Detecting intersections between rectangles and circles
Hello,
I'm experimenting with collision detection for a game I plan to make. I'm looking into the Rectangle class because it has an intersects() method that would be great for detecting collisions. But now I'm wondering a couple things:
1) Searching through the swing and awt APIs, I have not found an equivalent class for circles. Is there one or something like it?
2) The intersects() method for the Rectangle class seems to require another Rectangle (or rectangular coordinates and dimensions). There isn't anything equivalent to testing for intersection with a circle is there?
Note: This thread was originally posted in the Abstract Window Toolkit (AWT) forum, but moved to this forum for closer topic alignment.Thanks for moving it. I was torn between this forum and the AWT one. Now I know that questions about the Rectangle, Ellipse2D, Shape, etc. classes belong here.
Check out java.awt.geom.Areadb>
Anything that derives from the Shape interface will likely work, including Ellipse2D, the class you're likely looking for.Interface Shape
Class Ellipse2D
Class Ellipse2D.Double
>
These are great classes to know about. Thanks.
So I can created a bounding "box" for a circular entity using Ellipse2D and it has the method intersects(double x, double y, double w, double h) which tells me whether the specified rectangle intersects this ellipse.
However, I'm not finding a counterpart for this for Rectangles (i.e. something like Rectangle.intersects(Ellipse)).
On the other hand, I'm wondering if this will work instead (and if it does, it should work for detecting intersections of any shape with any shape):
1) Create two Area objects from my Rectangle and my Ellipse2D.
2) call Area1.intersect(Area2)
Area1 will now be the intersection between it's previous state and that of Area2. Therefore, if they did indeed intersect, the new area should be non-zero; otherwise, zero. Therefore...
3) call Area1.isEmpty();
If original Areas did intersect, this should return false; true otherwsie.
The only thing I'm not sure about is whether this is in fact what Area.isEmpty() computes. The description in the API doc is not all that clear:
Tests whether this Area object encloses any area.which sounds like it returns true is the enclosed area is zero, which would be the case if the original Areas didn't intersect.
Am I on the right track?
Edited by: gib65 on Jul 5, 2010 9:01 AM
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If I create a new group using the option "create group from selected contacts" those contacts are synced to iCloud but the name of the group is again only "new group". Contacts added later to that group also don't sync.
Worst of all, everything that does not sync to iCloud, is lost once I close the Contacts app, meaning this information is not even stored on my MPB. OS X does not display any error messages. However, looking into the console, I found this message repeatedly whenever I was making changes to contacts etc (not only upon closing the app):
21.10.14 17:12:46,786 Contacts[532]: Error saving address book: Error Domain=NSCocoaErrorDomain Code=1560 "Bei der Überprüfung sind mehrere Fehler aufgetreten." [TRANSLATION: "Multiple errors occurred during verification"] UserInfo=0x600002e75500 {NSDetailedErrors=(
"Error Domain=NSCocoaErrorDomain Code=1570 \"originalLine ist ein erforderlicher Wert.\" [TRANSLATION: "originalLine is a required value"] UserInfo=0x600003072180 {NSValidationErrorKey=originalLine, NSLocalizedDescription=originalLine ist ein erforderlicher Wert., [TRANSLATION: NSLocalizedDescription=originalLine is a required value.] NSValidationErrorObject=<NSManagedObject: 0x600000ab6ec0> (entity: ABCDUnknownProperty; id: 0x60000102b9e0 <x-coredata:///ABCDUnknownProperty/tFFBA3874-332E-45E1-AD9D-C743B61BD9148226> ; data: {\n originalLine = nil;\n owner = \"0x56b4002ab <x-coredata://606A6059-A9DE-42A2-91C2-BBCDADB20C77/ABCDContact/p5549>\";\n propertyName = \"X-MS-OL-DESIGN\";\n})}",
"Error Domain=NSCocoaErrorDomain Code=1570 \"originalLine ist ein erforderlicher Wert.\" [TRANSLATION: "originalLine is a required value"] UserInfo=0x600003462f40 {NSValidationErrorKey=originalLine, NSLocalizedDescription=originalLine ist ein erforderlicher Wert., [TRANSLATION: NSLocalizedDescription=originalLine is a required value.] NSValidationErrorObject=<NSManagedObject: 0x6000006bede0> (entity: ABCDUnknownProperty; id: 0x600000c3d300 <x-coredata:///ABCDUnknownProperty/tFFBA3874-332E-45E1-AD9D-C743B61BD9148152> ; data: {\n originalLine = nil;\n owner = \"0x56a0002ab <x-coredata://606A6059-A9DE-42A2-91C2-BBCDADB20C77/ABCDContact/p5544>\";\n propertyName = \"X-MS-OL-DESIGN\";\n})}"
21.10.14 17:12:46,788 Contacts[532]: -[ABAddressBook save] failed. (<ABAddressBook: 0x6080020c4130>)
21.10.14 17:12:46,788 Contacts[532]: [CardDAVPlugin-ERROR] -doSyncWithServer: [syncAddressBook(<ABAddressBook: 0x6080020c4130>) save] FAILED
Does anyone have an idea how to fix this?
I am not sure about the relevance of these error messages but I found them as well in the console:
21.10.14 17:46:36,619 uxipm_ui[745]: WARNING: The Gestalt selector gestaltSystemVersion is returning 10.9.0 instead of 10.10.0. Use NSProcessInfo's operatingSystemVersion property to get correct system version number.
Call location:
21.10.14 17:46:36,619 uxipm_ui[745]: 0 CarbonCore 0x00007fff934f2dc3 ___Gestalt_SystemVersion_block_invoke + 113
21.10.14 17:46:36,620 uxipm_ui[745]: 1 libdispatch.dylib 0x00007fff92302c13 _dispatch_client_callout + 8
21.10.14 17:46:36,620 uxipm_ui[745]: 2 libdispatch.dylib 0x00007fff92302b26 dispatch_once_f + 117
21.10.14 17:46:36,620 uxipm_ui[745]: 3 CarbonCore 0x00007fff9349b4da _Gestalt_SystemVersion + 987
21.10.14 17:46:36,620 uxipm_ui[745]: 4 CarbonCore 0x00007fff9349b0c7 Gestalt + 144
21.10.14 17:46:36,620 uxipm_ui[745]: 5 QtCore 0x000000010c089496 _ZN9QInternal16registerCallbackENS_8CallbackEPFbPPvE + 194
21.10.14 17:46:36,620 uxipm_ui[745]: 6 ??? 0x00007fff64845ceb 0x0 + 140734879784171
And also this one:
21.10.14 17:46:35,098 CoreServicesUIAgent[322]: unexpected message <OS_xpc_error: <error: 0x7fff79579c60> { count = 1, contents =
"XPCErrorDescription" => <string: 0x7fff79579f70> { length = 18, contents = "Connection invalid" }
}>
And this one:
21.10.14 17:42:42,115 com.apple.iCloudHelper[737]: objc[737]: Class FALogging is implemented in both /System/Library/PrivateFrameworks/FamilyCircle.framework/Versions/A/FamilyCircl e and /System/Library/PrivateFrameworks/FamilyNotification.framework/Versions/A/Famil yNotification. One of the two will be used. Which one is undefined.
21.10.14 17:42:42,121 com.apple.xpc.launchd[1]: (com.apple.imfoundation.IMRemoteURLConnectionAgent) The _DirtyJetsamMemoryLimit key is not available on this platform.
I have tried the troubleshooting listed here: Get help using iCloud Contacts (i.e. disabled and reenabled the sycn through iCloud in Preferences > iCloud and checked the login information etc)
And I also do not exceed any of the limits for contacts listed here: iCloud: Limits for Contacts, Calendars, Reminders, and Bookmarks
Any help is greatly appreciated!I don't know if this is applicable for you, but this solved it for me.
My initial situation was the following, Ipad, Iphone and iMac where syncing well. But not my Macbook Pro. So I did this Get help using iCloud Contacts - Apple Support and this Sync Services: Advanced troubleshooting for contact and calendar syncing - Apple Support . As result all my contacts, even the view I had where gone on my macbook. I tried rebooting and restartting but nothing helped.
Then I did the following. I backuped all the cards from contacts on my imac (by moving them into a folder) and backuped them by export as archive.
Afterwards I disconnected from icloud on my imac, then reconected and deleted all contacts from the addressbook. I double checked if they where gone on icloud.com too. Afterwards I just moved them back from the folder to the address book. again double checked on icloud.com and the my macbook started syncing properly.
Which of the things I finally solved it, I don't know for sure. But I assume it was the one with deleting and restoring everything on another machine.
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