Function distance

Calculate distance between two points. If both points have a z property, the distance is 3D distance is calculated. If only one point has a z, it is ignored.

// Distance between two points
const ptA = { x: 0.5, y:0.8 };
const ptB = { x: 1, y: 0.4 };
distance(ptA, ptB);
// Or, provide x,y as parameters
distance(ptA, 0.4, 0.9);

// Distance from ptA to x: 0.5, y:0.8, z: 0.1
const ptC = { x: 0.5, y:0.5, z: 0.3 };
// With x,y,z as parameters:
distance(ptC, 0.5, 0.8, 0.1);
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