how to print barcode in vb.net 2008 Figure 13.1 The iPhone does abstract art. in Objective-C

Creating Denso QR Bar Code in Objective-C Figure 13.1 The iPhone does abstract art.

Figure 13.1 The iPhone does abstract art.
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The Quartz context
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paths. You see lines connecting one circle to the next, as if the pencil never comes off the page, a topic we ll talk about more in the next section. Leaving aside those specifics for a moment, this shows one of the two ways you can use all the Quartz functions described in this chapter: by painting a UIView. And remember that a UIView can be almost any UIKit object, due to inheritance. Drawing to a UIView allows for on-screen picture creation, but you can also draw pictures without displaying them immediately. That s done with a bitmap.
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13.2.2 Drawing to a bitmap
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The main reason to create a bitmap rather than draw directly to a view is to use your graphic several times in your program perhaps all at the same time. For example, Apple offers a sample program that draws the periodic table by creating a standard bitmap that s used for all the elements and then repeating it. You might similarly create billiard balls using bitmaps if you were programming a billiards game. In chapter 10, you could have used Quartz to create the dots that you used in the gravity and altitude programs as bitmaps, so that you didn t have to separately create them outside the program. The process of creating a bitmap and turning it into a UIImage is relatively simple. You create a graphical context, draw in that context, save the context to an image, and close the context. The following code shows how to create a red dot image like the one you used in earlier programs:
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- (void)viewDidLoad { [super viewDidLoad]; UIGraphicsBeginImageContext(CGSizeMake(20,20)); CGContextRef ctx = UIGraphicsGetCurrentContext(); CGContextBeginPath(ctx); CGContextAddArc(ctx,10,10,10,0,2*M_PI,1); CGContextSetRGBFillColor(ctx, 1, 0, 0, 1); CGContextFillPath(ctx); UIImage *redBall = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); UIImageView *redBallView = [[UIImageView alloc] initWithImage:redBall]; redBallView.center = CGPointMake(160,330); [self.view addSubview:redBallView]; }
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Again, this example is simple. You could do this work anywhere you wanted, but we ve elected to use the viewDidLoad setup method. To start the process, you create an image context, which is to say a bitmap, and you immediately retrieve that context s variable for use. Following that, you do whatever drawing work you want. When you ve finished, you turn the bitmap into a UIImage and close out your context. You can then manipulate the image as you see fit; here it s turned into a UIImageView. You now know two ways to use contexts in the Quartz environment. With that in hand, you re ready to dive straight into what Quartz can do, starting with paths, which are the foundation of most Quartz work.
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Graphics: Quartz, Core Animation, and OpenGL
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13.3 Drawing paths
The path is what Quartz draws. If you ve worked with Canvas, this will look familiar, because both libraries use the same drawing paradigm. A path is a set of lines, arcs, and curves that are all placed continuously within a graphical context. You only paint a path when it s complete, at which point you can choose to either fill it or stroke it. Many of the functions required to define and draw paths are listed in table 13.2.
Table 13.2 A variety of simple drawing functions that allow for vector-based graphics Function CGContextBeginPath CGContextAddArc Arguments context context, x, y, radius, startangle, endangle, clockwise Summary Creates a new path. Creates an arc, with the angles defined in radians. A line is drawn to the start point if there are previous entries in the path and from the end point if there are additional entries. The more complex functions CGContextAddArcToPoint, CGContextAddCurveToPoint, and CGContextAddQuadCurveToPoint allow for the creation of tangential arcs, Bezier curves, and quadratic Bezier curves. Creates an ellipse that fits inside the rectangle. Creates a line from the current point to the designated end point. The more complex CGContextAddLines function allows the addition of an array of lines. Creates a rectangle. The more complex CGContextAddRects function adds a series of rectangles. Moves to the point without drawing.
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