我有一个小应用程序,我有几个使用 MotionManager.gravity 在板上移动的精灵“球”。
我有代码,当任何一个球遇到边缘时,就会在边缘停止。如果任何一个球到达角落,它也会停在角落里。我还编写了代码,其中如果两个或三个球在任何一个边缘上并相互接触(它们打开了碰撞检测),它们就会停下来,保持它们与另一个球的相对位置。
这是我的代码:
//这会分配motionManager并设置重力值。
self.motionManager = [[CMMotionManager alloc] init];
self.motionManager.deviceMotionUpdateInterval = 0.005f;
self.motionQueue = [[NSOperationQueue alloc] init];
self.motionQueue.name = [[[NSBundle mainBundle] bundleIdentifier] stringByAppendingString:@".motion"];
self.updatePosition = NO;
[self.motionManager startDeviceMotionUpdatesToQueue:self.motionQueue withHandler:^(CMDeviceMotion *motion, NSError *error) {
@synchronized(self) {
NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
[formatter setMaximumFractionDigits:2];
[formatter setRoundingMode: NSNumberFormatterRoundUp];
{
_numberString = [formatter stringFromNumber:[NSNumber numberWithFloat:motion.gravity.x / 15.0 *200]];
_numberStringy = [formatter stringFromNumber:[NSNumber numberWithFloat:motion.gravity.y / 15.0 *200]];
n = [_numberString intValue];
y = [_numberStringy intValue];
}
self.gravity = motion.gravity;
self.updatePosition = YES;
}
}];
[self startDisplayLink];
//这显示了我如何将球停在边缘
- (void)handleDisplayLink:(CADisplayLink *)displayLink
{
@synchronized(self) {
if (!self.updatePosition)
return;
self.ball.position = CGPointMake(self.ball.position.x + (n*.99), self.ball.position.y + (y*.99));
self.ball2.position = CGPointMake(self.ball2.position.x + (n*.98), self.ball2.position.y +(y*.98));
self.ball3.position = CGPointMake(self.ball3.position.x + n, self.ball3.position.y + y);
if (ball.position.x <=340) {
ball.position = CGPointMake(340, ball.position.y);
}
if (ball.position.x >=684) {
ball.position = CGPointMake(684, ball.position.y);
}
if (ball.position.y <=148) {
ball.position = CGPointMake( ball.position.x,148);
}
if (ball.position.y >=620) {
ball.position = CGPointMake(ball.position.x,620);
}
//这会把它停在角落里
if ( ball.position.x >=684 && ball.position.y <=148 ) {
ball.position = CGPointMake(684, 148);
}
if ( ball.position.x >=684 && ball.position.y >=620 ) {
ball.position = CGPointMake(684, 620);
}
if ( ball.position.x <=340 && ball.position.y <=148 ) {
ball.position = CGPointMake(340, 148);
}
if ( ball.position.x <=340 && ball.position.y >=620 ) {
ball.position = CGPointMake(340, 620);
}
//这显示了我是如何设置的,如果它们在一侧并且球1在角落里,球2在下一个球3在下一个,它们保持它们的相对位置。我想如果我设置角球并且其余的都打开了碰撞检测,他们就会停下来。他们这样做了,但他们将角落里的 ball1 推到了它的位置之外。所以我写了代码
if (ball2.position.y == ball3.position.y && ball.position.y == ball2.position.y && ball.position.x < ball2.position.x && ball2.position.x < ball3.position.x ) {
int s = (self.ball3.position.x - self.ball2.position.x);
int t = ((self.ball2.position.y - self.ball3.position.y));
k = t + s;
int f =(self.ball2.position.x - self.ball.position.x);
int g = ((self.ball2.position.y - self.ball.position.y));
j = f+g;
int h =(self.ball3.position.x - self.ball.position.x);
int i = ((self.ball3.position.y - self.ball.position.y));
l = h + i;
NSLog(@"ball2centerx:%f",ball2.position.x);
NSLog(@"ball2centery:%f",ball2.position.y);
NSLog(@"ballcenterx:%f",ball.position.x);
NSLog(@"ballcentery:%f",ball.position.y);
NSLog(@"ball3centerx:%f",ball3.position.x);
NSLog(@"ball3centery:%f",ball3.position.y);
CGPoint w = CGPointMake(340, 148);
CGPoint x = CGPointMake(340, 620);
CGPoint v = CGPointMake(684, 148);
CGPoint z = CGPointMake(684, 620);
CGPoint m = CGPointMake(370, 148);
CGPoint q = CGPointMake(370, 620);
CGPoint o = CGPointMake(654, 148);
CGPoint p = CGPointMake(654, 620);
if (CGPointEqualToPoint(ball.position,w) ) {
if (f < 30) {
ball2.position = CGPointMake(370, 148);
}
}
if (CGPointEqualToPoint(ball.position,x)) {
if (f<30) {
ball2.position = CGPointMake(370, 620);
}
}
if (CGPointEqualToPoint(ball3.position,v)) {
if (s <30){
ball2.position = CGPointMake(654, 148);
}
}
if (CGPointEqualToPoint(ball3.position,z)) {
if (s <30){
ball2.position = CGPointMake(654, 620);
}
}
if (CGPointEqualToPoint(ball2.position,m)) {
if (s <30){
ball3.position = CGPointMake(400, 148);
}
}
if (CGPointEqualToPoint(ball2.position,o)) {
if (f<30) {
ball.position = CGPointMake(624, 148);
}
}
if (CGPointEqualToPoint(ball2.position,q)) {
if (s <30){
ball3.position = CGPointMake(400, 620);
}
}
if (CGPointEqualToPoint(ball2.position,p)) {
if (f<30) {
ball.position = CGPointMake(624, 620);
}
}
}
问题是当我添加更多球时,代码将变得非常复杂。
有没有办法这样写,如果一个球(任何球)在角落里,而另一个球在第二个位置,它将停留在那里,依此类推。有点像所有球配置的通用代码。而不是为每个配置编写它?