<!DOCTYPE html>

<html>

<head>

<meta name="viewport" content="width=device-width, initial-scale=1.0">

<meta charset="utf-8">

<title>Drawing with text</title>

<meta name="keywords" content="geovindu">

<meta name="description" content="涂聚文">

<meta name="author" content="Tim Holman">

<style type="text/css">

@import "compass/css3";

html, body {

  width: 100%;

  height: 100%;

  margin: 0px;

  overflow: hidden;

    &:hover {

   span {

      display: none;

    }

  }

}

canvas {

 cursor: crosshair;

}

span {

    font-family: 'Georgia', cursive;

  font-size: 40px;

 position: fixed;

  top: 50%;

  left: 50%;

  color: #000;

  margin-top: -40px;

  margin-left: -200px;

}

</style>

</head>

<body>

<canvas id='canvas'></canvas>

<span id='info'>Click and drag to draw!<span>

<!--

  Drawing with text:

  -  Click and drag to draw.

  -  Double click to clear.

  Ported from java at http://www.generative-gestaltung.de

  by Tim Holman - @twholman

-->

<script type="text/javascript">

//A PEN BY Tim Holman

//https://onaircode.com/awesome-html5-canvas-examples-source-code/

// Drawing with text. Ported from Generative Design book - http://www.generative-gestaltung.de - Original licence: http://www.apache.org/licenses/LICENSE-2.0

// Application variables

var position = {x: 0, y: window.innerHeight/2};

var counter = 0;

var minFontSize = 3;

var angleDistortion = 0;

var letters = "中国人民解放了！中国人站起来了！涂聚文(Geovin Du),明者因事而变，知者随事而制！--《盐铁论》。There was a table set out under a tree in front of the house, and the March Hare and the Hatter were having tea at it: a Dormouse was sitting between them, fast asleep, and the other two were using it as a cushion, resting their elbows on it, and talking over its head. 'Very uncomfortable for the Dormouse,' thought Alice; 'only, as it's asleep, I suppose it doesn't mind.'";

// Drawing variables

var canvas;

var context;

var mouse = {x: 0, y: 0, down: false}

function init() {

  canvas = document.getElementById( 'canvas' );

  context = canvas.getContext( '2d' );

  canvas.width = window.innerWidth;

  canvas.height = window.innerHeight;

  canvas.addEventListener('mousemove', mouseMove, false);

  canvas.addEventListener('mousedown', mouseDown, false);

  canvas.addEventListener('mouseup',   mouseUp,   false);

  canvas.addEventListener('mouseout',  mouseUp,  false);

  canvas.addEventListener('dblclick', doubleClick, false);

  window.onresize = function(event) {

    canvas.width = window.innerWidth;

    canvas.height = window.innerHeight;

  }

}

function mouseMove ( event ){

  mouse.x = event.pageX;

  mouse.y = event.pageY;

  draw();

}

function draw() {

 if ( mouse.down ) {

    var d = distance( position, mouse );

    var fontSize = minFontSize + d/2;

    var letter = letters[counter];

    var stepSize = textWidth( letter, fontSize );

    if (d > stepSize) {

      var angle = Math.atan2(mouse.y-position.y, mouse.x-position.x);

      context.font = fontSize + "px Georgia";

      context.save();

      context.translate( position.x, position.y);

      context.rotate( angle );

      context.fillText(letter,0,0);

      context.restore();

      counter++;

      if (counter > letters.length-1) {

        counter = 0;

      }

    //console.log (position.x + Math.cos( angle ) * stepSize)

      position.x = position.x + Math.cos(angle) * stepSize;

      position.y = position.y + Math.sin(angle) * stepSize;

      }

  }

}

function distance( pt, pt2 ){

  var xs = 0;

  var ys = 0;

  xs = pt2.x - pt.x;

  xs = xs * xs;

  ys = pt2.y - pt.y;

  ys = ys * ys;

  return Math.sqrt( xs + ys );

}

function mouseDown( event ){

  mouse.down = true;

  position.x = event.pageX;

  position.y = event.pageY;

  document.getElementById('info').style.display = 'none';

}

function mouseUp( event ){

    mouse.down = false;

}

function doubleClick( event ) {

  canvas.width = canvas.width;

}

function textWidth( string, size ) {

  context.font = size + "px Georgia";

  if ( context.fillText ) {

    return context.measureText( string ).width;

  } else if ( context.mozDrawText) {

    return context.mozMeasureText( string );

  }

 };

init();

</script>

</body>

</html>

　　

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