Actionscript:
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var velocityInfo:TextField = new TextField();
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velocityInfo.x = 20;
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velocityInfo.y = 20;
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addChild(velocityInfo);
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var prevX:Number = mouseX;
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var prevY:Number = mouseY;
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var velX:Number = 0;
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var velY:Number = 0;
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addEventListener(Event.ENTER_FRAME, onLoop);
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function onLoop(evt:Event):void {
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velX = mouseX - prevX;
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velY = mouseY - prevY;
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velocityInfo.text = velX + ", " + velY
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prevX = mouseX;
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prevY = mouseY;
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}
Wrote this in response to a question from one of my students. The next step is to use velX and velY to push objects around the screen.
4 Comments
As someone else mentioned before, you really should post SWF examples along with these
I know the whole point is that you can paste the code into your FLA and see what it does, but sometimes I don’t have Flash open and don’t want to read the code and just see the end result, then if I’m interested in the end result I would read the code. Granted this is an easy example, but you know what I mean. Just help the lazy people out! Keep up the great work, though.
Yeah, I’ve been thinking about it… I may start doing that in the next couple weeks.
I made the site because I really like to read code… and because I found myself just reading the code on peoples blogs instead of reading what they wrote about it….
this will not calculate the mouse velocity . For velocity u need formula vel = dis/time which is vector.
Thanks for the comment Pra. I always thought of it as two vector values, one for the x and one for the y - the direction is either positive or negative on either axis and the speed is in pixels per frame… How would you use the dis/time in this example?
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