As a beginner in web scripting, I am interested in finding a JavaScript or jQuery plug-in that can crop an image into custom provided dimensions, specifically in the shape of a hexagon (see attached image). Ideally, I would prefer the cropping to be achieved through CSS, but I am open to using any JS or jQuery plugin if necessary.
Below is the code snippet that aims to fulfill your requested function:
function polygonalCrop(options) {
function merge(a, b){
b=b||{};
for(var key in b)
if(b.hasOwnProperty(key))
a[key] = b[key];
return a;
}
options=merge({
url:null,
sides:8,
angle:0,
centerX:null,
centerY:null,
radius:null,
outlineColor:null,
outlineThickness:null,
success:function(url){},
fail:function(ev){}
},options);
if (!options.url) throw 'options needs an image URL as url property';
var img=new Image();
img.setAttribute('crossOrigin', 'anonymous');
img.onload=function() {
var w=this.width;
var h=this.height;
var canvas=document.createElement('canvas');
canvas.width=w;
canvas.height=h;
var ctx=canvas.getContext('2d');
if (options.centerX===null) {
options.centerX=w/2;
}
if (options.centerY===null) {
options.centerY=h/2;
}
var ang=2*Math.PI/options.sides;
var len=Math.sin(ang/2)*2;
if (options.radius===null) {
options.radius=Math.min(w/2,h/2)*Math.cos(ang/2);
}
ctx.translate(options.centerX,options.centerY);
ctx.rotate(options.angle);
if (options.outlineThickness) ctx.lineWidth=options.outlineThickness;
if (options.outlineColor) ctx.strokeStyle=options.outlineColor;
ctx.moveTo(-len/2,-options.radius);
for (var i=0; i<2*Math.PI; i+=ang) {
ctx.rotate(ang);
ctx.lineTo(len/2,-options.radius);
}
ctx.closePath();
if (options.outlineThickness && options.outlineColor) ctx.stroke();
ctx.clip();
ctx.rotate(2*Math.PI-i-options.angle);
ctx.translate(-options.centerX,-options.centerY);
ctx.drawImage(this,0,0);
options.success(ctx.canvas.toDataURL());
};
img.onerror=function() { alert('there was an error loading the image'); };
img.src=options.url;
}
This function takes the provided URL and crop dimensions to generate a cropped image data URL. You can view it live here: https://jsfiddle.net/psrec1b5/2/
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