//New 已测
/// <summary>
/// 检测点是否在矩形中
/// </summary>
/// <param name="sCenter"></param>
/// <param name="sDir"></param>
/// <param name="nHalfWidth"></param>
/// <param name="nHalfHeight"></param>
/// <param name="sPos"></param>
/// <returns></returns>
public static bool CheckRectangleAndPos(TSVector2 sCenter, TSVector2 sDir, FP nHalfWidth, FP nHalfHeight, TSVector2 sPos)
{
//推导链接:http://jingyan.baidu.com/article/2c8c281dfbf3dd0009252a7b.html
//假设对图片上任意点(x,y)，绕一个坐标点(cx,cy)逆时针旋转a角度后的新的坐标设为(x0, y0)，有公式：
//x0= (x - cx)*cos(a) - (y - cy)*sin(a) + cx ;
//y0= (x - cx)*sin(a) + (y - cy)*cos(a) + cy ;
//注意，当sDir与x轴大于180度的时候计算的是逆时针旋转的角度，小于180顺时针
FP nAngle = TSVector2.Angle(sDir, TSVector2.up);
if (sDir.x < 0)
{
//当计算的角度是顺时针角度需要转换为逆时针角度
nAngle = 360 - nAngle;
}
FP angle = nAngle * FP.Deg2Rad;
FP nCos = TSMath.Cos(angle);
FP nSin = TSMath.Sin(angle);
FP deltaX = sPos.x - sCenter.x;
FP deltaY = sPos.y - sCenter.y;
FP nNewX = deltaX * nCos - deltaY * nSin + sCenter.x;
FP nNewY = deltaX * nSin + deltaY * nCos + sCenter.y;
sPos.x = nNewX;
sPos.y = nNewY;
return(CheckAabbAndPos(sCenter, nHalfWidth, nHalfHeight, sPos));
}
//New 已测
/// <summary>
/// 检查矩形是否和线段相交
/// </summary>
/// <param name="sCenter"></param>
/// <param name="sDir"></param>
/// <param name="nHalfWidth"></param>
/// <param name="nHalfHeight"></param>
/// <param name="sOrgPos"></param>
/// <param name="sOffset"></param>
/// <returns></returns>
public static bool CheckRectangleAndLine(TSVector2 sCenter, TSVector2 sDir, FP nHalfWidth, FP nHalfHeight, TSVector2 sOrgPos, ref TSVector2 sOffset)
{
FP nAngle = TSVector2.Angle(sDir, TSVector2.up);
if (sDir.x < 0)
{
nAngle = 360 - nAngle;
}
TSVector2 sEndPos = sOrgPos + sOffset;
FP angle = nAngle * FP.Deg2Rad;
FP nCos = TSMath.Cos(angle);
FP nSin = TSMath.Sin(angle);
FP deltaX = sOrgPos.x - sCenter.x;
FP deltaY = sOrgPos.y - sCenter.y;
FP nNewX = deltaX * nCos - deltaY * nSin + sCenter.x;
FP nNewY = deltaX * nSin + deltaY * nCos + sCenter.y;
sOrgPos.x = nNewX;
sOrgPos.y = nNewY;
deltaX = sEndPos.x - sCenter.x;
deltaY = sEndPos.y - sCenter.y;
nNewX = deltaX * nCos - deltaY * nSin + sCenter.x;
nNewY = deltaX * nSin + deltaY * nCos + sCenter.y;
sEndPos.x = nNewX;
sEndPos.y = nNewY;
TSVector2 sNewDirection = sEndPos - sOrgPos;
FP nDis = sOffset.magnitude;
nDis = CheckAabbAndLine(sCenter, nHalfWidth, nHalfHeight, sOrgPos, sNewDirection, nDis);
if (nDis < 0)
{
return(false);
}
else
{
sOffset = sOffset.normalized * nDis;
return(true);
}
}
