大佬教程收集整理的这篇文章主要介绍了iOS使用加速度计在圆圈内移动对象，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration { //NSLog(@"x : %g",acceleration.X); //NSLog(@"y : %g",acceleration.y); //NSLog(@"z : %g",acceleration.z); delta.x = acceleration.x * 10; delta.y = acceleration.y * 10; joypadCap.center = CGPointMake(joypadCap.center.x + delta.x,joypadCap.center.y - delta.y); distance = sqrtf(((joypadCap.center.x - 160) * (joypadCap.center.x - 160)) + ((joypadCap.center.y -206) * (joypadCap.center.y - 206))); //NSLog(@"Distance : %f",distancE); touchAngle = atan2(joypadCap.center.y,joypadCap.center.X); NSLog(@"Angle : %f",touchAnglE); if (distance > 50) { joypadCap.center = CGPointMake(160 - cosf(touchAnglE) * 50,206 - sinf(touchAnglE) * 50); }
我在github上设置了一个示例项目here,但这是最重要的部分：
float distance = sqrtf(((point.x - halfOfWidth) * (point.x - halfOfWidth)) +
((point.y - halfOfWidth) * (point.y - halfOfWidth)));
if (distance > maxDistancE)
{
// Convert point from screen coordinate system to cartesian coordinate system,// with (0,0) located in the centre of the view
CGPoint poinTinCartesianCoordSystem = [self convertScreenPointToCartesianCoordSystem:point
inFrame:self.view.frame];
// Calculate angle of point in radians from centre of the view
CGFloat angle = atan2(poinTinCartesianCoordSystem.y,poinTinCartesianCoordSystem.X);
// Get new point on the edge of the circle
point = CGPointMake(cos(anglE) * maxDistance,sinf(anglE) * maxDistancE);
// Convert BACk to screen coordinate system
point = [self convertCartesianPointToScreenCoordSystem:point inFrame:self.view.frame];
}
和：
- (CGPoint)convertScreenPointToCartesianCoordSystem:(CGPoint)point inFrame:(CGRect)frame { float x = point.x - (frame.size.width / 2.0f); float y = (point.y - (frame.size.height / 2.0f)) * -1.0f; return CGPointMake(x,y); } - (CGPoint)convertCartesianPointToScreenCoordSystem:(CGPoint)point inFrame:(CGRect)frame { float x = point.x + (frame.size.width / 2.0f); float y = (point.y * -1.0f) + (frame.size.height / 2.0f); return CGPointMake(x,y); }
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