Created
August 19, 2015 07:56
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HTML5 color picker using canvas. Image embedded, no external files
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<html> | |
<body> | |
<canvas id="myCanvas" width="578" height="276"></canvas> | |
<script> | |
function getMousePos(A,t){var a=A.getBoundingClientRect();return{x:t.clientX-a.left,y:t.clientY-a.top}}function drawColorSquare(A,t,a){var d=100,o=A.getContext("2d"),s=(A.width-d+a.width)/2,R=(A.height-d)/2;o.beginPath(),o.fillStyle=t,o.fillRect(s,R,d,d),o.strokeRect(s,R,d,d)}function init(A){var t=10,a=document.getElementById("myCanvas"),d=a.getContext("2d"),i=!1;d.strokeStyle="#444",d.lineWidth=2,a.addEventListener("mousedown",function(){i=!0},!1),a.addEventListener("mouseup",function(o){var n,k,u,y,b,r,e,s=getMousePos(a,o),R=void 0;i&&null!==s&&s.x>t&&s.x<t+A.width&&s.y>t&&s.y<t+A.height&&(n=d.getImageData(t,t,A.width,A.width),k=n.data,u=s.x-t,y=s.y-t,b=k[4*(A.width*y+u)],r=k[4*(A.width*y+u)+1],e=k[4*(A.width*y+u)+2],R="rgb("+b+","+r+","+e+")",drawColorSquare(a,R,A))},!1),d.drawImage(A,t,t),drawColorSquare(a,"white",A)}var imageObj=new Image;imageObj.onload=function(){init(this)},imageObj.src="data:image/jpeg;base64,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"; | |
</script> | |
</body> | |
</html> |
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