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# Blit the 'carry' image to the background and reset it if self.carry_image: x, y = self.location w, h = self.carry_image.get_size() surface.blit(self.carry_image, (x-w, y-h/2)) self.carry_image = None def render(self, surface): # Call the render function of the base class GameEntity.render(self, surface) # Extra code to render the 'carry' image if self.carry_image: x, y = self.location w, h = self.carry_image.get_size() surface.blit(self.carry_image, (x-w, y-h/2)) The constructor for our Ant class (__init__) first calls the constructor for the base class with the line GameEntity.__init__(self, world, "ant", image). We have to call it this way because if we were to call self.__init__ Python would call the constructor in Ant and end up in an infinite loop! The remaining code in the ant s constructor creates the state machine (covered in the next section) and also sets a member variable called carry_image to None. This variable is set by the carry function and is used to store the image of an object that the ant is carrying; it could be a leaf or a dead spider. If the drop function is called, it will set carry_image back to None, and it will no longer be drawn. Because of the ability to carry other images, ants have an extra requirement when it comes to rendering the sprite. We want to draw the image the ant is carrying in addition to its own image, so ants have a specialized version of render, which calls the render function in the base class and then renders carry_image, if it is not set to None.

Inline IL allows you to define your function s body directly in intermediate language (IL), the language into which F# is compiled This was mainly added to the language to implement certain low operators and functions such as addition and box and not It is rare that you will need to use this feature because the F# library FSharpCoredll already expose all of the functionality built into IL that you are likely to need However, for those rare occasions where you need to do something that you can t do in F# but you can in IL, it s nice to know you have the option of inline IL Using inline IL is simple You just place the IL instructions you would like between parentheses with pound signs, as in (# #).

public static int InsertLineItem(int orderID, LineItem lineItem) { int rows = -1; try { Product product = lineItem.Item; OdbcConnection dataConnection = new OdbcConnection(); dataConnection.ConnectionString = DataUtilities.ConnectionString; dataConnection.Open(); OdbcCommand dataCommand = new OdbcCommand(); dataCommand.Connection = dataConnection; // Build command string StringBuilder commandText = new StringBuilder("INSERT INTO [Orders Details] ("); commandText.Append("OrdersID, "); commandText.Append("ProductID, "); commandText.Append("UnitPrice, "); commandText.Append("Quantity, "); commandText.Append("Discount) VALUES ("); commandText.Append(orderID); commandText.Append(", "); commandText.Append(product.ProductID); commandText.Append(", "); commandText.Append(product.Price); commandText.Append(", "); commandText.Append(lineItem.Quantity); commandText.Append(", "); commandText.Append(0); commandText.Append(")"); dataCommand.CommandText = commandText.ToString(); rows = dataCommand.ExecuteNonQuery(); dataConnection.Close(); } catch(Exception e) { Console.WriteLine(e.Message); }

The IL instructions are placed inside a string and use the standard notation that can be compiled with ilasmexe This must be a correctly formed IL, or you will get a compiler error You can then pass parameters to your IL instruction They are pushed onto the IL evaluation stack You must also use the standard colon notation to tell the compiler what the return type will be This is placed inside the parentheses You will also need to be explicit about the types of the parameters since the compiler has no way of inferring their types You ll now look at an example of using inline IL Imagine for whatever reason that you do not want to use the add and subtract operators defined in the F# base library fslibdll, because you may want to replace them with your own functions.

Each ant is going to have four states in its state machine, which should be enough to simulate ant-like behavior. The first step in defining the state machine is to work out what each state should do, which are the actions for the state (see Table 7-1). Table 7-1. Actions for the Ant States

return rows } } }

You define two functions, add and sub, whose bodies are defined using IL: // declare add function let add (x:int) (y:int) // declare sub function let sub (x:int) (y:int) // test these functions let x = add 1 1 let y = sub 4 2 // print the results printfn "x: %i y: %i" x y The results of this example, when compiled and executed, are as follows: x: 2 y: 2 The programmer should be careful when using this technique because it is trivial to write a program that does not make any sense, and the compiler is unable to warn you about this Consider the following program where you revise your previous example to replace the "add" instruction with a "ret" instruction, which means return a value and makes no sense in this context.

Walk toward a random point in the world. Head toward a leaf. Deliver something to the nest. Chase a spider.

This example will compile without error or warning; on execution, you will get an error using the IL = (# "add" x using the IL = (# "sub" x add y : sub y : instruction int #) instruction int #).