/// <summary>
/// Sets the transformation needed to draw the model on the canvas when
/// the diagram needs to fit the screen.
/// </summary>
/// <param name="screenBounds">the bounding box of the draw area</param>
/// <param name="modelBounds">the bounding box of the model</param>
/// <param name="bondLength">the average bond length of the model</param>
/// <param name="reset">if true, model center will be set to the modelBounds center and the scale will be re-calculated</param>
protected virtual void SetupTransformToFit(Rect screenBounds, Rect modelBounds, double bondLength, bool reset)
{
if (screenBounds == null)
{
return;
}
SetDrawCenter(screenBounds.X + screenBounds.Width / 2, screenBounds.Y + screenBounds.Height / 2);
var scale = this.CalculateScaleForBondLength(bondLength);
var drawWidth = screenBounds.Width;
var drawHeight = screenBounds.Height;
var diagramWidth = modelBounds.Width * scale;
var diagramHeight = modelBounds.Height * scale;
SetZoomToFit(drawWidth, drawHeight, diagramWidth, diagramHeight);
// this controls whether editing a molecule causes it to re-center
// with each change or not
if (reset || rendererModel.GetFitToScreen())
{
SetModelCenter(modelBounds.X + modelBounds.Width / 2, modelBounds.Y + modelBounds.Height / 2);
}
// set the scale in the renderer model for the generators
rendererModel.SetScale(scale);
Setup();
}
