Creating a Custom Fill Pattern

To create a custom fill pattern that the operating system will use to fill area primitives and paths:

• Set an array of bits for a bit map that measures 8-bits-by-8-bits (remember that the operating system pads the bit-map bits on a ULONG (32-bit) boundary).

• Create a bit map in a screen presentation space by calling GpiCreateBitmap and passing it the address of the array of bits from Step 1.

• Assign a local identifier (lcid) to the bit map by calling GpiSetBitmapId.

• Set the attribute of the pattern set in the AREABUNDLE structure by calling GpiSetPattern.

The following figure shows how to create the pattern.

    /* Define an array of bytes;  this array creates a grid pattern. */
    BYTE abPattern5[] = {
        0xFF, 0xFF, 0x00, 0x00,
        0x80, 0x00, 0x00, 0x00,
        0x80, 0x00, 0x00, 0x00,
        0x80, 0x00, 0x00, 0x00,
        0x80, 0x00, 0x00, 0x00,
        0x80, 0x00, 0x00, 0x00,
        0x80, 0x00, 0x00, 0x00,
        0x80, 0x00, 0x00, 0x00,
        0x80, 0x00, 0x00, 0x00,
        0x80, 0x00, 0x00, 0x00,
        0x80, 0x00, 0x00, 0x00,
        0x80, 0x00, 0x00, 0x00,
        0x80, 0x00, 0x00, 0x00,
        0x80, 0x00, 0x00, 0x00,
        0x80, 0x00, 0x00, 0x00,
        0x80, 0x00, 0x00, 0x00 };

        LONG lcidCustom = 1;
    HPS hps;
    PBITMAPINFO2 pbmi;
    BITMAPINFOHEADER2 bmp;
    HBITMAP hbm;
    PRGB2 prgb2;

    /* Create the bit map, passing the address of the array of bytes. */
    hbm = GpiCreateBitmap(hps, &bmp, CBM_INIT, (PBYTE) abPattern5, pbmi);

    /* Assign a local identifier to the bit map.                      */
    GpiSetBitmapId(hps, hbm, lcidCustom);

    /* Set the pattern-set attribute in the AREABUNDLE structure.     */
    GpiSetPatternSet(hps, lcidCustom);