From: Marcel Samyn <dev@mrcl.io>
Date: Mon, 18 Jan 2021 13:59:13 +0000 (+0100)
Subject: fix canvas clearRect size calculation (#8328)
X-Git-Tag: v3.0.0-beta.10~13
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ff19ea4be7f5e48f5671eebcb00c8b428a9824db;p=thirdparty%2FChart.js.git

fix canvas clearRect size calculation (#8328)

Co-authored-by: Marcel Samyn <marcel.samyn@lab900.com>
---

diff --git a/src/helpers/helpers.canvas.js b/src/helpers/helpers.canvas.js
index 064c5e9c4..25fcfc4bf 100644
--- a/src/helpers/helpers.canvas.js
+++ b/src/helpers/helpers.canvas.js
@@ -113,7 +113,13 @@ export function _alignPixel(chart, pixel, width) {
  */
 export function clearCanvas(canvas, ctx) {
 	ctx = ctx || canvas.getContext('2d');
+
+	ctx.save();
+	// canvas.width and canvas.height do not consider the canvas transform,
+	// while clearRect does
+	ctx.resetTransform();
 	ctx.clearRect(0, 0, canvas.width, canvas.height);
+	ctx.restore();
 }
 
 export function drawPoint(ctx, options, x, y) {