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Example 1
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Example 2
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FIGURE 18.1 fewer points.
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The program fragment on the right generates
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GOING FURTHER
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18.3.2 SCORING WITH THE BATTERY If you recall from Chap. 13, RobotBASIC has a simulated battery. The robot has the ability to determine the amount of charge left on the battery and to recharge the battery. If the battery option is enabled by issuing an rIgnoreCharge false statement the robot will cease to operate if the battery becomes depleted. This provides another method for scoring contests. The winner could be the robot that accomplishes the most of whatever the robot is supposed to achieve before the battery runs out. Just like in car racing you could allow the contestants robots to pull into a pit to recharge their batteries by docking with recharging stations. This would cause the robot to abandon its tasks to seek a station, but that just adds more variety to the contest. Robots that can nd the charging station quicker have an advantage, and ef cient algorithms are rewarded because they allow the robot to work longer before having to charge the battery. 18.3.3 SCORING WITH THE QUALITY OF CODE Another way of judging the entries would be on the programmers coding style and ef ciency. With physical robots, contestants use a variety of microprocessors and programming languages like C, BASIC, assembly, and so on. This makes it hard to have a standard for judging the code since there is no homogeneity between programming languages. In RobotBASIC-based contests all the contestants are using the same programming language. Since the code to achieve the simulations can be made readily available to judges, the style and readability of code can be an element in the scoring standards. This would encourage contestants to code more professionally. This method of comparing entries can be more subjective rather than objective, but with a proper set of standards the subjectivity can be minimized. However, the eld of robotics and programming is as much an art as it is science and, like any art contest, the contestants creativity and style can be a valid subject for judgment.
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18.4 Constructing Contest Environments
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Considerable time, effort, and expense are typically required by the contest organizers to create a challenging and suitable contest environment (mazes for instance). Also the contestants themselves need to construct similar environments in the process of creating and testing their robots. Organizers often have to post a complex description of the environment that will be used in the contest. These speci cations have to be very clear, precise, and understandable. On the day of the contest, if contestants have misinterpreted these speci cations, their robots and/or code may require a considerable amount of modi cation to adapt to the unanticipated environment. RobotBASIC allows many methods for contest organizers to distribute very precise speci cations of their intended contest environment:
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1. Subroutines can be distributed so as to be incorporated into the contestant s code to
create a similar (or exactly the same) environment as the target environment.
CONTESTS WITH ROBOTBASIC
2. The WriteScr command can be used to create a bitmap le of the environment, which
can then be used by a contestant with the command ReadScr to create an environment similar to (or the same as) the intended environment. 3. Files created with the MWrite command can be given to contestants who then use the MRead command to create an array that will be used to recreate (using mPolygon) the contest environment. Contestants write their code to use the distributed les and judges can run these programs using whatever le they desire to test and judge the entries. Using this method, judges may wish to test the entries on various les that simulate environments of varying dif culty or complexity, and thus can judge winners on various levels.
18.5 Summary
In this chapter you have seen that: RobotBASIC contests can be motivational and how they can be used to increase participation in a club or classroom. Contests can be designed to appeal to contestants of various skills and abilities. The types of contests and scoring methods are limited only by the imagination. Contests can emphasize the utility of mathematics and logical thinking. Contest organizers and contestants can save time, effort, and expense when participating in robotic competitions using RobotBASIC.
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