Articles tagged "CoreGraphics"
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The purpose of this post is so that I will have a link to give people when they ask: how do I write an iOS application that pulls data from an RSS feed, displays it pretty and can put things on a map. I'll show you all of that and more as I rewrite my oldest iOS application from scratch: FuelView.
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QuartzGL was introduced as an official feature in Mac OS X 10.5 Leopard (although it was a developer-only feature in Mac OS X 10.4 as Quartz 2D Extreme). However, it is off by default and is largely ignored by most developers. In this post, I look at how to enable QuartzGL, the performance impact it has on different kinds of drawing and whether you should use it in your Mac programs.
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ZoomingViewControlleris a class you can attach to any existing view that will let you zoom the view to fullscreen with a single tap, rotate the view while in fullscreen by rotating the device and tap to return to the original inline state. -
In this post, I look at 5 different ways that you can draw a very simple shape: a square with a triangular hole cut out of the center. In a drawing environment like CoreGraphics which offers double buffering, winding count path filling, even-odd path filling and clipping regions, there's no single answer. An iPhone sample project is provided containing the code but all drawing functions are identical on the Mac.
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Alpha masks are a powerful way to create graphical effects in your program. In this post, I'll show you how to create an alpha mask from a text string and use that mask to create text-based effects with an image. I'll also show you how to do this on the iPhone and the Mac, so you can see the differences between these platforms in this area.
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The "Text" (SMS) application on the iPhone uses a custom, semi-transparent view to show its "Sending..." message over the keyboard. I'll show you a simple class that can display semi-transparent loading messages and how you can display messages over the keyboard.
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This post presents a function &mdash DrawGlossGradient(CGContextRef context, NSColor *color, NSRect inRect) &mdash that will draw a "gloss" gradient in a single statement. All colors in the gradient are calculated from the single color parameter.
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This is a small application which shows the basic CoreGraphics line drawing primitives. Includes mouse editable control points to manipulate the primitives graphically.