import processing.svg.*;

void setup(){
  noLoop();
  size(800,800);
  stroke(0);
  background(255);
  beginRecord(SVG, "spiral.svg");

}

float diameter = 800;


void draw(){
  float angle = 0;
  float r  = 1;
  float r_step =0.4;
  float angle_step = 0.1;
  translate(width/2,height/2);
  float x_tmp = 0;
  float y_tmp = 0;
  while(r < width/2-10){
    r += r_step;
    angle += angle_step;
    float x = r*sin(angle);
    float y = r*cos(angle);
    line(x_tmp,y_tmp,x,y);
    x_tmp = x;
    y_tmp = y;
  }
    r+=9;
    while(r > 0){
    r -= r_step;
    angle -= angle_step;
    float x = r*sin(angle);
    float y = r*cos(angle);
    line(x_tmp,y_tmp,x,y);
    x_tmp = x;
    y_tmp = y;
  }
endRecord();
}