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ReadMouse Var1,Var2,Var3
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When the command is executed Var1 and Var2 are lled with the screen coordinates of where the mouse cursor is when the command is executed (0, 0 is the top left corner). Var3 will be lled with a value that speci es which mouse button was pressed and in what combination with the Shift, Alt, or Ctrl keys. Read Sec. C.7 for details of these codes. When the command executes it does not pause the program or wait for the user to press anything. If the user happens to be pressing the mouse buttons then Var3 will be set to the code, if not then it is set to 0. If the cursor is inside the terminal screen then Var1 and Var2
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will be lled with the cursor s position. If the cursor is outside the terminal screen when this command executes, the values in Var1 and Var2 will be the last valid values obtained from the mouse. This information can be useful for knowing how the mouse exited the screen. 4.1.4 OUTPUT TO THE SCREEN There are many commands for sending output text and numbers to the user. In this section we will only be concerned with two of them (see Secs. B.7 and C.3 for details on expressions): 4.1.4.1 Print {Expr,Expr;...} This command writes out to the screen the results of the expressions. The rst time you issue a Print the rst line on the screen will be used, the next time will use the second line, and so on. Once the last line is reached the next time a Print command is executed the screen will scroll one line up and the data is printed on the last line. The comma (,) is used to display the output using no spaces between the expressions and the semicolon (;) puts a tab space between them. Read Sec. C.7 for more details. 4.1.4.2 XYString X,Y, Expr{,Expr;...} This command writes out to the screen the results of the expressions. Values X, Y are screen coordinates in pixels where the output will be printed. Read Sec. C.7 for more details. This command is just like Print but it puts the text on a particular screen coordinate. No scrolling occurs. 4.1.5 LOOPS In programs it is often necessary to repeat execution of some lines of code a certain number of times or while a certain condition is true or until a certain condition becomes true. For example, if you want to print the numbers 1 through to 10, you can have 10 separate print statements like Print 1, then Print 2, and so on. Or you could write:
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for I = 1 to 10 Print I next
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In this method you have written 3 lines instead of 10. Imagine if you wanted to print 1 to 100. You can appreciate the savings in time and space. Imagine you want to print a random number every time the user presses a key but if she/he presses the key q you want to stop. You cannot use the above since you do not know how many numbers the user needs. You can use this:
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K = 0 while K < > Ascii( q ) Print Random(1000) Waitkey K wend
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This way the program keeps repeating the printing and waiting for a key until the user presses the q button. The function Random (n) is used to generate a random number from
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0 to n 1. Also the function Ascii() is used to get the code value of the letter q which is the value returned by the WaitKey command inside the variable K when the user presses the q button. Notice how the variable K had to be initialized before entering the loop. This is because the condition for the loop checks to see if K is not equal to the code for q, and if K has not been de ned yet you would get an error. Another way to do exactly the same thing is:
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repeat Print random(1000) WaitKey K until K = Ascii( q )
Notice that K did not have to be initialized this time. This is because K is not used until after it has been assigned a value by the command WaitKey. Otherwise this ow-control structure is very similar to the one above. Notice the condition for the while-wend is exactly opposite to the one in the repeat-until. Here is another way to do the same as above but this time instead of checking for the condition to exit out of the loop, in the loop itself we will use an if-statement to decide when to break out of the loop. This has an advantage if the condition for exiting the loop is one that is not easily testable in one place in the program or is not suitable to be tested only once at the top (or bottom) of the loop. Let s say we want the loop to nish if the user presses Q or q. We can do this:
while True Print Random(1000) Waitkey K if K=Ascii( q ) then break if K=Ascii( Q ) then break wend repeat Print Random(1000) Waitkey K if K=Ascii( q ) then break if K=Ascii( Q ) then break until False
The Break command causes the program ow to go to the line right after the wend (or until) statement, effectively ending the loop. Notice that you do not need to assign a value for K before entering the while-loop since you do not use the variable before it is de ned. Also, notice that the condition for ending the loop is True (False for the repeat-until), which means that the loop will never end unless a Break is executed. The above is just an example. A better way to accomplish the same action would be:
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