[quiver-basic] Basic Quiver Plot (Vector Field)

[MarkusNeusinger]

Description

A quiver plot displays vector fields using arrows at grid points. Each arrow shows direction and magnitude of a vector (like velocity, force, or gradient) at that location, revealing flow patterns and field structure.

Key Features

• Arrows positioned on a grid
• Arrow direction shows vector direction
• Arrow length/size shows magnitude
• Reveals flow patterns and gradients

Applications

• Wind and ocean current visualization
• Electromagnetic field visualization
• Gradient fields in optimization
• Fluid dynamics simulation output

Data Requirements

• x, y (numeric arrays) - Arrow positions
• u, v (numeric arrays) - Vector components (dx, dy)
• Grid: typically 10x10 to 30x30 arrows for clarity

Visual Elements

• Arrows with heads indicating direction
• Arrow length proportional to magnitude
• Optional: color encoding magnitude or other variable
• Background grid or contours optional
• Clear spacing between arrows

[claude]

✅ Spec ID: quiver-basic

Rationale: A quiver plot is a distinct visualization type for vector fields using arrows - no existing spec covers this. The ID follows the standard {type}-{variant} format.

Add label approved to begin generation.

[github-actions]

✅ Specification Ready: quiver-basic

PR: #1026

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specification.md

quiver-basic: Basic Quiver Plot

Description

A quiver plot displays vector fields using arrows positioned at grid points. Each arrow represents a vector at that location, with direction indicating the vector's angle and length proportional to its magnitude. This visualization reveals flow patterns, gradients, and field structure in two-dimensional data.

Applications

• Visualizing wind patterns or ocean currents in meteorology and oceanography
• Displaying electromagnetic field lines in physics simulations
• Showing gradient descent directions in optimization landscapes
• Illustrating fluid flow patterns in computational fluid dynamics

Data

• x (numeric array) - X-coordinates of arrow positions on a grid
• y (numeric array) - Y-coordinates of arrow positions on a grid
• u (numeric array) - Horizontal component (dx) of each vector
• v (numeric array) - Vertical component (dy) of each vector
• Size: Typically 10x10 to 20x20 grid (100-400 arrows) for visual clarity
• Example: A 2D flow field such as u = -y, v = x creates a circular rotation pattern

Notes

• Arrow spacing should be uniform and sufficient to prevent overlap
• Arrow length should be scaled appropriately so vectors are distinguishable
• Consider using a simple mathematical function (like rotation or gradient) to generate sample data
• Optional: color can encode magnitude for additional insight

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Next: Add approved label to merge this specification to main.

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🤖 spec-create workflow

[github-actions]

🚀 Specification Merged!

Specification: quiver-basic
PR: #1026 (merged)

The specification is now in main and synced to PostgreSQL.

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Next: Add generate:{library} labels to start generating implementations.

Available libraries: matplotlib, seaborn, plotly, bokeh, altair, plotnine, pygal, highcharts, letsplot

Or use workflow dispatch for bulk operations.

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🤖 spec-create workflow