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Now at this point in the chapter, don t become concerned if some of this GDI+ logic looks a bit foreign. However, notice that you are obtaining a Graphics object from a *.jpg file loaded from the local application directory (via the static Graphics.FromImage() method). Because you have explicitly created this Graphics object, best practice states that you should Dispose() of the object when you have finished making use of it, to free up the internal resources for use by other parts of the system. However, notice that you did not explicitly call Dispose() on the Graphics object you obtained from the incoming PaintEventArgs. This is due to the fact that you did not directly create the object and cannot ensure other parts of the program are making use of it. Clearly, it would be a problem if you released a Graphics object used elsewhere! On a related note, recall from our examination of the .NET garbage collector in 5 that if you do forget to call Dispose() on a method implementing IDisposable, the internal resources will eventually be freed when the object is garbage-collected at a later time. In this light, the manual disposal of the imgGraphics object is not technically necessary. Although explicitly disposing of GDI+ objects you directly created is smart programming, in order to keep the code examples in this chapter crisp, I will not manually dispose of each GDI+ type.

Our next task is to examine the underlying coordinate system GDI+ defines three distinct coordinate systems, which are used by the runtime to determine the location and size of the content to be rendered First we have what are known as world coordinates World coordinates represent an abstraction of the size of a given GDI+ type, irrespective of the unit of measurement For example, if you draw a rectangle using the dimensions (0, 0, 100, 100), you have specified a rectangle 100!100 things in size As you may guess, the default thing is a pixel; however, it can be configured to be another unit of measure (inch, centimeter, etc) Next, we have page coordinates Page coordinates represent an offset applied to the original world coordinates This is helpful in that you are not the one in charge of manually applying offsets in your code (should you need them).

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Figure 14-16. Looking good in Firefox! Now it s time to fire up IE 6 and find out how much work is ahead of us.

Any string (must be unique in the .rels file) The type of the relationship The folder and file that contain the target of the relationship (this is also a part)

For example, if you have a Form that needs to maintain a 100!100 pixel border, you can specify a (100*100) page coordinate to allow all rending to begin at point (100*100) In your code base, however, you are able to specify simple world coordinates (thereby avoiding the need to manually calculate the offset) Finally, we have device coordinates Device coordinates represent the result of applying page coordinates to the original world coordinates This coordinate system is used to determine exactly where the GDI+ type will be rendered When you are programming with GDI+, you will typically think in terms of world coordinates, which are the baseline used to determine the size and location of a GDI+ type To render in world coordinates requires no special coding actions simply pass in the dimensions for the current rendering operation: void MainForm_Paint(object sender, PaintEventArgs e) { // Render a rectangle in world coordinates.

Graphics g = eGraphics; gDrawRectangle(PensBlack, 10, 10, 100, 100); } Under the hood, your world coordinates are automatically mapped in terms of page coordinates, which are then mapped into device coordinates In many cases, you will never directly make use of page or device coordinates unless you wish to apply some sort of graphical transformation Given that the previous code did not specify any transformational logic, the world, page, and device coordinates are identical If you do wish to apply various transformations before rendering your GDI+ logic, you will make use of various members of the Graphics type (such as the TranslateTransform() method) to.

Interfaces can also be used as method return values. For example, you could write a method that takes any System.Object, checks for IPointy compatibility, and returns a reference to the extracted interface: // This method tests for IPointy-compatibility and, // if able, returns an interface reference. static IPointy ExtractPointyness(object o) { if (o is IPointy) return (IPointy)o; else return null; } We could interact with this method as follows: static void Main(string[] args) { // Attempt to get IPointy from Car object. Car myCar = new Car(); IPointy itfPt = ExtractPointyness(myCar); if(itfPt != null) Console.WriteLine("Object has {0} points.", itfPt.Points); else Console.WriteLine("This object does not implement IPointy"); }

Truth be told, it could be worse, but we still have some problems to solve after our first test in IE (Figure 14-17): The left margin is too wide on our second column (probably IE s doubled float-margin bug at work). The three-pixel jog bug is at work in our third column (due to either the .float-wrapper or the floated .first-col). Our navbar is nowhere near the header (smells like a problem with absolute positioning).

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