Mode mode.htm - Sets the Mode option for
how the Shortest Path and positional lines are combined on the display.
The Mode settings are as follows: -
|vbNotMergePen||2||Not Merge Pen — Inverse of setting 15 (Merge Pen).|
|vbMaskNotPen||3||Mask Not Pen — Combination of the colors common to the background color and the inverse of the pen.|
|vbNotCopyPen||4||Not Copy Pen — Inverse of setting 13 (Copy Pen).|
|vbMaskPenNot||5||Mask Pen Not — Combination of the colors common to both the pen and the inverse of the display.|
|vbInvert||6||Invert — Inverse of the display color.|
|vbXorPen||7||Xor Pen — Combination of the colors in the pen and in the display color, but not in both.|
|vbNotMaskPen||8||Not Mask Pen — Inverse of setting 9 (Mask Pen).|
|vbMaskPen||9||Mask Pen — Combination of the colors common to both the pen and the display.|
|vbNotXorPen||10||Not Xor Pen — Inverse of setting 7 (Xor Pen).|
|vbNop||11||Nop — No operation — output remains unchanged. In effect, this setting turns drawing off.|
|vbMergeNotPen||12||Merge Not Pen — Combination of the display color and the inverse of the pen color.|
|vbCopyPen||13||Copy Pen (Default) — Color specified by the ForeColor property.|
|vbMergePenNot||14||Merge Pen Not — Combination of the pen color and the inverse of the display color.|
|vbMergePen||15||Merge Pen — Combination of the pen color and the display color.|
Visual Basic compares each pixel in the draw pattern to the corresponding pixel in the existing background and then applies bit-wise operations. For example, setting 7 (Xor Pen) uses the Xor operator to combine a draw pattern pixel with a background pixel.
The exact effect of a DrawMode setting depends on the way the color
of a line drawn at run time combines with colors already on the screen.
Settings 1, 6, 7, 11, 13, and 16 yield the most predictable results. However,
some of the best artwork that you can make from spinning grids is done
using the more unpredictable settings.