Annotated: electrosim.rendering.field

_get_sampler

• Constructs a cache key from (world_size, ppm, grid_step_px, softening_fraction) to reuse samplers.

draw_field_grid

• Computes screen width/height in pixels.

• Brightness mode:

  • Recompute sampler; draw onto an alpha surface; per-arrow alpha/color from |E|; fixed arrow length.

  • Single blit of the composed surface for performance.

• Sampler length mode:

  • Reuse sampler; per-arrow length scales with |E| clamped to FIELD_VECTOR_MAX_LENGTH_PX*0.6.

• Direct mode (no sampler):

  • Iterate grid points; call electric_field_at_point per cell; map to pixels.

Related: electrosim.rendering.field_sampler, electrosim.simulation.physics.electric_field_at_point().