io Programmo 23/IOPROG_23.ISO/SOFT/3DENGINE.ZIP/Eventmgr.cpp

C/C++ Source or Header | 1996-05-07 | 4.6 KB | 169 lines

// EVENTMGR.CPP
//
// A set of high-level functions to monitor input from
// the keyboard, the joystick and the mouse. The getevent()
// function is specific to the events required by GARDENS.PRJ.
//
// Written by Christopher Lampton for
// GARDENS OF IMAGINATION (Waite Group Press,1994)

#include <iostream.h>
#include    <stdio.h>
#include  <dos.h>
#include    "io.h"
#include    "eventmgr.h"

// Constant definition:

const GAMEPORT=0x0201;

// Variable declarations

int x,y;    // All purpose coordinate variables
int xmin,xmax,xcent,ymin,ymax,ycent; // Joystick cali-
                                                 // bration variables
char far keybuffer[256]; // Buffer for 256 scan codes
int lastkey=0,keycount=0;    // Keyboard variables

void init_events()
// Initialize event manager
{
  initkey(keybuffer); // Install alternate keyboard driver
    initmouse();          // Initialize the mouse driver
    rempointer();          // Remove mouse pointer from screen
}

void setmin()
// Set minimum joystick coordinates
{
  while (!readjbutton(JBUTTON1)); // Loop until joystick
                                             //  button pressed
  for (long i=1; i<100000; i++);  // Brief delay
  xmin=readstick(JOY_X);          // Get x coordinate
  ymin=readstick(JOY_Y);          // Get y coordinate
  while (readjbutton(JBUTTON1));  // Loop until button
                                             //  released
}

void setmax()
// Set maximum joystick coordinates
{
  while (!readjbutton(JBUTTON1)); // Loop until joystick
                                             //  button pressed
  for (long i=1; i<100000; i++);  // Brief delay
  xmax=readstick(JOY_X);          // Get x coordinate
  ymax=readstick(JOY_Y);          // Get y coordinate
  while (readjbutton(JBUTTON1));  // Loop until button
                                             //  released
}

int joystick_present()

// Function to detect presence of joystick, as follows:
//
// 0 - no stick
// 1 - stick 1 present
// 2 - stick 2 present
// 3 - both sticks present
//
// Adapted from code written by Mark Betz for
// Flights of Fantasy (Waite Group Press, 1993)

{
  int mask=0;

  // Joystick 1 present?

  outportb(GAMEPORT,0);
  for(unsigned int i=0; i<65535; i++)
     if ((inportb(GAMEPORT) & 1) == 0) break;
  if (i !=65535) mask = mask | 1;

  // Joystick 2 present?

  outportb(GAMEPORT,0);
  for(i=0; i<65535; i++)
     if ((inportb(GAMEPORT) & 2) == 0) break;
  if (i !=65535) mask = mask | 2;

  return (mask);
}

void end_events()
// Terminate event manager routines
{
  remkey();
}

void setcenter()
// Set center joystick coordinates
{
  while (!readjbutton(JBUTTON1)); // Loop until joystick
                                             //  button pressed
  for (long i=1; i<100000; i++);  // Brief delay
  xcent=readstick(JOY_X);         // Get x coordinate
  ycent=readstick(JOY_Y);         // Get y coordinate
  while (readjbutton(JBUTTON1));  // Loop until button
                                             //  released
}

void calibrate_stick(void)
{
    cout << "Joystick detected. \n";
    cout << "CENTER the joystick and press button 1:\n";
    setcenter();
    cout << "Move the joystick to the UPPER LEFT corner and press button 1:\n";
    setmin();
    cout << "Move the joystick to the LOWER RIGHT corner and press button 1:\n";
    setmax();
}

void getevent(int event_mask,event_struct *events)
// Get events from devices selected by EVENT_MASK
{

    // Clear any events in structure:

    events->go_forward = 0;
    events->go_back = 0;
    events->go_left = 0;
    events->go_right = 0;
    events->fire = 0;
    events->abort = 0;
    events->pause = 0;
    events->resize = 0;
    events->open_door = 0;

    // If joystick events requested....
    if (event_mask & JOYSTICK_EVENTS) {
        if (readstick(JOY_Y)<(ycent-100)) events->go_forward = 1;
        if (readstick(JOY_Y)>(ycent+100)) events->go_back = 1;
        if (readstick(JOY_X)<(xcent-100)) events->go_left = 1;
        if (readstick(JOY_X)>(xcent+100)) events->go_right = 1;
        if (readjbutton(JBUTTON1)) events->fire = 1;
    }
    // If mouse events requested....
    if (event_mask & MOUSE_EVENTS)
    {
        relpos(&x,&y);    // Read relative mouse position
        if (y < -5) events->go_forward = 1;
        if (y > 5) events->go_back = 1;
        if (x < -20) events->go_left = 1;
        if (x > 20) events->go_right = 1;
        int b=readmbutton();    // Read mouse button
        if (b & LMBUTTON) events->fire = 1;
    }
    // If keyboard events requested....
    if (event_mask & KEYBOARD_EVENTS) {
        if (keybuffer[FORWARDKEY]) events->go_forward = 1;
        if (keybuffer[BACKKEY]) events->go_back = 1;
        if (keybuffer[LEFTKEY]) events->go_left = 1;
        if (keybuffer[RIGHTKEY]) events->go_right = 1;
        if (keybuffer[QUITKEY]) events->abort = 1;
        if (keybuffer[P]) events->pause = 1;
        if (keybuffer[F3]) events->resize = 1;
        if (keybuffer[SPACE]) events->open_door = 1;
    }
}