AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Negative MouseEvent          AppletTalk.com Forum Index -> Java Help View previous topic :: View next topic   Author Message Grethe Guest Posted: Thu Feb 16, 2006 1:12 pm    Post subject: Negative MouseEvent Hi I'm having a bit of trouble understanding MouseEvent. For some reason I'm able to make it return a negative point on mousePressed when printing out getPoint. How is this possible? I dont see how it is possible to trigger a MouseEvent on a component that has a MouseListener without the clicking point being inside the component. Im using java 1.1.8(Don't ask why). Is this a bug in Java 1.1? java.awt.Point[x=-17,y=38] Mike Back to top Rhino Guest Posted: Thu Feb 16, 2006 3:12 pm    Post subject: Re: Negative MouseEvent "Grethe" <no (AT) spam (DOT) com> wrote in message news:43f475ed$0$6849$d40e179e (AT) nntp02 (DOT) dk.telia.net... Quote: Hi I'm having a bit of trouble understanding MouseEvent. For some reason I'm able to make it return a negative point on mousePressed when printing out getPoint. How is this possible? I dont see how it is possible to trigger a MouseEvent on a component that has a MouseListener without the clicking point being inside the component. Im using java 1.1.8(Don't ask why). Is this a bug in Java 1.1? java.awt.Point[x=-17,y=38] The coordinate system is based on the default origin, (0,0), being in the upper left corner. That results in both the X and Y coordinates of any point being positive since every point south or east of the origin has a higher X or Y coordinate than zero. But there is a method, translate(), that can change the origin to some other point. Is it possible that your code does a translate()? That could explain your results. -- Rhino Back to top Mike Guest Posted: Thu Feb 16, 2006 3:12 pm    Post subject: Re: Negative MouseEvent Quote: But there is a method, translate(), that can change the origin to some other point. Is it possible that your code does a translate()? That could explain your results. My code does not use translate at any point. If translate is used it is done within AWT. But the thing is that im not doing anything to change the result. It's the point directly from the event thats negative. I strongly suspect its a bug since java 1.1 is very buggy. Its no problem fixing it. I just make sure to check for negative values. But since in my mind it shouldnt be possible to get a negative value from mousePressed i think its a bug. Mike Back to top Monique Y. Mudama Guest Posted: Thu Feb 16, 2006 6:12 pm    Post subject: Re: Negative MouseEvent On 2006-02-16, Mike penned: Quote: But there is a method, translate(), that can change the origin to some other point. Is it possible that your code does a translate()? That could explain your results. My code does not use translate at any point. If translate is used it is done within AWT. But the thing is that im not doing anything to change the result. It's the point directly from the event thats negative. I strongly suspect its a bug since java 1.1 is very buggy. Its no problem fixing it. I just make sure to check for negative values. But since in my mind it shouldnt be possible to get a negative value from mousePressed i think its a bug. Having to use 1.1 is like having to code with your hands tied behind your back. -- monique Ask smart questions, get good answers: http://www.catb.org/~esr/faqs/smart-questions.html Back to top Roedy Green Guest Posted: Fri Feb 17, 2006 5:12 am    Post subject: Re: Negative MouseEvent On Thu, 16 Feb 2006 09:15:48 -0500, "Rhino" <no.offline.contact.please (AT) nospam (DOT) com> wrote, quoted or indirectly quoted someone who said : Quote: The coordinate system is based on the default origin, (0,0), being in the upper left corner. That results in both the X and Y coordinates of any point being positive since every point south or east of the origin has a higher X or Y coordinate than zero. see http://mindprod.com/jgloss/coordinates.html for a pictorial explanation -- Canadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. Back to top Mike Guest Posted: Fri Feb 17, 2006 12:12 pm    Post subject: Re: Negative MouseEvent Quote: Having to use 1.1 is like having to code with your hands tied behind your back. agreed. however i have no choice since its my job:\ Mike Back to top Mike Guest Posted: Fri Feb 17, 2006 12:12 pm    Post subject: Re: Negative MouseEvent Quote: see http://mindprod.com/jgloss/coordinates.html for a pictorial explanation The problem is not wether i understand how coordinates work i java. The question is: is it possible to get a negative point when mousePressed is called or is this a bug in java 1.1? Back to top Roedy Green Guest Posted: Sat Feb 18, 2006 1:12 am    Post subject: Re: Negative MouseEvent On Fri, 17 Feb 2006 12:27:51 +0100, "Mike" <no (AT) spam (DOT) com> wrote, quoted or indirectly quoted someone who said : Quote: The problem is not wether i understand how coordinates work i java. The question is: is it possible to get a negative point when mousePressed is called or is this a bug in java 1.1? A could see a negative point occurring like this. A mouse click comes in. Through magical processes it arrives at the Container. The container looks at the bounds of all its contents and picks the one containing the point. If it can't find one it has to deal with it itself. It then selects triggers the event handler of the content component with the x,y adjusted to be relative to the component. What could happen to screw this up? Mainly a second thread meddling, say moving or resizing components while the container was in the process of dispatching the event. -- Canadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. Back to top Mike Guest Posted: Sat Feb 18, 2006 11:12 am    Post subject: Re: Negative MouseEvent Quote: A could see a negative point occurring like this. A mouse click comes in. Through magical processes it arrives at the Container. The container looks at the bounds of all its contents and picks the one containing the point. If it can't find one it has to deal with it itself. It then selects triggers the event handler of the content component with the x,y adjusted to be relative to the component. What could happen to screw this up? Mainly a second thread meddling, say moving or resizing components while the container was in the process of dispatching the event. Interesting point. Actually it occurs while moving(animating) an object. So basically its a synchronization issue? Im still a bit puzzled about how it can occur. I would like java to be able to handle this synchronization issue. But am i wrong in assuming that? Mike. 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