LAB 1 งานชิ้นที 4 หาพื้นที่วงกลมและเส้นรอบวง

CODE
void setup(){
  size(600,600);
}

  int d; //diameter of circle
  int r; //radiuse of circle
  float area; //area of circle
  float circleF;//circleF is circleference




  void draw(){
    background(0);
    d=100+mouseX; //set diameter frome mouseX


  // set up theory
  r=d/2;
  area=PI*(r*r);
  circleF=2*PI*r;


  //circle picture
   stroke(255);
   noFill();
   ellipse(300,200,r,r);

   //line of diameter in x line

   stroke(255,0,0);
   text("diameter",300+(r/6),195);
   line(300+(r/2),200,300-(r/2),200);

   //line of radius in Y line
   stroke(0,255,0);
   line(300,200,300,200+(r/2));
   text("radius",310,200+(r/4));


  //show value
  text("The diameter of this circle is   "+d,50,460);
  text("The radius of this circle is  "+r,50,480);
  text("The area of  this  circle is  "+area,50,500);
  text("The circleference of this circle is  "+circleF,50,520);


}