RectangleContour

RectangleContour is the square-cornered member of the WPX sticker-arrangement family. Where AnimalContour traces an organic outline and CircleContour builds concentric rings, this one detects a rectangle in your input image and fills it with a tidy grid of stickers - nested rectangles inside rectangles, like a matryoshka sticker sheet. It's the node you reach for when you want order, not scatter: product sticker packs, card backgrounds, and anything where the composition should read as deliberate rows rather than random tiling. Same pack (ComfyUI WPX Nodes), same story: no model, no key, pure CPU.

How it works

The node binarizes your rectangle_image, finds the largest contour, and takes its bounding box as the rectangle. It then generates n_scales concentric rectangles that shrink toward the center, keeping themselves centered. Inside each rectangle it lays a regular grid - the grid cell size is sticker_size × cell_size_factor - and drops a sticker at every grid point with a small random offset and a slight rotation. The one genuinely clever bit: stickers sitting on the rectangle's edges are aligned flush to the boundary and un-rotated, so the outer border reads as a clean frame instead of a jagged mess. After the nested layers, the main_sticker is pasted dead-center, scaled by main_sticker_size.

The inputs that matter

• rectangle_image - the shape that defines the box. Any rectangle-ish silhouette whose largest contour is the rectangle you mean.
• stickers - the fill pool. A batch of sticker images the node cycles through.
• main_sticker - the centerpiece.
• n_scales (4) - how many nested rectangle layers.
• sticker_size (280) and cell_size_factor (0.45) - sticker long side and how much of a grid cell a sticker fills. Factor too high and stickers overlap heavily; too low and the grid gets gappy.
• main_sticker_size (450) - centerpiece scale.
• crop_image (bool) + padding - trims transparent margins off sticker PNGs before arranging.

Output: a single image (RGBA), wire it to a preview or save node.

Installing

ComfyUI Manager → search "ComfyUI WPX Nodes" → install → restart. Manual:

cd ComfyUI/custom_nodes
git clone https://github.com/WangPengxing/ComfyUI_WPX_Node
# restart ComfyUI

No weights, no requirements file. The recurring pack gotcha: rtree and scipy are imported at startup, and if either is missing the entire WPX_Node menu disappears. pip install rtree scipy and restart.

Troubleshooting

• The grid isn't filling the whole rectangle. cell_size_factor is low, so cells are smaller than the rectangle wants to be filled. Raise it toward 0.5–0.6.
• Stickers spill past the edge. The outer layer aligns flush to the boundary, but a very wide sticker can still peek out. Shrink sticker_size relative to your rectangle.
• [DEBUG] spam in the console - normal for this pack; the author left debug prints in every node.

Same caveats as the rest of the pack: 0.0.1, one early-2025 update, zero community footprint. It's a niche utility with a narrow job, but for "fill this box with a neat grid of stickers" there's nothing in the mainstream ecosystem that does it more directly.