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As anyone who has programmed with QBasic knows, it is a fun, easy and ( for it's time ) quite powerful programming tool! Admittedly, it is rather slow, but given that it has never cost a dime, I suppose that's an acceptable concession. As I mentioned, QBasic includes a wide range of simple, powerful commands, although it's one glaring shortcoming is it's complete lack of mouse support!
For the longest time, I had wanted to find a way to use the mouse in my own QBasic programs. While I eventually found several fine examples of code on-line that did in fact interface with the mouse, they all seemed very complicated to me, with multiple sub-routines, functions and procedure calls. So, I decided to 'boil it all down' to the simplest, bare-minimum method, and to my knowledge, what I came up with is still the quickest, easiest way to incorporate mouse functions into a QBasic program!
One might think of my code as a kind of 'black box' or 'plug-in' of sorts; you simply copy my 'Mouse' sub-routine into your program, and it immediately provides rudimentary mouse support! Interfacing with the mouse is then accomplished by way of three simple functions; 'Mouse 1' shows the mouse cursor, 'Mouse 2' hides it again, and 'Mouse 3' reads the mouse's current button status as well as it's location. This information is communicated to the user's program through 3 global variables; 'B' represents the mouse buttons, 'H' contains it's horizontal co-ordinates, and 'V' returns it's vertical co-ordinates. For a 2-button mouse, the variable 'B' will return the following values:
VALUE: BUTTON(S) PRESSED:
0 None
1 Left
2 Right
3 Both
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The following is the actual mouse code segment which provides mouse support:
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
SUB Mouse (Funk) STATIC
SHARED B, H, V
STATIC Crsr
IF Funk = 1 THEN Crsr = 1
IF Funk = 2 AND Crsr = 0 THEN EXIT SUB
IF Funk = 2 AND Crsr = 1 THEN : Crsr = 0
POKE 100, 184: POKE 101, Funk: POKE 102, 0
POKE 103, 205: POKE 104, 51: POKE 105, 137
POKE 106, 30: POKE 107, 170: POKE 108, 10
POKE 109, 137: POKE 110, 14: POKE 111, 187
POKE 112, 11: POKE 113, 137: POKE 114, 22
POKE 115, 204: POKE 116, 12: POKE 117, 203
CALL Absolute(100)
B = PEEK(&HAAA)
H = (PEEK(&HBBB) + PEEK(&HBBC) * 256)
V = (PEEK(&HCCC) + PEEK(&HCCD) * 256)
END SUB
The following statements should be the first two commands in any program which uses this code:
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DEFINT A-Z
DECLARE SUB Mouse (Funk) ' Declare Mouse sub-program.
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Along with this instructable, I have included a bare-bones 'template' of sorts ( 'MOUSE.SUB' ), which contains the Mouse sub-routine and a blank main program, where you would enter your own code, along with a few sample programs; ( 'QBMOUSE.BAS', 'BUTTONS.BAS' and 'PONG3.BAS' ), which should give you enough examples to get you started. Should you have any questions, concerns or just gripes regarding this code, please feel free to contact me at; flurng@gmail.com. I welcome any feedback, and I hope you enjoy creating exciting new mouse-enabled QBasic programs with the help of this sub-routine. When you're ready to begin, read on to the first step, and above all...... Have Fun!!!