"""Pure numpy→BGR render helpers for finger 2D panels (no window I/O)."""

from __future__ import annotations

import orisys

from .opencv_maps import depth_colormap


def render_depth_panel(depth_map):
    """Return a BGR depth colormap image."""
    return depth_colormap(depth_map)


def render_uv_arrows(
    unrolled,
    vnormal,
    *,
    flow_threshold: float = 0.4,
    grid_spacing: int = 20,
    arrow_scale: float = 1.0,
):
    """Return a BGR image with UV unrolled flow arrows."""
    return orisys.util.draw_arrows(
        unrolled,
        vnormal,
        threshold=flow_threshold,
        grid_spacing=grid_spacing,
        arrow_scale=arrow_scale,
    )


def render_contact_panel(img, contour, centroid):
    """Return a BGR contact overlay on the raw sensor image."""
    return orisys.util.draw_contact(img, contour, centroid)