public override IRectangle CalcBoxByDistFromPt(IPoint from, double distDEG, SpatialContext ctx, IRectangle reuse)
{
double minX = from.X - distDEG;
double maxX = from.X + distDEG;
double minY = from.Y - distDEG;
double maxY = from.Y + distDEG;
if (reuse == null)
{
return(ctx.MakeRectangle(minX, maxX, minY, maxY));
}
else
{
reuse.Reset(minX, maxX, minY, maxY);
return(reuse);
}
}
public virtual void TestSimpleRectangle(SpatialContext ctx)
{
base.ctx = ctx;
double v = 2001 * (random.NextDouble() > 0.5 ? -1 : 1);
Assert.Throws <InvalidShapeException>(() => ctx.MakeRectangle(v, 0, 0, 0));
Assert.Throws <InvalidShapeException>(() => ctx.MakeRectangle(0, v, 0, 0));
Assert.Throws <InvalidShapeException>(() => ctx.MakeRectangle(0, 0, v, 0));
Assert.Throws <InvalidShapeException>(() => ctx.MakeRectangle(0, 0, 0, v));
Assert.Throws <InvalidShapeException>(() => ctx.MakeRectangle(0, 0, 10, -10));
Assert.Throws <InvalidShapeException>(() => ctx.MakeRectangle(10, -10, 0, 0));
double[] minXs = new double[] { -1000, -360, -180, -20, 0, 20, 180, 1000 };
foreach (double minX in minXs)
{
double[] widths = new double[] { 0, 10, 180, 360, 400 };
foreach (double width in widths)
{
TestRectangle(minX, width, 0, 0);
TestRectangle(minX, width, -10, 10);
TestRectangle(minX, width, 5, 10);
}
}
IRectangle r = ctx.MakeRectangle(0, 0, 0, 0);
r.Reset(1, 2, 3, 4);
Assert.Equal(ctx.MakeRectangle(1, 2, 3, 4), r);
TestRectIntersect();
if (!ctx.IsGeo)
{
AssertEquals(ctx.MakeRectangle(0.9, 2.1, 2.9, 4.1), ctx.MakeRectangle(1, 2, 3, 4).GetBuffered(0.1, ctx));
}
TestEmptiness(ctx.MakeRectangle(double.NaN, double.NaN, double.NaN, double.NaN));
}
/// <summary>
/// Calculates the bounding box of a circle, as specified by its center point
/// and distance. <paramref name="reuse"/> is an optional argument to store the
/// results to avoid object creation.
/// </summary>
public static IRectangle CalcBoxByDistFromPtDEG(double lat, double lon, double distDEG, SpatialContext ctx, IRectangle reuse)
{
//See http://janmatuschek.de/LatitudeLongitudeBoundingCoordinates Section 3.1, 3.2 and 3.3
double minX;
double maxX;
double minY;
double maxY;
if (distDEG == 0)
{
minX = lon;
maxX = lon;
minY = lat;
maxY = lat;
}
else if (distDEG >= 180)
{
//distance is >= opposite side of the globe
minX = -180;
maxX = 180;
minY = -90;
maxY = 90;
}
else
{
//--calc latitude bounds
maxY = lat + distDEG;
minY = lat - distDEG;
if (maxY >= 90 || minY <= -90)
{
//touches either pole
//we have special logic for longitude
minX = -180;
maxX = 180; //world wrap: 360 deg
if (maxY <= 90 && minY >= -90)
{
//doesn't pass either pole: 180 deg
minX = NormLonDEG(lon - 90);
maxX = NormLonDEG(lon + 90);
}
if (maxY > 90)
{
maxY = 90;
}
if (minY < -90)
{
minY = -90;
}
}
else
{
//--calc longitude bounds
double lon_delta_deg = CalcBoxByDistFromPt_deltaLonDEG(lat, lon, distDEG);
minX = NormLonDEG(lon - lon_delta_deg);
maxX = NormLonDEG(lon + lon_delta_deg);
}
}
if (reuse == null)
{
return(ctx.MakeRectangle(minX, maxX, minY, maxY));
}
else
{
reuse.Reset(minX, maxX, minY, maxY);
return(reuse);
}
}