我对这一切都很陌生，所以如果这是一个非常无知的问题，我深表歉意。我正在尝试制作一个炮塔，该炮塔将旋转以面对水龙头并朝该方向开火。在 Ray Wenderlich 的旋转炮塔教程中找到了一些代码，我将炮塔移动到屏幕的底部中心，并将弹丸的起点重新定位到同一点。这个位置更类似于旧的导弹指挥风格的游戏。
不幸的是，现在当我点击屏幕右侧时，武器会正确开火，但是当我点击左侧时，它会向下并向右开火，就像它以某种方式翻转命令一样。谁能帮我解决这个问题？是否有另一种编码方式，这样我就不会出现左击问题，或者我是否需要输入额外的内容来翻译坐标以便水龙头正确注册？
// Import the interfaces
#import "HelloWorldLayer.h"
#import "SimpleAudioEngine.h"
#import "GameOverLayer.h"
#import "Monster.h"
#import "LevelManager.h"
// Needed to obtain the Navigation Controller
#import "AppDelegate.h"
#pragma mark - HelloWorldLayer
// HelloWorldLayer implementation
@implementation HelloWorldLayer
// Helper class method that creates a Scene with the HelloWorldLayer as the only child.
+(CCScene *) scene
{
// 'scene' is an autorelease object.
CCScene *scene = [CCScene node];
// 'layer' is an autorelease object.
HelloWorldLayer *layer = [HelloWorldLayer node];
// add layer as a child to scene
[scene addChild: layer];
// return the scene
return scene;
}
- (void) addMonster {
//CCSprite * monster = [CCSprite spriteWithFile:@"monster.png"];
Monster * monster = nil;
if (arc4random() % 2 == 0) {
monster = [[[WeakAndFastMonster alloc] init] autorelease];
} else {
monster = [[[StrongAndSlowMonster alloc] init] autorelease];
}
// Determine where to spawn the monster along the Y axis
CGSize winSize = [CCDirector sharedDirector].winSize;
int minY = monster.contentSize.height / 2;
int maxY = winSize.height - monster.contentSize.height/2;
int rangeY = maxY - minY;
int actualY = (arc4random() % rangeY) + minY;
// Create the monster slightly off-screen along the right edge,
// and along a random position along the Y axis as calculated above
monster.position = ccp(winSize.width + monster.contentSize.width/2, actualY);
[self addChild:monster];
// Determine speed of the monster
int minDuration = monster.minMoveDuration; //2.0;
int maxDuration = monster.maxMoveDuration; //4.0;
int rangeDuration = maxDuration - minDuration;
int actualDuration = (arc4random() % rangeDuration) + minDuration;
// Create the actions
CCMoveTo * actionMove = [CCMoveTo actionWithDuration:actualDuration position:ccp(-monster.contentSize.width/2, actualY)];
CCCallBlockN * actionMoveDone = [CCCallBlockN actionWithBlock:^(CCNode *node) {
[_monsters removeObject:node];
[node removeFromParentAndCleanup:YES];
CCScene *gameOverScene = [GameOverLayer sceneWithWon:NO];
[[CCDirector sharedDirector] replaceScene:gameOverScene];
}];
[monster runAction:[CCSequence actions:actionMove, actionMoveDone, nil]];
monster.tag = 1;
[_monsters addObject:monster];
}
-(void)gameLogic:(ccTime)dt {
[self addMonster];
}
- (id) init
{
if ((self = [super initWithColor:[LevelManager sharedInstance].curLevel.backgroundColor])) {
CGSize winSize = [CCDirector sharedDirector].winSize;
_player = [CCSprite spriteWithFile:@"player2.png"];
_player.position = ccp(winSize.width/2, 20);
[self addChild:_player];
[self schedule:@selector(gameLogic:) interval:[LevelManager sharedInstance].curLevel.secsPerSpawn];
[self setTouchEnabled:YES];
_monsters = [[NSMutableArray alloc] init];
_projectiles = [[NSMutableArray alloc] init];
[self schedule:@selector(update:)];
[[SimpleAudioEngine sharedEngine] playBackgroundMusic:@"background-music-aac.caf"];
}
return self;
}
- (void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
if (_nextProjectile != nil) return;
// Choose one of the touches to work with
UITouch *touch = [touches anyObject];
CGPoint location = [self convertTouchToNodeSpace:touch];
// Set up initial location of projectile
CGSize winSize = [[CCDirector sharedDirector] winSize];
_nextProjectile = [[CCSprite spriteWithFile:@"projectile2.png"] retain];
_nextProjectile.position = ccp(winSize.width/2, 20);
// Determine offset of location to projectile
CGPoint offset = ccpSub(location, _nextProjectile.position);
// Bail out if you are shooting down or backwards
//if (offset.x <= 0) return;
// Determine where you wish to shoot the projectile to
int realX = winSize.width + (_nextProjectile.contentSize.width/2);
float ratio = (float) offset.y / (float) offset.x;
int realY = (realX * ratio) + _nextProjectile.position.y;
CGPoint realDest = ccp(realX, realY);
// Determine the length of how far you're shooting
int offRealX = realX - _nextProjectile.position.x;
int offRealY = realY - _nextProjectile.position.y;
float length = sqrtf((offRealX*offRealX)+(offRealY*offRealY));
float velocity = 480/1; // 480pixels/1sec
float realMoveDuration = length/velocity;
// Determine angle to face
float angleRadians = atanf((float)offRealY / (float)offRealX);
float angleDegrees = CC_RADIANS_TO_DEGREES(angleRadians);
float cocosAngle = -1 * angleDegrees;
float rotateDegreesPerSecond = 180 / 0.5; // Would take 0.5 seconds to rotate 180 degrees, or half a circle
float degreesDiff = _player.rotation - cocosAngle;
float rotateDuration = fabs(degreesDiff / rotateDegreesPerSecond);
[_player runAction:
[CCSequence actions:
[CCRotateTo actionWithDuration:rotateDuration angle:cocosAngle],
[CCCallBlock actionWithBlock:^{
// OK to add now - rotation is finished!
[self addChild:_nextProjectile];
[_projectiles addObject:_nextProjectile];
// Release
[_nextProjectile release];
_nextProjectile = nil;
}],
nil]];
// Move projectile to actual endpoint
[_nextProjectile runAction:
[CCSequence actions:
[CCMoveTo actionWithDuration:realMoveDuration position:realDest],
[CCCallBlockN actionWithBlock:^(CCNode *node) {
[_projectiles removeObject:node];
[node removeFromParentAndCleanup:YES];
}],
nil]];
_nextProjectile.tag = 2;
[[SimpleAudioEngine sharedEngine] playEffect:@"pew-pew-lei.caf"];
}
- (void)update:(ccTime)dt {
NSMutableArray *projectilesToDelete = [[NSMutableArray alloc] init];
for (CCSprite *projectile in _projectiles) {
BOOL monsterHit = FALSE;
NSMutableArray *monstersToDelete = [[NSMutableArray alloc] init];
for (Monster *monster in _monsters) {
if (CGRectIntersectsRect(projectile.boundingBox, monster.boundingBox)) {
monsterHit = TRUE;
monster.hp --;
if (monster.hp <= 0) {
[monstersToDelete addObject:monster];
}
break;
}
}
for (CCSprite *monster in monstersToDelete) {
[_monsters removeObject:monster];
[self removeChild:monster cleanup:YES];
_monstersDestroyed++;
if (_monstersDestroyed > 30) {
CCScene *gameOverScene = [GameOverLayer sceneWithWon:YES];
[[CCDirector sharedDirector] replaceScene:gameOverScene];
}
}
if (monsterHit) {
[projectilesToDelete addObject:projectile];
[[SimpleAudioEngine sharedEngine] playEffect:@"explosion.caf"];
}
[monstersToDelete release];
}
for (CCSprite *projectile in projectilesToDelete) {
[_projectiles removeObject:projectile];
[self removeChild:projectile cleanup:YES];
}
[projectilesToDelete release];
}
// on "dealloc" you need to release all your retained objects
- (void) dealloc
{
[_monsters release];
_monsters = nil;
[_projectiles release];
_projectiles = nil;
[super dealloc];
}
@end