Download Augmented Reality using Appcelerator Titanium Starter by Trevor Ward PDF

By Trevor Ward

Create an open resource Augmented truth Titanium program. construct an efficient show of a number of sights. discover ways to calculate distances among attractions. know the way to successfully and cleanly movement the attractions because the gadget rotates.

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These calculations have again come from the Appcelerator ArTi application. These calculations work nicely and again, I am not a mathematician—trying to explain all the math could result in providing you with misinformation. info Augmented Reality using Appcelerator Titanium Starter POIs To display the Google Places data, or as is normally referred to as POIs, we need to build four views which will sit next to each other in a parent view and contain the POIs for the correct bearing. The buildARDisplay function creates these containers.

We start by activating the Compass and setting its "heading change" event to 1 degree. js module. showCalibration = 1; = false; We have an initial function, retrieveCurrentDirection, which gets the initial compass magnetic heading. Using try-catch enables us to handle errors gracefully. The headingCallback function is fired when the Compass Sensor is updated by 1 degree. launchEvent({ TYPE : 'rotateDisplay' }); } } The gotcha with the compass is on the event listener. If we try to add it when it is already active, it can produce weird results.

LaunchEvent({ TYPE : 'rotateDisplay' }); } } The gotcha with the compass is on the event listener. If we try to add it when it is already active, it can produce weird results. Trying to remove it when it isn't added can crash the application. Also, if we leave it active when the application closes or goes into the background, it uses up the device's resources and re-opening the app can cause it to crash. We can resolve these issues with two other functions—one which adds the event listener and one which removes it.

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