curve
Create a quadratic curve with one off-curve point.
g.curve({x: -100, y: 0}, {x: 100, y: 0}, 0.5, -100);
Parameters
point1: The starting point of the curve.point2: The ending point of the curve.t: The position of the off-curve point [0 - 1].distance: The offset of the curve from a straight line.