[p5.js 2.0+ Bug Report]: Vector.lerp() is hard coded to use three dimensions

[sidwellr]

Most appropriate sub-area of p5.js?

• Accessibility
• Color
• Core/Environment/Rendering
• Data
• DOM
• Events
• Image
• IO
• Math
• Typography
• Utilities
• WebGL
• WebGPU
• p5.strands
• Build process
• Unit testing
• Internationalization
• Friendly errors
• Other (specify if possible)

p5.js version

2.3.0

Web browser and version

Brave 1.90.122

Operating system

Linux Mint 22.1

Steps to reproduce this

Steps:

1. Create two 4D vectors
2. Use lerp() to interpolate between the two
3. Note the result only works for the first three dimensions

Snippet:

function setup() {
  let v1 = createVector(0, 1, 0, 1);
  let v2 = createVector(1, 0, 1, 0);
  v1.lerp(v2, 0.5);
  
  // v1 should be vector[0.5, 0.5, 0.5, 0.5], but is actually vector[0.5, 0.5, 0.5, 1]
  print(v1.toString());
}

Discussion

lerp() currently computes x, y, and z individually. To extend to vectors of any dimension, other vector methods can be used, like p5.Vector.add(v1, p5.Vector.sub(v2, v1).mult(c)). Of course, this needs to be adapted to both the instance and static methods.