Static p5_sys::global::curveTangent

pub static curveTangent: CurveTangentInternalType

Evaluates the tangent to the curve at position t for points a, b, c, d. The parameter t varies between 0 and 1, a and d are points on the curve, and b and c are the control points.

Examples

noFill();
curve(5, 26, 73, 24, 73, 61, 15, 65);
let steps = 6;
for (let i = 0; i <= steps; i++) {
  let t = i / steps;
  let x = curvePoint(5, 73, 73, 15, t);
  let y = curvePoint(26, 24, 61, 65, t);
  //ellipse(x, y, 5, 5);
  let tx = curveTangent(5, 73, 73, 15, t);
  let ty = curveTangent(26, 24, 61, 65, t);
  let a = atan2(ty, tx);
  a -= PI / 2.0;
  line(x, y, cos(a) * 8 + x, sin(a) * 8 + y);
}

Parameters

a coordinate of first control point

b coordinate of first point on the curve

c coordinate of second point on the curve

d coordinate of second conrol point

t value between 0 and 1