Polka Dots and Moonbeams.

Beautiful polks dots and connected lines.
Beautiful polks dots and connected lines.


Description.

Creative coding example made with Processing.

I got the motivation to make this Node Garden animation from the article of おかず(@okazz_).

ProcessingでGenerative art #65
https://note.mu/outburst/n/n990dcd4a8b1e

At first, I rotate these nodes, but it moves too fast to make twitter loop animation.

So, I moved them on a straight line.

This code does not display any images on the screen but generates image files for animation.
You can make an animation with these files.

Processing example Code.

Please feel free to use it, if you like it.
To see other works based on my code is my pleasure. And my honor.



// Polka Dots and Moonbeams.
// @author @deconbatch
// @version 0.1
// Processing 3.2.1
// 2019.01.13

void setup() {

  size(720, 720);
  colorMode(HSB, 360, 100, 100, 100);
  smooth();
  noLoop();

}

void draw() {

  translate(width / 2, height / 2);

  int   frameCntMax  = 24 * 6;
  int   nodeCntMax   = 10;
  float limitLen     = width * 0.25;
  float baseHue      = random(360.0);
  float baseRotation = random(PI);

  Node [] nodes = new Node[nodeCntMax];
  for (int i = 0; i < nodeCntMax; ++i) {
    nodes[i] = new Node(baseHue);
  }

  for (int frameCnt = 0; frameCnt < frameCntMax; ++frameCnt) {

    float frameRatio = map(frameCnt, 0, frameCntMax, 0.0, 1.0);
    
    background(0.0, 0.0, 90.0, 100.0);
    pushMatrix();
    rotate(baseRotation);
    
    for (int nodeCnt = 0; nodeCnt < nodeCntMax; ++nodeCnt) {

      // shift start frame of easing with each node
      float easingRatio = easeInOutPow((frameRatio + nodeCnt * 1.0 / nodeCntMax) % 1.0);

      // animate each node
      float radius = map(
                         nodeCnt,
                         0,
                         nodeCntMax,
                         width * (0.1 + 0.4 * sin(PI * easingRatio)),
                         width * (0.5 - 0.5 * sin(PI * easingRatio))
                         );

      // initial location, using noise() as array of random()
      float radian = HALF_PI * nodeCnt * (1.0 + noise(nodeCnt));

      float x = radius * cos(radian);
      float y = radius * sin(radian);

      nodes[nodeCnt].setNode(x, y);

    }

    // draw lines
    for (int i = 0; i < nodeCntMax - 1; i++) {
      for (int j = i + 1; j < nodeCntMax; j++) {
        nodes[i].drawLine(nodes[j], limitLen);
      }
    }

    // draw dots
    for (int i = 0; i < nodeCntMax; i++) {
      nodes[i].drawDot();
    }

    popMatrix();
    casing(baseHue);
    saveFrame("frames/" + String.format("%04d", frameCnt) + ".png");

  }

  exit();

}

  
/**
 * easeInOutPow easing function.
 * @param  t     0.0 - 1.0 : linear value.
 * @return float 0.0 - 1.0 : eased value.
 */
private float easeInOutPow(float t) {
  return t * t;
}

/**
 * casing : draw fancy casing
 * @param  hueBase : casing color.
 */
private void casing(float baseHue) {

  rectMode(CENTER);
  fill(0.0, 0.0, 0.0, 0.0);
  strokeWeight(40.0);
  stroke(baseHue, 100.0, 10.0, 100.0);
  rect(0.0, 0.0, width, height);
  strokeWeight(30.0);
  stroke(0.0, 0.0, 100.0, 100.0);
  rect(0.0, 0.0, width, height);
  noStroke();

}

/**
 * Keeping node information. Drawint polka dot and line between nodes.
 * @param  baseHue 0.0 - 360.0 : draw points color.
 */
private class Node {

  private float nX, nY;
  private float nSize;
  private float nHue, nSat, nBri;

  Node(float basnHue) {

    nX    = 0.0;
    nY    = 0.0;
    nSize = 0.0;
    nHue  = (basnHue + random(60.0)) % 360.0;
    nSat  = random(30.0, 60.0);
    nBri  = random(60.0, 80.0);

  }

  public void setNode(float pX, float pY) {

    nX = pX;
    nY = pY;
    nSize = sqrt(dist(0.0, 0.0, pX, pY)) * 2.0;

  }

  public float getNodeX() {
    return nX;
  }

  public float getNodeY() {
    return nY;
  }

  /**
   * drawDot : draw two polka dots symmetrically.
   */
  public void drawDot() {

    strokeWeight(3.0);
    stroke(0.0, 0.0, 90.0, 100.0);
    fill(nHue, nSat, nBri, 100.0);
    ellipse(nX, nY, nSize, nSize);
    ellipse(-nX, -nY, nSize, nSize);

  }

  public void drawLine(Node toNode, float limitLen) {
  
    float distance = dist(nX, nY, toNode.getNodeX(), toNode.getNodeY());

    if (distance < limitLen) {
      strokeWeight(map(distance, 0.0, limitLen, 5.0, 0.2));
      stroke(
             nHue,
             map(distance, 0.0, limitLen, 0.0, 30.0),
             nBri,
             100
             );
      line(nX, nY, toNode.getNodeX(), toNode.getNodeY());
      line(-nX, -nY, -toNode.getNodeX(), -toNode.getNodeY());

    }
  
  }

}

/*
Copyright (C) 2019- deconbatch

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see 
*/



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