openjscad utility cylinderFromTo

testCylinderFromTo.js

const jscad = require('@jscad/modeling')
const { connectors, geometry, math, primitives, text, utils, booleans, expansions, extrusions, hulls, measurements, transforms } = jscad

const { translate, scale, center, rotate } = transforms
const { cuboid, sphere, cylinder, circle, star,cylinderElliptic } = jscad.primitives

function main(){
  var ret = [];
  function testCylinderFromTo(p1,p2){
    ret = [ ...ret,
      translate(p1,sphere({size:1})),
      translate(p2,sphere({size:1})),
      jscad.colors.colorize([1,0,0,0.7],cylinderFromTo(p1,p2,2)),
    ];
  }

  testCylinderFromTo([-20,30,50],[-40,-10,70]);
  testCylinderFromTo([0,0,0],[10,10,10])
  testCylinderFromTo([0,0,0],[20,-20,20])
  testCylinderFromTo([0,0,0],[-30,30,30])
  testCylinderFromTo([0,0,0],[-40,-40,40])

  testCylinderFromTo([0,0,0],[15,15,-15])
  testCylinderFromTo([0,0,0],[25,-25,-25])
  testCylinderFromTo([0,0,0],[-35,35,-35])
  
  testCylinderFromTo([100,0,0],[100,0,30])
  testCylinderFromTo([100,0,0],[100,0,-30])
  testCylinderFromTo([100,0,0],[100,30,0])
  testCylinderFromTo([100,0,0],[100,-30,0])
  testCylinderFromTo([100,0,0],[130,0,0])
  testCylinderFromTo([100,0,0],[70,0,0])

  return ret;
}


function cylinderFromTo(p1,p2, radius){
  const sqr = x=>x*x

  let dx = p2[0] - p1[0]
  let dy = p2[1] - p1[1]
  let dz = p2[2] - p1[2]

  let height = Math.sqrt( sqr(dx) + sqr(dy) + sqr(dz))
  let obj = cylinder({radius, height})

  if(dx || dy){
    let dxy = Math.sqrt( sqr(dx) + sqr(dy))
    
    let ay = Math.atan(dxy/dz) *(dx < 0 ? -1:1) 
    let az = Math.atan(dy/dx)
    let ax = dz < 0 ? -Math.PI:0
    obj = rotate([ax,ay,az], obj)
  }

  let mid = [p1[0]+dx/2,p1[1]+dy/2,p1[2]+dz/2]

  return translate(mid, obj)
}


module.exports = {main}