From:	Mark Collinson <mark DOT collinson AT unn DOT ac DOT uk>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Mouse programming
Date:	Fri, 18 Jun 1999 15:22:46 +0100
Organization:	University of Northumbria at Newcastle
Lines:	120
Message-ID:	<376A5636.9E45ABA1@unn.ac.uk>
NNTP-Posting-Host:	monkey.unn.ac.uk
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Greeting all,

I am using djgpp to program my mouse in C++. I have attempted to create
a C++ class to do all mouse driver communication. Unfortunately the code
does not seem to work efficiently enough for the mouse to behave
smoothly. I have provide the code below.

Can someone please provide me with a solution or some advice as to how
to improve this code. I am relatively new to C++ so any help would be
gratefully received.

Thanks in advance,
Mark.

#include <iostream.h>
#include <dos.h>

#define mousecall int86(0x33, &inregs, &outregs);

   const int LEFT=0, RIGHT=1, BOTH=2, EITHER=3;
   const int SOFTCURSOR=0, HARDCURSOR=1;

   union REGS inregs, outregs;

   class mouse {
   public:
      mouse();
      void init();
      int numberofbtns() const;
      int detected() const;
      int visible() const;
      void showcursor();
      void hidecursor();
      void getstatus();
      int btnstatus() const;
      int x() const;
      int y() const;
   private:
      int exists;
      int btncount;
      int cursor_displayed;
      int btnstate;
      int btnclicks;
      int column;
      int row;
      int hmovement;
      int vmovement;
   };

   mouse::mouse() {
      init();
   }

   void mouse::init() {
      inregs.x.ax=0;
      mousecall;
      exists=(outregs.x.ax!=0);
      btncount=outregs.x.bx;
   }

   int mouse::numberofbtns() const {
      return btncount;
   }

   int mouse::detected() const {
      return exists;
   }

   int mouse::visible() const {
      return cursor_displayed;
   }

   void mouse::showcursor() {
      inregs.x.ax=0x01;
      mousecall;
      cursor_displayed=1;
   }

   void mouse::hidecursor() {
      inregs.x.ax=0x02;
      mousecall;
      cursor_displayed=0;
   }

   void mouse::getstatus() {
      /* Update private variable members */
      inregs.x.ax=0x03;
      mousecall;
      btnstate=outregs.x.bx;
      column=outregs.x.cx;
      row=outregs.x.dx;
   }

   int mouse::btnstatus() const {
      return btnstate;
   }
	
   int mouse::x() const {
      return column;
   }
	
   int mouse::y() const {
      return row;
   }
		
   int main() {
      mouse rodent;

      cout << rodent.detected() << endl;
      cout << rodent.numberofbtns() << endl;
   
      rodent.showcursor();
      do {
         rodent.getstatus();
      } while (rodent.btnstatus()==0);
      rodent.hidecursor();

      return(0);
   }

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