protected override Size MeasureOverride(Size availableSize)
{
// Note that we do not call the Measure method on any children
// because a ViewFinderDisplay has no children. It is merely used
// as a surface for the view finder's VisualBrush.
// store the available size for use by the Zoombox control
_availableSize = availableSize;
// Simulate size-to-content for the display panel by ensuring a width and height
// based on the content bounds. Otherwise, the display panel may have no size, since it doesn't
// contain content.
double width = DoubleHelper.IsNaN(this.ContentBounds.Width) ? 0 : Math.Max(0, this.ContentBounds.Width);
double height = DoubleHelper.IsNaN(this.ContentBounds.Height) ? 0 : Math.Max(0, this.ContentBounds.Height);
Size displayPanelSize = new Size(width, height);
// Now ensure that the result fits within the available size while maintaining
// the width/height ratio of the content bounds
if (displayPanelSize.Width > availableSize.Width || displayPanelSize.Height > availableSize.Height)
{
double aspectX = availableSize.Width / displayPanelSize.Width;
double aspectY = availableSize.Height / displayPanelSize.Height;
double scale = (aspectX < aspectY) ? aspectX : aspectY;
displayPanelSize = new Size(displayPanelSize.Width * scale, displayPanelSize.Height * scale);
}
return(displayPanelSize);
}
public static bool IsEmpty(Point point)
{
return(DoubleHelper.IsNaN(point.X) && DoubleHelper.IsNaN(point.Y));
}
