By Vandad Nahavandipoor
Jazz up your iPhone and iPad apps with a few slick photos and animation—and hold clients from having a look in different places. This brief and concise publication indicates builders with even little Cocoa programming event the way to create notable pix and animation results with fairly effortless coding. the right way to include gentle animations and draw photos on your apps to accomplish the stylish glance you want.
The recipes during this booklet contain step by step directions and straightforward code ideas for you to positioned to paintings correct away.
- Learn uncomplicated strategies for adapting to diverse display sizes
- Construct, set, and use colors
- Draw textual content, photos, strains, and rectangles
- Add shadows to shapes
- Create and draw gradients
- Learn easy methods to animate and scale, rotate, or flow views
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Additional resources for Graphics and Animation on iOS: A Beginner's Guide to Core Graphics and Core Animation
CGContextAddPath procedure Adds a given path (specified by a path handle) to a graphics context, ready for drawing. CGContextDrawPath procedure Draws a given path on the graphics context. CGPathRelease procedure Releases the memory allocated for a path handle. CGPathAddRect procedure Adds a rectangle to a path. The rectangle’s boundaries are specified by a CGRect structure. There are three important drawing methods that you can ask the CGContextDrawPath procedure to perform: kCGPathStroke Draws a line (stroke) to mark the boundary or edge of the path, using the currently selected stroke color.
Again, don’t worry if this is too difficult to grasp. I will give you many examples to help you fully understand the concept. Number of locations This specifies how many colors and locations we want. Let’s have a look at an example. Suppose we want to draw the same gradient we saw in Figure 26? Here’s how: 1. Pick the start and end points of the gradient—the axis along which it will shift. In this case, I’ve chosen to move from left to right. Think of this as changing color as you move along a hypothetical horizontal line.
This is the default join type. kCGLineJoinBevel Joins will be squared off on the corner. kCGLineJoinRound As the name implies, this makes round joins. Let’s have a look at an example. Let’s say we want to write a program that can draw “rooftops” on a graphics context (three of them, one for each join type), and also draws text below each rooftop describing the type of join it is using. Something similar to Figure 18 will be the result. Figure 18. info To accomplish this, I’ve written a method named drawRooftopAtTopPointof:text ToDisplay:lineJoin:, which takes three parameters: 1.