vb.net barcode scan event Commands with a * have additional functionality are explained in App. D. in Software

Paint QR Code ISO/IEC18004 in Software Commands with a * have additional functionality are explained in App. D.

Commands with a * have additional functionality are explained in App. D.
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*rLocate ExprN1,ExprN2,{ExprN3,{ExprN4, {ExprN5}}} Creates robot of speci ed radius (ExprN4) and color (ExprN5) at speci ed position (ExprN1,ExprN2) and heading (ExprN3).
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APPENDICES
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If you need to specify ExprN4, you must also specify ExprN3 and so on. ExprN3/4/5 are optional. The heading defaults to 0 (north), size defaults to 20 pixels and color defaults to blue. The size is limited to between 5 and 50 pixels. The size value is the radius of the robot so a radius of 20 means a diameter of 40. This command must be executed before any other robot functions or commands. It is the command that creates the robot, places it on the ground and switches it on. If you issue any commands/functions before this command an error will be issued and the program will halt. The size of the robot should be considered in relation to the screen size. The screen is 800 600 pixels. So if you consider a room of 20 ft then each pixel is 1/3 in. So a robot of 20 pixels radius is 12 in in diameter. Which is a reasonable robot size, but you can specify a smaller or larger size. If you locate the robot over a color other than the oor color, or if you change the oor color from the default screen color you must issue an rFloorColor command (see below) before you attempt any movement of the robot. rInvisible ExprN {,ExprN...} This command sets the list of colors that will not be considered as objects when encountered by the robot while moving and also by many of the sensors as speci ed. You must pass at least one color and a maximum of 15 colors is allowed. The colors are according to the colors speci ed in the Constants help page within the IDE. The rst color in the list you specify is special in that it will be used as a default color for the rPen command and rSense() function if you do not specify a color when you issue the command or call the function (see below). The second color in the list is also special in that it will be the default color if you do not specify a color for the rDFeel() and rDBumper() functions. Commands or functions that look or sense for colors will not detect the colors on the invisible colors list unless otherwise stated. rFloorColor ExprN Sets the color that will be considered as the oor and will not affect sensors or the rForward command. *rForward ExprN The robot moves in the direction it is heading ExprN pixels forward if ExprN is positive, or backwards if ExprN is negative. This command will cause an error if the robot tries to move into objects of any color not listed in the list of invisible colors (see the rInvisible command). This command will cause an error if the battery is depleted and an IgnoreCharge False has been issued. *rTurn ExprN This will cause the robot to turn ExprN degrees right (clockwise) if ExprN is positive and left (counterclockwise) if ExprN is negative. This command will cause an error if the battery is depleted and an IgnoreCharge False has been issued. rHeading ExprN Sets the robot heading to ExprN (0 359). Zero is facing up on the screen (north), 90 is facing right (east), and so on.
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COMMANDS, FUNCTIONS, AND OTHER DETAILS
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rSpeed ExprN Sets the robot speed. The larger the number the slower the robot. ExprN must be >= 0. *rGps Var1,Var2 Sets Var1 to the Robot s current x position and Var2 to the y position, giving the robot s position on the screen. This command will not cause an error if the battery is depleted and an IgnoreCharge False has been issued, but the returned values will be 0. *rPen ExprN1 {,ExprN2} The robot has a pen positioned at its center that can be put up or down using this command. When the pen is down the robot will draw a line using the color speci ed in ExprN2. If you do not specify ExprN2 then the rst color speci ed in the list of invisible colors (see rInvisible above) is used. If you have not speci ed a list of invisible colors then the pen will draw using the oor color, which means that you will not see the trace when it is over the oor color. The width of the drawn line is determined by the current line width set by the drawing commands (see LineWidth ExprN, Sec. C.7). If ExprN1 is zero then the pen will be raised. If ExprN1 is not zero then the pen will be lowered and drawing will take place. You can use the constants Down and Up so you can say:
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