JuliaPlots/Plots.jl

Polar plots radial axis limits. PGFPlots

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#1,244 opened on Nov 14, 2017

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PGFPlotsXbughelp wanted

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Description

using Plots
pgfplots()
plot(linspace(0, 2pi, 360), linspace(-1, 3, 360), proj = :polar)

polar

The interpretation of axis limits which contain negative numbers is weird instead of the radial axis starting at -1 it starts at 0 and interprets the negative limit as a literal negative radius. This leads to odd looking plots like above. Seems like the main issue for PGFPlots is that it always gives the origin of the polar plot a radius value of 0. Similarly when axis limits do not start at 0 you get

plot(linspace(0, 2pi, 360), linspace(2, 3, 360), proj = :polar)

polarpgfplots

Contributor guide

Research direction
Investigate the PGFPlots backend in the Plots.jl repository, specifically the code handling polar plots and axis limits. Look for how radial axis limits are interpreted and where negative values or non zero origins cause the origin to be fixed at 0. Check the PGFPlots documentation or source for polar coordinate systems. The issue has comments discussing the behavior; read those for context. Potential files to examine: src/backends/pgfplots.jl or similar.
Tech stack
None
Domain
frontend
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.
Half day
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.
Clear
Prerequisites
basic Julia knowledgeunderstanding of Plots.jl
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40