I figured out a way to do these points with a continuous strand of fiber. I'm using Briggs & Little country roving (which can be found on my website and by clicking on "country roving"). I'm using 6 strands of the fiber instead of the 5 that it comes with because it fits the holes best that way. This canvas is 3.3 holes to the inch.
I'm showing the back to show how I keep the roving going continuously.
The way I do it is to work the shape back and forth and the straight edge is the last loop in each shape... when I get to the top of the shape, I work back to the bottom of the section, keeping the loops oriented correctly and then do another shape...
I could also do each shape individulally without the single column at the straight edge and cut the yarn, but that would be a lot of weaving in (which could be done as you go OR a bunch at a time. Working line by line would probably give a similar effect of the piece I'll show below...but then I would have to have several pieces of roving in progress for each point... which might not be so bad!
This morning, I pulled out a "swatch" that I did several years ago using carded batts turned into thick and thin roving... I did a larger piece that was probably lost in our house fire in 2009... this piece was in our storage space:
It isn't finshed, probably 2 or 3 rows to go... the canvas is distorted and somewhat compressed...the fiber is probably too thick for it to lay flat, though blocking it may help... here is a closeup and you can see that the canvas holes are no longer properly square:
I don't remember the details about the fiber. I may have dyed some of it, but I don't think so...