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Wave Representations Model Relations

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relation created by wee lookang

added 2 new features f and phi phase lead

changes made:
fixed the " with ' which is giving some error message in Ejs 4.3.3
re arrange to usual layout and color scheme
made the 2 x1 and x2 points drag-gable to improve usability
made feedback immediate, improve user experience
added frequency = 1/T
added phase lead of x1 to x2 = (xval2-xval)/lambda*2*Math.PI;
added a better code to code for phase lead in multiple of 2*Math.PI thanks to Hwang Fu-Kwun expert advise
http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2179.0

if (Math.abs(phi%(2*Math.PI)-enterphi%(2*Math.PI)) < 0.1){
phicorrect = " Yes";
  phicorrectbackground = java.awt.Color.GREEN;
  }
  else {
  phicorrect = " No";
  phicorrectbackground = java.awt.Color.RED;

  }



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