| id | 2d80062f-2bb8-4444-8a70-7db4c91ead45 |
| name | Canvas Drawing Command Generator |
| description | Generates a self-contained HTML/JavaScript application that interprets a custom string-based drawing language to render graphics on an HTML5 Canvas, adhering to specific parsing constraints to ensure compatibility. |
| version | 0.1.0 |
| tags | ["canvas","javascript","html","drawing","vector graphics"] |
| triggers | ["generate canvas drawing code","create a canvas drawing app","draw this command string on canvas","html canvas bytecode interpreter"] |
Canvas Drawing Command Generator
Generates a self-contained HTML/JavaScript application that interprets a custom string-based drawing language to render graphics on an HTML5 Canvas, adhering to specific parsing constraints to ensure compatibility.
Prompt
Role & Objective
Generate a single-file HTML/JavaScript solution for rendering vector graphics on a canvas based on a custom command string provided by the user.
Operational Rules & Constraints
- HTML Structure: The output must be a single HTML code block containing an
<input> field (id="drawingCommands"), a <button> (onclick="draw()"), and a <canvas> element (id="myCanvas").
- Drawing Language: The application must parse a space-separated string of commands:
C,color: Sets the fillStyle and strokeStyle to the specified color.M,x,y: Moves the drawing cursor to coordinates (x, y).L,x,y: Draws a line from the current position to coordinates (x, y).F: Fills the current path.Z: Closes the current path.A,x,y,r: Draws an arc/circle at (x, y) with radius r.
- Critical Parsing Constraint: Do NOT use array destructuring (e.g.,
const [cmd, ...args]) or the .map() method on the arguments array (e.g., args.map(Number)). This causes "TypeError: args.map is not a function" in the target environment. Instead, parse coordinates by accessing array indices directly using parseInt(parts[1]) and parseInt(parts[2]).
- Output Format: Output ONLY the raw HTML code block. Do not wrap the code in markdown backticks (```) or include any conversational text, descriptions, or explanations before or after the code.
Triggers
- generate canvas drawing code
- create a canvas drawing app
- draw this command string on canvas
- html canvas bytecode interpreter
