How to save previous coordinates

[GaPe]

Hi!

I want to move text "Y" with the mouse. Now my main problem is that I just can't figure it out how to save previous coordinates of the text "Y". I need these coordinates for clearing the old text "Y".
Here's my code:

# include <windows.h>
# include <stdio.h>
# include <conio.h>

void clrscr (short x, short y, short EraseLength, short NoOfLines);
void gotoxy (short x, short y);
BOOL SetColor (WORD Color);

int main ()
{
    HANDLE hInput;
    INPUT_RECORD ir;
    DWORD dwRead;
    BOOL Loop = TRUE, FLAG = FALSE;
    short y = 0, x = 0, xPrev = 0, yPrev = 0;

    hInput = GetStdHandle (STD_INPUT_HANDLE);
    clrscr (0, 0, 80, 24); // clear the whole screen
    gotoxy (0, 0);
    printf ("X");
    gotoxy (10, 6);
    printf ("Y");
    x = 10;
    y = 6;
    while (Loop)
    {
        if (ReadConsoleInput (hInput, &ir, 1, &dwRead))
        {
            if (FLAG)
            {
                xPrev = x;
                yPrev = y;
                SetColor (FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN | BACKGROUND_RED);
                clrscr (xPrev, yPrev, 0, 0);
                x = ir.Event.MouseEvent.dwMousePosition.X;
                y = ir.Event.MouseEvent.dwMousePosition.Y;
                FLAG = FALSE;
            }
            if (ir.EventType == MOUSE_EVENT)
            {
                switch (ir.Event.MouseEvent.dwButtonState)
                {
                    case FROM_LEFT_1ST_BUTTON_PRESSED:
                        // exit from program
                        if ( (ir.Event.MouseEvent.dwMousePosition.Y == 0) &&
                             (ir.Event.MouseEvent.dwMousePosition.X == 0) )
                        {
                            Loop = FALSE;
                        }
                        if ( (ir.Event.MouseEvent.dwMousePosition.X == x) &&
                             (ir.Event.MouseEvent.dwMousePosition.Y == y) )
                        {
                             FLAG = TRUE;
                             gotoxy (x, y);
                             printf ("Y");
                        }
                        break;
                }
            }
        }
    }
    return 0;
}
void gotoxy (short x, short y)
{
    COORD coord;

    coord.X = x;
    coord.Y = y;
    SetConsoleCursorPosition (GetStdHandle (STD_OUTPUT_HANDLE), coord);
}
void clrscr (short x, short y, short EraseLength, short NoOfLines)
{
    COORD coord;
    DWORD cCharsWritten;
    CONSOLE_SCREEN_BUFFER_INFO csbi;
    HANDLE hOutput;
    short i = 0;

    hOutput = GetStdHandle (STD_OUTPUT_HANDLE);
    for (i = 0;	i <= NoOfLines; i++)
    {
        coord.X	 = x;
        coord.Y	 = y+i;
        FillConsoleOutputCharacter (hOutput, TEXT (' '), EraseLength, coord, &cCharsWritten);
        GetConsoleScreenBufferInfo (hOutput, &csbi);
        FillConsoleOutputAttribute (hOutput, csbi.wAttributes, EraseLength, coord, &cCharsWritten);
    }
}
BOOL SetColor (WORD Color)
{
    HANDLE hOutput;

    hOutput = GetStdHandle (STD_OUTPUT_HANDLE);	
    return SetConsoleTextAttribute (hOutput, Color);
}

Please, HELP.

[vasanth]

Well use another variable after changinh the value.. When the new coordinates are formed the old value is retained in the varaible... If you got the idea fine.. If not PM me i will help u..

[Zeeshan]

Ok,

First, declare a separate variable (or set of variables) for saving the old coodinates.

Before, the current coordinate variable is changed, save its value in the separate variable for future use as the old coordinates...

[GaPe]

Yes I know that I should use another variable. That's why I have xPrev and yPrev. The problem is that I do not know where to put it.

[Azuth]

Globaly? Outside main?
Static?

[GaPe]

Not that. Where to put them in the main function.

[vasanth]

Ok pal put that as soon as you print something.... And then use the value to remove the text just before printing anything...


So it is like this


gotoxy(x1,y1);
printf(" ");
gotoxy(x,y);
int x1=x;
int y1=y;
printf("Message");
loop


so what happens here is.. It deletes the previous message.. GOt the logicq

[GaPe]

I can't get it working. PLEASE HELP.