collision

We have a package that ends with exception e.g. package a.b.c.exception; Our code base had no issues up till eclipse 3.3, however when we shifted to eclipse 3.4, it started giving errors related to this package: "The package a.b.c.exception collides with a type" When I refactor the package name to a.b.c.exceptions, there are no issues. Is this due to a bug in eclipse 3.4 or is there some setting to rectify this behavior? It's because you have a class named exception (with a lower case "e") in the a.b.c package and a package named a.b.c.exception . It causes a name collision because if you have

var keys = new Array(); var direction; var direction; var iNr = 0; $(document).ready(function(){ looper(); $("#demo1").css("margin-top", 400 + "px"); $("#demo2").css("margin-left", 380 + "px"); myFunction(); }); function myFunction() { iNr = iNr + 0.5; $("#main").css("transition","all 0.1s"); $("#main").css("transform","rotate(" + iNr + "deg)"); setTimeout(function() { myFunction(); }, 50); } function looper() { var p =$("#circle"); var offset = p.offset(); var t =$(".red"); var roffset = t.offset(); var rect1 = {x: offset.left, y: offset.top, width: p.width(), height: p.height()} var rect2 =

I'm making a platform game with pygame, and I would like to add gravity to it. Right now I only have a picture which moves when I press the arrow keys, and my next step would be gravity. Here's my code: import pygame, sys from pygame.locals import * pygame.init() FPS = 30 fpsClock = pygame.time.Clock() DISPLAYSURF = pygame.display.set_mode((400, 300), 0, 32) pygame.display.set_caption("Jadatja") WHITE = (255, 255, 255) catImg = pygame.image.load("images/cat.png") catx = 10 caty = 10 movingRight = False movingDown = False movingLeft = False movingUp = False while True: #main game loop #update

I am writing a designer that enables the user to drag controls around the screen. What would be the best way of detecting if a control is overlapping another control while i am dragging the one control around? Should i just get the dimensions of the FrameworkElement and keep on checking the dimensions of the other elements? Thanks. Eli bitbonk The dimension (FrameworkElement.ActualWidth FrameworkElement.ActualHeight) and postion (Canvas.Top, Canvas.Bottom,Canvas.Left, Canvas.Right) of your elements would suffice if they are always rectangular. In that case you can easily calculate if two

I'm aware of how to check if two circles are intersecting one another. However, sometimes the circles move too fast and end up avoiding collision on the next frame. My current solution to the problem is to check circle-circle collision an arbitrary amount of times between the previous position and it's current position. Is there a mathematical way to find the time it takes for the two circle to collide? If I was able to get that time value, I could move the circle to the position at that time and then collide them at that point. Edit: Constant Velocity I'm assuming the motion of the circles is

I'm trying to find a safe way to prevent a cron job collision (ie. prevent it from running if another instance is already running). Some options I've found recommend using a lock on a file. Is that really a safe option? What would happen if the script dies for example? Will the lock remain? Are there other ways of doing this? zerkms This sample was taken at http://php.net/flock and changed a little and this is a correct way to do what you want: $fp = fopen(sys_get_temp_dir().DIRECTORY_SEPARATOR."lock.txt", "w+"); if (flock($fp, LOCK_EX | LOCK_NB)) { // do an exclusive lock // do the work flock

I want a sprite to delete itself when touching another sprite. Right now when they touch, they just push each other. I have this: let alphaCategory: UInt32 = 0x1 << 0 let betaCategory: UInt32 = 0x1 << 1 I made the sprites dynamic and not affected by gravity self.physicsworld.contactDelegate = self alpha.physicsBody?.categoryBitMask = alphaCategory alpha.physicsBody?.contactTestBitmask = betaCategory and beta.physicsBody?.categoryBitMask = betaCategory beta.physicsBody?.contactTestBitmask = alphaCategory I couldn't find anything in swift that made sense to me, but I think the problem is here

I've been reading a bit about Java String class' hashcode here recently, and I haven't been able to find this information : what happens when string's length is higher than 32 (I know an overflow then happens, but as a hash key, what happens)? For example, I need to hash strings that are between 20 and 120 characters long to use them as hash keys. Do I need to implement my own algorithm using BigInteger? Also, since I might have between 30k and 80k strings, maybe more, is usual String hashcode collision-free enough? (I know an overflow then happens, but as a hash key, what happens)? In Java,

How do I find collisions between characters and images within PyGame? I have drawn a player from an image, and have drawn the walls from tiles, so how would I detect these collisions? If you use the pygame Rect class to represent the boundaries of your object, you can detect whether two are colliding by using the Rect.colliderect function. For example: import pygame a = pygame.Rect((1, 1), (2, 2)) b = pygame.Rect((0, 0), (2, 2)) c = pygame.Rect((0, 0), (1, 1)) a.colliderect(b) # 1 a.colliderect(c) # 0 b.colliderect(c) # 1 a is colliding with b, and b is colliding with c, but a is not colliding