@netdata/charts/dist/es6/helpers/canvas/index.js

Netdata frontend SDK and chart utilities

export var createCanvas = function createCanvas(width, height) {
  var backgroundCanvas = document.createElement("canvas");
  backgroundCanvas.width = width;
  backgroundCanvas.height = height;
  return backgroundCanvas;
};
export var copyCanvas = function copyCanvas(sourceCanvas, targetCanvas) {
  targetCanvas.width = sourceCanvas.width;
  targetCanvas.height = sourceCanvas.height;
  var ctx = targetCanvas.getContext("2d");
  ctx.clearRect(0, 0, targetCanvas.width, targetCanvas.height);
  ctx.drawImage(sourceCanvas, 0, 0);
};
var measureContext;
var getMeasureContext = function getMeasureContext() {
  if (typeof document === "undefined") return null;
  if (typeof navigator !== "undefined" && /jsdom/i.test(navigator.userAgent)) return null;
  try {
    if (!measureContext) measureContext = document.createElement("canvas").getContext("2d");
  } catch (_unused) {
    return null;
  }
  return measureContext;
};
export var measureTextWidth = function measureTextWidth(text, font) {
  var context = getMeasureContext();
  if (!context) return null;
  if (font) context.font = font;
  return context.measureText(text || "").width;
};