Building Mouse Cursors

main( )

{

int gd = DETECT, gm, button, x, y, area, i, choice ;

char *p ;

initgraph ( &gd, &gm, "c:\\tc\\bgi" ) ;

if ( initmouse( ) == 0 )

{

closegraph( ) ;

puts ( "Mouse not installed!" ) ;

exit ( 1 ) ;

}

for ( i = 0 ; i <4 ; i++ )

{

changecursor ( c[i] ) ;

showmouseptr( ) ;

getmousepos ( &button, &x, &y ) ;

area = imagesize ( x - 15, y - 7, x + 32, y + 24 ) ;

p = malloc ( area ) ;

if ( p == NULL )

exit( ) ;

getimage ( x - 15, y - 7, x + 32, y + 24, p ) ;

putimage ( i * 48 + 1, 1, p, COPY_PUT ) ;

rectangle ( i * 48, 0, ( i + 1 ) * 48, 33 ) ;

hidemouseptr ( ) ;

}

gotoxy ( 10, 25 ) ;

printf ( "Press any key to exit..." ) ;

choice = 1 ;

disp ( choice, p ) ;

changecursor ( c[choice - 1] ) ;

showmouseptr( ) ;

while ( !kbhit( ) )

{

getmousepos ( &button, &x, &y ) ;

if ( ( button & 1 ) == 1 )

{

for ( i = 0 ; i <4 ; i++ )

{

if ( choice - 1 == i )

continue ;

if ( y > 0 && y <33 )

{

if ( x > i * 48 && x <( i + 1 ) * 48 )

{

hidemouseptr( ) ;

disp ( choice, p ) ;

choice = i + 1 ;

disp ( choice, p ) ;

changecursor ( c[choice - 1] ) ;

showmouseptr( ) ;

}

}

}

}

}

getch( ) ;

}

disp ( int choice, char *p )

{

getimage ( ( choice - 1 ) * 48 + 1, 1, choice * 48, 32, p ) ;

putimage ( ( choice - 1 ) * 48 + 1, 1, p, NOT_PUT ) ;

}

initmouse( )

{

i.x.ax = 0 ;

int86 ( 0x33, &i, &o ) ;

return ( o.x.ax )

}

showmouseptr( )

{

i.x.ax = 1 ;

int86 ( 0x33, &i, &o ) ;

}

hidemouseptr( )

{

i.x.ax = 2 ;

int86 ( 0x33, &i, &o ) ;

}

restrictmouseptr ( int x1, int y1, int x2, int y2 )

{

i.x.ax = 7 ;

i.x.cx = x1 ;

i.x.dx = x2 ;

int86 ( 0x33, &i, &o ) ;

i.x.ax = 8 ;

i.x.cx = y1 ;

i.x.dx = y2 ;

int86 ( 0x33, &i, &o ) ;

}

getmousepos ( int *button, int *x, int *y )

{

i.x.ax = 3 ;

int86 ( 0x33, &i, &o ) ;

*button = o.x.bx ;

*x = o.x.cx ;

*y = o.x.dx ;

}

Freehand Drawing Using Mouse

Let us now try to gather all that we know about the mouse and its functions to develop a utility for drawing freehand... the way it is done in softwares like Paintbrush, CorelDraw etc. Here is the program...

#include "dos.h"

#include "graphics.h"

union REGS i, o ;

main( )

{

int gd = DETECT, gm, maxx, maxy, x, y, button, prevx, prevy ;

initgraph ( &gd, &gm, "c:\\tc\\bgi" ) ;

maxx = getmaxx( ) ;

maxy = getmaxy( ) ;

rectangle ( 0, 0, maxx, maxy ) ;

setviewport ( 1, 1, maxx - 1, maxy - 1, 1 ) ;

if ( initmouse( ) == 0 )

{

closegraph( ) ;

restorecrtmode( ) ;

printf ( "Mouse driver not loaded" ) ;

exit ( 1 ) ;

}

restrictmouseptr ( 1, 1, maxx - 1, maxy - 1 ) ;

showmouseptr( ) ;

while ( !kbhit( ) )

{

getmousepos ( &button, &x, &y ) ;

if ( ( button & 1 ) == 1 )

{

hidemouseptr( ) ;

prevx = x ;

prevy = y ;

while ( ( button & 1 ) == 1 )

{

line ( prevx, prevy, x, y ) ;

prevx = x ;

prevy = y ;

getmousepos ( &button, &x, &y ) ;

}

showmouseptr( ) ;

}

}

}

initmouse( )

{

i.x.ax = 0 ;

int86 ( 0x33, &i, &o ) ;

return ( o.x.ax )

}

showmouseptr( )

{

i.x.ax = 1 ;

int86 ( 0x33, &i, &o ) ;

}

hidemouseptr( )

{

i.x.ax = 2 ;

int86 ( 0x33, &i, &o ) ;

}

restrictmouseptr ( int x1, int y1, int x2, int y2 )

{

i.x.ax = 7 ;

i.x.cx = x1 ;

i.x.dx = x2 ;

int86 ( 0x33, &i, &o ) ;

i.x.ax = 8 ;

i.x.cx = y1 ;

i.x.dx = y2 ;

int86 ( 0x33, &i, &o ) ;

}

getmousepos ( int *button, int *x, int *y )

{

i.x.ax = 3 ;

int86 ( 0x33, &i, &o ) ;

*button = o.x.bx ;

*x = o.x.cx ;

*y = o.x.dx ;

}