Two other Options to get the filled donut that I believe uses fewer steps and is quicker
Option A: WildTools Thicken Tool
With the two circles drawn (donut edge and hole):
1.
Option+Click on WTools
Thicken Tool and set to INTERACTIVE
2. Drag from Outer donut circle toward donut hole
3. Press "
S" for surface snap and the donut (sans hole) is filled with a new polygon
Option B: PowerCADD Paint Bucket Tool
With the two circles drawn (donut edge and hole):
1. Select the
Paint Bucket tool
2. Click inside, between the donut and the hole
3. The donut is filled
Render "to taste" as described in original post
No need to draw any extra objects nor reshape the polygon to close it up.
Personally, I find the WT Thicken tool creates a cleaner polygon with fewer vertices but both methods work. In particular, the Polygon created with WT Thicken has fewer crossing segments which is helpful when applying things like gradients. I often find it useful to use
Tool menu > Polygon... > Thin Polygon (or
Distribute points then
Thin depending on the complexity of the shape) as it helps reduce the # of vertices and can eliminate problems if exporting to PDF, particularly if reducing drawings. PDF historically doesn't like vertices that cross over each other and when creating the Bézier curves in some cases things get a little messed up
Always nice to have more than one way to skin a cat!
Pity that PCADD lost the ability to do that same operation with Hatching. In earlier versions, it was possible to just select the two objects (donut and hole) and choose HATCH... it would hatch the donut, leaving the hole.