imaNNeo/fl_chart

Setting minY for Line Chart Causes Rendering outside of Container

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#870 opened on Jan 6, 2022

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Line Chartenhancementgood first issue

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Description

Describe the bug Structurally, I have a LineChart within a Container that's used to constrain the chart's dimensions. When supplying a minY to LineChartData, the chart display extends outside the bounds of the Container. Normally, I would expect the chart to scale to the size of the container in all cases.

To Reproduce

Code snippet:

The y values supplied range between 35,000 to 65,000

Screenshots

Without specifying a minY:

Specifying a minY:

Versions

  • which version of the Flutter are you using? 2.5.3
  • which version of the FlChart are you using? 0.40.6

Contributor guide

Research direction
Investigate the LineChartData rendering logic when minY is set, focusing on how the graph bounds are computed and how the chart scales within its container. Check for any misalignment in coordinate transformation.
Tech stack
dartflutter
Domain
frontend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Flutter
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70