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+====== Dynamic Textures ======
+Sparrow lets you create custom textures directly at run-time. However, we didn’t reinvent the wheel for that feature --- credit goes to the iPhone SDK, which already contains a powerful API called "Core Graphics".
+You access the drawing API with a special init-method of SPTexture, which takes a "block"-parameter you can fill with your drawing code. If you haven't heard of blocks before, that's because they are a relatively new feature on iOS. They are, however, very simple to use. Just think of a block as a function you can define inline --- ActionScript developers are using them all the time.
+Here's a sample of how to create a custom texture with Core Graphics in Sparrow:
+<code objc>
+SPTexture *customTexture = [[SPTexture alloc] initWithWidth:200 height:100
+    draw:^(CGContextRef context)
+    {
+        // draw a string
+        CGContextSetGrayFillColor(context, 1.0f, 1.0f);
+        NSString *string = @"Hello Core Graphics";
+        [string drawAtPoint:CGPointMake(20.0f, 20.0f)
+                 withFont:[UIFont fontWithName:@"Arial" size:25]];
+    }];
+</code>
+The thing starting with the caret (^) is the block. Place your drawing code in the block and it will appear on your texture later.
+If you haven’t worked with Core Graphics before, there are numerous resources on the web that describe how to use them. [[http://maniacdev.com/2009/09/6-resources-for-learning-core-graphics/|Here]] is a good starting point to find out more about them.
+-----
+//Next section: [[Compiled Sprites]]//

manual_v1/dynamic_textures.txt · Last modified: 2013/03/05 10:19 by 127.0.0.1

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