entriesForXValue() not finding point with matching xValue when it should

[darbysauter]

• [x ] I've read, understood, and done my best to follow the *CONTRIBUTING guidelines.

What did you do?

Tapped a point on my LineChart

What did you expect to happen?

Highlight a point

What happened instead?

Failed to highlight point

Charts Environment

Charts version/Branch/Commit Number:master
Xcode version:Latest
Swift version:Latest
Platform(s) running Charts:iPhoneX
macOS version running Xcode:BigSur

Demo Project

Unable to produce

Reason for this to happen

In entriesForXValue(_ xValue: Double) -> [ChartDataEntry] of ChartDataSet
it uses partitioningIndex() to find the first index that matches the xValue.

The xValue is from:
closest = set.entryForXValue(xValue, closestToY: .nan, rounding: rounding)

Which I have verified is working properly:

As you can see xValue matches the x value of the entry at index 3. using firstIndex() also produces index 3, but partitioningIndex() returns the the index after the last of entries.

So to debug this, after the case where it could not find the index I manually check every entry and Int round them, If I find a match I then test firstIndex() using the same predicate as partitioningIndex() (so no Int rounding), and this works.

partitioningIndex() does work sometimes but I couldn't figure out a common cause.

Assuming my assumption that partitioningIndex() and firstIndex() should do the same thing then partitioningIndex() is broken.

Any ideas how to properly fix this? for the meantime I may just use firstIndex() on my fork.

[ggorlim]

I have same issue, so as workaround i rewrite method entriesForXValue, using code from older lib version:

override func entriesForXValue(_ xValue: Double) -> [ChartDataEntry]
{
var entries = ChartDataEntry
var low = startIndex
var high = endIndex - 1
while low <= high...

This work, but we have some other issues, i m not think they are related to this, like rendering only first from multiple graphs..

I think this issue also have same problem : #4645 Markers not appearing as expected

[lancelot9527]

I have same issue, so as workaround i rewrite method entriesForXValue, using code from older lib version:

override func entriesForXValue(_ xValue: Double) -> [ChartDataEntry]
{
var entries = ChartDataEntry
var low = startIndex
var high = endIndex - 1
while low <= high...

This work, but we have some other issues, i m not think they are related to this, like rendering only first from multiple graphs..

I think this issue also have same problem : #4645 Markers not appearing as expected

It work,thanks
I use 3.6.0 version fix this problem

[logancautrell]

I can confirm that 3.6.0 fixes the selection issue. 4.0.1 version is busted.

[dudenamedjune]

Have a fix open for this #4817
#4719 (comment)

[pmairoldi]

Closed by #4721