October 2012
Intermediate to advanced
116 pages
2h 44m
English
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Chapter 6. Drawing Heat Maps
One of the more obvious missing features of the Map Kit framework is the ability to render heat maps on top of map views. However, while you’ve only met polygon overlays so far (see Chapter 3), it is also possible to use the overlay images on top of maps. You can use that to draw heat maps on top of your maps that will be fixed in the map view and move around as the user scrolls the map back and forth.
Note
The demonstration application we’re going to build in this chapter
makes heavy use of heat map code written by George Polak at Skyhook
Wireless. Thanks to him and the all the team at Skyhook Wireless, both for
the code and assistance. The SHGeoUtils class is copyright Skyhook Wireless
and used with permission; it is distributed under an MIT license.
Building an Earthquake Map
You’re going to build a demonstration application with a heat map from data representing the Richter scale magnitude of a recent earthquake in New England.
Open Xcode and choose Create a new Xcode project in the startup
window. Choose the Single View Application template from the iOS section
of the New Project popup window. When prompted, name your new project
HeatMap. In the Company Identifier
box, enter the root part of your Bundle Identifier (see the iOS
Provisioning Portal) used in your Provisioning Profile; for me, this is
uk.co.babilim. You should leave the Class Prefix box blank. Ensure that the Device Family is set to iPhone, the checkbox for ARC is ticked, and the boxes for ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.