Problems With Constructor!

Bhuvanesh

Polygon triangle; void setup() { size(500,500); triangle = new Polygon (3,100,width/2,height/2) ; } void draw() { triangle.display() ; }

class Polygon { int n, r, x, y; float angle ; void Polygon (int tn, int tr, int tx, int ty) { angle = 360/tn; n=tn; r=tr; x=tx; y=ty; }

void display() { strokeWeight(2); for (int i=0; i<n; i++) { point((x+rcos(anglei)), (y-rsin(anglei))) ; } } }

Hello to beautiful community of processing! I've recently discovered processing and have stumbled into an error which i cant get rid off even after an hour of googling. Its because I'm not familiar with Java and have learnt a bit of C++ . Can you please take a look at the code and tell me whats going on wrong?

The Error I'm getting is : The Constructor Polygon does not exist. Thanks

Bhuvanesh

GoToLoop

https://forum.Processing.org/two/discussion/15473/readme-how-to-format-code-and-text

In Java, constructors don't have any returning datatype & are named exactly as its class' name. ~O)
Even void isn't allowed on them! [-X

Chrisir

Polygon triangle;

void setup() {
  size(500, 500);
  triangle = new Polygon (3, 100, width/2, height/2) ;
}

void draw() {
  triangle.display() ;
}

// ================================================

class Polygon {

  int n, r, x, y;
  float angle;

  Polygon (int tn, int tr, int tx, int ty) { 
    angle = 360/tn;
    n=tn;
    r=tr;
    x=tx;
    y=ty;
  }

  void display() {
    strokeWeight(2);
    for (int i=0; i<n; i++) {
      point((x+r*cos(angle*i)), (y-r*sin(angle*i)))  ;
    }
  }
}//class
//

jeremydouglass

Consider going through the Objects Tutorial

• https://processing.org/tutorials/objects/

and looking at some of the objects-based examples in the Examples Sketchbook.