Teach Yourself Game Programming in 21 Days/TYGAMES_R.ISO/source/day_07/mousetst.c

C/C++ Source or Header | 1994-07-25 | 5.6 KB | 213 lines

// I N C L U D E S ///////////////////////////////////////////////////////////

#include <dos.h>
#include <bios.h>
#include <stdio.h>
#include <math.h>
#include <conio.h>
#include <graph.h>

// D E F I N E S  ////////////////////////////////////////////////////////////

// mouse sub-function calls

#define MOUSE_INT                0x33 //mouse interrupt number
#define MOUSE_RESET              0x00 // reset the mouse
#define MOUSE_SHOW               0x01 // show the mouse
#define MOUSE_HIDE               0x02 // hide the mouse
#define MOUSE_BUTT_POS           0x03 // get buttons and postion
#define MOUSE_SET_SENSITIVITY    0x1A // set the sensitivity of mouse 0-100
#define MOUSE_MOTION_REL         0x0B // query motion counters to compute
                                      // relative motion

// defines to make reading buttons easier

#define MOUSE_LEFT_BUTTON        0x01 // left button mask
#define MOUSE_RIGHT_BUTTON       0x02 // right button mask
#define MOUSE_CENTER_BUTTON      0x04 // center button mask


// G L O B A L S  ////////////////////////////////////////////////////////////



// F U N C T I O N S /////////////////////////////////////////////////////////

int Squeeze_Mouse(int command, int *x, int *y,int *buttons)
{
// mouse interface, we'll use _int86 instead of inline asm...Why? No real reason.
// what function is caller requesting?

union _REGS inregs, outregs;

switch(command)
      {

      case MOUSE_RESET:
           {

           inregs.x.ax = 0x00; // subfunction 0: reset
           _int86(MOUSE_INT, &inregs, &outregs);
           *buttons = outregs.x.bx; // return number of buttons
           return(outregs.x.ax);    // return overall success/failure

           } break;

      case MOUSE_SHOW:
           {
           // this function increments the internal show mouse counter.
           // when it is equal to 0 then the mouse will be displayed.

           inregs.x.ax = 0x01; // subfunction 1: increment show flag
           _int86(MOUSE_INT, &inregs, &outregs);

           return(1);

           } break;

      case MOUSE_HIDE:
           {
           // this function decrements the internal show mouse counter.
           // when it is equal to -1 then the mouse will be hidden.

           inregs.x.ax = 0x02; // subfunction 2: decrement show flag
           _int86(MOUSE_INT, &inregs, &outregs);

           return(1);

           } break;

      case MOUSE_BUTT_POS:
           {
           // this functions gets the buttons and returns the absolute mouse
           // positions in the vars x,y, and buttons, respectively

           inregs.x.ax = 0x03; // subfunction 3: get position and buttons
           _int86(MOUSE_INT, &inregs, &outregs);

           // extract the info and send back to caller via pointers
           *x       = outregs.x.cx;
           *y       = outregs.x.dx;
           *buttons = outregs.x.bx;

           return(1);

           } break;

      case MOUSE_MOTION_REL:
           {

           // this functions gets the relative mouse motions from the last
           // call and puts them in the vars x,y respectively

           inregs.x.ax = 0x03; // subfunction 11: get relative motion
           _int86(MOUSE_INT, &inregs, &outregs);

           // extract the info and send back to caller via pointers
           *x       = outregs.x.cx;
           *y       = outregs.x.dx;

           return(1);

           } break;

      case MOUSE_SET_SENSITIVITY:
           {
           // this function sets the overall "sensitivity" of the mouse.
           // each axis can have a sensitivity from 1-100.  So the caller
           // should put 1-100 in both "x" and "y" before calling/
           // also "buttons" is used to send in the doublespeed value which
           // ranges from 1-100 also.

           inregs.x.bx = *x;
           inregs.x.cx = *y;
           inregs.x.dx = *buttons;

           inregs.x.ax = 0x1A; // subfunction 26: set sensitivity
           _int86(MOUSE_INT, &inregs, &outregs);

           return(1);

           } break;

      default:break;

      } // end switch

} // end Squeze_Mouse

//////////////////////////////////////////////////////////////////////////////

void main(void)
{

int x,y,buttons,num_buttons;
int color=1;

// put the computer into graphics mode

_setvideomode(_VRES16COLOR); //  640x480 in 16 colors, use microsofts stuff

// initialize mouse

Squeeze_Mouse(MOUSE_RESET,NULL,NULL,&num_buttons);

// show the mouse

Squeeze_Mouse(MOUSE_SHOW,NULL,NULL,NULL);

// exit main loop when user hits a key

while(!kbhit())
     {

     // display some info

     _settextposition(2,0);

     Squeeze_Mouse(MOUSE_BUTT_POS,&x,&y,&buttons);

     printf("Mouse x=%d y=%d   ",x,y);
     printf("\nButtons=%d  ",buttons);
     printf("\nColor = %d  ",color);

     // video easel

     _settextposition(40,0);

     printf("V I D E O  E A S E L - Press any key to exit.");


     if (buttons==1) // draw
        {
        _setcolor(color);
        _setpixel(x-1,y-2);
        _setpixel(x,y-2);
        _setpixel(x-1,y-1);
        _setpixel(x,y-1);
        } // end if draw on

     if (buttons==2) // change color
        {
        if (++color>15) color=0;

        // wait for mouse release

        while(buttons==2)
             {
             Squeeze_Mouse(MOUSE_BUTT_POS,&x,&y,&buttons);
             } // end while

        } // end if draw on

     } // end while

// place the computer back into text mode

_setvideomode(_DEFAULTMODE);

} // end main