change fixed point of motion

[myatia]

When doing a shape tween, how do you change the fixed point of motion? What I'm looking to do is have a rectangle grow vertically, with its base remaining at the same point. With what I have now, the rectangle gets bigger, but it grows on each end. Does any body have any ideas to fix it? My ActionScript is at the bottom, if it helps.

Thanks,

Misty

onClipEvent(enterFrame) {
	
  function growBar() {
     var h = getProperty(_root.thisBar, _height);
     setProperty(_root.thisBar, _height, h + 1);
     setProperty(_root.thisBar, _y, 300);
   }

   _root.frame = 0;
   _root.intervalID = setInterval(growBar(), 50);
}

 

[billwatson]

sounds like it might be a registration point problem

i assume you placed a rectangle on the stage then converted it to a movie clip. when you do that you can set the registration point. i suspect the reg. pt. for your bar was in the middle (default). this would cause it to grow at both ends with the above code.
try making the bar again with a different reg point.

 

[myatia]

Is the registration point the little white circle that can be moved around when you're working with the free transform tool (sorry I'm so inarticulate here)? I put that circle on the bottom of the rectangle for both the movie clip instance, and inside the movie clip itself, and nothing changed. I added the following lines to my code

//y coordinate I'd like the base to be at
var rectBase = 250;

// After changing the height, set the 
// y coord. of the base
var newY = rectBase - 0.5 * _root.thisBar._height;
setProperty(_root.thisBar, _y, newY);

and that solved the problem, but I'd still like to know how to do it the other way. Thanks,

Misty

 

[billwatson]

glad that worked and my suggestion was just that ..a suggestion.

to get at the ref point draw a rectangle (i dont know of a way to access the reg point by actionscript) hit f8 to select movie clip,button, whatever then you will see to the right a box allowing you to select the reg point for the object

 

[myatia]

Thanks! I knew I had to do something like that, but I couldn't remember where to change it.

Misty