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vg/vgsvg: bump DPI to 96, introduce functional options
Fixes #491.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| // Copyright ©2019 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 ( | ||
| "bytes" | ||
| "io/ioutil" | ||
| "log" | ||
| "testing" | ||
|
|
||
| "gonum.org/v1/plot" | ||
| "gonum.org/v1/plot/internal/cmpimg" | ||
| "gonum.org/v1/plot/plotter" | ||
| "gonum.org/v1/plot/vg" | ||
| "gonum.org/v1/plot/vg/draw" | ||
| "gonum.org/v1/plot/vg/vgsvg" | ||
| ) | ||
|
|
||
| func Example() { | ||
| p, err := plot.New() | ||
| if err != nil { | ||
| log.Fatalf("could not create plot: %v", err) | ||
| } | ||
| p.Title.Text = "Scatter plot" | ||
| p.X.Label.Text = "X" | ||
| p.Y.Label.Text = "Y" | ||
|
|
||
| scatter, err := plotter.NewScatter(plotter.XYs{{1, 1}, {0, 1}, {0, 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/scatter.svg") | ||
| if err != nil { | ||
| log.Fatalf("could not save SVG plot: %v", err) | ||
| } | ||
| } | ||
|
|
||
| func TestSVG(t *testing.T) { | ||
| cmpimg.CheckPlot(Example, t, "scatter.svg") | ||
| } | ||
|
|
||
| func TestNewWith(t *testing.T) { | ||
| p, err := plot.New() | ||
| if err != nil { | ||
| t.Fatalf("could not create plot: %v", err) | ||
| } | ||
| p.Title.Text = "Scatter plot" | ||
| p.X.Label.Text = "X" | ||
| p.Y.Label.Text = "Y" | ||
|
|
||
| scatter, err := plotter.NewScatter(plotter.XYs{{1, 1}, {0, 1}, {0, 0}}) | ||
| if err != nil { | ||
| t.Fatalf("could not create scatter: %v", err) | ||
| } | ||
| p.Add(scatter) | ||
|
|
||
| c := vgsvg.NewWith(vgsvg.UseDPI(96), vgsvg.UseWH(5*vg.Centimeter, 5*vg.Centimeter)) | ||
| p.Draw(draw.New(c)) | ||
|
|
||
| b := new(bytes.Buffer) | ||
| if _, err = c.WriteTo(b); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| want, err := ioutil.ReadFile("testdata/scatter_golden.svg") | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| ok, err := cmpimg.Equal("svg", b.Bytes(), want) | ||
| if err != nil { | ||
| t.Fatalf("could not compare images: %v", err) | ||
| } | ||
| if !ok { | ||
| t.Fatalf("images differ:\ngot:\n%s\nwant:\n%s\n", b.Bytes(), want) | ||
| } | ||
| } |