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The trick to solving this problem is to make the motion time-based. We need to know how much time has passed since the previous frame so we can position everything on the screen accordingly. The pygame.time module contains a Clock object that we can use to keep track of time. To create a clock object, call its constructor pygame.time.Clock: clock = pygame.time.Clock() Once you have a clock object, you should call its member function tick once per frame, which returns the time passed since the previous call in milliseconds (there are 1,000 milliseconds in a second): time_passed = clock.tick() The tick function also takes an optional parameter for the maximum frame rate. You may want to set this parameter if the game is running on the desktop so that it doesn t use all the computer s processing power: # Game will run at a maximum 30 frames per second time_passed = clock.tick(30) Milliseconds are often used to time events in games because it can be easier to deal with integer values rather than fractional times, and 1,000 clock ticks per second is generally accurate enough for most game tasks. That said, I often prefer to work in seconds when dealing with things such as speeds, because 250 pixels per second makes more sense to me than .25 pixels per millisecond. Converting from milliseconds to seconds is as simple as dividing by 1,000: time_passed_seconds = time_passed / 1000.0

The biggest drawback of this approach is that the code itself contains debugging statements that should be removed for production builds. There isn t a strip command for removing debugging print statements like there is for removing debugging symbols. For this reason, many QA departments want to retest the code after instrumentation has been removed, because it does require a rebuild of the software. Minor drawbacks include the fact that you may mistakenly write instrumentation code that has a side effect on the program; for example: printf("value of a=%u\n", a++); // changes the value of a!

8. Click the Confirm button to check that the domain name is available to use. If it is not available, you will see the message shown in Figure 11-18. Just choose another one and try again.

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Caution Be sure to divide by a floating-point value of 1000.0. If you don t include the floating point, the

When this is removed from the code, it will probably have an effect on how the program operates because it changes the value of a in the print statement. Most engineers know not to do something like this, but everyone makes mistakes. Instrumentation in C is very simple because of the preprocessor. Consider the small example project that uses a symbol D to enable debugging. When the symbol D is set to 1, extra flags are set to enable debugging. You can use the same mechanism to define a preprocessor symbol that includes code in the C files when the symbol is defined. Defining directives means the symbol is set to some value; any value will suffice. For instance, the make file may look like the following: ifeq ($(D),1) CFLAGS += -g CPPFLAGS +=-DDBG_OUT endif CPPFLAGS aren t additional flags for the C preprocessor C++, even though the CPP in the name may lead you to that conclusion. The source files in the project may contain source code like the following: #ifdef DBG_OUT fprintf(stderr,"a=%u\n", a); #endif This sort of code is peppered through the project, which causes a readability problem if you don t regularly remove the debug output that you know is no longer used. This is a matter of how the company manages the source code: some companies forbid checking in code containing any debugging print code but support the technique as a way for you to debug code on the desktop.

variable to a value (or append data), it s automatically used when appropriate if the standard rule hasn t been overridden. Most makefile authors prefer to use the predefined make rules, so setting this variable and rebuilding results in the right thing happening.

Figure 11-18. The domain name is not available. 9. When you find an available domain name, it will be displayed on the screen. Click Finish. You will see confirmation that the domain name has been set up, as shown in Figure 11-19.

result will be rounded down to the nearest integer!

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