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// Copyright ©2018 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 vgpdf_test
import (
"fmt"
"image/color"
"log"
"os"
"gonum.org/v1/plot"
"gonum.org/v1/plot/plotter"
"gonum.org/v1/plot/vg"
"gonum.org/v1/plot/vg/draw"
"gonum.org/v1/plot/vg/vgpdf"
)
// Example_embedFonts shows how one can embed (or not) fonts inside
// a PDF plot.
func Example_embedFonts() {
p, err := plot.New()
if err != nil {
log.Fatalf("could not create plot: %v", err)
}
pts := plotter.XYs{{X: 0, Y: 0}, {X: 0, Y: 1}, {X: 1, Y: 0}, {X: 1, Y: 1}}
line, err := plotter.NewLine(pts)
if err != nil {
log.Fatalf("could not create line: %v", err)
}
p.Add(line)
p.X.Label.Text = "X axis"
p.Y.Label.Text = "Y axis"
c := vgpdf.New(100, 100)
// enable/disable embedding fonts
c.EmbedFonts(true)
p.Draw(draw.New(c))
f, err := os.Create("testdata/enable-embedded-fonts.pdf")
if err != nil {
log.Fatal(err)
}
defer f.Close()
_, err = c.WriteTo(f)
if err != nil {
log.Fatalf("could not write canvas: %v", err)
}
err = f.Close()
if err != nil {
log.Fatalf("could not save canvas: %v", err)
}
}
// Example_multipage shows how one can create a PDF with multiple pages.
func Example_multipage() {
c := vgpdf.New(5*vg.Centimeter, 5*vg.Centimeter)
for i, col := range []color.RGBA{{B: 255, A: 255}, {R: 255, A: 255}} {
if i > 0 {
// Add a new page.
c.NextPage()
}
p, err := plot.New()
if err != nil {
log.Fatalf("could not create plot: %v", err)
}
pts := plotter.XYs{{X: 0, Y: 0}, {X: 0, Y: 1}, {X: 1, Y: 0}, {X: 1, Y: 1}}
line, err := plotter.NewLine(pts)
if err != nil {
log.Fatalf("could not create line: %v", err)
}
line.Color = col
p.Add(line)
p.Title.Text = fmt.Sprintf("Plot %d", i+1)
p.X.Label.Text = "X axis"
p.Y.Label.Text = "Y axis"
// Write plot to page.
p.Draw(draw.New(c))
}
f, err := os.Create("testdata/multipage.pdf")
if err != nil {
log.Fatal(err)
}
defer f.Close()
_, err = c.WriteTo(f)
if err != nil {
log.Fatalf("could not write canvas: %v", err)
}
err = f.Close()
if err != nil {
log.Fatalf("could not save canvas: %v", err)
}
}
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