# VectorPaint action speed lines: coordinate direction, density and subject space

Language: en
Canonical: [VectorPaint action speed lines: coordinate direction, density and subject space](<https://allluckly.cn/en/guides/vectorpaint-action-speed-lines/>)
中文：[中文 HTML](<https://allluckly.cn/guides/vectorpaint-action-speed-lines/>)
English: [English HTML](<https://allluckly.cn/en/guides/vectorpaint-action-speed-lines/>)
Published: 2026-11-03T00:00:00+08:00
Modified: 2026-11-03T09:34:11+08:00
Author: Bison

Add manual speed lines to an original skateboard scene, checking motion, convergence, clear faces and noise after reduction.

English translation of the [Chinese original](<https://allluckly.cn/guides/vectorpaint-action-speed-lines/>), translated on 2026-11-03. Original publication dates, attribution, code and version notes are retained.

Speed lines should do more than fill the canvas with diagonals. Use an original skateboard and simplified figure to compare parallel motion lines with converging focus lines and observe how each affects reading of the action. They are static illustration choices, not simulated physical speed, animation or motion detection.

## Define the action and clear space in one sentence

Use a 1200 by 800 pixel landscape canvas with the figure moving right, clear space ahead and room for lines behind. Establish the board, pose and ground so the action reads without effects. No physical speed measurement is needed. Protect face, hands and wheels as recognition areas. Save a clean baseline before adding lines so later comparisons distinguish stronger motion from simply increased visual clutter.

## Start parallel lines with restrained length variation

Draw a small set of unfilled, nearly horizontal paths behind the subject. Establish direction first, then two or three lengths and controlled density. Avoid equal-length grid-like repetition or conflicting slopes. Vary weight sparingly so no effect line dominates the figure outline. Begin with six to eight separately selectable paths and preserve access to individual lines rather than grouping them into an unmanageable unit too early.

## Test converging lines in a separate copy

Return to a copy of the clean baseline and establish a temporary focus near the action. Build a few outer directions before additional rays, keeping endpoints away from faces. Convergence emphasises attention or impact rather than necessarily showing literal travel, so distinguish it from trailing parallel lines. Move an ineffective focus before increasing line count. Remove ordinary focus markers from the final export.

## Protect the subject from effect lines

Inspect every line against eyes, hands and wheels. Shorten or move paths rather than accumulating white cover patches that fail on a new background. If using a mask, keep its scope and stacking separate from the figure. Avoid fragile sliver gaps. Temporarily recolour effect lines for inspection, then restore the intended palette; diagnostic contrast need not become the final style.

## Use density rather than global heaviness

Increase density selectively near the intended emphasis and reduce it toward quieter edges. Uniform density can become grey noise after reduction. Compare light and dark line versions with geometry held fixed before changing spacing. Avoid altering weight, focus and character position simultaneously. Judge whether the lines support the action and figure, not how many objects the document contains.

## Compare the clean scene with both treatments

Compare equal-size previews of the clean scene, parallel lines and convergence. Identify travel direction and initial attention in each. A focus treatment may suit surprise or emphasis better than this motion; choose the useful structure instead of combining every effect. Reduce the selected version to its intended size and check detail loss. Record concrete results such as readable hands and a subordinate background rather than relying solely on an impression of impact.

## Organise effect versions and verify output

Retain editable figures/effects and a separate clean version. Inspect fine lines, endpoints and frame edges after export, excluding test colours and focus markers. Check destination backgrounds before selecting light or dark treatments. Name treatment and size explicitly. A moved figure requires renewed protection-area and focus checks because effect lines do not track the subject automatically. Reopen the exact delivery file before sharing.

## Reduce lines and recheck direction when cluttered

Hide half the lines to assess clutter, then restore only useful ones. Diagnose reversed motion through direction and leading space, not labels alone. Shorten rays near a dark focus and reduce overlaps without altering figure opacity. Strengthen only necessary lines that break in output. Compare against the clean baseline again and retain effects only when subject, motion and emphasis become clearer.

## Related tutorials and sources

[VectorPaint pen tutorial: draw a leaf with a few anchors](<https://allluckly.cn/en/guides/vectorpaint-pen-curves/>), [VectorPaint layers and groups: make complex work easier to select and edit](<https://allluckly.cn/en/guides/vectorpaint-layers-groups/>).

Sources checked on November 3, 2026: VectorPaint 1.0.8, requiring iOS / iPadOS 17 or later. Capability scope follows the [official App Store description](<https://apps.apple.com/cn/app/id1587272880>) and [Apple public version lookup](<https://itunes.apple.com/lookup?id=1587272880&country=cn>). These are exercises and checks you can perform, without a claim of step-by-step physical-device testing or verification in every target environment. Example content is instructional; follow the controls in your installed version.