[Flashcoders] Q:creating a 'snappable' class
Hi I'm creating a 'snappable' class, that would work with a predefined set of x,y pairs or 'hotspots'. When a dragged movieclip was within a 'offset' distance of any of these hotspots it would 'snap to' and stop drag. The best way of doing this I thought would be to simply pass an array of predefined x,y pairs as an object into the class when it was instantiated. However, having to cycle thru an array, especially if there are a huge number of 'hotspots', while dragging doesn't seem very efficientcan anyone suggest a better way of approaching this? Thanks in advance Jim Bachalo [e] jbach at bitstream.ca [c] 416.668.0034 [w] www.bitstream.ca "...all improvisation is life in search of a style." - Bruce Mau,'LifeStyle' ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Re: [Flashcoders] Q:creating a 'snappable' class
Hi Jim, Are these hotspots "connected" to each other by arising from one single function? Like, are they equally spaced, (as on a grid), follow the perimeter of a circle or any other math function? My guess would be no, so... There can't be any way other than looping through hotspots to see if you are near one. One thing that might be of help though is Grand Skinner's Proximity class. It might be able to save you lots of calculations, since you could only check for hotspots that are near a specified area. You might want to check that out. Just a thought... Dimitrios Bendilas - Original Message - From: <[EMAIL PROTECTED]> To: Sent: Friday, February 03, 2006 10:32 PM Subject: [Flashcoders] Q:creating a 'snappable' class Hi I'm creating a 'snappable' class, that would work with a predefined set of x,y pairs or 'hotspots'. When a dragged movieclip was within a 'offset' distance of any of these hotspots it would 'snap to' and stop drag. The best way of doing this I thought would be to simply pass an array of predefined x,y pairs as an object into the class when it was instantiated. However, having to cycle thru an array, especially if there are a huge number of 'hotspots', while dragging doesn't seem very efficientcan anyone suggest a better way of approaching this? Thanks in advance Jim Bachalo [e] jbach at bitstream.ca [c] 416.668.0034 [w] www.bitstream.ca "...all improvisation is life in search of a style." - Bruce Mau,'LifeStyle' ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Re: [Flashcoders] Q:creating a 'snappable' class
[EMAIL PROTECTED] wrote: Hi I'm creating a 'snappable' class, that would work with a predefined set of x,y pairs or 'hotspots'. When a dragged movieclip was within a 'offset' distance of any of these hotspots it would 'snap to' and stop drag. The best way of doing this I thought would be to simply pass an array of predefined x,y pairs as an object into the class when it was instantiated. However, having to cycle thru an array, especially if there are a huge number of 'hotspots', while dragging doesn't seem very efficientcan anyone suggest a better way of approaching this? theres a fair few spatial partitioning approaches around these days, but i guess you could do something easy with quadtrees. It depends on how many hotspots you have and what shapes the objects are etc..I think the first thing to do is some performance tests to see if checking the whole array is too expensive. If you do need them then quadtree's are quite simple, basically you divide the screen into 4, then you can recursively subdivide each section, stopping when you think you have a small enough resolution. Then when you are dragging this clip around you will only need to test for proximity to items contained within certain nodes of the tree, not everything on screen. I dont know of any AS2 implementations, but its quite fun to code :) i've found a few references that should help explain : http://www.gamedev.net/reference/articles/article1303.asp http://www.ece.eps.hw.ac.uk/~dml/cgonline/hyper00/model/spacediv.html theres even a paper on macromedia.com that covers quadtrees http://www.macromedia.com/devnet/director/articles/collision_detection/collision_detection_lingo.pdf good luck martin. ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
