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I would like to fill a fairly complex polygon with a point pattern fill, but the border of the polygon "cuts" the circles and the result does not look as clean as I would like.
I know it is this is how it should be, but is there a way to use only full circles/points/dots? For example, showing a black dot only if its centre is contained within the polygon (and even if part of it is outside the polygon).
You could try this approach, but with the following caveats:-
You could make a vector grid (of polygon type) with an appropriate size (say, 100m x 100m spacing) depending on the symbol spacing you want and the scale you want to print at. You could also consider using MMQGIS Plugin > Create Grid which also allows hexagonal grids... this will allow an 'offset' look where every other row of dots is shifted slightly.
Next, do a spatial join (join attributes by location) with the original polygon - the one you wish to fill - so that you only keep those squares which intersect your original polygon. That should give you a grid of square cells which slightly overlaps your original area.
Now, render this grid as 'centroid fill'. Centroid markers should all show completely, although it's possible some centroids will be OUTSIDE of your fill polygon. But it should fix the problem you have here with small interior holes clipping your symbols.
An alternative is to use a finer point spacing on your pattern fill, and smaller symbols.
