Tick label is cropped when using Chinese font.

[AllenDang]

What are you trying to do?

Set the plot.DefualtFont to a Chinese font and tick in x-axis should be displayed completely.

What did you do?

Set font to /System/Library/Fonts/STHeiti Light.ttc

        fontData, err := ioutil.ReadFile(fontPath)
	if err != nil {
		panic(err)
	}

	font, err := truetype.Parse(fontData)
	if err != nil {
		panic(err)
	}

	fontName := "font"
	vg.AddFont(fontName, font)
	plot.DefaultFont = fontName
	plotter.DefaultFont = fontName

What did you expect to happen?

Tick should be displayed completely.

What actually happened?

Tick label is cropped.

What version of Go and Gonum/plot are you using?

go version go1.13.5 darwin/amd64
gonum/plog version: ca91d9d

Does this issue reproduce with the current master?

Yes

[kortschak]

Can you please provide a complete reproducer and link to the font file.

[AllenDang]

@kortschak
Here is a minimal reproducer.

package main

import (
	"io/ioutil"
	"math/rand"

	"github.com/golang/freetype/truetype"
	"gonum.org/v1/plot"
	"gonum.org/v1/plot/plotter"
	"gonum.org/v1/plot/vg"
)

func main() {
	fontPath := "/System/Library/Fonts/STHeiti Light.ttc"
	fontData, err := ioutil.ReadFile(fontPath)
	if err != nil {
		panic(err)
	}

	font, err := truetype.Parse(fontData)
	if err != nil {
		panic(err)
	}

	fontName := "font"
	vg.AddFont(fontName, font)
	plot.DefaultFont = fontName
	plotter.DefaultFont = fontName

	data := make(plotter.XYs, 10)
	for i := range data {
		data[i].X = float64(i)
		data[i].Y = float64(rand.Intn(10))
	}
	p, _ := plot.New()

	l, _ := plotter.NewLine(data)

	p.Add(l)

	p.Save(400, 200, "output.png")
}

Here is the font link.
STHeiti

[sbinet]

this was fixed w/ a51a196
(ie: #642)