My goal is to open a window in the X-server and plot a series of pixels. However, I find many examples I have tried to draw to a window fail and the window remains blank. Therefore, I am here requesting information. I do not know c, and am a beginner. Currently, I am using a mix-match of code, running against the gcc compiler finding errors and fixing them as I go along. I have experienced segmentation faults, but the following code produces a minimal amount of error.
The result of this code, is to open a window (which it does) for 5 seconds/cycles, and also plot a series of pixels half the length of the width and height specified.
However, what actually happens is it opens a window with a black background, plots nothing, and I am left frustrated with little resources. I suspect the problem may lie in either XCreateImage, or XPutPixel commands. I suspect I have not got the right values for either command.
Can anyone here offer a simple solution to my problem of wanting to plot pixels to a window?
Finally - I would like to elabroate on my plans...
I intend to further the pixel plotting using double buffering, for a simple animation routine I written in PHP graphics. As animation is not available in PHP, this is the reason for myself attempting c coding without any prior knowledge of the c language. However, I do have a basic grasp of BASIC (if, for, while etc), and constant/variable declaration (int, long, double etc).
Please can someone enlighten me with a code snippet as to how I can accomplish my goal of plotting individual pixels to the screen.
For some reason I cannot access any other color than blue. I would also like to apologise for posting a Linux question in the Unix forum. :/
However, my code has advanced and I would like to share the program I wanted to write.
This program is a simple animatiion that compiles without error with gcc. I am really proud of my work, I just wish I had access to more than one color. For some reason, I can only use blue.
EDIT: After reading yet another Xlib tutorial I discovered how to allocate colors. I still do not understand how to utilize these colors for above animation, but I am getting there...
Hello,
I was just wondering why XGetGeometry() would cause a hang in an application.
In the xlib book it says any of there "Get" functions don't necessarily return immediately.
Is there a way to make a it return immediately or other functions that will give me the same results.
I... (1 Reply)
hi ..
I tried to create a new account with useradd leghorn (being in root)
Also I gave a password for the same using passwd leghorn.
So when I go su legorn, it doesnt prompt for the password.
Kindly drop in your valuable comments
~cheers (9 Replies)
So I'm pretty much a n00b when it comes to Unix but I've decided to give it a shot. I managed to install FreeBSD 6.2 on one partition of my hard drive on my laptop. During the installation I choose to install KDE, not wanting to deal with a non GUI operating system right away! However, whenever I... (1 Reply)
Hi all,
Just writing to know how to approach the situation. I am currently with 2+ exp in a support environment in Unix..mostly on the application side..have not done any Sysadmin work..
My interest is to move towards Unix admin or towards Storage/Networking side..But the problem is that my... (1 Reply)
hi everybody
i installed FreeBSD 5.x on a box with a video card Diamond SpeedStar A90 and a Fujitsu Siemens Monitor B772-1
when i do "startx" it gives me something like this:
fatal error: no devices detected
no screen detected
i'm lost...i don't know what to... (3 Replies)
Anyone who have any ideas how-to make X faster.
I have a ATI Rage Mobility P/M AGP 2x card and I wanto get it fast, mostly for movie playback and so.
Is there OpenGL and GLX support?
regards
Esaia (1 Reply)
My new Pro Keyboard works great, but the power switch on the computer won't turn the computer on! It's an older model, a Revision D iMac (333), but I know I've used the computer-mounted power switch to power the machine down before. Am I missing something? (1 Reply)
I have a situation where there are two SCO R5 Open Server Unix boxes in a remote location. The two boxes are inter-related via NFS mounts. My problem occurs when one of the boxes goes down, the NFS relationship stops the remaining machine from carrying on, even though it would be able to do so if... (2 Replies)