Middle pressure draws the base width; the width runs from base over the scale at a light touch to base times the scale at full pressure. Threshold is a dead zone: pressure below it counts as the lightest touch. A mouse, reporting no pressure, draws the base width. Curve is the response exponent applied after: above 1 spreads out light touches, below 1 compresses them. Limit caps how fast the width may rise or fall per unit of length. Min move is how far the pen must travel before a new point is recorded; below it, nothing is added and the width cannot grow in place. Lengths here are CSS pixels.

Strokes bake into the canvas on release; an abrupt turn starts a new stroke. A mouse draws at the base width.