Wipeout or Image Clip using a Circle
If you ever need to mask part of an image using a circle, you might know that neither WIPEOUT or IMAGECLIP support the selection of a circle. One way to work around this is to use the POLYGON command to draw your "circle" - just use a high number of sides, maybe 200.
After you create the multi-sided polygon, just use the WIPEOUT or IMAGECLIP command. If you use IMAGECLIP, make sure the Invert option is set correctly.
See below for examples. The top image is a inverted image clip created from a 200-sided polygon, which approximates a circle very well. The bottom image contains another 200-sided polygon with a wipeout applied, and a closed spline converted to a polyline, to which an inverted image clip has been applied.
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Comments
nice tricky idea...BUT we can
on Sat, 05/07/2011 - 09:26 Permalink
nice tricky idea...BUT we can use a direct CAD command called CLIPIT ..try it.
Regards,
True, but CLIPIT is part of
on Mon, 05/09/2011 - 08:28 Permalink
True, but CLIPIT is part of Express Tools (not available for AutoCAD LT), and it performs the invert of what is shown above - meaning that it trims what is outside of the entity.
Just an FYI: CLIPIT actually uses a multi-sided polygon also.