Flummoxed

I have spent many hours trying to come up with how I am supposed to think of this problem and it is annoying because I just know it is so simple, which is why I am missing it.
I have an applet with a ball object "in" a field object. The ball starts moving at a 45 degree angle and stops when it hits one of the boundaries of the field (do-while loop). No problem. Then it is supposed to bounce off the boundary at 90 degrees relative to the original vector. The thing for me is that there are 2 ways for the ball object to make contact with any given field boundary. For example, take the top boundary. The ball can hit this boundary from the left or from the right, ie., / or \. If it hits from the left it has to "bounce" off the boundary and head down-right. ie., \. If it hits from the right it has to "bounce" off the boundary and head down-left, ie., /. The end goal is to have a ball that just bounces off of the boundaries perpetually and realistically.
I know how to make the ball "bounce" (stop) when it hits the boundary by comparing Ovalx an Ovaly co-ordinates to the field dimensions. What I desparately need here is guidance as to the NATURE of the criteria that will allow me to differentiate the direction of ball movement prior to its striking a boundary. Don't want code, don't want the logic spelled out for me if possible. Just a shove in the right direction.
Thanks for your time.

If the wall's specified by line segment (x1,y1) to (x2,y2), and a ball comes in and hits with velocity (vx0,vy0)...
1. The angle of the wall is theta = Math.atan2(y2-y1,x2-x1)
2. Rotate the velocity vector by -theta
3. Scale the velocity vector by (-1,1)
4. Rotate the velocity vector by theta
The vector you get is (vxR,vyR), the new velocity of the ball. You can do all the rotations and scales with the AffineTransform class...
AffineTransform.getRotateInstance(double theta)
AffineTransform.getScaleInstance(double sx, double sy)
Notice that for the case of a horizontal wall, this has the result of (vxR = -vx0, vyR = vy0), similar for the vertical wall.
Notice also that the rotations and scales you have to do don't depend on the original velocity vector, so if you set up the bounce transformation beforehand by multiplying all the AffineTransform objects together, you can store that in the wall object as part of the data.

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    Can someone please walk me through the steps to make this work?  When I do restart, I don't even see that 50GB drive like I do when I restart the 2008 MBP so I suspect something may be wrong from the get go.  In Disk Utility, it shows the 2 partitions just fine, but not on reboot/restart with the option key held down.
    Thanks in advance for your help.

    Thanks very much for the quick reply.  I figured it would something that simple.  Like I said, I only know enough to cause trouble.  LOL
    Thanks again,  Guess I need to find a new game to play.  LOL

  • Mid 2010 macbook pro slow to sleep. No print queu issues.

    Hey everyone! My Mid 2010 macbook pro slow is slow to go to sleep. I have read several community forums and I've checked for old print jobs (which seems to be a common issue) and have found none. I've also reset all printers and jobs.  Anyways, it takes 35 to 60 seconds to go sleep (until fan/harddrive turns off/I see blinking white light).  This slow sleep occurs even with a complete fresh install of Mavericks, and even after installing a new SSD. I am honestly at a loss.
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    id:0xa00000a7a [System: DeclUser kDisp]         
    2/11/15, 9:16:49 AM EST                      Summary- [System: No Assertions] Using Batt                                         
    2/11/15, 9:37:59 AM EST  Assertions          PID 17(powerd) Created InternalPreventSleep "com.apple.powermanagement.darkwakelinger" 00:00:00  id:0xe00000bb5 [System: DeclUser SRPrevSleep kCPU kDisp]         
    2/11/15, 9:38:14 AM EST  Assertions          PID 17(powerd) TimedOut InternalPreventSleep "com.apple.powermanagement.darkwakelinger" 00:00:15  id:0xe00000bb5 [System: DeclUser SRPrevSleep kCPU kDisp]         
    2/11/15, 9:38:14 AM EST  Assertions          PID 17(powerd) Released InternalPreventSleep "com.apple.powermanagement.darkwakelinger" 00:00:15  id:0xe00000bb5 [System: DeclUser SRPrevSleep kCPU kDisp]         
    2/11/15, 9:38:14 AM EST                      Summary- [System: DeclUser kDisp] Using Batt                                        
    Sleep/Wakes since boot at 2/8/15, 8:52:21 PM EST   :18   Dark Wake Count in this sleep cycle:0
    UUID: 09576726-5A6B-4848-82C1-8613E9381C59
    2/8/15, 4:48:35 PM EST   Sleep               Software Sleep pid=59: Using BATT (Charge:67%)                             11558 secs
    2/8/15, 4:48:39 PM EST   SlowResponse        PMConnection: Response from com.apple.apsd is slow (powercaps:0x0)                   4495 ms  
    2/8/15, 4:48:39 PM EST   WakeRequests        Clients requested wake events: None                                                 
    2/8/15, 8:01:13 PM EST   Wake                Wake [CDNVA] due to EC LID0/HID Activity: Using BATT (Charge:63%)                   
    2/8/15, 8:01:13 PM EST   SlowResponse        Kernel: Response from powerd is slow (powercaps:0x0)                                 4508 ms  
    2/8/15, 8:01:43 PM EST   Assertions          PID 426(AddressBookSour) Released PreventUserIdleSystemSleep "Address Book Source Sync" 00:00:30  id:0x100000254 [System: DeclUser kDisp]         
    2/8/15, 8:01:43 PM EST   Assertions          PID 171(UserEventAgent) Released BackgroundTask "com.apple.AddressBook.ScheduledSync" 00:00:30  id:0xc00000255 [System: DeclUser kDisp]         
    Does anybody have any ideas? Fixes? I am flummoxed.  Thanks!

         Reset PRAM.  http://support.apple.com/kb/PH18761
         Reset SMC.     http://support.apple.com/kb/HT3964
       Choose the method for:
       "Resetting SMC on portables with a battery you should not remove on your own".
          Start up in Safe Mode.  http://support.apple.com/kb/PH14204?viewlocale=en_US
      Best.

  • Upgrade or replace mid-2009 MBP for 4 year doc program

    My question:
    I'm new to this forum - thanks in advance for your help!
    I love my 5 year old MBP, and I loved the one I had for 5 years before it. I assumed I would buy a new one for this doctoral program that starts in 10 days, which I expect will take 3-4 years to complete. I am flummoxed by what Apple has done with the MBP line (SSD drives with tiny storage capabilities, retina displays I worry will prompt massive storage needs as apps upgrade to take advantage of them, and most offensively the soldering of HD and RAM to the motherboard), and really questioning whether any of the machines they are now selling will be useful to me during my 4 years at school. I am leaning toward buying the maxed out version of the last non-retina model while I still can.
    Should I upgrade my existing machine (hard drive, OS, what else?) or buy that last MBP model that isn't soldered shut before they discontinue it (and maybe upgrade it anyways)? Will the new machine be significantly better, or even more upgradeable, than my current one?
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    About my current machine:
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    Battery life: It isn't awesome. It's sufficient but waning for sure.
    I spilled water on him: This just happened recently and right afterward I noticed that the track pad is a bit buggy now. It is just a little off of what I expect it to be and sometimes refuses to let me navigate. I haven't tried my wireless mouse since that happened but I imagine that will work fine, and I'm hoping it will go back to normal (open to suggestions to fix that for sure!) soon.
    Google Chrome crashes: This has been recent. I've had 20+ tabs open and seen crashes somewhat often. I didn't have this problem before.
    He runs hot: I think this is worse since the 2011 upgrades, but honestly doesn't bother me as long as he's safe to use.
    He runs loud sometimes: I can hear the fans pick up and kick in sometimes when he's working hard, but it doesn't bother me too much.
    Glossy screen is obnoxious: I never bought an anti-glare screen cover to deal with this as I had originally planned. And no, I still don't want a retina MBP.
    Possible physical damage from rough handling: I have been rough with him over the years without a case and I worry that he is on his way to some type of physical damage that hasn't shown up yet.
    My current machine:
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    Processor 2.26 GHz Intel Core 2 Duo
    Memory  8 GB 1067 MHz DDR3
      2X Size: 4 GB
      Type: DDR3
      Speed: 1067 MHz
      Status: OK
    Graphics  NVIDIA GeForce 9400M 256 MB
    Serial Number  WQ9240Y466D
    Software  OS X 10.8.5 (12F45)
    NVidia MCP79 AHCI - Hitachi HTS545016B9SA02:
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      Model: Hitachi HTS545016B9SA02    
      Full to the brim and overflowing      
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    I am considering purchasing this machine:
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    Available to ship: 1-3 business days
    Hardware
    2.9GHz Dual-core Intel Core i7, Turbo Boost up to 3.6GHz
    8GB 1600MHz DDR3 SDRAM — 2x4GB
    1TB Serial ATA Drive @ 5400 rpm
    SuperDrive 8x (DVD±R DL/DVD±RW/CD-RW)
    Backlit Keyboard (English) & User's Guide
    Accessory Kit

    Whygirl,
    it reads as though an internal disk upgrade (and possibly a battery replacement) would suffice for you, and those two together would be far less expensive than a new MacBook Pro. Yes, you could install either a HDD or a SSD in place of its current internal HDD. You could look at the Hitachi Travelstar 7K1000 as an example of a suitable 1 TB HDD; SSDs are more expensive per unit of storage than a HDD, but might be worth the extra cost if your apps are disk-bound. (I put a Samsung 840 PRO into my 13-inch Mid 2010 model, and it’s been working well.) Note that Chrome might be responsible for the extra heat (and the extra heat is responsible for the increased volume from the fans kicking in); Chrome isn’t optimized for use on 64-bit versions of OS X, like 10.8.5.

  • Moving some Inbox Emails to subfolders leaves a duplicate copy in the inbox

    Hi All hope you can offer some advice on this strange issue we are having.
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    Kind Regards
    Stuart 

    Hi -
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    Remember this only happens on some emails in the inbox ....some emails move just fine.
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    Stuart
    Stuart Smith

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