Question

I am looking for a 2D slider in Cocoa.

It should be something similar to this:

_{(source: wolfram.com)}

which is Mathematica’s 2D slider look here. It seems that there is nothing like this in Xcode interface builder.

Basically my cocoa interface should show a room seen from above (the space where the 2d slider can move), and when I click on it, the 2D cursor moves to that location in the room.
Any ideas on how to do this?

An easy way would be to have 2 orthogonal 1D slider, but it’s not a nice looking solution.

Cheers!

Answer 1

The really simple way: subclass NSView, and use the Three-Method Approach to mouse event handling to record the current point (converted to whatever coordinate space you choose, such as 0,0 at the center). In -drawRect:, draw your intersecting lines and “knob” (either directly or by drawing a pre-rendered “knob.png” image, for example). Since NSView inherits from NSResponder, you can use the target/action mechanism to notify your controller when the view’s value changed due to a click or knob-drag.