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 06-19-2013, 08:57 AM PM User | #1 damenhannah New to the CF scene   Join Date: Jun 2013 Posts: 4 Thanks: 1 Thanked 0 Times in 0 Posts Jumping/Gravity in Game I've been trying to use the set interval in JavaScript, but I can't figure out how to make a jump which gradually decreases the y increase rate then incrementally increases the decrease rate of y. Code: ``` if (key == 32) //space { setInterval(function(){jump()},1000); } function jump() { var d=y+100; document.getElementById('player').style.marginTop=y+'px'; }```
 06-19-2013, 10:20 AM PM User | #2 Logic Ali Senior Coder     Join Date: Sep 2010 Location: London Posts: 1,026 Thanks: 0 Thanked 206 Times in 201 Posts You need a permanent variable to store the initial vertical velocity. On each iteration, the velocity is decreased by a fixed amount representing acceleration due to gravity. Eventually the velocity becomes negative. Continue until the position equals the starting point, below which you must not drop. I would use setTimeout instead, so you don't have to cancel the interval.
 06-19-2013, 01:42 PM PM User | #3 007julien Regular Coder   Join Date: May 2012 Location: France Posts: 174 Thanks: 0 Thanked 27 Times in 25 Posts See the source of this Ball bounce page
 06-19-2013, 03:15 PM PM User | #4 vwphillips Senior Coder   Join Date: Mar 2005 Location: Portsmouth UK Posts: 4,430 Thanks: 3 Thanked 480 Times in 467 Posts Code: ```
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