By Erica Sadun
Apple lavished iOS with a wealthy and evolving library of resolution-independent second drawing utilities. Its APIs comprise strong positive factors resembling transparency, path-based drawing, anti-aliasing, and extra. Harness those low-level, light-weight drawing workouts on your apps to construct photographs, to create PDFs, to demonstrate perspectives, and to print. during this advisor, Erica Sadun, bestselling writer of The center iOS 6 Developer's Cookbook and The complex iOS 6 Developer's Cookbook, is helping readers discover iOS drawing via an abundance of examples along lots of motives and assistance. This brief paintings offers the fundamental how-to builders have to start.
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Extra info for iOS Drawing: Practical UIKit Solutions
Specify whether you want to convert a point into another coordinate system (toView:) or from another coordinate system (fromView:), as was done in this example. The views involved must live within the same UIWindow, or the math will not make sense. The views do not have to have any particular relationship, however. They can be siblings, parent/child, ancestor/child, or whatever. The methods return a point with respect to the origin you specify. Conversion math applies to rectangles as well as points.
Next, adjust the placement for each letter based on the percentage consumed by each iteration. Use this percentage to calculate a rotation angle for laying down the letter. Finish by drawing the letter just as you did in Listing 1-12. What you end up with is a layout that respects the width of each letter, moving forward proportionately according to the letter’s natural size. width / 2, -r); // Draw the letter [letter drawAtPoint:CGPointMake(0, 0) withFont:font]; // Reset the context back to the way it was CGContextRestoreGState(context); } Figure 1-15 This version uses better spacing, based on the width of each letter.
When you change the context stack, you choose which canvas to draw to. The state stack is specific to each context. ” Both approaches use stacks, but they affect different parts of the graphics system. Each graphics state remembers any changes made to it. For example, if you push a new state onto the stack and adjust the default line width to 10, that context state persists until it’s popped off the stack. After that, the default line width returns to whatever value it was before that state was created.