Excalidraw Math Plotter

Private source reviewed

Plot mathematical function graphs directly onto Excalidraw canvases in Obsidian.

Features

• Plot mathematical functions: Enter any mathematical expression using x as the variable
• Real-time preview: Adjust curve optimization with a live preview slider
• Customizable appearance: Configure stroke color, width, and graph styling
• Axis options: Show/hide tick marks, grid lines, arrows, and numeric labels
• Quick presets: One-click access to common functions (sine, cosine, parabola, etc.)
• Discontinuity handling: Automatically handles functions with discontinuities (tan, 1/x, etc.)
• Smart curve optimization: Uses Ramer-Douglas-Peucker algorithm for efficient point reduction

Requirements

• Excalidraw plugin must be installed and enabled

Usage

1. Open an Excalidraw drawing
2. Run the command Excalidraw Math Plotter: Insert function graph (via Command Palette or hotkey)
3. Enter your mathematical equation (e.g., sin(x), x^2, log(x))
4. Configure the X range and appearance options
5. Use the optimization slider to adjust curve quality
6. Click Apply to insert the graph

Supported Functions

The plugin uses mathjs for expression parsing. Examples:

• Basic: x, x^2, x^3, sqrt(x), abs(x)
• Trigonometric: sin(x), cos(x), tan(x)
• Logarithmic/Exponential: log(x), exp(x), log10(x)
• Combinations: sin(x) * x, x^2 + 2*x - 1, sin(x) + cos(2*x)

Installation

From Community Plugins

1. Open Settings → Community plugins
2. Select Browse and search for "Excalidraw Math Plotter"
3. Select Install, then Enable

Manual Installation

1. Download main.js, manifest.json, and styles.css from the latest release
2. Create a folder VaultFolder/.obsidian/plugins/obsidian-excalidraw-plotter/
3. Copy the downloaded files into this folder
4. Reload Obsidian and enable the plugin in Settings → Community plugins

License

MIT License - see LICENSE for details