scratch-multi-sprite-drawing

Coordinate pen drawing across multiple Scratch sprites via stage broadcasts.

2|Updated Feb 9, 2026
One-click install
npx skills add https://github.com/yokobond/scratch-skills --skill scratch-multi-sprite-drawing
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: scratch-multi-sprite-drawing
Source: https://github.com/yokobond/scratch-skills/tree/main/plugins/scratch-coding/skills/scratch-multi-sprite-drawing
Command: npx skills add https://github.com/yokobond/scratch-skills --skill scratch-multi-sprite-drawing

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill solves the issue of multiple Scratch sprites erasing each other's drawings when using the pen extension simultaneously by providing a synchronization pattern.

Core Features & Use Cases

  • Synchronized Pen Clearing: Ensures the pen canvas is cleared exactly once before any drawing begins.
  • Multi-Sprite Coordination: Enables multiple sprites to draw concurrently without interference.
  • Use Case: Create a Scratch project where several sprites draw different parts of a complex scene, like a cityscape, ensuring all drawings appear together without being erased by individual "pen clear" commands.

Quick Start

Use the scratch-multi-sprite-drawing skill to make multiple sprites draw simultaneously on the Scratch canvas.

Frequently Asked Questions about scratch-multi-sprite-drawing

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
Why do my Scratch sprites erase each other's pen drawings when running simultaneously?

Scratch sprites erase each other's pen drawings because individual pen clear commands execute unpredictably. This Skill synchronizes pen clearing via stage broadcasts, ensuring the canvas is cleared exactly once before all sprites begin drawing concurrently without interference.

How do I coordinate multiple sprites drawing on the same Scratch canvas at the same time?

To coordinate multi-sprite drawing in Scratch, this Skill uses stage broadcasts to synchronize drawing initiation. It triggers all sprites to start their pen drawing simultaneously after a single coordinated pen clear, preventing partial erasure across multiple sprites.

Do I need the scratch-vm-injection skill to use multi-sprite pen drawing in Scratch?

Yes, multi-sprite pen drawing requires the scratch-vm-injection skill and access to the Scratch VM window object. These dependencies allow direct block manipulation to enforce the synchronized broadcast pattern for clearing and drawing.

What is the best way to prevent partial erasure in Scratch pen extension projects with multiple sprites?

The best way to prevent partial erasure in Scratch pen projects is using a stage broadcast synchronization pattern. This Skill ensures the pen canvas is cleared once globally before any sprite drawing starts, eliminating execution order conflicts.

Can I use this multi-sprite pen coordination approach for complex Scratch scenes like a cityscape?

Yes, this multi-sprite pen coordination is designed for complex Scratch scenes like a cityscape. It enables multiple sprites to draw different parts of a scene concurrently, ensuring all drawings appear together without being erased by individual pen clear commands.

When should I not use stage broadcasts for Scratch pen drawing synchronization?

You should not use stage broadcasts for Scratch pen drawing if your project involves only a single sprite drawing at a time. This synchronization pattern specifically addresses multi-sprite concurrent execution order issues and requires scratch-vm-injection for block manipulation.