Julian Dimitrov
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For the past few days, I'm struggling with one Chart.js chart that I want to clip or mask with custom vector path. I was able to do something like what I want, but I think I'm missing something. The approach that I took is to create the chart in html (the traditional way, with html canvas ..etc) and then create a svg with the shape I want to cut off and then overlay the <canvas> and <svg> elements. This is what I was able to accomplish: js: var config = { type: 'line', data: { labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'], datasets: [{ label: 'My First dataset', fill: false, borderColor: "red", backgroundColor: "red", data: [ {x:23,y:57}, {x:43,y:67}, {x:143,y:167} ] }, { label: 'My Second dataset ', fill: false, borderColor: "blue", backgroundColor: "blue", data: [ {x:12,y:76}, {x:23,y:89}, {x:143,y:167} ] }] }, options: { title: { display: false, text: 'Chart.js Line Chart' } } }; window.onload = function () { var ctx = document.getElementById('canvas').getContext('2d'); window.myLine = new Chart(ctx, config); }; css: canvas { position: absolute; z-index: 0; } svg { position: absolute; z-index: 1; } body { background-color: white; } html: <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script> <head> <title> My cutoff chart </title> </head> <body> <canvas id="canvas"></canvas> <svg viewBox="0 0 200 100" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"> <defs> <style> #clickHandler { pointer-events: all; } </style> <path id="ship" d="m 100.09542,69.20104 h -83.5475 v -0.41351 -0.41351 l -0.595313,0.0828 -0.595312,0.0828 -0.01659,-0.66146 -0.01659,-0.66146 -0.380288,0.12526 -0.380288,0.12526 -1.890519,0.007 -1.890518,0.007 -0.556877,-0.50403 -0.556878,-0.50403 v -0.38141 -0.38142 l 1.06532,-1.21026 1.065319,-1.21027 -0.09501,-0.28554 -0.09501,-0.28554 -1.433331,-0.20539 -1.433331,-0.20539 -0.859896,-0.13733 -0.859896,-0.13733 v -0.38353 -0.38353 l -1.220114,-0.57352 -1.220114,-0.57352 -0.737049,-1.01747 -0.73705,-1.01747 -0.8116695,-2.57755 -0.8116695,-2.57756 -0.3901093,-1.98437 -0.3901092,-1.98438 -0.1825245,-1.65364 -0.1825245,-1.65365 h 1.5141537 1.5141538 l 0.132161,-0.50538 0.132161,-0.50539 2.753486,-0.18768 2.753485,-0.18767 v -0.35283 -0.35282 l 0.307053,-0.6739 0.307053,-0.67391 h 1.904977 1.904977 l 1.193236,-0.16355 1.193236,-0.16355 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1.91823,0.0305 1.91823,0.0305 v 0.42473 0.42473 l 4.16719,-0.17789 4.16719,-0.17789 1.51081,-0.27919 1.51082,-0.27919 0.40741,0.15633 0.40741,0.15634 v 0.48438 0.48438 l -2.40439,2.50049 -2.4044,2.50049 -1.84101,2.24895 -1.841,2.24896 -1.31085,2.60364 -1.31085,2.60364 v 0.63751 0.6375 l 0.8599,0.0355 0.8599,0.0355 1.05833,-0.0538 1.05833,-0.0538 0.92604,0.63314 0.92605,0.63314 -0.0719,0.87537 -0.0719,0.87537 -0.45725,0.7761 -0.45726,0.77609 -1.35008,0.89689 -1.35008,0.89688 -1.9519,0.5409 -1.95188,0.5409 z m 33.00145,-39.6875 h 0.1323 v -0.13229 -0.13229 h -0.1323 -0.13229 v 0.13229 0.13229 z m 20.54212,-7.82802 0.22768,-0.14071 v -0.24897 -0.24897 h -0.39688 -0.39687 v 0.22049 0.22049 l 0.16919,0.16919 0.1692,0.1692 z" /> <rect id="bg" x="-1%" y="-1%" width="102%" height="102%"/> <mask id="myMask"> <use xlink:href="#bg" fill="white"/> <use xlink:href="#ship" fill="black" /> </mask> </defs> <use xlink:href="#bg" mask="url(#myMask)" fill="chocolate" fill-opacity="0.5"/> <use xlink:href="#ship" fill="none" id="clickHandler" style="fill:none; stroke-width:0.264583;stroke:black;"/> </svg> </body> Here is a working code pen. So far so good, but I wasn't able to align the chart and the cutout properly. The desired position of the visible part of the chart is inside the blue rectangle: As I said, I'm not sure that I took the best approach for achieving this effect. And to be honest, my knowledge in front-end development and graphical design (using .svg files) are very basic. Any help will be greatly appreciated Thanks in advance, Julian
