Scripting Example: Triskelion x5

This is an advanced feature: see Scripting Explained.

To make this print:

Use this script:

var CENTER_X = 126, CENTER_Y = 84;

function reverse(arr) {

  var res = [];

  for (var i = 0; i < arr.length; i += 2) {

    res[i] = arr[arr.length - i -2];

    res[i+1] = arr[arr.length - i -1];

  }

  return res;

}

function triskelion(Nsp, Nwh, a) {

  var block1 = [];

  var block2 = [];

  var points = [];

  var a,c,r,t,x,y,x0,y0,t1,t2;

  var dt = 0.04;

  for (var n=0; n < Nsp; n++) {

      r=0;

      t=0;

      x0=CENTER_X+a*Math.cos(2*Math.PI*n/Nsp);

      y0=CENTER_Y+a*Math.sin(2*Math.PI*n/Nsp);

      t1=2*Math.PI*Nwh-Math.PI/Nsp+Math.PI/2;

      t2=t1+2*Math.PI/Nsp;

      c=a*Math.sin(Math.PI/Nsp)*2/Math.PI/(1+4*Nwh);

      savedt=t;

      do {    

        t=t+dt;

        r=c*t;

        x=x0+r*Math.cos(t+Math.PI+2*Math.PI*n/Nsp);

        y=y0+r*Math.sin(t+Math.PI+2*Math.PI*n/Nsp);

        points.push(x);

        points.push(y);

      } while (t < t1);

      block1.push(points);

      points=[];

      t=savedt;

      do {

        t=t+dt;

        r=c*t;

        x=x0+r*Math.cos(t+2*Math.PI*n/Nsp);

        y=y0+r*Math.sin(t+2*Math.PI*n/Nsp);

        points.push(x);

        points.push(y);

        

      } while (t<t2);

      block2.push(points);

      points=[];

  }

  var merged = [];

  merged=merged.concat(block2[0]);

  for (var i = 1; i < Nsp; i++) {

    merged=merged.concat(reverse(block1[i]));

    merged=merged.concat(block2[i]);

  }  

  merged=merged.concat(reverse(block1[0]));

  return merged;

}

foodini.useIngredient(ingredients[0]);

var points = triskelion(5, 2, 40);

foodini.drawPolyline(points);

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