public static void DrawImage(this SKCanvas canvas, SKImage image, SKRect dest,
ImageStretch stretch,
ImageAlignment horizontal = ImageAlignment.Center,
ImageAlignment vertical = ImageAlignment.Center,
SKPaint paint = null)
{
if (stretch == ImageStretch.Fill)
{
canvas.DrawImage(image, dest, paint);
}
else
{
float scale = 1;
switch (stretch)
{
case ImageStretch.None:
break;
case ImageStretch.Uniform:
scale = Math.Min(dest.Width / image.Width, dest.Height / image.Height);
break;
case ImageStretch.UniformToFill:
scale = Math.Max(dest.Width / image.Width, dest.Height / image.Height);
break;
}
SKRect display = CalculateDisplayRect(dest, scale * image.Width, scale * image.Height, horizontal, vertical);
canvas.DrawImage(image, display, paint);
}
}
public static System.Windows.Media.Stretch ConvertTo(this ImageStretch source)
{
switch (source)
{
case ImageStretch.Fill:
return(System.Windows.Media.Stretch.Fill);
case ImageStretch.None:
return(System.Windows.Media.Stretch.None);
case ImageStretch.Uniform:
return(System.Windows.Media.Stretch.Uniform);
case ImageStretch.UniformToFill:
return(System.Windows.Media.Stretch.UniformToFill);
}
return(System.Windows.Media.Stretch.None);
}
public override void Parse(string data)
{
base.Parse(data);
XmlNode node = XmlUtils.CreateNodeFromData(data);
string stretchValue = XmlUtils.GetAttributeValue(node, STRETCH);
string rotationValue = XmlUtils.GetAttributeValue(node, ROTATION);
this.Rotation = float.Parse(rotationValue);
this.Stretch = ImageStretchUtils.FromString(stretchValue);
}
public static async Task <BitmapImage> LoadImage(string url, ImageStretch imageStretch, int maxWidth,
int maxHeight)
{
if (string.IsNullOrEmpty(url))
{
return(null);
}
if (loading)
{
return(null);
}
if (lastDownloaded.Equals(url))
{
return(_image);
}
using (var client = new WebClient())
{
lastDownloaded = url;
try
{
var data = await client.DownloadDataTaskAsync(url);
if (data != null)
{
var memoryStream = new MemoryStream(data);
_image = new BitmapImage();
_image.BeginInit();
_image.StreamSource = memoryStream;
_image.StreamSource.Position = 0;
_image.EndInit();
_image.Freeze();
if (imageStretch == ImageStretch.None)
{
if (maxHeight > 0 || maxWidth > 0)
{
var tmp = new BitmapImage();
tmp.BeginInit();
tmp.StreamSource = memoryStream;
memoryStream.Position = 0;
var modified = false;
if (maxHeight > 0 && _image.PixelHeight > maxHeight)
{
if (_image.PixelHeight > _image.PixelWidth || maxWidth == 0)
{
tmp.DecodePixelHeight = maxHeight;
}
else
{
tmp.DecodePixelWidth = maxWidth;
}
modified = true;
}
if (maxWidth > 0 && _image.PixelWidth > maxHeight && !modified)
{
if (_image.PixelWidth > _image.PixelHeight || maxHeight == 0)
{
tmp.DecodePixelWidth = maxWidth;
}
else
{
tmp.DecodePixelHeight = maxHeight;
}
}
tmp.EndInit();
tmp.Freeze();
_image = tmp;
}
}
loading = false;
return(_image);
}
return(null);
}
catch (Exception ex)
{
return(null);
}
}
}
/// <summary>
/// Копировать данные из элемента
/// </summary>
protected override void CopyFrom(Element srcElem)
{
base.CopyFrom(srcElem);
StaticPicture staticPicture = (StaticPicture)srcElem;
BorderColor = staticPicture.BorderColor;
Image = staticPicture.Image == null ? null : staticPicture.Image.CloneWithoutData();
ImageStretch = staticPicture.ImageStretch;
}
