A fast, easy to use, free, and community supported 2D game engine
Hello,
I am learning cocos2d for iphone and for android :)
I wanted to get an example of how the accelerometer is used in cocos2d-iphone but there is not a test :(
Is there a reason to avoid having that?
Is it to simple?
If I do something simple, like a ball moving by the accelerometer, does it make sense to do a pull request?
Thanks!
Steve Oldmeadow
Administrator
I know at least the Box2d demo and template use the accelerometer. It probably isn't necessary to have a specific accelerometer test.
hey there,
accessing the accelerometer is part of iOS, not cocos2d, which is probably why there are no tets for it. Here is the function for iphone/ipad. not sure what it would be for android phone, probably similar enough though.
I use the code to dynamically change gravity based on the tilt of the device, but only within a certain range. Should be a pretty good example if you read through it carefully. Hope this helps :)
- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {
// Portrait values
if (currentLevel >= 1 && currentLevel <= 10) {
if (acceleration.x <= 0.4 && acceleration.x >= -0.4)
{
float temp1 = acceleration.x * 30;
float tempy = -fabsf(acceleration.y * 30) + fabsf(acceleration.z * 30);
if (tempy > 30)
{
tempy = 30;
}
float temp2 = -1 * sqrtf(30*30 - temp1 * temp1);
b2Vec2 gravity(temp1, temp2);
_world->SetGravity(gravity);
} else if (acceleration.x > 0.4) {
b2Vec2 gravity(0.4 * 30, -28.0);
_world->SetGravity(gravity);
} else if (acceleration.x < -0.4) {
b2Vec2 gravity(-0.4 * 30, -28.0);
_world->SetGravity(gravity);
}
} else if (currentLevel >= 11 && currentLevel <= 20) {
if (acceleration.x <= 0.4 && acceleration.x >= -0.4)
{
float temp1 = acceleration.x * 20;
float tempy = -fabsf(acceleration.y * 20) + fabsf(acceleration.z * 20);
if (tempy > 20)
{
tempy = 20;
}
float temp2 = -1 * sqrtf(20*20 - temp1 * temp1);
b2Vec2 gravity(temp1, temp2);
_world->SetGravity(gravity);
} else if (acceleration.x > 0.4) {
b2Vec2 gravity(0.4 * 20, -18.7);
_world->SetGravity(gravity);
} else if (acceleration.x < -0.4) {
b2Vec2 gravity(-0.4 * 20, -18.7);
_world->SetGravity(gravity);
}
}
}for more information I'd rad apple documentation, or actually, probably android documentation on it since it will be for that.
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