/// <summary>
/// 判断线是否位于矩形盒内（框选是否选中线）
/// </summary>
/// <param name="line"></param>
/// <param name="rect"></param>
/// <returns></returns>
static public bool IsRectInterPolyline(PolyLine line, RectangleD rect)
{
//先对外包矩形判断
if (IsMBRInterRect(line.MBR, rect) == false)
{
return(false);
}
//其他
int sCount = line.Count;
for (int i = 1; i < sCount; i++)
{
if (IsLineInterRect(line.GetPoint(i - 1), line.GetPoint(i), rect))
{
return(true);
}
}
return(false);
}
/// <summary>
/// 判断点是否在Polyline上（点选是否选中线）
/// </summary>
/// <param name="point"></param>
/// <param name="polyline"></param>
/// <param name="tolerance">阈值，地理距离</param>
/// <returns></returns>
static public bool IsPointOnPolyline(PointD point, PolyLine polyline, double tolerance)
{
//先将点与外包矩形对比
if (IsPointInRect(point, polyline.MBR) == false)
{
return(false);
}
//对每条线段求最近距离，并进行比较
int sCount = polyline.Count;
for (int i = 0; i < sCount - 1; i++)
{
double sDis = DistanceOfPointToSegment(polyline.GetPoint(i), polyline.GetPoint(i + 1), point);
if (sDis <= tolerance)
{
return(true);
}
}
return(false);
}
public GameObject blocksPile; //a reference to the most recently created bundle of blocks
public GameObject GenerateBlocks()
{
blocksPile = new GameObject();
blocksPile.transform.SetParent(transform);
//number this pile appropriately if there are already some piles on it
int m = 0;
for (int n = 0; n < transform.childCount; n++)
{
if (transform.GetChild(n).name.Contains("pile"))
{
m++;
}
}
blocksPile.name = "pile " + (m + 1);
//convert the spline into a polyLine
PolyLine polyLine = spline.GetPolyLine(polyLineResolution);
//spawn the blocks
for (int i = 0; i < blockCount; i++)
{
//get the fraction along the polyline to start at
float t = (float)i / (blockCount - 1);
if (endPadding != 0)
{
t = Pad(t);
}
//get the position that is along the polyline
Vector3 point = polyLine.GetPoint(t);
Quaternion orientation;
if (rotateToCurve)
{
Vector3 dir = polyLine.GetDirection(t).Flatten();
orientation = Quaternion.LookRotation(dir, Vector3.up);
}
else
{
orientation = Quaternion.identity;
}
GameObject go = Instantiate(blockPrefab, point, orientation, blocksPile.transform);
go.name = "block " + i;
}
return(blocksPile);
}