How to add percent sign to a label?

Hello. I'm trying to add a text to the plot with the following code

fonts := font.NewCache(liberation.Collection())
plot.DefaultTextHandler = text.Latex{
	Fonts: fonts,
}

labels, err := plotter.NewLabels(plotter.XYLabels{
	XYs: []plotter.XY{
		{X: 0, Y: 0},
	},
	Labels: []string{
		"Money % spent today: 10",
	},
})
if err != nil {
	log.Fatalf("could not create labels: %+v", err)
}

labels.TextStyle[0].Font.Size = 24
labels.TextStyle[0].Color = color.RGBA{B: 255, A: 255}
labels.TextStyle[0].XAlign = draw.XCenter
labels.TextStyle[0].YAlign = draw.YCenter

p.Add(labels)

code was taken from the example https://github.com/gonum/plot/blob/master/text/latex_example_test.go

But I get nothing on the plot except Money. Like % sign cuts everything else.

Could anyone give a hint on how to add a % sign to a string?

This is a LaTeX issue. % is the LaTeX comment mark. Try \\%.

thanks for the quick response. tried \%, %%, \u0025 - does not work.

maybe there is another way to add a multi-line text box to a plot?

Did you try \\%?

yes, github escaped :) tried \\% %% \u0025

@sbinet

I just had a look and it seems the length of the text is the issue. @sbinet will likely have a better understanding of what is going on here.

With the following change, the plot renders no text. One less, and text is present.

diff --git a/text/latex_example_test.go b/text/latex_example_test.go
index 198086e..b88b4cb 100644
--- a/text/latex_example_test.go
+++ b/text/latex_example_test.go
@@ -47,7 +47,7 @@ func ExampleLatex() {
                Labels: []string{
                        `$\frac{\sqrt{x}}{2\pi\Gamma\gamma}$`,
                        `$LaTeX$`,
-                       "plain",
+                       "plaintext, no",
                        `$\frac{\sqrt{x}}{2\beta}$`,
                },
        })

I am away from a real keyboard til end of August. I may have a look before that but no guarantees :)

…

-s Aug 16, 2025 13:31:56 Dan Kortschak ***@***.***>:

[Image]*kortschak* left a comment (gonum/plot#803)[#803 (comment)] I just had a look and it seems the length of the text is the issue. @sbinet[https://github.com/sbinet] will likely have a better understanding of what is going on here. — Reply to this email directly, view it on GitHub[#803 (comment)], or unsubscribe[https://github.com/notifications/unsubscribe-auth/AAIFOSHIHKCTADVDLBHNKH33N4JCJAVCNFSM6AAAAACEBKLTW2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTCOJTGYYDKMRRGA]. You are receiving this because you were mentioned.

apologies for the belated answer.

with the following:

diff --git a/text/latex_example_test.go b/text/latex_example_test.go
index 198086e..b0a02f0 100644
--- a/text/latex_example_test.go
+++ b/text/latex_example_test.go
@@ -46,8 +46,8 @@ func ExampleLatex() {
                },
                Labels: []string{
                        `$\frac{\sqrt{x}}{2\pi\Gamma\gamma}$`,
-                       `$LaTeX$`,
-                       "plain",
+                       `$LaTeX \%$`,
+                       `plain %`,
                        `$\frac{\sqrt{x}}{2\beta}$`,
                },
        })

(ie: use backticks and \% in math-mode.)

I got:

That explains the percent sign, but the longer text still causes all the text to be lost.

this is probably unrelated to any LaTeX issue:

diff --git a/text/latex_example_test.go b/text/latex_example_test.go
index 198086e..156fc4c 100644
--- a/text/latex_example_test.go
+++ b/text/latex_example_test.go
@@ -23,14 +23,20 @@ import (
 
 func ExampleLatex() {
        fonts := font.NewCache(liberation.Collection())
-       plot.DefaultTextHandler = text.Latex{
+       plot.DefaultTextHandler = text.Plain{
                Fonts: fonts,
        }
 
        p := plot.New()
-       p.Title.Text = `$f(x) = \sqrt{\alpha x \Gamma}$`
-       p.X.Label.Text = `$\frac{\sqrt{x}}{2\pi\Gamma\gamma}$`
-       p.Y.Label.Text = `$\beta$`
+       p.Title.Text = `title`
+       p.X.Label.Text = `x`
+       p.Y.Label.Text = `y`
 
        p.X.Min = -1
        p.X.Max = +1
@@ -45,10 +51,14 @@ func ExampleLatex() {
                        {X: +0.5, Y: -0.9},
                },
                Labels: []string{
-                       `$\frac{\sqrt{x}}{2\pi\Gamma\gamma}$`,
-                       `$LaTeX$`,
-                       "plain",
-                       `$\frac{\sqrt{x}}{2\beta}$`,
+                       "1",
+                       "2",
+                       "3333333333",
+                       "4",
                },
        })
        if err != nil {

one more 3 and one gets:

I'd say this comes from a too small Y-axis ?
adding a "5" at {X: +0.5, Y: +100} (as the last label), one gets:

if one adds it as the first label, one gets:

to sum up, I suspect there are possibly 2 bugs:

one in plotter.NewLabels (b/c of the order of the XYLabels matters)
one around plot.Axis

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How to add percent sign to a label? #803

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kortschak commented on Aug 16, 2025

jokaorgua commented on Aug 16, 2025

kortschak commented on Aug 16, 2025

jokaorgua commented on Aug 16, 2025

kortschak commented on Aug 16, 2025

kortschak commented on Aug 16, 2025

sbinet commented on Aug 16, 2025

sbinet commented on Sep 2, 2025

kortschak commented on Sep 2, 2025

sbinet commented on Sep 2, 2025

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