spec: add quiver-basic specification

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New Specification: quiver-basic

Closes #1014

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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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