private IImage GetScaledImage(Bitmap?img,
Stream?stream,
Double imgDesiredWidth,
Boolean isPreserveStream)
{
if (img == null)
{
return(GetNullImage());
}
if (imgDesiredWidth.AreEqualEnough(img.Width))
{
return(isPreserveStream
? new AndroidBitmap(img, stream)
: new AndroidBitmap(img, null));
}
var scaleRatio = imgDesiredWidth / img.Width;
var width = Convert.ToInt32(img.Width * scaleRatio);
var height = Convert.ToInt32(img.Height * scaleRatio);
var scaledBitmap = Bitmap.CreateScaledBitmap(img,
width, height, true);
img.Dispose();
return(new AndroidBitmap(scaledBitmap !, null));
}
public ScaleTransform(Double scaleX,
Double scaleY)
{
ScaleX = scaleX;
ScaleY = scaleY;
IsIdentity = ScaleX.AreEqualEnough(1.0) && ScaleY.AreEqualEnough(1.0);
Value = IsIdentity
? TransformationMatrix.Identity
: new TransformationMatrix(scaleX, 0, 0, scaleY, 0, 0);
}
public Boolean TrySetZoomLevel(Double zoom)
{
if (ZoomLevel.AreEqualEnough(zoom))
{
return(true);
}
if (zoom < _minZoomLevel || zoom > _maxZoomLevel)
{
return(false);
}
ZoomLevel = zoom;
IsChanged = true;
return(true);
}
public Boolean UpdateSize(Double width,
Double height)
{
lock (_sizeLock)
{
if (width.AreEqualEnough(_width) &&
height.AreEqualEnough(_height))
{
return(false);
}
if (width.IsZero() ||
height.IsZero())
{
return(false);
}
if (_currentDib != IntPtr.Zero)
{
Native.DeleteObject(_currentDib);
}
_bmp.Dispose();
_dcGraphics?.Dispose();
if (_memoryDeviceContext != IntPtr.Zero)
{
DeleteDC(_memoryDeviceContext);
}
var iwidth = Convert.ToInt32(width);
var iheight = Convert.ToInt32(height);
//////////////////////////////////
if (!Invalidate(iwidth, iheight, _backgroundColor))
{
return(false);
}
//////////////////////////////////
_bmp = new Bitmap(iwidth, iheight);
using (var g = _bmp.GetSmoothGraphics())
g.Clear(_backgroundColor);
return(true);
}
}
public TransformationMatrix(Double scaleX,
Double skewX,
Double skewY,
Double scaleY,
Double offsetX,
Double offsetY)
{
ScaleX = scaleX;
SkewX = skewX;
SkewY = skewY;
ScaleY = scaleY;
OffsetX = offsetX;
OffsetY = offsetY;
_aboutMe = "";
if (OffsetX.IsNotZero())
{
_aboutMe += "Offset-X: " + OffsetX;
}
if (OffsetY.IsNotZero())
{
_aboutMe += " Offset-Y: " + OffsetY;
}
if (String.IsNullOrEmpty(_aboutMe))
{
_aboutMe = "Identity";
}
IsIdentity = offsetX.IsZero() &&
offsetY.IsZero() &&
scaleX.AreEqualEnough(1.0) &&
scaleY.AreEqualEnough(1.0) &&
skewX.IsZero() &&
skewY.IsZero();
}