main.js 
    $selectedNode   //which node is active 

    init()  //basic init function 
    
    //utility function 
    isPointInNode(x,y,node) check pointer on node 

    //render function 
    renderNodeList()

    //select block function 
    drawSelectOutline()
    getResizeHandleAtPoint(mouseX, mouseY) 
    mainCanvas.
        e(mouseup)
        e(mousedown)
        e(mousemove)


//update to render 
prop_panel.js   //create html from for nodePros 


nm.js //node manager for get set remove add update select 
    
    $nodes = []     //array of all nodes 

    nm('nodeId.props')
    getNode(nodeId)
    addNode()
    createNode()    //
    removeNode()    //remove $selectNode 
    updateNode()    //update props $selectNode 
    clearNodes()    //remove all node 

    load_ly()
    upload_ly() 
    download_ly() 


ly.js   //node block ly coordinate set 
    ly(b_block)     //this call ly_fn for get cordinat 
    
    ly_uz(f, ly_flag, o_flag, c_box,)   //read doc for ly 
    ly_cell()
    

parse_ly.js     //parse line and create node 
    parse_ly(line)


draw.js  //responsible to draw block 
    drawAllNode(nodes)   //draw all node 
        ctx.clear       //clear canvas 
        for node in nodes: ly(node)     //set  all node coordinate 
        for node in nodes:  drawNode(node)  //draw all node 
        if selectedNode: drawSelectOutline(selectedNode)

    drawNode(b_block)      //draw node in canvas 
        


//--------------------------------------------------    
draw.drawAllNode(nodes)   //draw all node 
    ctx.clear       //clear canvas 
    for node in nodes: ly(node)     //set  all node coordinate 
    for node in nodes:  drawNode(node)  //draw all node 
    if selectedNode: drawSelectOutline(selectedNode)



fn createNode()
    //this function createNode 

fn parse_ly()