/// <summary>
/// Determines the bounding box of all the objects and update
/// the scroll min position. If there are any nodes falling outside
/// translate everything until they are visible
/// </summary>
public void UpdateBoundingBox()
{
var bbox = NodeExtensions.GetBoundingBox(Nodes.Select(n => n.Area));
int left = bbox.Left;
int top = bbox.Top;
int right = bbox.Right;
int bottom = bbox.Bottom;
// if nodes are outside the boundaries move all the nodes so they become visible
if (left < 0)
{
right += Math.Abs(left);
foreach (var n in Nodes)
{
n.Position = new Point(n.Position.X + Math.Abs(left), n.Position.Y);
}
}
if (top < 0)
{
bottom += Math.Abs(top);
foreach (var n in Nodes)
{
n.Position = new Point(n.Position.X, n.Position.Y + Math.Abs(top));
}
}
AutoScrollMinSize = new System.Drawing.Size((int)((right + 1) * Zoom), (int)((bottom + 1) * Zoom));
}
/// <summary>
/// Draw the entire diagram to a bitmap and return it
/// </summary>
/// <returns>A bitmap of the entire diagram</returns>
public Image AsImage()
{
// determine the bounding box
var bbox = NodeExtensions.GetBoundingBox(Nodes.Select(n => n.Area));
bbox = new Rectangle(0, 0, bbox.Right + 1, bbox.Bottom + 1);
bbox.Inflate(NodeSize.Width, NodeSize.Height);
Bitmap bmp = new Bitmap(bbox.Width, bbox.Height);
using (Graphics g = Graphics.FromImage(bmp))
{
DrawContents(g, bbox, new Point(0, 0), 1);
}
return(bmp);
}