ChartsOrg/Charts

Combined chart bar width inconsistency (Bar chart width 1.0 will have thin space between bars)

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#2,765 opened on Sep 1, 2017

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help wanted

Description

Using combined chart view I'm trying to display semi transparent bar data with no spacing between the bars, but I'm getting some unexpected behaviour: setting the barWidth of the set to 1.005 gets me chart with bars that start with spacing between them, towards the middle gets perfect and towards the end bars start to overlap and which results of a solid color - a combination of the 2 semi transparent. gh5i4cp

Running the same code on smaller screens gets me spacing and on bigger screen - overlap.

Contributor guide

Tech stack
swift
Domain
mobile
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
needs investigation
Prerequisites
SwiftUIKit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Investigate the bar width calculation in CombinedChartView. The issue suggests that setting barWidth to 1.005 causes inconsistent spacing on different screen sizes. Look for pixel scaling or rounding issues in the rendering code, possibly in BarChartRenderer or CombinedChartRenderer. Check comments and related issues for any known fixes or discussions about bar width and screen density.
Combined chart bar width inconsistency (Bar chart width 1.0 will have thin space between bars) · ChartsOrg/Charts#2765 | Good First Issue