how can i let the user draw lines by clicking on the screen once and the line always be seen from that point to the mouse without erase the background - i tried to allocate the screen so i could return to the background everytime the mouse moves and print the line on it.. but the allocation is too big for the memory..
(borland c)
what should i do then??
You sure like to keep us guessing. Borland C. which version? what operating system? are you writing a gdi windows program, a console program,a dos program,a bgi program. If you really want help from us then help us to help you by giving us the correct information.(borland c)
what should i do then??
What code do you have so far? what exactly about your code isnt working. My c/c++ skills are ok but my telepathy and psychic skills leave much to be desired.
Free the weed!! Class B to class C is not good enough!!
And the FAQ is here :- http://faq.cprogramming.com/cgi-bin/smartfaq.cgi
borland c 3.1
os: windows xp
a dos program
sorry about not giving the information earlier...
here is a simple code that i tried that fails at the allocation part because of low memory....
the resulution is 640,480;
void main()
{
graphics(); //calls initgraph
openscr(); //draws an image on screen
unsigned int picsize;
void *pic;
picsize=imagesize(0,0,400,400);
pic=malloc (picsize);
if (!pic) printf ("memory error");
getimage (0,0,400,400);
cleardevice();
setbkcolor(0);
getch();
putimage (0,0,pic,XOR_PUT);
getch();
free (pic);
}
it succeed to allocate 300*300 but not a larger part of screen such as 400*400;
As Salem said, an newer compiler is the best solution.
But you could try:
Code:#include <alloc.h> int main() { graphics(); //calls initgraph openscr(); //draws an image on screen unsigned int picsize; void far *pic; picsize=imagesize(0,0,400,400); pic=farmalloc ((unsigned long) picsize); if (!pic) printf ("memory error"); getimage (0,0,400,400); cleardevice(); setbkcolor(0); getch(); putimage (0,0,pic,XOR_PUT); getch(); farfree (pic); return 0; }
thank you salem and you swoopy: thank you both for your time!
