTF MoveTowardTo(float x1, float y1, float x2, float y2, float speed, int limit)
	{
		float angle = GetAngle(x1, y1, x2, y2);
		float nextX, nextY;
		float distance;
		distance = GetDistance(x1, y1, x2, y2);
		float remain = distance - limit;
		if (remain > speed) {
			nextX = x1 + cosf(angle) * speed;
			nextY = y1 - sinf(angle) * speed;
		}
		else {
			nextX = x1 + cosf(angle) * remain;
			nextY = y1 - sinf(angle) * remain;
		}
		return { nextX, nextY };
	}
	POINTF MoveTowardTo(RECT& rc1, RECT& rc2, float speed, int limit)
	{
		POINTF center1 = GetCenterF(rc1);
		POINTF center2 = GetCenterF(rc2);
		float angle = GetAngle(center1.x, center1.y, center2.x, center2.y);
		float distance = GetDistance(center1.x, center1.y, center2.x, center2.y);
		float nextX, nextY;
		float remain = distance - limit;
		if (remain > speed) {
			nextX = center1.x + cosf(angle) * speed;
			nextY = center1.y - sinf(angle) * speed;
		}
		else {
			nextX = center1.x + cosf(angle) * remain;
			nextY = center1.y - sinf(angle) * remain;
		}
		rc1 = RectMakeCenter(nextX, nextY, GetWidth(rc1), GetHeight(rc1));
		return { nextX, nextY };
	}
	template<typename T>
	T GetCenter(T a, T b)
	{
		return (a + b) / 2;
	}
}