我想要一个雪粒子效果跟随我的精灵，我尝试了一些方法，但所有最终发生的事情是雪将保持静止而不是跟随。我做了这个教程（将在我找到它后立即发布），这表明它是如何用火做的，但根本没有用。任何教程或建议将不胜感激。我相信我必须在片段部分添加某种代码，然后在屏幕上创建敌人。
[self schedule:@selector(gameLogicboss:) interval:180 ];
[self schedule:@selector(updateboss:)];
-(void)addTarget1 {
Boss *target1 = nil;
if ((arc4random() % 2) == 0) {{
target1 = [WeakAndFastBoss boss];
}} else {
target1 = [WeakAndFastBoss boss];
}
// Determine where to spawn the target along the Y axis
CGSize winSize = [[CCDirector sharedDirector] winSize];
int minY = target1.contentSize.height/2;
int maxY = winSize.height - target1.contentSize.height/2;
int rangeY = maxY - minY;
int actualY = (arc4random() % rangeY) + minY;
// Create the target slightly off-screen along the right edge,
// and along a random position along the Y axis as calculated above
target1.position = ccp(winSize.width + (target1.contentSize.width/2), actualY);
[self addChild:target1 ];
// Determine speed of the target
int minDuration = target1.minMoveDuration;
int maxDuration = target1.maxMoveDuration;
int rangeDuration = maxDuration - minDuration;
int actualDuration = (arc4random() % rangeDuration) + minDuration;
// Create the actions
id actionMove = [CCMoveTo actionWithDuration:actualDuration position:ccp(-target1.contentSize.width/2, actualY)];
id actionMoveDone = [CCCallFuncN actionWithTarget:self
selector:@selector(spriteMoveFinished:)];
[target1 runAction:[CCSequence actions:actionMove, actionMoveDone, nil]];
target1.tag = 1;
[_targets addObject:target1];
}
-(void)gameLogicboss:(ccTime)dt {
[self addTarget1];
iterations_++;
}
- (void)updateboss:(ccTime)dt {
CGRect projectileRect = CGRectMake(projectile.position.x - (projectile.contentSize.width/2), projectile.position.y - (projectile.contentSize.height/2), projectile.contentSize.width, projectile.contentSize.height);
BOOL bossHit = FALSE;
NSMutableArray *targetsToDelete = [[NSMutableArray alloc] init];
for (CCSprite *target1 in _targets) {
CGRect target1Rect = CGRectMake(target1.position.x - (target1.contentSize.width/2), target1.position.y - (target1.contentSize.height/2), target1.contentSize.width, target1.contentSize.height);
if (CGRectIntersectsRect(projectileRect, target1Rect)) {
//[targetsToDelete addObject:target];
bossHit = TRUE;
Boss *boss = (Boss *)target1;
boss.hp--;
if (boss.hp <= 0) {
_score ++;
[targetsToDelete addObject:target1];
}
break;
}
}
for (CCSprite *target in targetsToDelete) {
[_targets removeObject:target];
[self removeChild:target cleanup:YES];
_projectilesDestroyed++;
if (_projectilesDestroyed > 2) {
}
}
if (bossHit) {
//[projectilesToDelete addObject:projectile];
[[SimpleAudioEngine sharedEngine] playEffect:@"explosion.caf"];
}
[targetsToDelete release];
}
-(void)spriteMoveFinishedboss:(id)sender {
CCSprite *sprite = (CCSprite *)sender;
[self removeChild:sprite cleanup:YES];
GameOverScene *gameOverScene = [GameOverScene node];
[gameOverScene.layer.label setString:@"You Lose"];
[[CCDirector sharedDirector] replaceScene:gameOverScene];
if (sprite.tag == 1) { // target
[_targets removeObject:sprite];
} else if (sprite.tag == 2) { // projectile
[_projectiles removeObject:sprite];
}
}
答案 0 :(得分：1)
您无需使用精灵更新粒子发射器的位置。 您可以将子系统作为子项添加到精灵中。 粒子系统确实需要输入：
CCParticleSystem * booster = [CCParticleSystem particleWithFile:@"boosterParticles.plist"];
//customize your particles' options
//assuming you have a sprite defined as _motherShip
[_motherShip addChild:booster];
/*
* now that the particles are the _motherShip's child, you must remember
* to set the position relative to the mothership's origin...
*/
particles.position = ccp(15,0);
...所以现在每当_motherShip.position发生变化时，助推器都会随之而来。它甚至会随船一起旋转。
答案 1 :(得分：0)
非常简单的逻辑而无需进入代码：
我生成一个精灵并给它一个位置（x，y）。 对于每个精灵，我还会产生一个CCParticleSystem，给它所需的粒子类型，产生率等。 CCParticleSystem位置现在设置为与精灵相同的（x，y）位置，并且应该在精灵的（x，y）位置更新时更新。
当精灵和CCParticleSystem四处移动时，这个位置（x，y）会按照间隔步骤时间在您的计划方法中随机获取更新。
希望这是有道理的。
答案 2 :(得分：0)
我这样做
vehicleParticleSystem = [CCParticleSystemQuad particleWithFile:@"vehicleParticle.plist"];
vehicleParticleSystem.position = ccp(_ship.position.x - _ship.contentSize.width/3, _ship.position.y - _ship.contentSize.height/3);
if (UI_USER_INTERFACE_IDIOM() != UIUserInterfaceIdiomPad) {
vehicleParticleSystem.scale = 0.5;
}
[self addChild:vehicleParticleSystem z:-1];
并使用此
更新其位置- (void) updateParticleSystem:(ccTime)dt {
vehicleParticleSystem.position = ccp(_ship.position.x - _ship.contentSize.width/3, _ship.position.y - _ship.contentSize.height/3);
}
在-(void) update:(ccTime)dt方法中调用。
用户通过游戏手柄移动船只。
希望这会有所帮助。对于发动机效应，颗粒的定位稍微落后于车辆。答案 3 :(得分：0)
我在CCParticleSystem.h找到了这个。
/** @typedef tCCPositionType
possible types of particle positions
/
typedef enum {
/* Living particles are attached to the world and are unaffected by emitter repositioning. */
kCCPositionTypeFree,
/** Living particles are attached to the world but will follow the emitter repositioning.
Use case: Attach an emitter to an sprite, and you want that the emitter follows the sprite.
*/
kCCPositionTypeRelative,
/** Living particles are attached to the emitter and are translated along with it. */
kCCPositionTypeGrouped,
you should set it like
myparticleSystem.positionType=kCCPositionTypeGrouped;
希望它有所帮助。
答案 4 :(得分：0)
您是否尝试使用更新方法更新粒子位置？
我在我的一个游戏中做了类似以下几行的事情，它的工作原理我认为你期待
-(void) update:(CCTime)delta{
_sprite.position = CGPointMake(newXPosition, newYPosition);
_fire.position = CGPointMake(_sprite.position.x, _sprite.position.y);
}
我希望它有所帮助！