# VectorPaint repeating patterns: check a tile’s four edges by hand
Language: en
Canonical: [VectorPaint repeating patterns: check a tile’s four edges by hand]()
中文：[中文 HTML]()
English: [English HTML]()
Published: 2026-10-23T00:00:00+08:00
Modified: 2026-10-23T10:44:58+08:00
Author: Bison
Start from a square tile, manually duplicate leaves and dots, check opposite-edge correspondence and use a nine-tile preview to spot seams.
English translation of the [Chinese original](), translated on 2026-10-23. The article body uses automated translation; app descriptions, historical reading notes and video subtitles receive separate editorial checks. Original publication dates, attribution, code and version notes are retained.
The challenge in a repeating pattern is often not drawing one motif but joining neighboring tiles without seams. This VectorPaint exercise manually builds a square tile of leaves and dots, using corresponding positions and a nine-tile preview to inspect boundaries without an automatic seamless-pattern generator.
## Establish a clearly defined square tile
Create a 400×400 px square canvas with a light background, one dark-green leaf, and a small dot as base elements. Draw the leaf in the center and finish its silhouette and color before duplicating. Once tile dimensions are fixed, every cross-boundary relationship uses them as its reference.
Use a grid to help layout, initially keeping central elements away from edges. Do not press every motif against all four sides on the first attempt. Make a simple arrangement without crossing objects, inspect repeated density, then add boundary connections gradually. This separates motif problems from seam-position problems.
## Plan the center and spacing rhythm first
Place a leaf slightly left of center, a dot at the upper right, and a smaller copied leaf below. Their density differences prevent a rigid grid of motifs. Keep the object count small and check that each remains recognizable when reduced.
Look for an unusually large empty hole or two overly close leaves. Empty space repeats too: an inconspicuous gap in one tile can become a regular bright stripe across a pattern. A few shapes reveal this principle without dozens of decorative objects.
## Handle left and right boundaries with paired copies
If a leaf crosses the left edge, the right edge needs the corresponding remainder of that same leaf. Retain it, duplicate it, and move the copy right by exactly one tile width—four hundred canvas units here. Keep size, angle, and vertical position identical.
Use object geometry to record coordinates before and after movement. With numeric input, confirm a consistent coordinate reference and unit before applying changes. If input is awkward, establish matching grid references and refine through tiled previews. Redrawing the two edge leaves separately by eye makes exact contour matching difficult.
## Apply the same relationships to top and bottom
An object crossing the top needs a counterpart below, translated by one tile height. An object crossing the upper-left corner needs corresponding upper-right, lower-left, and lower-right copies. Corners are easy places to miss one, leaving a gap visible only where four tiles meet.
Record these copies as a related set before changing shapes further. If one leaf tip or angle changes, update its corresponding objects too. Finishing the central motif before making boundary copies reduces later tracking. Practice complex designs in a copy instead of changing the base silhouette after the whole area is tiled.
## Export the tile and assemble a nine-tile preview
Export a four-hundred-pixel square PNG, create a larger preview canvas, import it, and duplicate it into three rows and three columns. Keep identical dimensions and join edges exactly, without overlapping to conceal seams. Image copies are sufficient because the preview tests repetition relationships.
Inspect the central four-tile junction and horizontal and vertical seams. Broken leaves usually indicate positions or missing counterparts; thick color bands may indicate overlapping duplicates; an overly empty column may come from the tile's spacing. Record issues, revise the original, and export again for comparison.
## Distinguish real seams from sampling lines
Some zoom levels show very thin preview lines between images. Inspect actual pixel size and another zoom level to see whether the line changes with sampling. If it persists and the original tile really has blank edge pixels, correct the original.
Check that the background covers the whole tile and output dimensions match the plan. When tiling four-hundred-pixel images, each must remain four hundred pixels, not one at four hundred and another at three hundred ninety-nine. Do not mistake an entire preview with extra margins for the final tile. Keep export bounds explicit.
## Questions and final checks
**Is matching left and right enough to make it seamless?** Also inspect top, bottom, and four-corner junctions, plus any obvious bands across a larger repeat. Geometric continuity and natural visual rhythm are separate results to assess.
**Can the whole nine-tile preview become a tile?** It can become a larger repeat asset, but increases file size and may carry preview errors with it. Retain the smallest base tile and choose output bounds according to the actual use for easier continued editing.
Save three kinds of files: the editable base original, the tile image for repetition, and the nine-tile display preview. Name each by purpose. For fabric or packaging print, separately confirm physical size, resolution, and color requirements with the recipient. Screen seam checks cover only part of pattern continuity.
## Isolate a seam error with one edge object
If the left leaf tip fails to connect, temporarily hide other edge elements and retain only that pair. Export again and join two tiles to distinguish vertical misalignment, contour mismatch, and insufficient translation. Restore other objects after fixing the pair and inspect them one at a time. Complex patterns distract when every seam is visible; a reliable single-object correspondence provides a method for the rest.
## Related tutorials and sources
[Grid and references](), [Grouping and stacking]().
Based on [VectorPaint App Store description]() and the available feature entry points; [Apple release information]()Checked on October 23, 2026: public version 1.0.7, requiring iOS / iPadOS 17 or later. The dimensions, wording and shapes in this guide are suggested exercises.