[英]randomly distribute sprites
我定義了:
#define kNumAstroids 15
和雪碧添加
_robbers = [[CCArray alloc] initWithCapacity:kNumAstroids];
for (int i = 0; i < kNumAstroids; ++i) {
CCSprite *asteroid = [CCSprite spriteWithSpriteFrameName:@"robber.png"];
asteroid.visible = NO;
[_batchNode addChild:asteroid];
[_robbers addObject:asteroid];
更新方式
double curTime = CACurrentMediaTime();
if (curTime > _nextRunemanSpawn) {
float randSecs = [self randomValueBetween:0.20 andValue:1.0];
_nextRunemanSpawn = randSecs + curTime;
float randY = 80.0;
float randY1 = 185.0;
float randY2 = 290.0;
float randDuration = [self randomValueBetween:4.0 andValue:4.0];
float randDuration1 = [self randomValueBetween:1.0 andValue:1.0];
CCSprite *asteroid = [_robbers objectAtIndex:_nextRobber];
_nextRobber++;
if (_nextRobber >= _robbers.count) {
_nextRobber = 0;
}
//[asteroid stopAllActions];
asteroid.position = ccp(winSize.width +asteroid.contentSize.width / 2 , randY);
asteroid.visible = YES;
[asteroid runAction:[CCSequence actions:[CCMoveBy actionWithDuration:randDuration position:ccp(-winSize.width-asteroid.contentSize.width, 0)],
[CCCallFuncN actionWithTarget:self selector:@selector(setInvisible:)],nil]];
我想在randY,randY1和randY2之間隨機分布這些精靈
我可以使用arc4random()
函數嗎? 如果可以,怎么辦?
使用arc4random()查找您的隨機Y pos
float random_Y = randY + arc4random() % randY2;
然后在代碼中使用random_Y值
if (curTime > _nextRunemanSpawn)
{
float randSecs = [self randomValueBetween:0.20 andValue:1.0];
_nextRunemanSpawn = randSecs + curTime;
float randY = 80.0;
float randY1 = 185.0;
float randY2 = 290.0;
float randDuration = [self randomValueBetween:4.0 andValue:4.0];
float randDuration1 = [self randomValueBetween:1.0 andValue:1.0];
CCSprite *asteroid = [_robbers objectAtIndex:_nextRobber];
_nextRobber++;
if (_nextRobber >= _robbers.count) {
_nextRobber = 0;
}
//[asteroid stopAllActions];
asteroid.position = ccp(winSize.width +asteroid.contentSize.width / 2 , random_Y);//in this place
asteroid.visible = YES;}
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