[BUG] Changing default color for charts does not seem to work

Expected Behavior

When using Chart.defaults.global.defaultColor to specify a new default color for all charts, the new default color you specify should overwrite the initial one of 'rgba(0, 0, 0, 0.1)'.

Current Behavior

Specifying a new default color has no effect. The initial one persists.

Possible Solution

Steps to Reproduce (for bugs)

1. Go to live example: https://codepen.io/anon/pen/QvRQgW
2. I have set a new default color of ‘#FF0000’ or red in the JavaScript code, but there is no change on the chart.

Context

I wanted to change the default color of all charts to one that was more suitable to a color scheme I’m using. By changing the global default color once using the line of code suggested in the documentation, the color should automatically affect all charts and save me the trouble of having to manually do it for every chart.

Environment

• Chart.js version: 2.4.0
• Browser name and version: Google Chrome, Version 58.0.3029.110 (64-bit), macOS

[simonbrunel]

@etimberg good catch, we should maybe remove these options from defaults and use the default color if undefined when updating the chart (as we do with many other options).

@gtalarico don’t use Chart.defaults._set because as @etimberg said it’s a private helper that can be removed without notice, so will break your code. Instead, you should use Chart.helpers.merge (fiddle) or simply

[etimberg]

@simonbrunel that would be a good way to fix this. We did something similar around v2.3 or v2.4 for the font options. Doing it for the colours should not be too hard