I created a 2D array called it image_1; then did two loops for height & width that incremented by 10 & assigned them to 1. But the image doesn't show as bar image just a black image.. Any advice how to create a bare mesh image...

Please show code.

You should do clear_to_color(your background colour), before the for loop, and, unless you use 8 bit graphics you should assign them to makecol(red, green, blue). If you are using 8 bit graphics you should check what is in palette position 1.

EDIT:
You did put a spot or draw a line at the specified position, I assume. And yeah, code would help.

Also, make sure that the loops aren't nested inside each other else it will slow it down and might cause your problem.

thanks for your reply guys & here is my code thanks inadvance for ur helps...

Here is the code you posted: (you can use code tags to show itin your post (check out the mockup link))

// after I created 2D array
// just intialize the image to zero
for (i=0; i< width; i++){
    for (j=0; j<height; j++){
        out_image[j]<i>=0;
    }
}

for (i=0; i< width; i=i+50){
    for (j=0; j<height; j=j+50){
        out_image[j]<i>=1;
    }
}

In all honesty, I don't really know what you're trying to achieve. The code above does nothing except setting every 50 pixel in an array to 1.

If you want to place dots on a bitmap, you'd have to do something like this:

BITMAP *bmp;
bmp = create_bitmap(640, 480); // or whatever size
clear_to_color(bmp, makecol(0, 0, 0)); // makes it all black
for (i=0; i< width; i=i+50){
    for (j=0; j<height; j=j+50){
        putpixel(bmp, j, i, makecol(255, 255, 255)); // makes the pixel white
    }
}
blit(bmp, screen, 0, 0, 0, 0, bmp->w, bmp-h);  // show image on screen

Or are you trying to do something else?

Thanks for ur tips but I am not quite sure if this is the answer of my qs cause I am trying to draw a mesh bar image so, all I was trying to make the background =0 & the bars in horizontal & vertical =1( as a white color or verse versa). I did similar thing in matlab & worked out greatly but in C++ didn't work( I am just a new programmer in C++). & all I am getting just verticals lines with the dark dots in the crossing lines .In ur code, when u made background =0 why u used 3 parameters (0, 0, 0)??? & does of each command u used should I create a function for it.. excuse me, my qs might seem dump but as I mentioned just beginner person in using C++ ..

From reading this thread, it appears the helwa_1 wants to have a mesh with lines every 50 pixels. James Stanely's pseudo code is a start to what helwa_1 is attempting to achieve.

Here's some untested hybrid code based on James's pseudo code and John's code :

BITMAP *bmp;
bmp = create_bitmap(640, 480); // or whatever size
clear_to_color(bmp, makecol(0, 0, 0)); // makes it all black

// Vertical lines
for (i=0; i< width; i=i+50)
  vline(bmp, i, 0, bmp->h, makecol(255, 255, 255));

// Horizontal lines
for (j=0; j<height; j=j+50)
  hline(bmp, 0, j, bmp->w, makecol(255, 255, 255));    }

blit(bmp, screen, 0, 0, 0, 0, bmp->w, bmp-h);  // show image on screen

[edit]
The 3 parameters are the red, green and blue values of the colour. See the manual for details.
[/edit]

Actually, I think he wants them every 10 pixels, based on this line:

Heh, well spotted. So OP can't write and work from his own specs?

Thanks a lot :O.. now I got it & it is working excellent....
appreciate all ur help;D...

No worries.

[edit]
took out greedy part of comment
[/edit

An 'optimisation' to make it cleaner:
Instead of i=i+10, use i += 10