Canvas drawings, like lines, are blurry

Question

I have a

and canvas, which is drawn using:

context.lineWidth = 1;
context.strokeStyle = \"gray\         


        

Answer 1

As @langpavel mentioned in a comment, the Mozilla website has example code for how to correct resolution in a canvas: https://developer.mozilla.org/en-US/docs/Web/API/Window/devicePixelRatio

var canvas = document.getElementById('canvas');

var ctx = canvas.getContext('2d');

// Set display size (css pixels).
var size = 200;
canvas.style.width = size + "px";
canvas.style.height = size + "px";

// Set actual size in memory (scaled to account for extra pixel density).
var scale = window.devicePixelRatio; // Change to 1 on retina screens to see blurry canvas.
canvas.width = size * scale;
canvas.height = size * scale;

// Normalize coordinate system to use css pixels.
ctx.scale(scale, scale);

ctx.fillStyle = "#bada55";
ctx.fillRect(10, 10, 300, 300);
ctx.fillStyle = "#ffffff";
ctx.font = '18px Arial';
ctx.textAlign = 'center';
ctx.textBaseline = 'middle';

var x = size / 2;
var y = size / 2;

var textString = "I love MDN";
ctx.fillText(textString, x, y);