Posted on: July 31, 2008
Note: This is almost exactly the same solution I posted earlier for rotating an object around its center point (Actionscript 3.0: Rotate Around Center Point). I thought I’d post this slightly altered solution for people who need it.
Problem:
You need to scale a movieclip/sprite from its center point, but its registration point is at (0,0) and you can’t and/or don’t feel like putting this object in the center of a container movieclip and rotating that
Solution:
TCBWMO (Take care of business with the matrix object).
(more…)Category: Actionscript, Flash
Posted on: July 21, 2008
Problem:
You’re working some math equations with Actionscript and tracing the results when you notice some results are off by a very small value.
output:
2
2.1
2.2
2.3
2.4
2.5000000001
2.6
2.7000000001
2.8
2.9
3
Solution:
This is called a floating point error and is apparently a normal computing error that affects all aspects of computing, not just flash. You can fix this by running the values through the correctFloatingPointError function I’ve posted below.
(more…)Category: Actionscript, Flash
Posted on:
Recently I got back into Flash and began to learn Actionscript 3.0. Things have definitely come a long way in the last few years, and I’ve become interested in Adobe’s quest to turn the Flash format into a full fledged rich internet application framework of sorts. I’m surprised, and personally impressed on how far all this has come. Here’s a couple things I’ve come to realize (or knew about, but never dived into) in the last year or so:
(more…)Category: Flash
Posted on:
Problem:
You need to rotate a movieclip/sprite around it’s center point, but its registration point is at (0,0) and you can’t and/or don’t feel like putting this object in the center of a container movieclip and rotating that.
Solution:
Use the transform matrix and show it who’s boss.
If you want to get this done simply and quickly, you can use this rotateAroundCenter function:
private function rotateAroundCenter (ob:*, angleDegrees:Number, ptRotationPoint:Point) {
var m:Matrix=ob.transform.matrix;
m.tx -= ptRotationPoint.x;
m.ty -= ptRotationPoint.y;
m.rotate (angleDegrees*(Math.PI/180));
m.tx += ptRotationPoint.x;
m.ty += ptRotationPoint.y;
ob.transform.matrix=m;
}Category: Actionscript, Flash
