Themes

goplotlib ships with four carefully designed themes. Pass a theme to plot.WithTheme(t) when creating a Figure:

import (
	"github.com/goplotlib/goplotlib/plot"
	"github.com/goplotlib/goplotlib/theme"
)

fig := plot.New(
	plot.WithWidth(860),
	plot.WithHeight(420),
	plot.WithTheme(theme.Dark),
)

Light (default)

Clean white background with a light grey plot area. Left and bottom spines are shown. Uses the Classic palette — saturated but not garish. Good for reports, notebooks, and light-mode UIs.

package main

import (
	"math"

	"github.com/goplotlib/goplotlib/chart"
	"github.com/goplotlib/goplotlib/plot"
	"github.com/goplotlib/goplotlib/theme"
)

func main() {
	fig := plot.New(plot.WithWidth(700), plot.WithHeight(350), plot.WithTheme(theme.Light))
	ax := fig.AddAxes()
	ax.Line(xs, ys1, chart.LineStyle{Label: "series A", Smooth: true, Fill: true, LineWidth: 2.5})
	ax.Line(xs, ys2, chart.LineStyle{Label: "series B", Smooth: true, LineWidth: 2.5})
	ax.SetTitle("Theme Showcase").SetXLabel("x").SetYLabel("y")
}

Light theme

Dark

Deep navy background, matching plot area. Grid lines are subtle dark-blue stripes. Text and tick labels use a soft lavender tone. Pairs well with dashboards and dark-mode applications. Also uses the Classic palette.

package main

import (
	"math"

	"github.com/goplotlib/goplotlib/chart"
	"github.com/goplotlib/goplotlib/plot"
	"github.com/goplotlib/goplotlib/theme"
)

func main() {
	fig := plot.New(plot.WithWidth(700), plot.WithHeight(350), plot.WithTheme(theme.Dark))
	ax := fig.AddAxes()
	ax.Line(xs, ys1, chart.LineStyle{Label: "series A", Smooth: true, Fill: true, LineWidth: 2.5})
	ax.Line(xs, ys2, chart.LineStyle{Label: "series B", Smooth: true, LineWidth: 2.5})
	ax.SetTitle("Theme Showcase").SetXLabel("x").SetYLabel("y")
}

Dark theme

Minimal

White background and plot area, no left spine — just a bottom spine. Grid lines are dashed and very light. Produces clean, presentation-style charts with minimal visual noise. Uses the Classic palette.

package main

import (
	"math"

	"github.com/goplotlib/goplotlib/chart"
	"github.com/goplotlib/goplotlib/plot"
	"github.com/goplotlib/goplotlib/theme"
)

func main() {
	fig := plot.New(plot.WithWidth(700), plot.WithHeight(350), plot.WithTheme(theme.Minimal))
	ax := fig.AddAxes()
	ax.Line(xs, ys1, chart.LineStyle{Label: "series A", Smooth: true, Fill: true, LineWidth: 2.5})
	ax.Line(xs, ys2, chart.LineStyle{Label: "series B", Smooth: true, LineWidth: 2.5})
	ax.SetTitle("Theme Showcase").SetXLabel("x").SetYLabel("y")
}

Minimal theme

FiveThirtyEight

Inspired by the data journalism style of FiveThirtyEight. Grey background, bold white grid lines (no spines), larger title font. Uses the FTEPalette — bright, high-contrast colours that read well at small sizes.

package main

import (
	"math"

	"github.com/goplotlib/goplotlib/chart"
	"github.com/goplotlib/goplotlib/plot"
	"github.com/goplotlib/goplotlib/theme"
)

func main() {
	fig := plot.New(plot.WithWidth(700), plot.WithHeight(350), plot.WithTheme(theme.FiveThirtyEight))
	ax := fig.AddAxes()
	ax.Line(xs, ys1, chart.LineStyle{Label: "series A", Smooth: true, Fill: true, LineWidth: 2.5})
	ax.Line(xs, ys2, chart.LineStyle{Label: "series B", Smooth: true, LineWidth: 2.5})
	ax.SetTitle("Theme Showcase").SetXLabel("x").SetYLabel("y")
}

FiveThirtyEight theme

Palette colors

Palette	Colors
Classic (Light, Dark, Minimal)	`#4C72B0` `#DD8452` `#55A868` `#C44E52` `#8172B3` `#937860` `#DA8BC3` `#8C8C8C` `#CCB974` `#64B5CD`
FTEPalette (FiveThirtyEight)	`#008fd5` `#fc4f30` `#e5ae38` `#6d904f` `#8b8b8b` `#810f7c`

You can override any series color by setting the Color field in the chart’s style struct:

ax.Line(xs, ys, chart.LineStyle{Color: color.Parse("#hex")})