소개

주의

code

ArrayList<Koch>koch=new ArrayList<Koch>();
ArrayList<Koch>kochSTK=new ArrayList<Koch>();

void setup() {
  size(800, 800);
  strokeWeight(0);
  stroke(#ffffff);
  fill(255);
  noFill();
  int n=6;
  for (int i=0; i<n; i++) {
    float d=i*TWO_PI/n;
    float r=width*0.37;
    koch.add(new Koch(width/2+cos(d)*r, height/2+sin(d)*r, 
      width/2+cos(d+TWO_PI/n)*r, height/2+sin(d+TWO_PI/n)*r));
  }
  noLoop();
}

void mousePressed() {
    redraw();
}

void draw() {
  background(0);

  beginShape();
  for (Koch k : koch) {
    k.update();
    kochSTK.addAll(k.mkKoch());
  }
  endShape();
  koch.clear();
  koch.addAll(kochSTK);
  kochSTK.clear();

  println("step : "+frameCount);
}

public class Koch {
  float sx, sy, ex, ey;
  public Koch(float sx, float sy, float ex, float ey) {
    this.sx=sx;
    this.sy=sy;
    this.ex=ex;
    this.ey=ey;
  }

  public void update() {
    vertex(sx, sy);
    vertex(ex, ey);
  }

  public ArrayList<Koch>mkKoch() {
    ArrayList<Koch>koch=new ArrayList<Koch>();
    float l=sqrt((sq(sx-ex)+sq(sy-ey)))/3;
    float a=atan2(ey-sy, ex-sx)+PI/3;
    float x=lerp(sx, ex, 1./3.);
    float y=lerp(sy, ey, 1./3.);
    float xx=x+cos(a)*l;
    float yy=y+sin(a)*l;
    koch.add(new Koch(sx, sy, x, y));
    koch.add(new Koch(x, y, xx, yy));
    x=lerp(sx, ex, 2./3.);
    y=lerp(sy, ey, 2./3.);
    koch.add(new Koch(xx, yy, x, y));
    koch.add(new Koch(x, y, ex, ey));
    return koch;
  }
}

실행 결과

참고문헌