algorithm for calculating x,y for drawing some nodes

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C#

Javascript

graphics

web

public enum TPosisioning
{
    Static = 1,
    Absolute = 2,
    Relative = 3,
    Fixed = 4,
}

public class TDrawingNode
{
    public string Text;
    public string Id;
    public int X, Y, W, H, ZIndex;
    public bool Movable, Transferable;
    public bool Resizable;
    public TPosisioning Posisioning;
    public List<TDrawingNode> SubNodes;
}

I have a c# class in which some elements are stored and each element has sub nodes, x,y,w,h, and Positioning.
I want to draw them by SVG Elements.
BTW Browsers have an algorithm to draw HTML Elements,
I need that algorithm which calculate nodes's x,y for drawing.
Where to find the best solution or library for that?
Any suggestion would be appreciated.

Thanks in advance.
Jamal.