Fix positions of Line View

[yeahsilver]

when I used the Line View, the position is quite different from the actual value, so I've made up the decision to fix this part

Description

Your own project be like

As you seen. the graph above has the gap btw the actual value and the guide line of this chart view ( I don't know whether you intended to or not)

I had a little trouble of using it, so I'd suggest you to see what I did in my repo.

What I fixed is like,

But when I had fixed only this part, the chart had not worked well

Hence, I fixed a bit of MagnifierRectangle like this

That's all what I fixed!

Consider you guys to fix it.
if not, I just wish that I would help others who would have trouble of doing it.

Motivation and Context

As I wrote above, the actual value and the visual graph is little different. I want to match up the actual value and the guide line of the chart, so I request you!

How Has This Been Tested?

About 1 week

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Non-functional change (Updating Documentation, CI automation, etc..)

Checklist:

• [x ] My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.