Support Forum

Integer-width paths end up with coordinates off-grid

User
20190913
Wednesday 12th June 2019
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Path_Off_Grid.png

I draw a path with default width = 10.000um that has 45-degree segments (per the Utilities>Setup>Shapes constraint) and the outer edge vertices end up off-grid. I cannot find a "snap to grid" utility to fix this (if I convert to polygon, the vertices are likewise off grid) and I cannot find a path drawing constraint that would force path edges (rather than path centerline) to adhere to the set snap-grid (0.5um). Any suggestions how I can make routes stick to grid? Other than straight Manhattan (not going to fly)? I just know I'm going to get dinged for off-grid shapes come layout verification time. Thinking I may just need to build a "stick library" of straight and properly-snapped 45 segments and forget about using paths?
J├╝rgen
LayoutEditorFull
Wednesday 12th June 2019
You're asking for something impossible. A 45deg path with the center line on grid will never have the outline on the grid for most of the width values. Once the path is converted to a polygon you can use the 'round elements' feature to move the edges to the nearest grid point.
User
20190913
Thursday 13th June 2019
Right you are, except that "centerline justified" is a choice (no others available it appears, but a choice that I have seen elsewhere for default path drawing option). "Edge justified".