To get the absolute position of an owner, you can use "self owner
position". You can thereby convert between absolute and relative
coordinates of a submorph.
You should set coordinates for the bounding box of a submorph, which
indirectly sets its position (NOTE: that the "position" message
returns "bounds topLeft" in Morph). To set the bounding box, you can
use "self bounds: aRectangle", where aRectangle uses absolute world
coordinates.
In general, things seem to work better if you use a bounding box
slightly larger than the graphics rendered by your morph (and the
"expandBy:" message in Rectangle might be useful for doing this).
The bounding box is meant to be a rough approximation of the area
rendered by a morph, so as a heads up you might want to look at
redefining the "containsPoint:" message to precisely define the
region covered by your morph so that things like MouseEvent's are
delivered only when appropriate.
At least that is the best way I've found...
Naveen
On Apr 7, 2006, at 10:52 AM, Brian Greskamp wrote:
> I'm building a schematic editor where I need to control the
> relative placement of a submorph inside its owner morph. In the
> view, I have a morph representing a circuit. Each CircuitMorph has
> arbitrarily many child CircuitMorphs. In the model, each Circuit
> stores a fixed point position relative to it's parent Circuit's
> upper left corner.
>
> I tried to render the view doing the naive thing; each CircuitMorph
> does: "self position: model position". The problem is that "Morph
> >> position:" seems to be setting the *absolute* position within
> the world rather than position relative to the owner. How do I set
> a position relative to the owner?
>
> Thanks for helping a Morphic newbie.
> --Brian
>
> --
> Brian Greskamp
> 4238 Siebel Center
> 201 N. Goodwin Ave.
> Urbana, IL 61801
>
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