Why is the selected area greater than the actual graphics area?

@3q wrote:

function makeArc(data) {
return new go.Geometry()
  .add(new go.PathFigure(data.radius + data.radius * Math.cos(data.start * Math.PI / 180),
                         data.radius + data.radius * Math.sin(data.start * Math.PI / 180),
                         false)
    .add(new go.PathSegment(go.PathSegment.Arc,
                            data.start, data.sweep,
                            data.radius, data.radius,
                            data.radius, data.radius)
  ));
}
var arc_sketchTemplate = g_(go.Node, "Viewbox",{
	resizable: true,
        resizeObjectName: "LAMP",
	rotatable: true,
	locationSpot: go.Spot.Center, 
	locationObjectName: "LAMP",
	//selectionAdorned: false,
        selectionObjectName: "LAMP",
        background: null
  },
  new go.Binding("angle","angle").makeTwoWay(),
  new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
  new go.Binding("layerName", "isSelected", function(s) { return s ? "Foreground" : ""; }).ofObject(),
  g_(go.Panel, "Spot",        
    g_(go.Shape,  // arc
      { 
    	name: "LAMP",
    	fill: null, 
    	stroke: "rgba(0,0,0,1)", 
    	strokeWidth: 2,
        alignment: new go.Spot(0,0,0,0)
      },
      new go.Binding("stroke","color"), 
      new go.Binding("strokeWidth","thickness").makeTwoWay(),
      new go.Binding("geometry", "", makeArc),
      new go.Binding("desiredSize","desiredSize",go.Size.parse).makeTwoWay(go.Size.stringify)),
  g_(go.TextBlock,
    {
	  editable: true,
	  _isNodeLabel: true,
	  alignment: new go.Spot(0.5,1,0,20),
	  cursor: "pointer",
      stroke: "rgba(0,0,0,1)", background: "transparent"
    },
    new go.Binding("font","font"), 
    new go.Binding("stroke","text_color"),
    new go.Binding("alignment").makeTwoWay(), 
    new go.Binding("text", "text"))
));

As shown in the figure, the graphics area is significantly smaller than the selected area.
I want the selected region to be exactly the actual area. What should I do?

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