I was playing with my JavaScript DHTML library - specifically the collision detection. I had a function, getDistanceFrom(), that accepted another object and returned the distance - in pixels as X and Y - between it and the primary object. But it didn't confer directionality. For example a return of "0,0" means that the corners of the objects were touching - but any of the four corners - you don't know which direction the objects lie in.
So I wanted to add the ability to get direction... which meant a lot of math I wasn't familiar with. So I finally figured it out - this is the function that (using the X,Y coordinates of the centers of the objects) determines the direction and returns a degree value to the second decimal place (from 0.00 to 359.00): Math.round( ( ( ( ( Math.atan2((TestX-ThisX),(ThisY-TestY)) ) * 180 / Math.PI ) + 360 ) % 360 ) * 100) / 100; So I made a frog! Drag the little black dot (the fly) around and his eyes will follow it. The number in the frog is the bearing of the frog from the fly: http://www.depressedpress.com/Content/Development/JavaScript/Extensions/DP_P anelManager/Example6.cfm The actual library is here: http://www.depressedpress.com/Content/Development/JavaScript/Extensions/DP_P anelManager/Index.cfm No... it's not really impressive, but it does represent a few hours of my time. ;^) Jim Davis ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Adobe® ColdFusion® 8 software 8 is the most important and dramatic release to date Get the Free Trial http://ad.doubleclick.net/clk;192386516;25150098;k Archive: http://www.houseoffusion.com/groups/CF-Community/message.cfm/messageid:259547 Subscription: http://www.houseoffusion.com/groups/CF-Community/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=11502.10531.5
