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vg/vgsvg: add switch to embed fonts to SVG plot
Fixes #703.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| // Copyright ©2021 The Gonum Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
|
|
||
| package vgsvg_test | ||
|
|
||
| import ( | ||
| "log" | ||
| "os" | ||
|
|
||
| lmit "github.com/go-fonts/latin-modern/lmroman10italic" | ||
| lreg "github.com/go-fonts/liberation/liberationserifregular" | ||
| xfnt "golang.org/x/image/font" | ||
| "golang.org/x/image/font/opentype" | ||
|
|
||
| "gonum.org/v1/plot" | ||
| "gonum.org/v1/plot/font" | ||
| "gonum.org/v1/plot/plotter" | ||
| "gonum.org/v1/plot/vg" | ||
| "gonum.org/v1/plot/vg/draw" | ||
| "gonum.org/v1/plot/vg/vgsvg" | ||
| ) | ||
|
|
||
| func Example_embedFonts() { | ||
| // Use Latin-Modern fonts. | ||
| cmi10 := font.Font{Typeface: "Latin-Modern", Style: xfnt.StyleItalic} | ||
| fnt, err := opentype.Parse(lmit.TTF) | ||
| if err != nil { | ||
| log.Fatalf("could not parse Latin-Modern fonts: %+v", err) | ||
| } | ||
|
|
||
| font.DefaultCache.Add([]font.Face{{ | ||
| Font: cmi10, | ||
| Face: fnt, | ||
| }}) | ||
| plot.DefaultFont = cmi10 | ||
|
|
||
| p := plot.New() | ||
| p.Title.Text = "Scatter plot" | ||
| p.X.Label.Text = "x-Axis" | ||
| p.Y.Label.Text = "y-Axis" | ||
|
|
||
| scatter, err := plotter.NewScatter(plotter.XYs{{X: 1, Y: 1}, {X: 0, Y: 1}, {X: 0, Y: 0}}) | ||
| if err != nil { | ||
| log.Fatalf("could not create scatter: %v", err) | ||
| } | ||
| p.Add(scatter) | ||
|
|
||
| c := vgsvg.NewWith( | ||
| vgsvg.UseWH(5*vg.Centimeter, 5*vg.Centimeter), | ||
| vgsvg.EmbedFonts(true), | ||
| ) | ||
| p.Draw(draw.New(c)) | ||
|
|
||
| f, err := os.Create("testdata/embed_fonts.svg") | ||
| if err != nil { | ||
| log.Fatalf("could not create output SVG file: %+v", err) | ||
| } | ||
| defer f.Close() | ||
|
|
||
| _, err = c.WriteTo(f) | ||
| if err != nil { | ||
| log.Fatalf("could not write output SVG plot: %+v", err) | ||
| } | ||
|
|
||
| err = f.Close() | ||
| if err != nil { | ||
| log.Fatalf("could not close output SVG file: %v", err) | ||
| } | ||
| } | ||
|
|
||
| func Example_standardFonts() { | ||
| // Use standard fonts. | ||
| tms := font.Font{Typeface: "Times"} | ||
| fnt, err := opentype.Parse(lreg.TTF) | ||
| if err != nil { | ||
| log.Fatalf("could not parse Times fonts: %+v", err) | ||
| } | ||
|
|
||
| font.DefaultCache.Add([]font.Face{{ | ||
| Font: tms, | ||
| Face: fnt, | ||
| }}) | ||
| plot.DefaultFont = tms | ||
|
|
||
| p := plot.New() | ||
| p.Title.Text = "Scatter plot" | ||
| p.X.Label.Text = "x-Axis" | ||
| p.Y.Label.Text = "y-Axis" | ||
|
|
||
| scatter, err := plotter.NewScatter(plotter.XYs{{X: 1, Y: 1}, {X: 0, Y: 1}, {X: 0, Y: 0}}) | ||
| if err != nil { | ||
| log.Fatalf("could not create scatter: %v", err) | ||
| } | ||
| p.Add(scatter) | ||
|
|
||
| err = p.Save(5*vg.Centimeter, 5*vg.Centimeter, "testdata/standard_fonts.svg") | ||
| if err != nil { | ||
| log.Fatalf("could not save SVG plot: %+v", err) | ||
| } | ||
| } |
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