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Diffstat (limited to 'help/simple-text.c')
| -rw-r--r-- | help/simple-text.c | 173 |
1 files changed, 0 insertions, 173 deletions
diff --git a/help/simple-text.c b/help/simple-text.c deleted file mode 100644 index d4a986c..0000000 --- a/help/simple-text.c +++ /dev/null @@ -1,173 +0,0 @@ -/* - * simple-text.c - demonstrate drawing of text strings on a window. All - * drawings are done in black color over a white background. - */ - -#include <X11/Xlib.h> - -#include <stdio.h> -#include <stdlib.h> /* getenv(), etc. */ -#include <unistd.h> /* sleep(), etc. */ - -/* - * function: create_simple_window. Creates a window with a white background - * in the given size. - * input: display, size of the window (in pixels), and location of the window - * (in pixels). - * output: the window's ID. - * notes: window is created with a black border, 2 pixels wide. - * the window is automatically mapped after its creation. - */ -Window -create_simple_window(Display* display, int width, int height, int x, int y) -{ - int screen_num = DefaultScreen(display); - int win_border_width = 2; - Window win; - - /* create a simple window, as a direct child of the screen's */ - /* root window. Use the screen's black and white colors as */ - /* the foreground and background colors of the window, */ - /* respectively. Place the new window's top-left corner at */ - /* the given 'x,y' coordinates. */ - win = XCreateSimpleWindow(display, RootWindow(display, screen_num), - x, y, width, height, win_border_width, - BlackPixel(display, screen_num), - WhitePixel(display, screen_num)); - - /* make the window actually appear on the screen. */ - XMapWindow(display, win); - - /* flush all pending requests to the X server. */ - XFlush(display); - - return win; -} - -GC -create_gc(Display* display, Window win, int reverse_video) -{ - GC gc; /* handle of newly created GC. */ - unsigned long valuemask = 0; /* which values in 'values' to */ - /* check when creating the GC. */ - XGCValues values; /* initial values for the GC. */ - unsigned int line_width = 2; /* line width for the GC. */ - int line_style = LineSolid; /* style for lines drawing and */ - int cap_style = CapButt; /* style of the line's edje and */ - int join_style = JoinBevel; /* joined lines. */ - int screen_num = DefaultScreen(display); - - gc = XCreateGC(display, win, valuemask, &values); - if (gc < 0) { - fprintf(stderr, "XCreateGC: \n"); - } - - /* allocate foreground and background colors for this GC. */ - if (reverse_video) { - XSetForeground(display, gc, WhitePixel(display, screen_num)); - XSetBackground(display, gc, BlackPixel(display, screen_num)); - } - else { - XSetForeground(display, gc, BlackPixel(display, screen_num)); - XSetBackground(display, gc, WhitePixel(display, screen_num)); - } - - /* define the style of lines that will be drawn using this GC. */ - XSetLineAttributes(display, gc, - line_width, line_style, cap_style, join_style); - - /* define the fill style for the GC. to be 'solid filling'. */ - XSetFillStyle(display, gc, FillSolid); - - return gc; -} - -void -main(int argc, char* argv[]) -{ - Display* display; /* pointer to X Display structure. */ - int screen_num; /* number of screen to place the window on. */ - Window win; /* pointer to the newly created window. */ - unsigned int display_width, - display_height; /* height and width of the X display. */ - unsigned int win_width, - win_height; /* height and width for the new window. */ - char *display_name = getenv("DISPLAY"); /* address of the X display. */ - GC gc; /* GC (graphics context) used for drawing */ - /* in our window. */ - XFontStruct* font_info; /* Font structure, used for drawing text. */ - char* font_name = "*-helvetica-*-12-*"; /* font to use for drawing text. */ - - /* open connection with the X server. */ - display = XOpenDisplay(display_name); - if (display == NULL) { - fprintf(stderr, "%s: cannot connect to X server '%s'\n", - argv[0], display_name); - exit(1); - } - - /* get the geometry of the default screen for our display. */ - screen_num = DefaultScreen(display); - display_width = DisplayWidth(display, screen_num); - display_height = DisplayHeight(display, screen_num); - - /* make the new window occupy 1/9 of the screen's size. */ - win_width = (display_width / 3); - win_height = (display_height / 3); - printf("window width - '%d'; height - '%d'\n", win_width, win_height); - - /* create a simple window, as a direct child of the screen's */ - /* root window. Use the screen's white color as the background */ - /* color of the window. Place the new window's top-left corner */ - /* at the given 'x,y' coordinates. */ - win = create_simple_window(display, win_width, win_height, 0, 0); - - /* allocate a new GC (graphics context) for drawing in the window. */ - gc = create_gc(display, win, 0); - XSync(display, False); - - /* try to load the given font. */ - font_info = XLoadQueryFont(display, font_name); - if (!font_info) { - fprintf(stderr, "XLoadQueryFont: failed loading font '%s'\n", font_name); - exit(-1); - } - - /* assign the given font to our GC. */ - XSetFont(display, gc, font_info->fid); - - { - /* variables used for drawing the text strings. */ - int x, y; - char* text_string; - int string_width; - int font_height; - - /* find the height of the characters drawn using this font. */ - font_height = font_info->ascent + font_info->descent; - - /* draw a "hello world" string on the top-left side of our window. */ - text_string = "hello world"; - x = 0; - y = font_height; - XDrawString(display, win, gc, x, y, text_string, strlen(text_string)); - - /* draw a "middle of the road" string in the middle of our window. */ - text_string = "middle of the road"; - /* find the width, in pixels, of the text that will be drawn using */ - /* the given font. */ - string_width = XTextWidth(font_info, text_string, strlen(text_string)); - x = (win_width - string_width) / 2; - y = (win_height + font_height) / 2; - XDrawString(display, win, gc, x, y, text_string, strlen(text_string)); - } - - /* flush all pending requests to the X server. */ - XFlush(display); - - /* make a delay for a short period. */ - sleep(4); - - /* close the connection to the X server. */ - XCloseDisplay(display); -} |