DRAW AND FILL (XIO) COMMANDSFrom: visitor
Date: 08/15/89-08:57:37 AM Z
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From: visitor Subject: DRAW AND FILL (XIO) COMMANDS Date: Tue Aug 15 08:57:37 1989 I have heard and seen it in the books about an XIO command 18. It's supposed to fill in a graphic with color. How can I do this? Please explain. Thank you for any information. ** Answered by DOUG WOKOUN (aa384) on Mon Jul 31 04:01:23 1989 ** The DRAW or FILL command is simply a command to fill in all points from the one selected to the right to the next plotted point. To make this clearer. + + + A B C if you did an XIO 18 at point A, you would get this: +++++++++++++++++++ + A B C In my experience, I have not had much use for this command. It will not fill a closed object like the fill commands in a paint program. The disadvantage to this command is that you must load the values for the coordinates into memory before calling it. loc.90 is the row coordinate and 91,92 is the LSB/MSB for the column. You must also set loc.695 to a non-zero number to enable the fill. The other drawing commands can be executed from XIO also. This acts like a call to a library of OS routines including commands to various devices when needed. Thanks for asking. |Doug Wokoun|aa384|Atari SigOp|
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