/* ---------------------ShowTch.c-------------------*
* *
* Module: ShowTch.c *
* Purpose: To provide a demonstration about how *
* to use function GetTouch(). *
* Author: W. Harvey Gray *
* Compiler: Microsoft 5.0 *
* *
* Functions: (extern) *
* main *
* *
* Variables: There are no external variables used *
* or defined by this module. *
* *
* Copyright 1992, W. Harvey Gray. May be used *
* freely, if authorship and publication are *
* acknowledged. *
* *
*--------------------------------------------------*/
#include <bios.h>
#include <conio.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "dvrfunc.h"
#include "GetTouch.h"
/*--------------------------------------------------*
* static prototypes *
*--------------------------------------------------*/
static void print_touch( void );
static void touch_loop( void );
/*------------------------------------------------*
* extern function main() *
*------------------------------------------------*/
int main( int argc, char **argv ) {
/*------------------------------------------------*
* Purpose: *
* *
* Demonstrates a simple routine that reads a *
* complete touchscreen touch and prints its *
* statistics. *
* *
*------------------------------------------------*/
struct infodata *pinfo;
puts( "ShowTch V1.0" );
puts( "A test program for function GetTouch." );
if ( ! finddriver() ) { /* Check for ELODEV. */
puts( "\nELODEV not installed." );
exit( 1 );
}
/*--------------------------------------------*
* Check for correct device driver version. *
*--------------------------------------------*/
pinfo : malloc( sizeof( struct infodata ) );
driverinfo( pinfo );
if ( ( pinfo->driverversionmajor * 10 +
pinfo->driverversionminor ) < 14 ) {
puts( "\nELODEV not >= version 1.4" );
exit( 2 );
}
free( pinfo );
/*--------------------------------------------*
* Startup the touchscreen device driver. *
*--------------------------------------------*/
setmode( BUFFERED | UNTOUCH | STREAM );
opentouch();
enabletouch();
initdelay();
/*--------------------------------------------*
* Set the button radius to be 4% of the *
* diagonal dimension of the touchscreen. *
*--------------------------------------------*/
InitializeTouch();
SetButtonRadius( 4096/25 );
/*--------------------------------------------*
* Continue reading touches until the key- *
* board is hit. *
*--------------------------------------------*/
while ( ! _bios keybrd( _KEYBRD_READY ) )
touch_loop();
/* Flush keyboard buffer. */
while ( _bios_keybrd( _KEYBRD_READY ) )
getch();
closetouch();
exit( 0 );
}
/*-------------------------------------------------*
* static function print_touch() *
*-------------------------------------------------*/
static void print_touch( void ) {
/*-------------------------------------------------*
* Purpose: *
* *
* Print the touch statistics. *
* *
*-------------------------------------------------*/
struct touchit *pti;
pti = TouchInfo();
printf( "\nTouch pts = %d;", pti->n );
printf( "\n (X,Y)cen = (");
printf( "%5d,", pti->xcen );
printf( "%5d);", pti->ycen );
printf( "\n Push button = %s.",
( (pti->button) ? "True" : "False" ) );
return;
}
/*-------------------------------------------------*
* static function touch_loop() *
*-------------------------------------------------*/
static void touch_loop( void ) {
/*-------------------------------------------------*
* Purpose: *
* *
* Read an entire touch and print its statistics *
* when an untouch point is received. *
* *
*-------------------------------------------------*/
boolean button;
boolean touched;
struct touchxy *ptouch;
/*----------------------------------------------*
* Service one complete touch. *
*----------------------------------------------*/
touched = FALSE;
do {
if (( ptouch = GetTouch( &button )) !=
(struct touchxy *) NULL ) {
touched = TRUE; /* Touch point recv'd */
if ( ptouch->ut ) { /* Is a untouch? */
print_touch();
printf(" (Press any key to stop.)" );
break; /* Finished with touch. */
}
}
}
while ( touched );
return;
}
/* End of file. */