spirograph

SpiroCircle sc;

float r1, incr;

boolean pause;

int count;

float currentMouseX;

float currentMouseY;

​

void setup() {

  size(400,400);

  strokeWeight(25);

  smooth();

  sc = new SpiroCircle();

  r1 = 0.0;

  incr = 0.2;

  pause = false;

}

void draw() {

  r1+=incr;

  if(r1>width/2)

    r1=0.0;

  if(keyPressed) {

    if(key>='1' && key<='9')

      incr=((int) key-'1'+1)/20.0;

    if(key==' ')

      pause=true;

    else

      pause=false;

  }

  if(!pause) {

    background(0);

    currentMouseX = mouseX;

    currentMouseY = mouseY;

    if(currentMouseX == 0){

     currentMouseX = 300;  

    }

    if(currentMouseY == 0){

     currentMouseY = 300;  

    }

    // println(str(currentMouseX));

    sc.init(width/2, height/2, r1, currentMouseX/2, currentMouseY/2);

    sc.drawIterations(1000, incr);

  }

  /*

  if (mousePressed){

    count ++;

    save("AE_" + str(count));

  }

  */

}

class SpiroCircle {

  int center_x = 0;

  int center_y = 0;

  float r1 = 0;

  float r2 = 0;

  float h = 0;

  float x, y, prev_x, prev_y;

  int iter;

  boolean first;

  // constructor

  public void SpiroCirle() {

  }

  public void init(int x, int y, float radius_1, float radius_2, float point_distance) {

    center_x = x;

    center_y = y;

    r1 = radius_1;

    r2 = radius_2;

    h = point_distance;

    first = true;

  }

  public void drawIterations(int iter, float incr) {

    float rads = 0.0;

    for(int i=0; i < iter * 1; ++i) {

      stroke(255);

      drawPoint(rads);

      rads+=incr;

    }

  }

  private void drawPoint(float rads) {

    float x, y;

    x = center_x + (r1-r2)*cos(rads)+h*cos((r1-r2)/r2*rads);

    y = center_y + (r1-r2)*sin(rads)+h*sin((r1-r2)/r2*rads);

    if(first) {

      first = false;

    }

    else {

      strokeWeight(3);

      // line(prev_x, prev_y, x,y);

      // strokeWeight(17);

      //rect(x,y,1,1);

      point(x,y);

      line(x,y,prev_x,prev_y);

    }

    prev_x = x;

    prev_y = y;

  }

}

​

​

​