Hi, Patrick -
I don't have time to actually debug this, and others may be able to
help you. But, assuming you got morph.stepByVelocities to work once,
I think the problem is that it's required for a morph to be in a
world before you can use stepping. Normally you would do this by
calling super at the beginning, but I don't think your commented
version of that will work. Try instead...
BoxMorph.subclass("LauncherMorph", {
addMorph: function($super, morph) {
$super(morph);
morph.velocity=pt(10,0);
morph.angularVelocity=Math.PI/16;
morph.moveOriginBy(morph.innerBounds().center());
//morph.stepByVelocities();
morph.startStepping(1000,"stepByVelocities");
}
});
The rule is: if you wish to call an overridden method, then add the
pseudo-argument '$super' at the beginning of the declared arguments.
Thereafter you can use $super to refer to the overridden procedure.
If the problem is what I think it is, this should help.
Good luck
- Dan
-------------------------------
Hi, Folks. I have this script (below) in a TextMorph. When I
evaluate each line it seems to work fine, until the last line which
causes this error "Type Error: Cannot call method 'startSteppingFor'
of null". How do I debug this?
BoxMorph.subclass("LauncherMorph", {
addMorph: function(morph) {
//super(morph);
morph.velocity=pt(10,0);
morph.angularVelocity=Math.PI/16;
morph.moveOriginBy(morph.innerBounds().center());
//morph.stepByVelocities();
morph.startStepping(1000,"stepByVelocities");
}
});
morph1 = new LauncherMorph(new Rectangle(50,100,80,360));
morph1.openInWorld();
morph2 = Morph.makeRectangle(new Rectangle(20,20,40,40));
morph1.addMorph(morph2);
Here's a link to my test
page: <http://www.lively-kernel.org/repository/lively-wiki/users/pshouse/test.xhtml>http://www.lively-kernel.org/repository/lively-wiki/users/pshouse/test.xhtml
Thanks,
Patrick
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