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Download e-book for iPad: Augmented Reality using Appcelerator Titanium Starter by Trevor Ward

By Trevor Ward

ISBN-10: 1849693900

ISBN-13: 9781849693905

Create an open resource Augmented truth Titanium software. construct a good reveal of a number of sights. learn how to calculate distances among attractions. know the way to successfully and cleanly flow the attractions because the machine rotates.

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Extra resources for Augmented Reality using Appcelerator Titanium Starter

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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.

The gotcha though is that you have to loop through all the POIs view components, calculate the distance based on the new coordinates, and resize the height and width given the new scale, on the original image size. Run this only as a single instance and not when the view movement is occurring. Make sure that you have a flag set to only allow it to be run in this manner. When this is done, consideration also needs to be made for the POIs suddenly being behind the device instead of in front. This means that the process of updating the POIs across views needs to be applied.

This keeps the data on the screen to a minimum. In calculating the position in the view of the POI we divide the screen width by 90, and multiply it by the degree to get its exact position. To make the application do something after the POI view has been created, the addPOIEvent function is called. This function adds an event listener to the image, allowing it to be pressed and display some more data on the screen. It is worth noting that adding event listeners within a for loop is not good practice, which is why it has been separated out into its own function.

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Augmented Reality using Appcelerator Titanium Starter by Trevor Ward


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