void Warp(C1Bitmap src, C1Bitmap dst, Point start, Point end)
{
dst.BeginUpdate();
dst.Copy(src, false);
var dist = Distance(start, end);
var affectedDist = dist * 1.5;
var affectedDistSquared = affectedDist * affectedDist;
for (int row = 0; row < dst.Height; ++row)
{
for (int col = 0; col < dst.Width; ++col)
{
var point = new Point(col, row);
if (DistanceSq(start, point) > affectedDistSquared)
{
continue;
}
if (DistanceSq(end, point) < 0.25)
{
dst.SetPixel(col, row, src.GetPixel((int)start.X, (int)start.Y));
continue;
}
var dir = new Point(point.X - end.X, point.Y - end.Y);
var t = IntersectRayCircle(end, dir, start, affectedDist);
TryT(-end.X / dir.X, ref t);
TryT(-end.Y / dir.Y, ref t);
TryT((dst.Width - end.X) / dir.X, ref t);
TryT((dst.Height - end.X) / dir.X, ref t);
var anchor = new Point(end.X + (point.X - end.X) * t, end.Y + (point.Y - end.Y));
var x = start.X + (anchor.X - start.X) / t;
var y = start.Y + (anchor.Y - start.Y) / t;
dst.SetPixel(col, row, src.GetInterpolatedPixel(x, y));
}
}
dst.EndUpdate();
}
private async void ExportImage(object sender, RoutedEventArgs e)
{
if (selection.Width == 0 || selection.Height == 0)
{
MessageDialog md = new MessageDialog(Strings.EmptySelectionMessage);
md.ShowAsync();
return;
}
var picker = new FileSavePicker();
picker.FileTypeChoices.Add("png", new List <string> {
".png"
});
picker.DefaultFileExtension = ".png";
StorageFile file = await picker.PickSaveFileAsync();
if (file != null)
{
var saveStream = await file.OpenStreamForWriteAsync();
var crop = new C1Bitmap((int)selection.Width, (int)selection.Height);
crop.BeginUpdate();
for (int x = 0; x < selection.Width; ++x)
{
for (int y = 0; y < selection.Height; ++y)
{
crop.SetPixel(x, y, bitmap.GetPixel(x + (int)selection.X, y + (int)selection.Y));
}
}
crop.EndUpdate();
var readStream = crop.GetStream(ImageFormat.Png, true);
var data = new byte[readStream.Length];
readStream.Read(data, 0, (int)readStream.Length);
saveStream.Write(data, 0, data.Length);
saveStream.Dispose();
}
}