I'm using the accelerometer to move an object on my screen.
It's only working when the iphone is flat.
If I use the iPhone in another position, the object is not moving like I want
(the Y axis is not well managed).
So, I've to calibrate the position of the accelerometer, I guess.
But I've no idea how to do this.
Please help me.
Thanks in advance.
Regards,
ALpesH
hi hope all is well.
A simple google search came up with this beautiful post.
It is exactly what you wanted. A tutorial on Accelerometer Calibration & Optimizations.
This tutorial assumes you know the basics of the accelerometer. If not there are plenty of tutorials on google that will help get you accustomed to the accelerometer basics.
This tutorial will focus on 3 things:
Calibrating the accelerometer so the user can play your game from any
position.
Changing the "sensitivity" of your object's movement.
Adding the option to "invert" the controls.
First off, why bother adding these features? Simple. Launch your accelerometer based game and try the following tests:
Play sitting up in perfect position.
List item
Play it slouched over.
Play it lying down on your side.
Play it lying on your back with the device parallel to the floor and
the screen facing you.
Obtained from this website:
http://www.iphonedevsdk.com/forum/iphone-sdk-tutorials/39833-tutorial-accelerometer-calibration-optimizations.html
Let me know if this helps if it does choose this as the answer.
Other than that if you need any more help let me know
Ive implemented this tutorial code in my own app and i am not playing a simple ping pong game upside down and also playing it on the side whilst lying on the bed. :D
Pk
Related
I'm looking to write an app that lets users draw a game, something like tic-tac-toe, for example. One user would begin by drawing the grid, and then each player could literally draw their own O or X. It would be a multiplayer game where each user has his/her own device.
I'm not sure what would be the best way to share this data from device to device. I've only been able to think of 2 options:
Should I attempt to upload a screenshot to the server after each player makes a move?
Should I upload the exact points where the user is drawing and then redraw these points on the other user's screen?
Any other suggestions, or maybe a point in the right direction? I'm fairly new to all of this so please don't be too harsh ;)
starting out on a multiplayer game (even if it is a straightforward one) is ambitious :) if you don't mind restricting yourself to iOS5 and above, then i would check out the new turn based multiplayer game functionality. there's a good tutorial here:
http://www.raywenderlich.com/5480/beginning-turn-based-gaming-with-ios-5-part-1
I have image named "platform.png" that represents one brick for platform of a IPhone game. I have a cartoon character that will jump on this platform.
A series of platform.png will form one complete platform. These series will be generated by swiping finger across Iphone screen. When character will jump on this platform it should go down like elastic and bounce back up. Can anyone tell me how to do this ?
Thanks in advance.
What yo want is Collision Detection. I don't think using Cocos2d will be a great idea to use in this case because you want to show elastic and bounce effects which should seem real. For this, what I suggest, is using Box2d which clearly help in showing the effects in a natural way. Here Collision Detection can be handled in a separate class known as ContactListener. You can study Box2d and ContactListener here. In ContactListener you can generate these effects and this class is very easy to handle. Two or three months back I used the same to create my game Pogo Jump and believe me I was very easy to work on Box2d.
Good luck..!!
heye ,
you have two options for this , either use box-2d/chipmunk or dont.
If you have prior experience with Physics then i would say box-2d/chipmunk would look more realistic.
I'm wanting to figure out if a user is not moving at all, walking, or running using the iPhone. I'm not trying to implement a pedometer. I just want to know around about if someone is moving briskly, slowly, or not at all. I don't need mph or anything like that.
I think the accelerometer may be able to do this for me, but I was wondering if someone knows of any tutorials or example code that might be able to point me in the right direction?
Thanks to all that reply
The accelerometer won't do you any good here - it will only capture changes in velocity.
Just track the current location periodically and calculate the speed.
There are no hard thresholds for walking vs. running motion, so you will have to experiment a bit. The AccelerometerGraph sample code should get you started on how to get and interpret accelerometer data.
The Accelerometer is good, but if the user has an iPhone 4 or iPad 2 you should use the gyroscope.
CMMotionManager and Event Handeling Guide - Motion Events
Apple Documentation is the best example you can get!
People have a different bounce in their step between walking and running which can be measured with the accelerometer, but this differs between individuals (what shoes they are wearing, what surface they are upon, what part of the body is attached to the iPhone etc.), and this motion can probably be imitated by shaking the iPhone just right while standing still.
Experiment by recording the two types of acceleration profiles, and then use some sort of pattern matching to pick the most likely profile candidate from the current recorded acceleration data.
I am hoping to build an application similar to those egg shaking applications, to better understand how to detect motion on the iphone. I've been looking at accelerometer methods and motion and motion methods, but can't seem to get working what I want to do.
The specifics of my need are as follows: I want to be able to play one sound when user shakes the phone away from them, and play another sound when they shake back towards them. The motion from the user would be very similar to an egg shaker, with two different sounds able to be played depending on whether they moved the device towards or away from their chest. It would also be good to measure the intensity with which they moved away or towards.
Any ideas?
I've searched apple's sample code for a similar application, but there doesnt seem to be one.
Look at this game which is open source and makes great use of the accelerometer. It's a good one to be able to tell which direction you are going, but I haven't messed around much with intensity. I'm sure it's easy enough once you get into the details.
http://github.com/haqu/tweejump
I'm creating an iPhone application.
My application needs to detect the movements of the accelerometer and report the case of movement by the user.
In practice I have to constantly check that the coordinates received from accelerometer are equal to the coordinates saved in my movement.
My problem is that its implementation is not simple because I know there are many factors that create difficulties.
Someone knows a tutorial or guide to propose.
I also welcome suggestions ...
Thank you very much
You can use this paper as a starting point.
It shows detection of a user walking, running, walking up or down stairs or standing still. Even though it's based on Android the principle will be the same.