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What laziness will do is make your application faster As an engineer, you may appreciate elegant algorithms and clever code, but to the user, none of that matters Perceived performance is the only kind that matters The saying goes that an ounce of mathematics is worth a pound of engineering I maintain a clever engineer can fake a lot of math A rather primitive method for making fire fakes all the expensive math that goes into a particle engine I can t take credit for inventing the method that honor goes to some anonymous, clever third-grader but I have given it a name: Smoke and Mirrors..

In experimenting with Core Location, we discovered some interesting challenges First, because Core Location s data comes from a system-level process, it sometimes reports old or stale location data This anomaly was particularly frustrating for early Brightkite iPhone application beta testers, as a location across town might show briefly before the application updated to a more accurate value We found that we had to check the time of the Core Location value and establish that it came after the Brightkite iPhone application launched Additionally, on iPhones with built-in GPS modules, the time necessary for Core Location to determine an accurate location fix could be as long as 5-10 seconds This necessitated an engineering decision to leave the GPS radio on for the duration of the Brightkite application launch, therefore ensuring a constant stream of location data and optimum accuracy.

With this setting On, everything that was light on the screen becomes black, and everything that was dark or black becomes white.

The idea behind the Smoke and Mirrors technique is simple. Take a picture of smoke, and animate it in an infinite, treadmill-like loop. For each fire, mask off a nice smoke plume. Put a translucent fire-colored overlay over the bottom, and the smoke animating in the background gives a nice simulation of a particle emitter without any of the math. When I was a kid, we used butcher paper and paper towel tubes. Nowadays, I prefer Photoshop, which I used to create two images: A smoke image that can be tiled (I m no artist, but the Render Clouds filter does a good job) A plume-shaped image that will be used to mask the smoke image into separate fires On the Mac, Core Animation provides a mask property on the CALayer class that makes masking easy, but that property is not available for the iPhone. Alpha masks can still be done using the 2D drawing API, which is referred to as Core Graphics or Quartz 2D. Adding animation is a simple matter of creating an NSTimer instance to call the view s drawRect: method every 1/30 second, assuming you re looking for the standard frame rate of 30 frames per second. When drawRect: is called, a bit of fancy math will convert the time to the smoke s position, which can then be masked and drawn. It looks pretty good in a screenshot, as seen in Figure 7-3. It s about as fast as the screenshot, too. Instead of 30 frames a second, the iPhone barely puts out 2.

Although this approach does affect battery performance, the typical mobile application user jumps in and out of an application rather than leaving it running for a significant period of time Once we were getting fresh, accurate location data, we added a snap feature that unquestionably improved the overall Brightkite experience On the service side, Brightkite not only links geographical coordinates to a specific check-in place but it also recognizes the frequency of visits to that particular location This allows the Brightkite native application to automatically snap to a frequently visited place as the user approaches This place-snapping functionality is one of the most widely touted, user-gratifying features of the native iPhone application This snap feature just wouldn t have been possible in the web application It should be noted that, in iPhone OS 30, a web application can request Core Location data via a JavaScript call.