g++ ncurses help

fpga — Tue Sep 12, 2006 9:19 am

Author: fpga

Posted: Tue Sep 12, 2006 9:19 am

Code:

#include <curses.h>
/*
run this code as is, noting that all 'sets' print out correctly with their right edges aligned at x=15.

Then change PROBLEM's value to 1 and re-run.

Why does changing b2's 'capacity' to 9 cause it to start printing out
at a position other than x=15?

If I make b2's capacity 8 or 10 I don't get a problem.

Any help in explaining the right shift and how to stop it would be most
appreciated.
Best regards
*/

#define PROBLEM 0

//=============================================
class SetupPad {
public:
WINDOW * ptr; //ie pPad

SetupPad();
~SetupPad() { delwin(ptr); endwin(); }
void linesCols();
};

SetupPad::SetupPad()
{
initscr();
curs_set(0);
};

void SetupPad::linesCols()
{
ptr = newpad(LINES-1,COLS-1);
}
//=============================================
class Set
{
public:
int x,y,cap;
Set(int nx,int ny, int ncap) : x(nx),y(ny),cap(ncap) {}
~Set(){}
};
//=============================================
void drawQ(Set * pS,WINDOW * pWin)
{
int x=pS->x;
int y=pS->y;
char sym = '.';
for (int j=0;j<pS->cap;j++)
   mvwaddch(pWin, y, x--, sym);
}

void updtScn(SetupPad * pPad)
{
prefresh(pPad->ptr,0,0,0,0,LINES-1,COLS-1);
   doupdate();
}

int main()
{
SetupPad pad;
pad.linesCols();
Set b1(15,1,13);
Set m1(15,2,10);
Set m2(15,3,10);

#if PROBLEM
Set b2(15,4,9);
#else
Set b2(15,4,10); //works with 8 too!
#endif

drawQ(&b1,pad.ptr);
drawQ(&m1,pad.ptr);
drawQ(&m2,pad.ptr);
drawQ(&b2,pad.ptr);
updtScn(&pad);
for (int i=0;i<1000000000;i++); //delay so you can see it
return 0;
}

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g++ ncurses help