topical media & game development
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#javascript-processing-example-basic-control-logicaloperators.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>LogicalOperators</h2>
  
  <p>The logical operators for AND (&amp;&amp;) and OR (||) are used to 
  combine simple relational statements into more complex expressions.
  The NOT (!) operator is used to negate a boolean statement.</p>
  
  <p><a href="http://processing.org/learning/basics/logicaloperators.html"><b>Original Processing.org Example:</b> LogicalOperators</a><br>
  <script type="application/processing">
  size(200, 200);
  background(126);
  
  boolean op = false;
  
  for(int i=5; i<=195; i+=5) {
    // Logical AND
    stroke(0);
    if((i > 35) && (i < 100)) {
      line(5, i, 95, i);
      op = false;
    }
    
    // Logical OR
    stroke(76);
    if((i <= 35) || (i >= 100)) {
      line(105, i, 195, i);
      op = true;
    }
    
    // Testing if a boolean value is "true"
    // The expression "if(op)" is equivalent to "if(op == true)"
    if(op) {
      stroke(0);
      point(width/2, i);
    }
      
    // Testing if a boolean value is "false"
    // The expression "if(!op)" is equivalent to "if(op == false)"
    if(!op) {
      stroke(255);
      point(width/4, i);
    }
  }
  </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>
  size(200, 200);
  background(126);
  
  boolean op = false;
  
  for(int i=5; i&lt;=195; i+=5) {
    // Logical AND
    stroke(0);
    if((i &gt; 35) &amp;&amp; (i &lt; 100)) {
      line(5, i, 95, i);
      op = false;
    }
    
    // Logical OR
    stroke(76);
    if((i &lt;= 35) || (i &gt;= 100)) {
      line(105, i, 195, i);
      op = true;
    }
    
    // Testing if a boolean value is "true"
    // The expression "if(op)" is equivalent to "if(op == true)"
    if(op) {
      stroke(0);
      point(width/2, i);
    }
      
    // Testing if a boolean value is "false"
    // The expression "if(!op)" is equivalent to "if(op == false)"
    if(!op) {
      stroke(255);
      point(width/4, i);
    }
  }</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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