/// <summary>
/// Converts a bounding rectangle in 'model space' into the equivalent
/// bounds in 'screen space'. Used to determine how much space the model
/// will take up on screen given a particular scale, zoom, and margin.
/// </summary>
/// <param name="modelBounds">the bounds of the model</param>
/// <returns>the bounds of the diagram as drawn on screen</returns>
public virtual Rect CalculateScreenBounds(Rect modelBounds)
{
var scale = rendererModel.GetScale();
var zoom = rendererModel.GetZoomFactor();
var margin = rendererModel.GetMargin();
var modelScreenCenter = this.ToScreenCoordinates(
modelBounds.X + modelBounds.Width / 2,
modelBounds.Y + modelBounds.Height / 2);
var width = (scale * zoom * modelBounds.Width) + (2 * margin);
var height = (scale * zoom * modelBounds.Height) + (2 * margin);
return(new Rect(modelScreenCenter.X - width / 2,
modelScreenCenter.Y - height / 2,
width, height));
}
