🌻 Draw Simple Rectangle

Draws a rounded rectangle on a blank canvas and hands you both the image and a matching mask. The mask is why this is more than a toy - a clean rectangular mask is exactly what you need to seed an inpaint region, block out a composite area, or build a simple frame, and generating one by hand is more annoying than it sounds.

What you'd do with it

Masking, mostly. Say you want to inpaint a specific rectangular chunk of an image, or composite something into a defined box. You need a mask of that region. This node makes one at whatever position and size you specify, with anti-aliased edges so the boundary isn't jagged. You can also use the image output directly as a solid color block - a background plate, a color swatch, a placeholder.

The inputs worth knowing

There are a lot of them, but they group cleanly:

• width / height - the canvas size.
• left / top / right / bottom - these define the rectangle by its inset from each edge of the canvas, not as x/y/width/height. So left: 50 means the rectangle starts 50px in from the left. It's a slightly different mental model than you might expect, so glance at the preview the first time.
• radius - corner rounding. Set 0 for hard corners, higher for a pill shape.
• fill_red / fill_green / fill_blue - the color, 0–255 each.
• fill_alpha - opacity, 0 to 1.
• SSAA - supersampling, 1–16. The node draws at a larger size then shrinks down, which is what gives you smooth edges instead of aliased ones. 4 is a fine default; crank it for very smooth curves at the cost of a little speed.
• method - the resampling filter used for that downsample (lanczos, bicubic, etc.). Lanczos is the clean pick.

Outputs are the IMAGE (the drawn rectangle) and the MASK (the same shape as a mask). The mask is the one you'll wire into an inpaint or composite node.

Practical notes

The inset-from-each-edge layout is the only real head-scratcher - if your rectangle isn't where you expect, that's almost always why. SSAA at 4 with lanczos gives you nicely smooth rounded corners; there's rarely a reason to go past 8. And since it starts from a blank canvas, this makes shapes and masks, not edits to an existing image - for that you'd composite the output onto your picture in a later node.

Installing ComfyUI-Addoor

ComfyUI Manager: Install Custom Nodes → search "ComfyUI-Addoor" → install → restart. Manual:

cd ComfyUI/custom_nodes
git clone https://github.com/Eagle-CN/ComfyUI-Addoor.git
cd ComfyUI-Addoor
pip install -r requirements.txt

Restart and find it under 🌻 Addoor / Utilities. Preview the output once to get the feel for the inset-based positioning before you build around it.