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// Copyright ©2017 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 plot_test
import (
"math"
"os"
"gonum.org/v1/plot"
"gonum.org/v1/plot/vg"
"gonum.org/v1/plot/vg/draw"
"gonum.org/v1/plot/vg/vgimg"
)
func ExampleAlign() {
const rows, cols = 4, 3
plots := make([][]*plot.Plot, rows)
for j := 0; j < rows; j++ {
plots[j] = make([]*plot.Plot, cols)
for i := 0; i < cols; i++ {
if i == 0 && j == 2 {
// This shows what happens when there are nil plots.
continue
}
p, err := plot.New()
if err != nil {
panic(err)
}
if j == 0 && i == 2 {
// This shows what happens when the axis padding
// is different among plots.
p.X.Padding, p.Y.Padding = 0, 0
}
if j == 1 && i == 1 {
// To test the Align function, we make the axis labels
// on one of the plots stick out.
p.Y.Max = 1e9
p.X.Max = 1e9
p.X.Tick.Label.Rotation = math.Pi / 2
p.X.Tick.Label.XAlign = draw.XRight
p.X.Tick.Label.YAlign = draw.YCenter
p.X.Tick.Label.Font.Size = 8
p.Y.Tick.Label.Font.Size = 8
} else {
p.Y.Max = 1e9
p.X.Max = 1e9
p.X.Tick.Label.Font.Size = 1
p.Y.Tick.Label.Font.Size = 1
}
plots[j][i] = p
}
}
img := vgimg.New(vg.Points(150), vg.Points(175))
dc := draw.New(img)
t := draw.Tiles{
Rows: rows,
Cols: cols,
PadX: vg.Millimeter,
PadY: vg.Millimeter,
PadTop: vg.Points(2),
PadBottom: vg.Points(2),
PadLeft: vg.Points(2),
PadRight: vg.Points(2),
}
canvases := plot.Align(plots, t, dc)
for j := 0; j < rows; j++ {
for i := 0; i < cols; i++ {
if plots[j][i] != nil {
plots[j][i].Draw(canvases[j][i])
}
}
}
w, err := os.Create("testdata/align.png")
if err != nil {
panic(err)
}
defer w.Close()
png := vgimg.PngCanvas{Canvas: img}
if _, err := png.WriteTo(w); err != nil {
panic(err)
}
}
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