Attachment 53817 Details for Bug 43191 – A program to draw red/green rectangles using raw X11. Compile as gcc -o rectangle rectangle.c -lX11

A program to draw red/green rectangles using raw X11. Compile as gcc -o rectangle rectangle.c -lX11

rectangle.c (text/plain), 1.93 KB, created by Simon Farnsworth on 2011-11-23 11:07:44 UTC

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Description:

Filename:

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Creator: Simon Farnsworth

Created: 2011-11-23 11:07:44 UTC

Size: 1.93 KB

patch

obsolete

>#include <X11/Xlib.h>
>#include <stdio.h>
>#include <stdlib.h>
>
>int main( int argc, char *argv[] )
>{
>    if( argc != 5 )
>    {
>        fprintf( stderr, "Usage: %s <x offset> <width> <red_height> <green_height>\n", argv[0] );
>        exit(EXIT_FAILURE);
>    }
>
>    int x = atoi( argv[1] );
>    unsigned width = atoi( argv[2] );
>    unsigned red_height = atoi( argv[3] );
>    unsigned green_height = atoi( argv[4] );
>
>    Display *display = XOpenDisplay( NULL );
>    int screen = DefaultScreen( display );
>    Window window = XCreateSimpleWindow( display,
>                                         RootWindow( display, screen ),
>                                         x, 0,
>                                         width, red_height + green_height,
>                                         0,
>                                         WhitePixel( display, screen ), WhitePixel( display, screen ) );
>
>    XSelectInput( display, window, ExposureMask );
>
>    XMapWindow( display, window );
>
>    GC gc;
>    gc = XCreateGC( display, window, 0, NULL );
>
>    unsigned long red;
>    unsigned long green;
>    {
>        XWindowAttributes attrs;
>        XColor col;
>        XGetWindowAttributes( display, window, &attrs );
>        XAllocNamedColor( display, attrs.colormap, "#f00", &col, &col );
>        red = col.pixel;
>        XAllocNamedColor( display, attrs.colormap, "#0f0", &col, &col );
>        green = col.pixel;
>    }
>
>    while( 1 )
>    {
>        XEvent event;
>        XNextEvent( display, &event );
>        switch( event.type )
>        {
>        case Expose:
>            // Draw
>            XClearWindow( display, window );
>            XSetForeground( display, gc, red );
>            XFillRectangle( display, window, gc, 0, 0, width, red_height );
>            XSetForeground( display, gc, green );
>            XFillRectangle( display, window, gc, 0, red_height, width, green_height );
>            break;
>        default:
>            // Do nothing
>            break;
>        }
>    }
>}

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Attachments on bug 43191: 53797 | 53817 | 53820 | 53821 | 53822 | 53906 | 53912 | 54028 | 54396 | 54397 | 54398

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