SETFILLMASK (W*S)

Module

USE IFQWIN

CALL SETFILLMASK (mask)

There are 8 bytes in mask, and each of the 8 bits in each byte represents a pixel, creating an 8x8 pattern. The first element (byte) of mask becomes the top 8 bits of the pattern, and the eighth element (byte) of mask becomes the bottom 8 bits.

During a fill operation, pixels with a bit value of 1 are set to the current graphics color, while pixels with a bit value of zero are set to the current background color. The current graphics color is set with SETCOLORRGB or SETCOLOR. The 8-byte mask is replicated over the entire fill area. If no fill mask is set (with SETFILLMASK), or if the mask is all ones, solid current color is used in fill operations.

The fill mask controls the fill pattern for graphics routines (FLOODFILLRGB, PIE, ELLIPSE, POLYGON, and RECTANGLE).

To change the current fill mask, determine the array of bytes that corresponds to the desired bit pattern and set the pattern with SETFILLMASK, as in the following example.

Example

This program draws six rectangles, each with a different fill mask, as shown below.

 ! Build as QuickWin or Standard Graphics Ap.
 USE IFQWIN

 INTEGER(1), TARGET :: style1(8) &
             /Z'18',Z'18',Z'18',Z'18',Z'18',Z'18',Z'18',Z'18'/
 INTEGER(1), TARGET :: style2(8) &
             /Z'08',Z'08',Z'08',Z'08',Z'08',Z'08',Z'08',Z'08'/
 INTEGER(1), TARGET :: style3(8) &
             /Z'18',Z'00',Z'18',Z'18',Z'18',Z'00',Z'18',Z'18'/
 INTEGER(1), TARGET :: style4(8) &
             /Z'00',Z'08',Z'00',Z'08',Z'08',Z'08',Z'08',Z'08'/
 INTEGER(1), TARGET :: style5(8) &
             /Z'18',Z'18',Z'00',Z'18',Z'18',Z'00',Z'18',Z'18'/
 INTEGER(1), TARGET :: style6(8) &
             /Z'08',Z'00',Z'08',Z'00',Z'08',Z'00',Z'08',Z'00'/
 INTEGER(1) oldstyle(8) ! Placeholder for old style
 INTEGER loop
 INTEGER(1), POINTER :: ptr(:)

 CALL GETFILLMASK( oldstyle )
 ! Make 6 rectangles, each with a different fill
 DO loop = 1, 6
   SELECT CASE (loop)
     CASE (1)
       ptr => style1
     CASE (2)
       ptr => style2
     CASE (3)
       ptr => style3
     CASE (4)
       ptr => style4
     CASE (5)
       ptr => style5
     CASE (6)
       ptr => style6
   END SELECT
   CALL SETFILLMASK( ptr)
   status = RECTANGLE($GFILLINTERIOR,INT2(loop*40+5), &
                INT2(90),INT2((loop+1)*40), INT2(110))
 END DO

 CALL SETFILLMASK( oldstyle )  ! Restore old style
 READ (*,*)                    ! Wait for ENTER to be
                               ! pressed
 END

The following shows the output of this program.