conic-toan:0.3.8

[Thutran1891]

Update conic-toan to 0.3.8.

Added

• Add duong-path, a general open or closed drawing path that combines
  straight segments, circular or elliptic arcs, cubic Bézier segments, and
  sampled function or parametric graphs before applying one fill and stroke.
  It supports multiple subpaths via bat-dau, tangent-aligned arrowheads at
  the overall endpoints, and optional closing of every subpath. duong-kin
  remains the concise always-closed compatibility wrapper. Unlike
  overlapping independently filled shapes, semi-transparent fills do not
  darken at internal overlaps and no artificial seams are produced.
• Add the path segment constructors noi-thang, noi-cung,
  noi-cung-elip, noi-bezier, noi-do-thi, noi-tham-so, and noi-cuc.
  Ordinary points are shorthand for straight segments.
• noi-do-thi(f, a, b, n: 80) supports both increasing and decreasing
  bounds, allowing a graph boundary to be traversed in either direction.
  Functions used as path boundaries must be finite and continuous over the
  sampled interval.
• Add optional mui-ten-dau and mui-ten-cuoi parameters to cung and
  cung-elip. Each accepts an arrowhead size (for example 6pt), follows the
  actual tangent at that endpoint (including reversed and rotated arcs), and
  defaults to none.
• Add ve-tham-so for parametric curves and ve-cuc for polar curves. Both
  use the existing drawing context, split samples outside the viewport, and
  support endpoint arrowheads. lay-mau-tham-so exposes the sampled points.
• Add composable affine drawing contexts: ctx-affine, ctx-ti-le,
  ctx-nghieng, and ctx-doi-xung. Reflection supports the coordinate axes,
  a point, or an arbitrary line through two points. Circles now follow the
  full affine transform instead of transforming only their centers.
• Add giao-duong-cong, which approximates all intersections of two
  parametric curves over supplied parameter intervals.
• Add lightweight free-drawing nodes with nut-hinh and ve-nut, plus
  noi-nut connectors that automatically meet rectangular, rounded,
  circular, or elliptic node boundaries. Compass anchors can be selected
  explicitly when automatic boundary intersection is not desired.

Fixed

• Draw truc-so with a single arrowhead at the right end, matching the
  positive direction of the number line, instead of arrowheads at both ends.
• Move number-line labels slightly farther below their ticks so endpoint
  brackets no longer obscure the labels.
• Place coordinate labels for extrema intelligently in the built-in cubic,
  biquadratic, and quadratic-over-linear graphs. The x-coordinate label is
  placed below the axis for a positive y-value and above it for a negative
  y-value; the y-coordinate label is placed to the left for a positive
  x-value and to the right for a negative x-value. At extrema on the y-axis,
  the y-coordinate label uses above-left or below-left according to its
  sign. Explicit per-point label directions continue to override these
  defaults.
• Avoid duplicate y-coordinate labels for the two symmetric outer extrema of
  a biquadratic graph when automatic labeling is used.

Implementation notes

• The implementation uses Typst's native curve.move, curve.line,
  curve.cubic, and curve.close primitives and requires no external
  package.
• Circular and elliptic arcs are converted to cubic Bézier pieces spanning
  at most 90 degrees by default. Rotated ellipses are supported, and callers
  can override the number of pieces with chia:.
• Arc arrowheads use the analytic endpoint derivative of the circle or
  ellipse, then apply rotation and the drawing-context transform. Their
  direction is therefore independent of the sampling count n.
• All endpoints and control points pass through the drawing context's
  coordinate transform. The resulting curve is normalized inside one
  positioned box, so hinh automatic viewport detection measures it
  correctly.
• When an arc or graph starts away from the current point, a straight joining
  segment is inserted automatically. A Bézier segment requires a preceding
  current point.
• Parametric intersections use sampled segment pairs with bounding-box
  rejection and geometric deduplication. Increasing n improves accuracy
  for strongly curved paths or nearby intersections.
• Node sizes are measured from their content in the active context;
  connectors calculate boundary intersections in page coordinates so text
  padding remains exact regardless of graph scale.

Validation

• Compiled with Typst 0.13.7.
• Added thu-duong-kin.typ covering a capsule made from lines and arcs, a
  region bounded jointly by a parabola and a semicircle, a rotated elliptic
  arc combined with a cubic Bézier segment, a reversed function-graph
  boundary, automatic viewport detection, and elliptic arcs with integrated
  tangent-aligned arrowheads.
• Added thu-giong-cuc-tri.typ covering extrema on both sides of each axis,
  extrema lying on the y-axis with positive and negative ordinates, cubic,
  biquadratic, and quadratic-over-linear graphs, and explicit direction
  overrides.
• Added thu-tikz-0.3.8.typ, a visual integration test covering open and
  multi-subpath paths, endpoint arrowheads, parametric and polar plots,
  composed affine transforms, parametric intersections, and automatic or
  explicit node anchors/connectors.