Visual Basic, Using Xor pen to get a certain color

Using Xor pen to get a certain color

Author	Message
Phil Ner #1 / 2	Using Xor pen to get a certain color Hey graphics experts, I want to draw a RED (&HFF) line on a Picture Box (pic), using an Xor pen. I set the BackColor of the Picture Box to &HFFFFFF (WHITE) I set the DrawMode to 7 (XOR_PEN) I set pic.ForeColor to &HFFFF00 (WHITE Xor RED) I draw a line, expecting it to come out &HFFFFFF Xor &HFFFF00, or &HFF, but it doesn't look &HFF. It just isn't as bright as my other reds. What am I doing wrong? Am I wrong to assume that the Xor pen draws a color equivalent to pic.BackColor Xor pic.ForeColor? Thanks :) -- Phil Nery Dataform WWW: http://www.--*.com/ voice: 310-374-1378
Fri, 13 Nov 1998 03:00:00 GMT

John Bod #2 / 2	Using Xor pen to get a certain color Quote: >I want to draw a RED (&HFF) line on a Picture Box (pic), using an Xor >pen. >I set the BackColor of the Picture Box to &HFFFFFF (WHITE) >I set the DrawMode to 7 (XOR_PEN) >I set pic.ForeColor to &HFFFF00 (WHITE Xor RED) >I draw a line, expecting it to come out &HFFFFFF Xor &HFFFF00, or &HFF, >but it doesn't look &HFF. It just isn't as bright as my other reds. >Am I wrong to assume that the Xor pen draws a color equivalent to >pic.BackColor Xor pic.ForeColor? In 24-bit colour, this works the way you would expect (white Xor cyan = red). In 256-colour mode, it's the palette indices (not the RGB values) that are Xor'd, so the result is dependent on how the palette is organized. ----- J. Bodie
Fri, 13 Nov 1998 03:00:00 GMT

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