public List<int> GetIndices(ref RectangleD rect)
{
if (rootNode.Bounds.IntersectsWith(rect))
{
List<int> indices = new List<int>();
Dictionary<int, int> duplicates = new Dictionary<int, int>();
rootNode.GetIndices(ref rect, indices, duplicates);
return indices;
}
return null;
}
internal void GetIndices(ref RectangleD rect, List <int> indices, System.Collections.Generic.Dictionary <int, int> foundIndicies)
{
if (children != null)
{
//check each child bounds
if (children[TL].Bounds.IntersectsWith(rect))
{
children[TL].GetIndices(ref rect, indices, foundIndicies);
}
if (children[TR].Bounds.IntersectsWith(rect))
{
children[TR].GetIndices(ref rect, indices, foundIndicies);
}
if (children[BL].Bounds.IntersectsWith(rect))
{
children[BL].GetIndices(ref rect, indices, foundIndicies);
}
if (children[BR].Bounds.IntersectsWith(rect))
{
children[BR].GetIndices(ref rect, indices, foundIndicies);
}
}
else
{
if (indexList != null)
{
//assumes already checked node's Bounds intersect rect
//add the node'x indices, checking if it has already been added
//We need to check for duplicates as a shape may intersect more than 1 node
for (int n = indexList.Count - 1; n >= 0; --n)
{
if (!foundIndicies.ContainsKey(indexList[n]))
{
indices.Add(indexList[n]);
foundIndicies.Add(indexList[n], 0);
}
}
}
}
}
public void Insert(int recordIndex, QTNodeHelper helper, System.IO.Stream shapeFileStream)
{
if (helper.IsPointData())
{
rootNode.Insert(recordIndex, helper, shapeFileStream);
}
else
{
RectangleD recBounds = helper.GetRecordBoundsD(recordIndex, shapeFileStream);
//check for zero width or height to avoid issue when checking rectangle intersection
//if width/height is zero
if (recBounds.Width < 0.0000001)
{
recBounds.Width = 0.0000001;
}
if (recBounds.Height < 0.0000001)
{
recBounds.Height = 0.0000001;
}
rootNode.Insert(recordIndex, helper, ref recBounds, shapeFileStream);
}
}
public void Insert(int recordIndex, QTNodeHelper helper, System.IO.Stream shapeFileStream)
{
if (Level == MaxLevels)
{
indexList.Add(recordIndex);
}
else
{
if (helper.IsPointData())
{
PointD pt = helper.GetRecordPoint(recordIndex, shapeFileStream);
if (children == null)
{
CreateChildren();
}
if (children[TL].Bounds.Contains(pt))
{
children[TL].Insert(recordIndex, helper, shapeFileStream);
}
if (children[TR].Bounds.Contains(pt))
{
children[TR].Insert(recordIndex, helper, shapeFileStream);
}
if (children[BL].Bounds.Contains(pt))
{
children[BL].Insert(recordIndex, helper, shapeFileStream);
}
if (children[BR].Bounds.Contains(pt))
{
children[BR].Insert(recordIndex, helper, shapeFileStream);
}
//else
//{
// throw new InvalidOperationException("point " + pt + " is not contained in children bounds");
//}
}
else
{
RectangleD recBounds = helper.GetRecordBoundsD(recordIndex, shapeFileStream);
if (children == null)
{
CreateChildren();
}
int c = 0;
if (children[TL].Bounds.IntersectsWith(recBounds))
{
c++;
children[TL].Insert(recordIndex, helper, shapeFileStream);
}
if (children[TR].Bounds.IntersectsWith(recBounds))
{
c++;
children[TR].Insert(recordIndex, helper, shapeFileStream);
}
if (children[BL].Bounds.IntersectsWith(recBounds))
{
c++;
children[BL].Insert(recordIndex, helper, shapeFileStream);
}
if (children[BR].Bounds.IntersectsWith(recBounds))
{
c++;
children[BR].Insert(recordIndex, helper, shapeFileStream);
}
}
}
}
public static RectangleD Transform(this EGIS.Projections.ICoordinateTransformation @this, RectangleD rect, Projections.TransformDirection direction = Projections.TransformDirection.Forward)
{
//following code was derived from code in QGIS TransformBoundingBox function in QgsCoordinateTransform
//improves calculated bounding box after transforming to a different CRS when
//only using the corners of the rectangle will not give an accurate result when transforming to some CRS.
//This method creates a grid of points over the input rectangle,
//transforms these points and then calculates the target bounding box from these points.
const int nPoints = 1000;
double t = Math.Pow(Math.Sqrt((double)nPoints) - 1, 2.0);
double d = Math.Sqrt((rect.Width * rect.Height) / Math.Pow(Math.Sqrt((double)nPoints) - 1, 2.0));
int nXPoints = (int)Math.Min(Math.Ceiling(rect.Width / d) + 1, 1000);
int nYPoints = (int)Math.Min(Math.Ceiling(rect.Height / d) + 1, 1000);
int totalPoints = (nXPoints * nYPoints);
PointD[] pts = new PointD[totalPoints];
double dx = rect.Width / (double)(nXPoints - 1);
double dy = rect.Height / (double)(nYPoints - 1);
double pointY = rect.Top;
int index = 0;
for (int i = nYPoints; i > 0; --i)
{
double pointX = rect.Left;
for (int j = nXPoints; j > 0; --j)
{
pts[index].X = pointX;
pts[index++].Y = pointY;
pointX += dx;
}
pointY += dy;
}
@this.Transform(pts, direction);
double minX = double.PositiveInfinity, maxX = double.NegativeInfinity, minY = double.PositiveInfinity, maxY = double.NegativeInfinity;
for (int n = totalPoints - 1; n >= 0; --n)
{
if (double.IsInfinity(pts[n].X) || double.IsInfinity(pts[n].Y))
{
continue;
}
minX = Math.Min(pts[n].X, minX);
minY = Math.Min(pts[n].Y, minY);
maxX = Math.Max(pts[n].X, maxX);
maxY = Math.Max(pts[n].Y, maxY);
}
return(RectangleD.FromLTRB(minX, minY, maxX, maxY));
}
public static RectangleD Transform(this RectangleD @this, ICoordinateTransformation transformation)
{
return(transformation.Transform(@this));
}
static RectangleD()
{
Empty = new RectangleD();
}
/// <summary>Creates the smallest possible third rectangle that can contain both of two rectangles that form a union.</summary>
/// <returns>A third <see cref="T:System.Drawing.RectangleD"></see> structure that contains both of the two rectangles that form the union.</returns>
/// <param name="a">A rectangle to union. </param>
/// <param name="b">A rectangle to union. </param>
/// <filterpriority>1</filterpriority>
public static RectangleD Union(RectangleD a, RectangleD b)
{
double x = Math.Min(a.X, b.X);
double num2 = Math.Max((double)(a.X + a.Width), (double)(b.X + b.Width));
double y = Math.Min(a.Y, b.Y);
double num4 = Math.Max((double)(a.Y + a.Height), (double)(b.Y + b.Height));
return new RectangleD(x, y, num2 - x, num4 - y);
}
/// <summary>Determines if the rectangular region represented by rect is entirely contained within this <see cref="T:System.Drawing.RectangleD"></see> structure.</summary>
/// <returns>This method returns true if the rectangular region represented by rect is entirely contained within the rectangular region represented by this <see cref="T:System.Drawing.RectangleD"></see>; otherwise false.</returns>
/// <param name="rect">The <see cref="T:System.Drawing.RectangleD"></see> to test. </param>
/// <filterpriority>1</filterpriority>
public bool Contains(RectangleD rect)
{
return((((this.X <= rect.X) && ((rect.X + rect.Width) <= (this.X + this.Width))) && (this.Y <= rect.Y)) && ((rect.Y + rect.Height) <= (this.Y + this.Height)));
}
/// <summary>Replaces this <see cref="T:System.Drawing.RectangleD"></see> structure with the intersection of itself and the specified <see cref="T:System.Drawing.RectangleD"></see> structure.</summary>
/// <returns>This method does not return a value.</returns>
/// <param name="rect">The rectangle to intersect. </param>
/// <filterpriority>1</filterpriority>
public void Intersect(RectangleD rect)
{
RectangleD ef = Intersect(rect, this);
this.X = ef.X;
this.Y = ef.Y;
this.Width = ef.Width;
this.Height = ef.Height;
}
/// <summary>Creates and returns an inflated copy of the specified <see cref="T:System.Drawing.RectangleD"></see> structure. The copy is inflated by the specified amount. The original rectangle remains unmodified.</summary>
/// <returns>The inflated <see cref="T:System.Drawing.RectangleD"></see>.</returns>
/// <param name="rect">The <see cref="T:System.Drawing.RectangleD"></see> to be copied. This rectangle is not modified. </param>
/// <param name="y">The amount to inflate the copy of the rectangle vertically. </param>
/// <param name="x">The amount to inflate the copy of the rectangle horizontally. </param>
/// <filterpriority>1</filterpriority>
public static RectangleD Inflate(RectangleD rect, double x, double y)
{
RectangleD ef = rect;
ef.Inflate(x, y);
return ef;
}
/// <summary>Determines if the rectangular region represented by rect is entirely contained within this <see cref="T:System.Drawing.RectangleD"></see> structure.</summary>
/// <returns>This method returns true if the rectangular region represented by rect is entirely contained within the rectangular region represented by this <see cref="T:System.Drawing.RectangleD"></see>; otherwise false.</returns>
/// <param name="rect">The <see cref="T:System.Drawing.RectangleD"></see> to test. </param>
/// <filterpriority>1</filterpriority>
public bool Contains(RectangleD rect)
{
return ((((this.X <= rect.X) && ((rect.X + rect.Width) <= (this.X + this.Width))) && (this.Y <= rect.Y)) && ((rect.Y + rect.Height) <= (this.Y + this.Height)));
}
internal void GetIndices(ref RectangleD rect, List<int> indices, System.Collections.Generic.Dictionary<int, int> foundIndicies)
{
if (children != null)
{
//check each child bounds
if (children[TL].Bounds.IntersectsWith(rect))
{
children[TL].GetIndices(ref rect, indices, foundIndicies);
}
if (children[TR].Bounds.IntersectsWith(rect))
{
children[TR].GetIndices(ref rect, indices, foundIndicies);
}
if (children[BL].Bounds.IntersectsWith(rect))
{
children[BL].GetIndices(ref rect, indices, foundIndicies);
}
if (children[BR].Bounds.IntersectsWith(rect))
{
children[BR].GetIndices(ref rect, indices, foundIndicies);
}
}
else
{
if (indexList != null)
{
//assumes already checked node's Bounds intersect rect
//add the node'x indices, checking if it has already been added
//We need to check for duplicates as a shape may intersect more than 1 node
for (int n = indexList.Count - 1; n >= 0; --n)
{
if (!foundIndicies.ContainsKey(indexList[n]))
{
indices.Add(indexList[n]);
foundIndicies.Add(indexList[n], 0);
}
}
}
}
}
static RectangleD()
{
Empty = new RectangleD();
}
/// <summary>Determines if this rectangle intersects with rect.</summary>
/// <returns>This method returns true if there is any intersection.</returns>
/// <param name="rect">The rectangle to test. </param>
/// <filterpriority>1</filterpriority>
public bool IntersectsWith(RectangleD rect)
{
return((((rect.X < (this.X + this.Width)) && (this.X < (rect.X + rect.Width))) && (rect.Y < (this.Y + this.Height))) && (this.Y < (rect.Y + rect.Height)));
}
/// <summary>Returns a <see cref="T:System.Drawing.RectangleD"></see> structure that represents the intersection of two rectangles. If there is no intersection, and empty <see cref="T:System.Drawing.RectangleD"></see> is returned.</summary>
/// <returns>A third <see cref="T:System.Drawing.RectangleD"></see> structure the size of which represents the overlapped area of the two specified rectangles.</returns>
/// <param name="a">A rectangle to intersect. </param>
/// <param name="b">A rectangle to intersect. </param>
/// <filterpriority>1</filterpriority>
public static RectangleD Intersect(RectangleD a, RectangleD b)
{
double x = Math.Max(a.X, b.X);
double num2 = Math.Min((double)(a.X + a.Width), (double)(b.X + b.Width));
double y = Math.Max(a.Y, b.Y);
double num4 = Math.Min((double)(a.Y + a.Height), (double)(b.Y + b.Height));
if ((num2 >= x) && (num4 >= y))
{
return new RectangleD(x, y, num2 - x, num4 - y);
}
return Empty;
}
public QuadTree(RectangleD bounds)
{
rootNode = new QTNode(bounds, 0);
}
/// <summary>Determines if this rectangle intersects with rect.</summary>
/// <returns>This method returns true if there is any intersection.</returns>
/// <param name="rect">The rectangle to test. </param>
/// <filterpriority>1</filterpriority>
public bool IntersectsWith(RectangleD rect)
{
return ((((rect.X < (this.X + this.Width)) && (this.X < (rect.X + rect.Width))) && (rect.Y < (this.Y + this.Height))) && (this.Y < (rect.Y + rect.Height)));
}
public static RectangleD Transform(this EGIS.Projections.ICoordinateTransformation @this, RectangleD rect, Projections.TransformDirection direction = Projections.TransformDirection.Forward)
{
double[] pts = new double[8];
pts[0] = rect.Left; pts[1] = rect.Bottom;
pts[2] = rect.Right; pts[3] = rect.Bottom;
pts[4] = rect.Right; pts[5] = rect.Top;
pts[6] = rect.Left; pts[7] = rect.Top;
@this.Transform(pts, 4, direction);
return(RectangleD.FromLTRB(Math.Min(pts[0], pts[6]),
Math.Min(pts[5], pts[7]), Math.Max(pts[2], pts[4]),
Math.Max(pts[1], pts[3])));
}
/// <summary>
/// </summary>
/// <param name="r"></param>
/// <param name="centre"></param>
/// <param name="radius"></param>
/// <returns></returns>
/// <remarks>This method is untested</remarks>
public static bool RectangleCircleIntersects(ref RectangleD r, ref PointD centre, double radius)
{
//following code obtained from http://stackoverflow.com/questions/401847/circle-rectangle-collision-detection-intersection
// clamp(value, min, max) - limits value to the range min..max
// Find the closest point to the circle within the rectangle
//float closestX = clamp(circle.X, rectangle.Left, rectangle.Right);
//float closestY = clamp(circle.Y, rectangle.Top, rectangle.Bottom);
//// Calculate the distance between the circle's center and this closest point
//float distanceX = circle.X - closestX;
//float distanceY = circle.Y - closestY;
//// If the distance is less than the circle's radius, an intersection occurs
//float distanceSquared = (distanceX * distanceX) + (distanceY * distanceY);
//return distanceSquared < (circle.Radius * circle.Radius);
double closestX = Math.Max(Math.Min(centre.X, r.Right), r.Left);
double closestY = Math.Max(Math.Min(centre.Y, r.Bottom), r.Top);
// Calculate the distance between the circle's center and this closest point
double distanceX = centre.X - closestX;
double distanceY = centre.Y - closestY;
// If the distance is less than the circle's radius, an intersection occurs
return ((distanceX * distanceX) + (distanceY * distanceY)) <= (radius*radius);
}