drawBorderPath static method

void drawBorderPath(Canvas canvas, Rect rect, Paint borderPaint, Path path, DynamicBorderSide border,)

draw the border with a optional begin, end, and offset

Implementation

static void drawBorderPath(Canvas canvas, Rect rect, Paint borderPaint,
    Path path, DynamicBorderSide border) {
  if (border.begin != null || border.end != null) {
    PathMetric metric = path.computeMetrics().first;

    double beginPX = border.begin?.toPX(constraint: metric.length) ?? 0.0;
    double endPX =
        border.end?.toPX(constraint: metric.length) ?? metric.length;
    double shiftPX = border.shift?.toPX(constraint: metric.length) ?? 0.0;
    double temp = beginPX;
    beginPX = beginPX > endPX ? endPX : beginPX;
    endPX = beginPX == endPX ? temp : endPX;
    beginPX = beginPX.clamp(0, metric.length);
    endPX = endPX.clamp(0, metric.length);
    shiftPX = shiftPX.clamp(0, metric.length);

    path = extractPartialPath(
      metric,
      beginPX + shiftPX,
      endPX + shiftPX,
    );
    if (beginPX + shiftPX < metric.length) {
      canvas.drawPath(path, borderPaint);
      if (endPX + shiftPX > metric.length) {
        path = extractPartialPath(
          metric,
          0.0,
          endPX + shiftPX - metric.length,
        );
        canvas.drawPath(path, borderPaint);
      }
    } else {
      path = extractPartialPath(
        metric,
        beginPX + shiftPX - metric.length,
        endPX + shiftPX - metric.length,
      );
      canvas.drawPath(path, borderPaint);
    }
  } else {
    canvas.drawPath(path, borderPaint);
  }
}