public virtual void LatitudeToPixelYTest()
{
foreach (int tileSize in TILE_SIZES)
{
for (sbyte zoomLevel = ZOOM_LEVEL_MIN; zoomLevel <= ZOOM_LEVEL_MAX; ++zoomLevel)
{
long mapSize = MercatorProjection.GetMapSize(zoomLevel, tileSize);
double pixelY = MercatorProjection.LatitudeToPixelY(MercatorProjection.LATITUDE_MAX, mapSize);
Assert.AreEqual(0, pixelY, 0);
pixelY = MercatorProjection.LatitudeToPixelYWithScaleFactor(MercatorProjection.LATITUDE_MAX, MercatorProjection.ZoomLevelToScaleFactor(zoomLevel), tileSize);
Assert.AreEqual(0, pixelY, 0);
pixelY = MercatorProjection.LatitudeToPixelY(0, mapSize);
Assert.AreEqual((float)mapSize / 2, pixelY, 0);
pixelY = MercatorProjection.LatitudeToPixelYWithScaleFactor(0, MercatorProjection.ZoomLevelToScaleFactor(zoomLevel), tileSize);
Assert.AreEqual((float)mapSize / 2, pixelY, 0);
pixelY = MercatorProjection.LatitudeToPixelY(MercatorProjection.LATITUDE_MIN, mapSize);
Assert.AreEqual(mapSize, pixelY, 0);
pixelY = MercatorProjection.LatitudeToPixelYWithScaleFactor(MercatorProjection.LATITUDE_MIN, MercatorProjection.ZoomLevelToScaleFactor(zoomLevel), tileSize);
Assert.AreEqual(mapSize, pixelY, 0);
}
}
}
public virtual void PixelYToLatitudeTest()
{
foreach (int tileSize in TILE_SIZES)
{
for (sbyte zoomLevel = ZOOM_LEVEL_MIN; zoomLevel <= ZOOM_LEVEL_MAX; ++zoomLevel)
{
long mapSize = MercatorProjection.GetMapSize(zoomLevel, tileSize);
double latitude = MercatorProjection.PixelYToLatitude(0, mapSize);
Assert.AreEqual(MercatorProjection.LATITUDE_MAX, latitude, 0);
latitude = MercatorProjection.PixelYToLatitudeWithScaleFactor(0, MercatorProjection.ZoomLevelToScaleFactor(zoomLevel), tileSize);
Assert.AreEqual(MercatorProjection.LATITUDE_MAX, latitude, 0);
latitude = MercatorProjection.PixelYToLatitude((float)mapSize / 2, mapSize);
Assert.AreEqual(0, latitude, 0);
mapSize = MercatorProjection.GetMapSizeWithScaleFactor(MercatorProjection.ZoomLevelToScaleFactor(zoomLevel), tileSize);
latitude = MercatorProjection.PixelYToLatitudeWithScaleFactor((float)mapSize / 2, MercatorProjection.ZoomLevelToScaleFactor(zoomLevel), tileSize);
Assert.AreEqual(0, latitude, 0);
latitude = MercatorProjection.PixelYToLatitude(mapSize, mapSize);
Assert.AreEqual(MercatorProjection.LATITUDE_MIN, latitude, 0);
latitude = MercatorProjection.PixelYToLatitudeWithScaleFactor(mapSize, MercatorProjection.ZoomLevelToScaleFactor(zoomLevel), tileSize);
Assert.AreEqual(MercatorProjection.LATITUDE_MIN, latitude, 0);
}
VerifyInvalidPixelYToLatitude(-1, (sbyte)0, tileSize);
VerifyInvalidPixelYToLatitude(tileSize + 1, (sbyte)0, tileSize);
}
}
public virtual void MetersToPixelTest()
{
foreach (int tileSize in TILE_SIZES)
{
Assert.True(MercatorProjection.MetersToPixels(10, 10.0, MercatorProjection.GetMapSize((sbyte)1, tileSize)) < 1);
Assert.True(MercatorProjection.MetersToPixels((long)(40 * 10e7), 10.0, MercatorProjection.GetMapSize((sbyte)1, tileSize)) > 1);
Assert.True(MercatorProjection.MetersToPixels(10, 10.0, MercatorProjection.GetMapSize((sbyte)20, tileSize)) > 1);
Assert.True(MercatorProjection.MetersToPixels(10, 89.0, MercatorProjection.GetMapSize((sbyte)1, tileSize)) < 1);
Assert.True(MercatorProjection.MetersToPixels((int)(40 * 10e3), 50, MercatorProjection.GetMapSize((sbyte)10, tileSize)) > 1);
}
}
private static void VerifyInvalidPixelYToLatitude(double pixelY, sbyte zoomLevel, int tileSize)
{
try
{
MercatorProjection.PixelYToLatitude(pixelY, MercatorProjection.GetMapSize(zoomLevel, tileSize));
Assert.Fail("pixelY: " + pixelY + ", zoomLevel: " + zoomLevel);
}
catch (System.ArgumentException)
{
Assert.True(true);
}
}
private static void VerifyInvalidGetMapSize(sbyte zoomLevel, int tileSize)
{
try
{
MercatorProjection.GetMapSize(zoomLevel, tileSize);
Assert.Fail("zoomLevel: " + zoomLevel);
}
catch (System.ArgumentException)
{
Assert.True(true);
}
}
public virtual void GetMapSizeTest()
{
foreach (int tileSize in TILE_SIZES)
{
for (sbyte zoomLevel = ZOOM_LEVEL_MIN; zoomLevel <= ZOOM_LEVEL_MAX; ++zoomLevel)
{
long factor = (long)Math.Round(MercatorProjection.ZoomLevelToScaleFactor(zoomLevel));
Assert.AreEqual(tileSize * factor, MercatorProjection.GetMapSize(zoomLevel, tileSize));
Assert.AreEqual(MercatorProjection.GetMapSizeWithScaleFactor(MercatorProjection.ZoomLevelToScaleFactor(zoomLevel), tileSize), MercatorProjection.GetMapSize(zoomLevel, tileSize));
}
VerifyInvalidGetMapSize((sbyte)-1, tileSize);
}
}
public virtual void TileYToLatitudeTest()
{
foreach (int tileSize in TILE_SIZES)
{
for (sbyte zoomLevel = ZOOM_LEVEL_MIN; zoomLevel <= ZOOM_LEVEL_MAX; ++zoomLevel)
{
double latitude = MercatorProjection.TileYToLatitude(0, zoomLevel);
Assert.AreEqual(MercatorProjection.LATITUDE_MAX, latitude, 0);
latitude = MercatorProjection.TileYToLatitude(0, MercatorProjection.ZoomLevelToScaleFactor(zoomLevel));
Assert.AreEqual(MercatorProjection.LATITUDE_MAX, latitude, 0);
long tileY = MercatorProjection.GetMapSize(zoomLevel, tileSize) / tileSize;
latitude = MercatorProjection.TileYToLatitude(tileY, zoomLevel);
Assert.AreEqual(MercatorProjection.LATITUDE_MIN, latitude, 0);
tileY = MercatorProjection.GetMapSizeWithScaleFactor(MercatorProjection.ZoomLevelToScaleFactor(zoomLevel), tileSize) / tileSize;
latitude = MercatorProjection.TileYToLatitude(tileY, MercatorProjection.ZoomLevelToScaleFactor(zoomLevel));
Assert.AreEqual(MercatorProjection.LATITUDE_MIN, latitude, 0);
}
}
}
/// <summary>
/// Calculates the zoom level that allows to display the <seealso cref="BoundingBox"/> on a view with the <seealso cref="Dimension"/> and
/// tile size.
/// </summary>
/// <param name="dimension">
/// the <seealso cref="Dimension"/> of the view. </param>
/// <param name="boundingBox">
/// the <seealso cref="BoundingBox"/> to display. </param>
/// <param name="tileSize">
/// the size of the tiles. </param>
/// <returns> the zoom level that allows to display the <seealso cref="BoundingBox"/> on a view with the <seealso cref="Dimension"/> and
/// tile size. </returns>
public static sbyte ZoomForBounds(Dimension dimension, BoundingBox boundingBox, int tileSize)
{
long mapSize = MercatorProjection.GetMapSize((sbyte)0, tileSize);
double pixelXMax = MercatorProjection.LongitudeToPixelX(boundingBox.MaxLongitude, mapSize);
double pixelXMin = MercatorProjection.LongitudeToPixelX(boundingBox.MinLongitude, mapSize);
double zoomX = -Math.Log(Math.Abs(pixelXMax - pixelXMin) / dimension.Width) / Math.Log(2);
double pixelYMax = MercatorProjection.LatitudeToPixelY(boundingBox.MaxLatitude, mapSize);
double pixelYMin = MercatorProjection.LatitudeToPixelY(boundingBox.MinLatitude, mapSize);
double zoomY = -Math.Log(Math.Abs(pixelYMax - pixelYMin) / dimension.Height) / Math.Log(2);
double zoom = Math.Floor(Math.Min(zoomX, zoomY));
if (zoom < 0)
{
return(0);
}
if (zoom > sbyte.MaxValue)
{
return(sbyte.MaxValue);
}
return((sbyte)zoom);
}