/// ------------------------------------------------ //
/// [4/18/2014 jianglei.kinly]
/// 扇形
/// ------------------------------------------------ //
xObjectSet XGameMap::CaptureObjectBySector( const XVector3& vCenter, const XVector3& vDir, xgc_uint32 dwRadius, xgc_uint16 wAngle, const std::function< xgc_bool( xObject ) > &fnFilter/* = xgc_nullptr*/ )
{
// 计算旋转向量
XVector3 vRotate = vDir.RotateZ( DEG2RAD( wAngle / 2 ) );
xgc_real32 fDotValue = vDir.DotProduct( vRotate );
auto fn = [&]( xObject hObject )->xgc_bool {
if( xgc_nullptr == fnFilter || fnFilter( hObject ) )
{
XGameObject* pObj = ObjectCast<XGameObject>( hObject );
XGC_ASSERT_RETURN( pObj, false );
XVector3 vDistance = pObj->GetPosition() - vCenter;
if( vDistance.SqurLength() > dwRadius * dwRadius * 1.0f )
return false;
if( vDir.DotProduct( vDistance ) < fDotValue )
return false;
return true;
}
return false;
};
iRect rc(
WorldToArea( vCenter.x - dwRadius, vCenter.y - dwRadius ),
WorldToArea( vCenter.x + dwRadius, vCenter.y + dwRadius ) );
return FetchObject( rc, fn );
}
/// ------------------------------------------------ //
/// [4/25/2014 jianglei.kinly]
/// 方向矩形（subCenter）
/// ------------------------------------------------ //
xObjectSet XGameMap::CaptureObjectByRectangle( const XVector3& vCenter, const XVector3& vDir, xgc_uint32 dwRadiusMax, xgc_uint32 dwRadiusMin, const std::function< xgc_bool( xObject ) > &fnFilter/* = xgc_nullptr*/ )
{
/*
0,0
-------------------------------x
|
| ------
| / /
| / /
| ---|--
| subCenter
| 斜线是dir的方向，dwRadiusMax
| 横线是dwRadiusMin
y
*/
// 取中心点坐标
XVector3 newDirect = vDir * ( dwRadiusMax * 1.0f );
XVector3 newCenter = vCenter + newDirect;
// 取对角线直径
xgc_uint32 dwDiameter = xgc_uint32( XMath::Sqrt( XMath::Pow( 1.0f * dwRadiusMax, 2.0f ) + XMath::Pow( 1.0f * dwRadiusMin, 2.0f ) ) );
auto fn = [&]( xObject hObject )->xgc_bool {
if( xgc_nullptr == fnFilter || fnFilter( hObject ) )
{
XGameObject* pObj = ObjectCast<XGameObject>( hObject );
XGC_ASSERT_RETURN( pObj, false );
// 取我和目标连线的向量
XVector3 subVec = pObj->GetPosition() - vCenter;
// 判断夹角（我的朝向点乘我和目标连线的向量 > 0 代表夹角在0-90范围内）
auto fTemp = vDir.DotProduct( subVec );
if( fTemp < 0 )
return false;
// 找两个投影，判断是否在方向矩形内
XVector3 vecy = vDir * fTemp;
XVector3 vecx = subVec - vecy;
return !( vecy.Length() > dwRadiusMax || vecx.Length() > dwRadiusMin / 2 );
}
return false;
};
iRect rc(
WorldToArea( vCenter.x - dwDiameter / 2, vCenter.y - dwDiameter / 2 ),
WorldToArea( vCenter.x + dwDiameter / 2, vCenter.y + dwDiameter / 2 ) );
return FetchObject( rc, fn );
}
