画线，如何计算坐标

public void DrawAttackLineByPos(Vector2 from, Vector2 to)

    {

        Debug.Log("DrawLine from " + from + " to " + to);

        var graph = new GGraph

        {

            name = "AttackLine",

        };

        graph.SetXY(from.x, from.y);

        graph.DrawRect(1, 1, 1, Color.red, Color.red);

        var shape = graph.shape;

        var line = shape.graphics.GetMeshFactory<LineMesh>();

        line.lineWidthCurve = AnimationCurve.Linear(0, 1, 1, 1);

        line.roundEdge = true;

        //line.gradient = lineGradient;

        line.path.Create(new GPathPoint {

            new GPathPoint(new Vector3(from.x, from.y, 0)),

            new GPathPoint(new Vector3(to.x, to.y, 0))

        });

        shape.graphics.SetMeshDirty();

        GTween.To(0, 1, 3).SetEase(EaseType.Linear).SetTarget(shape.graphics).OnUpdate((GTweener t) =>

        {

            ((NGraphics)t.target).GetMeshFactory<LineMesh>().fillEnd = t.value.x;

            ((NGraphics)t.target).SetMeshDirty();

        });

        GTween.To(0, 1, 3).SetEase(EaseType.Linear).SetTarget(shape.graphics).OnComplete((GTweener t) =>

        {

            //GRoot.inst.RemoveChild(graph);

        });

        GRoot.inst.AddChild(graph);

    }

大佬好：
我现在想从界面的一个组件A向组件B画线，这个坐标要如何计算呢？
现在传入的是2个组件的坐标给Vector2 from, Vector2 to
，但是画线后有明显的偏移，请问这个真正计算的时候包含unity坐标转换吗？
谢谢。