alexpolt.github.io/cam.html at master · alexpolt/alexpolt.github.io · GitHub

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<!DOCTYPE html>
<HTML>

<HEAD>

  <title>WebGL Blank Template - Alexandr Poltavsky, software developer</title>

  <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
  <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
  <meta http-equiv="Pragma" content="no-cache" />

  <link rel="stylesheet" type="text/css" href="css/common.css" />
  <link rel="stylesheet" href="highlight/styles/hybrid.css">

</HEAD>

<BODY>

<div id="wrap">

  <div id="content" style="clear: left">


  <canvas id="demo" width="300" height="300"></canvas>

  <script src="js/common.js"></script>
  <script src="js/math.js"></script>
  <script src="js/camera.js"></script>
  <script src="js/loader.js"></script>
  <script>
  /*
    load_resources (["webgl/lenin2dec.obj"],
      function(o,src,i){console.log("loading",src,i,dump(o));},
      function(o,src,i){console.log("loaded",src,i,dump(o));}
    );
  */

    var canvas = document.getElementById( "demo" );
    var w = canvas.width, h = canvas.height, wc = w/2, hc = h/2, len = 100;
    var ctx = canvas.getContext("2d");

    var cam = camera_create( { element: canvas, nobind: false, personal: false, pos: vec3(0,0,-1) } );
    var x = vec3(), y = vec3(), z = vec3();

    requestAnimationFrame(draw);

    function draw() {
      requestAnimationFrame(draw);
      ctx.clearRect(0,0,w,h);
      mulv( x, cam.m[0], len );
      mulv( y, cam.m[1], len );
      mulv( z, cam.m[2], len );
      x[1]=-x[1];
      y[1]=-y[1];
      z[1]=-z[1];

      ctx.beginPath();
      if(x[2]>0) ctx.lineWidth = 1; else ctx.lineWidth = 3;
      ctx.moveTo( wc, hc );
      ctx.lineTo( wc+x[0], hc+x[1] );
      ctx.stroke();
      ctx.closePath();

      ctx.beginPath();
      if(y[2]>0) ctx.lineWidth = 1; else ctx.lineWidth = 3;
      ctx.moveTo( wc, hc );
      ctx.lineTo( wc+y[0], hc+y[1] );
      ctx.stroke();
      ctx.closePath();

      ctx.beginPath();
      if(z[2]>0) ctx.lineWidth = 1; else ctx.lineWidth = 3;
      ctx.moveTo( wc, hc );
      ctx.lineTo( wc+z[0], hc+z[1] );
      ctx.stroke();
      ctx.closePath();
    }

  </script>

  <style>
    #demo {
      border: 1px solid;
    }
  </style>

  </div>

</div>

</BODY>
</HTML>