Thanks Glen - this sounds like another good solution. I assume this would work when the polygon is just a single line?
-----Original Message----- From: flashcoders-boun...@chattyfig.figleaf.com [mailto:flashcoders-boun...@chattyfig.figleaf.com] On Behalf Of Glen Pike Sent: 16 June 2011 14:48 To: Flash Coders List Subject: Re: [Flashcoders] Detecting if line crosses movie clip Hi, Can you measure the vector distance between the centre of the polygon and the centre of the ball? If that is 0,0, and the diameter of the circle is less than the smallest of width / height of the box, then you are inside. Glen On 16/06/2011 13:58, Paul Steven wrote: > Working on a game where the player must draw around some colored balls on > screen by dragging the mouse to create the polygon that surrounds the > objects. > > The polygon is created by drawing a series of lines every time the mouse > moves. If one of these lines intersects one of the balls (movie clip) I need > to perform an action. > > So my question is how to detect when the line intersects a movie clip? > > The following is unsuitable as it treats the line as a rectangle e.g a > vertical line will have a lot of hit area that I do not want to be hit area > > if (ballMC.hitTestObject(lineMC)) { > > My other best suggestion is to use the 4 lines that make up the bounding box > of the ball movie clip and do a line intersection test for each line against > the line being drawn. This seems overly complex so before I try this I > wanted to check there is not a simpler solution. > > Thanks in advance > > > > _______________________________________________ > Flashcoders mailing list > Flashcoders@chattyfig.figleaf.com > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders > > ca _______________________________________________ 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
