topical media & game development
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#javascript-processing-example-basic-objects-multipleconstructors.htm / htm



  <!DOCTYPE html>
  <html><head>
  <script src="javascript-processing-example-processing.js"></script>
  <script src="javascript-processing-example-init.js"></script>
  <link rel="stylesheet" href="javascript-processing-example-style.css">
  </head><body><h1><a href="http://ejohn.org/blog/processingjs/">Processing.js</a></h1>
  <h2>MultipleConstructors</h2>
  
  <p>A class can have multiple constructors that assign the fields in different ways. 
  Sometimes it's beneficial to specify every aspect of an object�s data by assigning 
  parameters to the fields, but other times it might be appropriate to define only 
  one or a few.</p>
  
  <p><a href="http://processing.org/learning/basics/multipleconstructors.html"><b>Original Processing.org Example:</b> MultipleConstructors</a><br>
  <script type="application/processing">
  Spot sp1, sp2;
  void setup() 
  {
    size(200, 200);
    background(204);
    smooth();
    noLoop();
    // Run the constructor without parameters
    sp1 = new Spot();
    // Run the constructor with three parameters
    sp2 = new Spot(122, 100, 40);
  }
  
  void draw() {
    sp1.display();
    sp2.display();
  }
  
  class Spot {
    float x, y, radius;
    // First version of the Spot constructor;
    // the fields are assigned default values
    Spot() {
      x = 66;
      y = 100;
      radius = 16;
    }
    // Second version of the Spot constructor;
    // the fields are assigned with parameters
    Spot(float xpos, float ypos, float r) {
      x = xpos;
      y = ypos;
      radius = r;
    }
    void display() {
      ellipse(x, y, radius*2, radius*2);
    }
  }
  </script><canvas width="200" height="200"></canvas></p>
  <div style="overflow: hidden; height: 0px; width: 0px;"></div>
  
  <pre><b>// All Examples Written by <a href="http://reas.com/">Casey Reas</a> and <a href="http://benfry.com/">Ben Fry</a>
  // unless otherwise stated.</b>
  Spot sp1, sp2;
  void setup() 
  {
    size(200, 200);
    background(204);
    smooth();
    noLoop();
    // Run the constructor without parameters
    sp1 = new Spot();
    // Run the constructor with three parameters
    sp2 = new Spot(122, 100, 40);
  }
  
  void draw() {
    sp1.display();
    sp2.display();
  }
  
  class Spot {
    float x, y, radius;
    // First version of the Spot constructor;
    // the fields are assigned default values
    Spot() {
      x = 66;
      y = 100;
      radius = 16;
    }
    // Second version of the Spot constructor;
    // the fields are assigned with parameters
    Spot(float xpos, float ypos, float r) {
      x = xpos;
      y = ypos;
      radius = r;
    }
    void display() {
      ellipse(x, y, radius*2, radius*2);
    }
  }</pre>
  </body></html>
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

(C) Æliens 20/2/2008

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