/// <summary>
/// Draws a portion of the specified <see cref="OxyImage" />.
/// </summary>
/// <param name="source">The source.</param>
/// <param name="srcX">The x-coordinate of the upper-left corner of the portion of the source image to draw.</param>
/// <param name="srcY">The y-coordinate of the upper-left corner of the portion of the source image to draw.</param>
/// <param name="srcWidth">Width of the portion of the source image to draw.</param>
/// <param name="srcHeight">Height of the portion of the source image to draw.</param>
/// <param name="destX">The x-coordinate of the upper-left corner of drawn image.</param>
/// <param name="destY">The y-coordinate of the upper-left corner of drawn image.</param>
/// <param name="destWidth">The width of the drawn image.</param>
/// <param name="destHeight">The height of the drawn image.</param>
/// <param name="opacity">The opacity.</param>
/// <param name="interpolate">interpolate if set to <c>true</c>.</param>
public override void DrawImage(
OxyImage source,
double srcX,
double srcY,
double srcWidth,
double srcHeight,
double destX,
double destY,
double destWidth,
double destHeight,
double opacity,
bool interpolate)
{
if (destWidth <= 0 || destHeight <= 0 || srcWidth <= 0 || srcHeight <= 0)
{
return;
}
var image = CreateAndAdd <Image>(destX, destY);
var bitmapChain = GetImageSource(source);
// ReSharper disable CompareOfFloatsByEqualityOperator
if (srcX == 0 && srcY == 0 && srcWidth == bitmapChain.PixelSize.Width && srcHeight == bitmapChain.PixelSize.Height)
// ReSharper restore CompareOfFloatsByEqualityOperator
{
// do not crop
}
else
{
image.Clip = new RectangleGeometry(new Rect(srcX, srcY, srcWidth, srcHeight));
}
image.Opacity = opacity;
image.Width = destWidth;
image.Height = destHeight;
image.Stretch = Stretch.Fill;
// Set the position of the image
Canvas.SetLeft(image, destX);
Canvas.SetTop(image, destY);
//// alternative: image.RenderTransform = new TranslateTransform(destX, destY);
image.Source = bitmapChain;
if (interpolate)
{
RenderOptions.SetBitmapInterpolationMode(image, global::Avalonia.Visuals.Media.Imaging.BitmapInterpolationMode.LowQuality);
}
else
{
RenderOptions.SetBitmapInterpolationMode(image, global::Avalonia.Visuals.Media.Imaging.BitmapInterpolationMode.Default);
}
}
