ios - Cocos2d 纵向模式下的偏移问题

Question

我在 Ray Wenderlich 关于 Cocos 2d 中旋转炮塔的教程的基础上工作(参见此处:http://www.raywenderlich.com/25791/rotating-turrets-how-to-make-a-simple-iphone-game-with-cocos2d-2-x-part-2)。我需要我的游戏处于纵向模式，这样我才能正确获得炮塔的位置:

炮塔设法向右射击，但没有向左射击。这是我的代码:

- (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(160, 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;

感谢您的帮助!

Answer 1

你正在检查 x 轴而不是 Y

// Bail out if you are shooting down or backwards
if (offset.x <= 0) return

;