<!DOCTYPE html>
<html>
<head>
<title>Paint en Canvas JS</title>
<style type="text/css">
*{ margin: 0;
padding: 0;
}
canvas{ display: block;
margin: auto;
}
</style>
<script type="text/javascript">
herramienta = "lapiz";
tamano = 15;
pintar = Boolean(false);
color_prim = "#f2f";
color_sec = "#fff";
window.onload = function(){ 'use strict';
var c = document.createElement("canvas"); var ctx = c.getContext("2d");
c.setAttribute("width", window.innerWidth); c.setAttribute("height", window.innerHeight);
document.body.appendChild(c);
c.onmousedown = function (e){ pintar = true;
if( herramienta == "lapiz" ){ ctx.moveTo(e.pageX - c.offsetLeft, e.pageY - c.offsetTop);
}
}
c.onmouseup = function(){ pintar = false;
ctx.beginPath();
}
c.onmousemove = function(e){ if (pintar) { if (herramienta == "lapiz") { ctx.lineTo(e.pageX - c.offsetLeft, e.pageY - c.offsetTop);
ctx.lineWidth = tamano;
ctx.strokeStyle = color_prim;
ctx.stroke();
}
else if(herramienta == "borrador"){ ctx.beginPath();
ctx.clearRect(e.pageX - c.offsetLeft, e.pageY - c.offsetTop,tamano,tamano);
}
}
}
c.onmouseout = function(){ pintar = false;
};
}
</script>
</head>
<body>
<input type="button" name="" value="Borrador" onclick="herramienta='borrador'">
<input type="button" name="" value="Lapiz" onclick="herramienta='lapiz'">
</body>
</html>
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