Add line of best fit, update chart.js, fix issues

[Wemmy0]

Fixes #54 Adds enhancement #65

USAGE:

1. Add bestFit: true (optional) to the chart code
2. Add bestFitTitle: "Your Title" (Optional) to the chart code to change the generated line title
3. Add bestFitNumber: (Optional) to the chart code to specify which line should be used to create the line of best fit

Other changes:

• Updates chart.js for much better performance and hybrid charts (not implemented yet)

How it works:

• Uses the linear regression method to create the equation of the line
• Then using the Y values and the equation of the line, to form points for the line of best fit
• Then append a new line to the chart data which is passed on to the normal chart renderer

Example:

type: line
labels: [0.3,0.4,0.5,0.6,0.7,0.8,0.9,1]
series:
  - title: 
    data: [0.0137, 0.0189, 0.0217, 0.0239, 0.03, 0.033, 0.0371, 0.0446]
  - title: 
    data: [0, 0.001, 0.002]
width: 100%
beginAtZero: false
xTitle: "Length /cm"
yTitle: "1/f"
bestFit: true
bestFitTitle: "LOBF"
bestFitNumber: 1

Forms:

If bestFitTitle or bestFitNumber aren't defined, they default to the values Line of Best Fit and 0 respectively With default values:

The PDF exporting issue was fixed by passing through the setting animation duration 0 to chart.js to disable the animation.

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[phibr0]

Looks good, but it seems like you changed the codeblock type for the advanced-chart. This will break exisiting codeblocks by other users. can you change it back?

[Wemmy0]

Yep sorry changing it back now

[Wemmy0]

obsidian-charts.zip That's the one with the correct manifest.json file

[phibr0]

Thanks a lot for your improvements!