1.Core parts is constructed by Tida.Canvas.Contracts and Tida.Canvas.Infrastructure,the previous one defines the basic concepts for a Canvas(ICanvasControl,DrawObject,CanvasLayer,EditTool...),input(Mouse and keyboard),media(Color
	,Pen..).the latter one provides the common codes(like LineBase,PointBase) that user codes might leverage.to make these codes platform-independent,both parts are built on .Net Standard platform.
	
	2.WPF part:Tida.Canvas.WPFCanvas contains a WPF implementation for a ICanvasControl,this implementation is a the only one at present.
	
	3.Example parts:Tida.Canvas.Base provides some useful basic tools(DrawObjects and EditTools),Tida.Canvas.Shell.Contracts defines the contract for the Example framework.
	Tida.Canvas.Shell provides the main implementations of UI parts,(note:This project use the Progress Telerik UI controls for WPF Trail version),to make the framwork more 
	extensible,these projects are build on Prism and MEF, Tida.Canvas.Launcher is the entry project,which refrence these parts as Modules.