我正在使用cocos2d开发iPhone游戏。我试图在竖屏模式下使用加速计来移动精灵进行左右移动。但是,由于我使用的代码默认情况下会向右移动,除非手机倾斜45度角,也就是说返回值都是正数(表示应该向右移动),直到将其向左或向右倾斜45度角。中心位置返回大约600,然后随着手机向左或向右倾斜而减少,直到达到45度角(此时返回0并开始变负)。以下是我正在使用的代码。任何帮助都将不胜感激。
- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {
#define kFilteringFactor 0.75
static UIAccelerationValue rollingX = 0, rollingY = 0, rollingZ = 0;
rollingX = (acceleration.x * kFilteringFactor) +
(rollingX * (1.0 - kFilteringFactor));
rollingY = (acceleration.y * kFilteringFactor) +
(rollingY * (1.0 - kFilteringFactor));
rollingZ = (acceleration.z * kFilteringFactor) +
(rollingZ * (1.0 - kFilteringFactor));
float accelX = rollingX;
float accelY = rollingY;
float accelZ = rollingZ;
CGSize winSize = [CCDirector sharedDirector].winSize;
#define kRestAccelX 0.6
#define kShipMaxPointsPerSec (winSize.height*0.5)
#define kMaxDiffX 0.2
float accelDiffX = kRestAccelX - ABS(accelX);
float accelFractionX = accelDiffX / kMaxDiffX;
float pointsPerSecX = kShipMaxPointsPerSec * accelFractionX;
_shipPointsPerSecX = pointsPerSecX;
NSLog(@"_shipPointsPerSecX: %f", _shipPointsPerSecX);
}
- (void)updateShipPos:(ccTime)dt {
CGSize winSize = [CCDirector sharedDirector].winSize;
float maxX = winSize.width - _ship.contentSize.width/2;
float minX = _ship.contentSize.width/2;
float newX = _ship.position.x + (_shipPointsPerSecX * dt);
newX = MIN(MAX(newX, minX), maxX);
_ship.position = ccp(newX, _ship.position.y);
// NSLog(@"newx: %f", newX);
}