Relative_Pointer_Position

title: How to find relative mouse position? layout: demo_page

In some cases you may need to find position of a point relative to a node. For purpose we can use mathematical Konva.Transform methods.

In this demo we have deep nesting transformed nodes: moved stage, scaled layer, rotated group. Now we want to add circles into the group on click. But how to find position of that circles? We can't use stage.getPointerPosition() directly because that is position relative to top-left corner of the stage.

The idea is simple. We just need to use inverted absolute transform.