void AddImage_Clicked(System.Object sender, System.EventArgs e)
{
var index = _rand.Next(0, _buffer.Count());
index = 13;
var im = SKImage.FromEncodedData(_buffer.ElementAt(index)).ToTextureImage(SkiaView.GRContext);
var img = new MyImage()
{
Image = im
};
if (_numberOfImages % 8 == 0)
{
_lastX = 0;
_lastY += imagesize + _padding;
}
else
{
_lastX += imagesize + _padding;
}
img.Destination = new SKRect(_lastX, _lastY, _lastX + imagesize, _lastY + imagesize);
_images.Add(img);
_numberOfImages++;
SkiaView.InvalidateSurface();
}
private void Pinch_PinchUpdated(object sender, PinchGestureUpdatedEventArgs e)
{
if (e.Status == GestureStatus.Started)
{
_startScale = _lastScale;
}
else if (e.Status == Xamarin.Forms.GestureStatus.Running)
{
_currentScale += (e.Scale - 1) * _startScale;
_currentScale = Math.Max(0.003, _currentScale);
_currentMatrix.ScaleX = (float)_currentScale;
_currentMatrix.ScaleY = (float)_currentScale;
SkiaView.InvalidateSurface();
}
}
void RemoveImage_Clicked(System.Object sender, System.EventArgs e)
{
if (_images.Count() != 0)
{
_images.RemoveAt(_images.Count() - 1);
_numberOfImages--;
if (_numberOfImages % 5 == 0)
{
_lastX = 0;
_lastY -= imagesize + _padding;
}
else
{
_lastX -= imagesize + _padding;
}
}
SkiaView.InvalidateSurface();
}
void Quality_SelectedIndexChanged(System.Object sender, System.EventArgs e)
{
switch (QualityPicker.SelectedIndex)
{
case 0:
_quality = SKFilterQuality.None;
break;
case 1:
_quality = SKFilterQuality.Low;
break;
case 2:
_quality = SKFilterQuality.Medium;
break;
case 3:
_quality = SKFilterQuality.High;
break;
}
SkiaView.InvalidateSurface();
}
private void SkiaView_Touch(object sender, SkiaSharp.Views.Forms.SKTouchEventArgs e)
{
switch (e.ActionType)
{
case SkiaSharp.Views.Forms.SKTouchAction.Entered:
_dragX = e.Location.X;
_dragY = e.Location.Y;
break;
case SkiaSharp.Views.Forms.SKTouchAction.Moved:
_currentMatrix.TransX = _dragX + e.Location.X;
_currentMatrix.TransY = _dragY + e.Location.Y;
SkiaView.InvalidateSurface();
break;
case SkiaSharp.Views.Forms.SKTouchAction.Released:
break;
default:
break;
}
}
private async Task DrawScaledUpImage()
{
if (_applyDitherBitmap == null)
{
return;
}
if (SkiaView.CanvasSize.Width > 0)
{
int newCanvasWidth = (int)SkiaView.CanvasSize.Width;
int newCanvasHeight = (int)(SkiaView.CanvasSize.Width * (_applyDitherBitmap.Height / (double)_applyDitherBitmap.Width));
if ((int)SkiaView.CanvasSize.Width > (int)SkiaView.CanvasSize.Height)
{
newCanvasWidth = (int)(SkiaView.CanvasSize.Height * (_applyDitherBitmap.Width / (double)_applyDitherBitmap.Height));
newCanvasHeight = (int)SkiaView.CanvasSize.Height;
}
_drawBitmap = new SKBitmap(newCanvasWidth, newCanvasHeight);
}
_applyDitherBitmap.ScalePixels(_drawBitmap, SKFilterQuality.None);
SkiaView.InvalidateSurface();
}
void ZoomOut_Clicked(System.Object sender, System.EventArgs e)
{
_currentMatrix.ScaleX -= _zoomFactor;
_currentMatrix.ScaleY -= _zoomFactor;
SkiaView.InvalidateSurface();
}