Migrate Vector Stroke Bounds

Recipe now keeps circle(), ellipse(), rectangle(), arc(), and pie() strokes inside positive requested dimensions large enough to contain the line width, matching the native package. Earlier Wasm releases centered the stroke on the requested boundary, so half the line width extended beyond it.

Most callers need no changes. The corrected behavior makes the requested size the complete painted size and prevents thick strokes from overlapping nearby content unexpectedly. Smaller or negative geometry continues to follow native PDF path behavior and is not guaranteed to remain inside the requested bounds.

The examples below show combined fill-and-stroke calls. If the original shape was stroke-only, omit the fill call and use only the expanded stroke geometry.

Preserve The Previous Rectangle Output

If a layout intentionally relied on the previous overshoot, draw the nominal fill and the expanded stroke separately. Move the stroke origin outward by half the line width and add the full line width to each dimension:

var lineWidth = 10;
var halfLineWidth = lineWidth / 2;

recipe
  .rectangle(50, 50, 100, 60, { fill: "#ffffff" })
  .rectangle(
    50 - halfLineWidth,
    50 - halfLineWidth,
    100 + lineWidth,
    60 + lineWidth,
    { stroke: "#000000", lineWidth },
  );

This also preserves rounded-rectangle stroke placement when the stroke call uses the same borderRadius.

Preserve Center-Based Shape Bounds

Keep the same center and add half the line width to the stroke radius. For an arc or pie, apply the same adjustment to its radius:

var lineWidth = 10;
var halfLineWidth = lineWidth / 2;

recipe
  .circle(100, 100, 40, { fill: "#ffffff" })
  .circle(100, 100, 40 + halfLineWidth, {
    stroke: "#000000",
    lineWidth,
  });

For an ellipse, adding half the line width to both radii preserves the previous outer bounds but not the exact Bézier curve: the native-compatible Recipe implementation derives its control handles from the expanded radii. Use the low-level drawing API when exact reproduction of the previous ellipse path is required.

When a shape uses rotation, skew, opacity, dashes, or other stroke options, repeat those options on the separate stroke call. Set rotationOrigin explicitly to the original shape's origin when expanding geometry that uses rotation.