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Dibujar a mano alzada #3*

A Pen By Gabi Pro

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HTML

            
              
<canvas id="canvas">Su navegador no soporta canvas :( </canvas>
<p id="limpiar">limpiar canvas</p>
!

CSS

            
              $body-bg :  #eee;
$canvas-bg: #fff;
$font1 : Arial, sans-serif;

body{
  background-color: $body-bg;
  font-family:$font1;
}

canvas {
  display: block;
  margin: 0 auto;
  margin: calc(50vh - 150px) auto 0;
  background: $canvas-bg;
  border-radius: 3px;
  box-shadow: 0px 0px 15px 3px #ccc;
  cursor:pointer;
}
p{
  text-align:center;
  cursor:pointer;
}
!

JS

            
              var limpiar = document.getElementById("limpiar");
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var cw = canvas.width = 300,
  cx = cw / 2;
var ch = canvas.height = 300,
  cy = ch / 2;

var dibujar = false;
var factorDeAlisamiento = 5;
var Trazados = [];
var puntos = [];
ctx.lineJoin = "round";

limpiar.addEventListener('click', function(evt) {
  dibujar = false;
  ctx.clearRect(0, 0, cw, ch);
  Trazados.length = 0;
  puntos.length = 0;
}, false);


canvas.addEventListener('mousedown', function(evt) {
  dibujar = true;
  //ctx.clearRect(0, 0, cw, ch);
  puntos.length = 0;
  ctx.beginPath();

}, false);

canvas.addEventListener('mouseup', function(evt) {
  redibujarTrazados();
}, false);

canvas.addEventListener("mouseout", function(evt) {
  redibujarTrazados();
}, false);

canvas.addEventListener("mousemove", function(evt) {
  if (dibujar) {
    var m = oMousePos(canvas, evt);
    puntos.push(m);
    ctx.lineTo(m.x, m.y);
    ctx.stroke();
  }
}, false);





function reducirArray(n,elArray) {
  var nuevoArray = [];
  nuevoArray[0] = elArray[0];
  for (var i = 0; i < elArray.length; i++) {
    if (i % n == 0) {
      nuevoArray[nuevoArray.length] = elArray[i];
    }
  }
  nuevoArray[nuevoArray.length - 1] = elArray[elArray.length - 1];
  Trazados.push(nuevoArray);
}

function calcularPuntoDeControl(ry, a, b) {
  var pc = {}
  pc.x = (ry[a].x + ry[b].x) / 2;
  pc.y = (ry[a].y + ry[b].y) / 2;
  return pc;
}

function alisarTrazado(ry) {
  if (ry.length > 1) {
    var ultimoPunto = ry.length - 1;
    ctx.beginPath();
    ctx.moveTo(ry[0].x, ry[0].y);
    for (i = 1; i < ry.length - 2; i++) {
      var pc = calcularPuntoDeControl(ry, i, i + 1);
      ctx.quadraticCurveTo(ry[i].x, ry[i].y, pc.x, pc.y);
    }
    ctx.quadraticCurveTo(ry[ultimoPunto - 1].x, ry[ultimoPunto - 1].y, ry[ultimoPunto].x, ry[ultimoPunto].y);
    ctx.stroke();
  }
}


function redibujarTrazados(){
  dibujar = false;
  ctx.clearRect(0, 0, cw, ch);
  reducirArray(factorDeAlisamiento,puntos);
  for(var i = 0; i < Trazados.length; i++)
  alisarTrazado(Trazados[i]);
}

function oMousePos(canvas, evt) {
  var ClientRect = canvas.getBoundingClientRect();
  return { //objeto
    x: Math.round(evt.clientX - ClientRect.left),
    y: Math.round(evt.clientY - ClientRect.top)
  }
}
!
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