Issue tooltips (2.0.0-beta)

[takissp]

Hello,
i have found two issues related with the tooltips:

1. the alpha on backgroundColor has no effect
2. the category color (the fill color of the rectangle) is not always correct. it seems that the code use a different color for the category if you mouseover the border of the point or inside the point area.

[etimberg]

@takissp the first is definitely an issue. In the second I think you are talking about the hover styling when you mouseover a point. You can disable the hover styling by setting the following in your chart config

hover: {
    mode: false
}

[takissp]

Thanks for the suggestion. But doing that completely remove the hover effect on the points, doesn't solve the issue of the different fill colors. If the hover is enabled the fill color must be always the same.

In attachment the file i use to test the various aspects of chartjs.
graph.zip

[hamalaiv]

I have made a jsfiddle to demonstrate the issues: https://jsfiddle.net/hamalainen/oxfhmby3/

The alpha indeed does not have an effect on the tooltip background. But as you can see the point colors can be changed for the hover effect.

[etimberg]

@hamalaiv's fiddle show's how to change the hover color. If one is not provided, we default to a version close to the fill color. There is already an open issue to allow globally setting the hover colors.

[etimberg]

Fixed opacity in #2057