chmod +x shodo

Based on shodo by Mar­tin Schnei­der. The script out­puts dif­fer­ent states of draw­ing along the path data read from an svg file as pdf. These pdfs get recom­bined with a shell script.

The pro­cess­ing sketch is exe­cuted from within a bash script to ren­der dif­fer­ent files for mul­ti­ple lay­ers imported as dif­fer­ent files. After­wards the lay­ers are com­bined again.

import geomerative.*;
import processing.pdf.*;
 
int i, k, howmanyframes, step, countframe;
float startx, starty;
float[] a = new float[18];
RGroup grp;
RPoint[] points;
String outputdir = "tmp/";
boolean recording = false;
String[]vektorlist;
 
void setup() {
  size(454, 325, P3D);
  //size(1816, 1300, P3D); // change size for thinner lines
 
  frameRate(500);   
  stroke(0);
  smooth();  
  background(255);
 
  vektorlist = loadStrings("vektor.list");
  String file = vektorlist[int(random(0, vektorlist.length))];
  grp = vektorDB(file);
 
  countframe = -1;
  howmanyframes = 10;
  points = grp.getPoints();
  startx = points[0].x;
  starty = points[0].y;  
  //initialize with startpoint
  for(int x=0; x<a.length/2; x++) {
    a[x]   = startx;
    a[x+9] = starty;
  }
  step = points.length / howmanyframes;
  int k = 0;
}
 
void draw() {
  if(k < points.length) {
    if(frameCount%step == 0 && frameCount != 0 && frameCount != 1) {
      countframe++;
      beginRecord(PDF, outputdir + "sho--" + nf(countframe,5) + ".pdf");
      recording = true;
    }
 
    for(int m=0; m<=k ; m++) {
 
      a[9]=points[m].y;
      a[0]=points[m].x;
 
   pushMatrix();
      scale(1.5);
      translate(-100,-100);
 
      for(i=0;++i<9;) {
       if (m == 0) {
        line(0, 
              random(0,height), 
              a[i] += (a[i-1]-a[i])/i, 
              a[i+9] += (a[i+8]-a[i+9])/i );
       }
       else if (m == k) {
        line(a[i], a[i+9], width, random(0,height));
       }
       else {
        line(a[i], 
              a[i+9], 
              a[i] += (a[i-1]-a[i])/i, 
              a[i+9] += (a[i+8]-a[i+9])/i );
      }
     }
 
  popMatrix();
 
    }
 
    if(recording) {
      endRecord();
    }
 
    //reset to startpoints
    for(int x=0; x<a.length/2; x++) {
      a[x]   = startx;
      a[x+9] = starty;
    }
    k++;
  } 
  else {
    exit();
  }
}
 
RGroup vektorDB(String svgpath){
 
  RGroup grp,svg;
  RShape svgload;
  int pathnumber;
 
  // VERY IMPORTANT: Allways initialize the library in the setup
  RG.init(this);
 
  svgload = RG.loadShape(svgpath); 
  grp = new RGroup();
 
  pathnumber = int(split(loadStrings(svgpath)[1],' ')[1]);
 
  for(int i=1; i<=pathnumber; i++){
    grp.addElement(svgload.getChild(str(int(i))));
  }
  return grp;
}