/// <summary>
/// Reprojects a <see cref="Bitmap"/> and corresponding georeferenced metadata to
/// a new coordinate system.
/// </summary>
/// <param name="sourceReference">The georeferenced metadata of <paramref name="sourceTile"/>.</param>
/// <param name="sourceTile">The tile image.</param>
/// <param name="targetReference">Output: The reprojected georeferenced metadata.</param>
/// <param name="targetTile">Output: The reprojected tile image.</param>
public void Reproject(WorldFile sourceReference, Bitmap sourceTile, out WorldFile targetReference, out Bitmap targetTile)
{
if (source == null || target == null || source.Equals(target))
{
targetReference = sourceReference;
targetTile = sourceTile;
return;
}
Rectangle targetTileExtentInPixelCoordinates = GetTargetExtentInPixelCoordinates(sourceReference, sourceTile);
// Get the intersection with the current viewport
targetTileExtentInPixelCoordinates.Intersect(mapArgs.ImageRectangle);
// Is it empty, don't return anything
if (targetTileExtentInPixelCoordinates.Width == 0 || targetTileExtentInPixelCoordinates.Height == 0)
{
targetTile = null;
targetReference = null;
return;
}
int offsetX = targetTileExtentInPixelCoordinates.X;
int offsetY = targetTileExtentInPixelCoordinates.Y;
// Prepare the result tile
targetTile = new Bitmap(targetTileExtentInPixelCoordinates.Size.Width, targetTileExtentInPixelCoordinates.Size.Height,
PixelFormat.Format32bppArgb);
using (Graphics g = Graphics.FromImage(targetTile))
{
g.Clear(Color.Transparent);
}
ColorAccess sourceTileColorAccess = ColorAccess.Create(sourceTile);
ColorAccess targetTileColorAccess = ColorAccess.Create(targetTile);
// Copy values to output buffer
Size sourceTileSize = sourceTile.Size;
for (var i = 0; i < targetTile.Height; i++)
{
foreach (Tuple <Point, Point> ppair in
GetValidPoints(offsetY + i, offsetY, offsetX, offsetX + targetTile.Width, sourceReference, sourceTileSize))
{
Color c = sourceTileColorAccess[ppair.Item1.X, ppair.Item1.Y];
targetTileColorAccess[ppair.Item2.X, ppair.Item2.Y] = c;
}
}
// Copy to output tile
targetTileColorAccess.SetBufferToImageAtOriginalLocation(targetTile);
// Compute the reference
Extent outExtent = mapArgs.PixelToProj(targetTileExtentInPixelCoordinates);
targetReference = new WorldFile(
outExtent.Width / targetTileExtentInPixelCoordinates.Width, 0,
0, -outExtent.Height / targetTileExtentInPixelCoordinates.Height,
outExtent.X, outExtent.Y);
}
public void SetBufferToImageAtOriginalLocation_BitmapNull_ThrowArgumentNullException()
{
// Setup
ColorAccess colorAccess = ColorAccess.Create(Resources.acorn);
// Call
TestDelegate call = () => colorAccess.SetBufferToImageAtOriginalLocation(null);
// Assert
string paramName = Assert.Throws <ArgumentNullException>(call).ParamName;
Assert.AreEqual("bitmap", paramName);
}
public void SetBufferToImageAtOriginalLocation_AfterModificationsToBuffer_TargetImageUpdated()
{
// Setup
ColorAccess colorAccess = ColorAccess.Create(Resources.acorn);
for (var i = 0; i < 16; i++)
{
colorAccess[i, i] = Color.Red;
colorAccess[i, 15 - i] = Color.Red;
}
using (var targetImage = (Bitmap)Resources.acorn.Clone())
{
// Call
colorAccess.SetBufferToImageAtOriginalLocation(targetImage);
// Assert
TestHelper.AssertImagesAreEqual(Resources.acornWithCross, targetImage);
}
}