XLIB Programming Manual, Rel. 5, Third Edition

14.10 Drawing a Pad

This routine simply sets colors and draws the text in a pad. Example 14-13 shows the drawButton routine.

Example 14-13. basecalc — the drawButton routine

/* Draw a single pad with its text */
drawButton (win, exposeEvent)
register int win;
{
    register char *string;
    register int x, y;
    struct windata *winp;
    char *Measure;
    XSetWindowAttributes attributes;
    unsigned long valuemask;
    GC gc;

    winp = &windata[win];
    x = winp->x;
    y = winp->y;
    string = winp->text;

    switch (windata[win].color) {
    case WHITE:
        gc = fgGC;
        attributes.background_pixel = background;
        attributes.border_pixel = foreground;
        valuemask = CWBackPixel|CWBorderPixel;
        break;
    case BLACK:
        gc = bgGC;
        attributes.background_pixel = foreground;
        attributes.border_pixel = background;
        valuemask = CWBackPixel|CWBorderPixel;
        break;
    case LIGHTGRAY:
        gc = bgGC;
        attributes.background_pixmap = lgrayPixmap;
        attributes.border_pixel = foreground;
        valuemask = CWBackPixmap|CWBorderPixel;
        break;
    }
    if (!exposeEvent){
        XChangeWindowAttributes(display, Buttons[win].self,
                valuemask, &attributes);
        XClearWindow(display, Buttons[win].self);
    }
    XDrawString (display, Buttons[win].self, gc, x, y, string,
            strlen (string));
    if (win == 0) {
        switch (Base) {
            case 10:
            case 8:
                Measure = Octmeasure;
                break;
            default:
            case 16:
            case  2:
                Measure = Hexmeasure;
            break;
        }
        XDrawString (display, dispWin, gc, 7, 6, Measure, 31);
    }
}