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rLocate X,Y,Heading,Size,Color
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X and Y are required parameters that de ne the position on the screen to place the robot. Both X and Y have to be whole numbers and must be within the limits of the screen (800 600 pixels). If you try to place the robot off the screen it will be placed at the limit of the screen. Heading is optional and if it is not speci ed, 0 will be the default. Heading speci es the direction the robot will be facing (0 to 359 ) 0 is north, 90 is east, 180 is south and 270 is west. Intermediate headings like northwest would be 315 , and so on. If you need to specify the next parameter Size you must also specify the Heading. Size is optional and if it is not speci ed 20 pixels will be the default. You can specify a maximum of 50 pixels and a minimum of 5 pixels. If you try to specify a number for Size outside these limits the closest limit will be assumed. You must specify Heading and Size if you want to specify the next parameter Color.
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rLocate 300,300,45,40,Red End
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FIGURE 2.5 Program to initialize the robot.
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FIGURE 2.6 Locating the robot. (Note: The screen has been rescaled to t here.)
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Color is also optional and if it is not de ned the color blue will be the default. You can specify any of the colors listed in Sec. B.7.6. When you specify a color consider the oor color the robot is being drawn over. If you specify the same color as the oor color RobotBASIC will select the next color up to avoid making the robot invisible. Let us write a program to place the robot on the screen. The room will be empty. Type the lines of code shown in Fig. 2.5 in a new editor screen and then press the run button to execute the program. You will see the screen in Fig. 2.6 (notice the color, heading, and size of the robot).
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NOTE: The rLocate command and the End statement use capitalization to make them easier to read. RobotBASIC does not care what combination of lower and uppercase lettering you use in writing the commands. However, there are situations where the combination matters. These will be detailed in the appropriate sections.
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That s all; you have just created a program to create a robot. But you will, of course, need to make the robot move and turn. Remember that you need to always rLocate the robot before you do any further robot manipulations. If you do not do so, an error will be issued and the program will be halted. 2.4.2 ANIMATING THE ROBOT There are two commands to make the robot move around:
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INTRODUCTION TO ROBOTBASIC
This command makes the robot move nPixels forward or backward in the direction it is facing. The parameter nPixels is a positive or negative whole number. If nPixels is positive the robot will move forward, if it is negative the robot will move backward, maintaining the same heading.
rTurn nDegrees
This command will make the robot turn nDegrees clockwise or counter-clockwise. nDegrees is a whole number. If nDegrees is negative the robot will turn counter-clockwise. If it is positive it will turn clockwise. If the number is 0 no turning will happen. Turning occurs around the center of the robot, so no forward or backward motion will occur while turning.
NOTE:
All the commands and functions that relate to the robot in the RobotBASIC language start with an r. See Sec. C.9 for a list of the commands and functions relating to the robot simulator.
Let us write a program to make the robot move around. Type the lines of code in Fig. 2.7 in a new editor le and press the Run button. This program causes the robot to move and turn. This shows how easy it is to animate the robot. You might wonder what would happen if the robot tries to move beyond the room s boundaries (run into walls), or what if there were objects in the room. Type the program in Fig. 2.8 and run it. The following screen will be the result:
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