/************************************************************************/
/* Draw sixteen boxes using pixel write                                 */
/************************************************************************/

pixel_box16()
        {
        #define MONO            5
        #define VMONO           7
        #define COLOR           4
        #define ENHANCED        3
        #define VCOLOR          8
        int     box, i, j, color, x, y;
        int     type;

        /* Get display type and select mode accordingly                 */

        type = get_display_type();              /* Get display type     */
        switch (type)                           /* Set mode according to*/
                {                               /* type of display      */
                case VMONO:
                case MONO:
                        set_mode(0x0F);
                        break;
                case COLOR:
                        set_mode(0x0E);
                        break;
                case VCOLOR:
                case ENHANCED:
                default:
                        set_mode(0x10);
                        break;
                }

        /* Draw boxes using SET/RESET write mode                        */

        printf("Drawing pixels using mode 0, SET/RESET method");
        for (box = 0; box < 16; box++)          /* Loop over boxes      */
            for (j = 0; j < 10; j++)            /* Loop over rasters    */
                                                /* within box           */
                for (i = 0; i < 100; i++)       /* Loop over pixels     */
                        {                       /* within raster        */
                        x = i;                  /* Set x                */
                        y = j + 10 * box;       /* Compute y            */
                        color = box;            /* Set color            */
                        pixel_set(x, y, color); /* Fill next pixel      */
                        }
        getchar();                              /* Wait for <Enter>     */

        /* Draw boxes using PACKED write mode                           */

        cls();
        printf("Drawing pixels using mode 2, packed write method");
        for (box = 0; box < 16; box++)          /* Loop over boxes      */
            for (j = 0; j < 10; j++)            /* Loop over rasters    */
                                                /* within box           */
                for (i = 0; i < 100; i++)       /* Loop over pixels     */
                        {                       /* within raster        */
                        x = i;                  /* Set x                */
                        y = j + 10 * box;       /* Compute y            */
                        color = 15 - box;       /* Set color            */
                        pixel_packed_write(x, y, color);/*Fill next pix */
                        }
        getchar();                              /* Wait for <Enter>     */

        /* Draw boxes using PLANAR write mode                           */

        cls();
        printf("Drawing pixels using mode 0, planar write method");
        for (box = 0; box < 16; box++)          /* Loop over boxes      */
            for (j = 0; j < 10; j++)            /* Loop over rasters    */
                                                /* within box           */
                for (i = 0; i < 100; i++)       /* Loop over pixels     */
                        {                       /* within raster        */
                        x = i;                  /* Set x                */
                        y = j + 10 * box;       /* Compute y            */
                        color = box;            /* Set color            */
                        pixel_write(x, y, color);/*Fill next pixel      */
                        }
        }