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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: -
 

Mode Settings

The settings for the Mode number are: -
 
vbBlackness 1 Blackness.
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.
vbWhiteness 16 Whiteness.

Remarks

Use this property to produce visual effects when you have turned on the "Shortest Path" (negative significance value) by checking the "Sig  control. Also Use this property to produce visual effects when you are displaying positional lines that are drawn from repositioned layers.

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.