To unravel this I've spent a bit too much time digging through the Apple docs. There are three ways of obtaining magnetometer data 1/ Core Motion framework CMMotionManagers's CMMagnetometer class 2/ Core Motion framework CMDeviceMotion CMCalibratedMagneticField property 3 / Core Location framework CLLocationManager's CLHeading 1/ supplies 'raw' data from the magnetometer. 2/ and 3/ return 'derived
The content provider/ resolver APIs provide a complicated, but robust way of transferring data between processes using a URI and the openInputStream() and openOutputStream() methods. Custom content providers have the ability to override the openFile() method with custom code to effectively resolve a URI into a Stream; however, the method signature of openFile() has a ParcelFileDescriptor return ty
Very "simple" problem: given two CLLocationCoordinate2Ds, how can I get the bearing (as radians) from the first to the second? I've done a lot of research and studying on this, both the general problem and Objective-C/Cocoa Touch/iOS specifically. Here's my implementation: - (float) getHeadingForDirectionFromCoordinate:(CLLocationCoordinate2D)fromLoc toCoordinate:(CLLocationCoordinate2D)toLoc { fl
Normally, you'd use something like: glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glEnable(GL_BLEND); glEnable(GL_LINE_SMOOTH); glLineWidth(2.0f); glVertexPointer(2, GL_FLOAT, 0, points); glEnableClientState(GL_VERTEX_ARRAY); glDrawArrays(GL_LINE_STRIP, 0, num_points); glDisableClientState(GL_VERTEX_ARRAY); It looks good in the iPhone simulator, but on the iPhone the lines get extremely thin
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