/**
* Construct a model with the given PaintTool as start PaintTool
**/
internal Model(PaintTool initPaintTool, ColorTool initColorTool)
{
setUpFactories(initColorTool);
currentFactory = Factories[initPaintTool.type];
currentFactory.ChangePaintTool(initPaintTool, initColorTool);
currentColorTool = initColorTool;
}
