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void paint(Canvas canvas, Size size) {
final hr = boxH / (_max - _min); // height per unit value
final lt = Offset(border + boxW / 2.0, border);
final points = _computePoints(lt, boxW, boxH, hr);
final path = _computePath(points);
canvas.drawPath(path, linePaint);
_drawDataPoints(canvas, points, dotPaintFill);
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