Op::build_handles() is used for this.
You would append the matrix to the ViewerContext modelmatrix and then call
Knob::build_handle() on the XY knobs. The convenience function
Op::build_knob_handles() normally does this but I think you'll need to call
build_handle() in the correct order.
The key is appending the matrix before the Knob::build_handle() calls are done
because each knob pushes themselves onto the draw list and the current matrix
is stored at that point which needs to be the parent matrix state the knob
needs to be drawn in.
I can't remember what Axis_Knob does exactly, I think it applies it's own
matrix during draw_handles(), so you may need to manually call
Knob::build_handle() in the correct order, something like:
MyOp::build_handles() {
Axis_Knob::build_handle()
save ctx->modelmatrix
append matrix to ctx->modelmatrix
Call all XY_Knob::build_handle()s
restore ctx->modelmatrix
}
You normally also have to test the Viewer transform mode and whether the node's
panel is open, and whether the node is disabled in order to do the right thing
for each state in build_handles().
Good luck,
-jonathan
On Feb 13, 2013, at 7:48 AM, kulitorum wrote:
> I'm working on a plugin that has a lot of control points in the image.
>
> I want to be able to link all the control points to a tracker, so they follow
> the image around, so I added a Matrix4 in the GUI.
>
> How do I get my points (XY_knobs) to move around with the matrix?
>
> I hacked something together to update the transformation matrix inside
> draw_handle, but there's gotter be a better, more streamlined way of doing
> this? - Also because I have to invert the matrix to let the use move the
> point around in my handle function.
>
> What is the prober way to do this?
>
> Michael
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