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// Copyright 2019 Nick White.
// Use of this source code is governed by the GPLv3
// license that can be found in the LICENSE file.
package bookpipeline
import (
"errors"
"fmt"
"io"
"path/filepath"
"sort"
"strconv"
"strings"
"github.com/wcharczuk/go-chart/v2"
"github.com/wcharczuk/go-chart/v2/drawing"
)
const maxticks = 40
const goodCutoff = 70
const mediumCutoff = 65
const badCutoff = 60
const yticknum = 40
type Conf struct {
Path, Code string
Conf float64
}
type GraphConf struct {
Pgnum, Conf float64
}
// createLine creates a horizontal line with a particular y value for
// a graph
func createLine(xvalues []float64, y float64, c drawing.Color) chart.ContinuousSeries {
var yvalues []float64
for range xvalues {
yvalues = append(yvalues, y)
}
return chart.ContinuousSeries{
XValues: xvalues,
YValues: yvalues,
Style: chart.Style{
StrokeColor: c,
},
}
}
// Graph creates a graph of the confidence of each page in a book
func Graph(confs map[string]*Conf, bookname string, w io.Writer) error {
return GraphOpts(confs, bookname, "Page number", true, w)
}
// GraphOpts creates a graph of confidences
func GraphOpts(confs map[string]*Conf, bookname string, xaxis string, guidelines bool, w io.Writer) error {
if len(confs) < 2 {
return errors.New("Not enough valid confidences")
}
// Organise confs to sort them by page
var graphconf []GraphConf
for _, conf := range confs {
name := filepath.Base(conf.Path)
var numend int
numend = strings.Index(name, "_")
if numend == -1 {
numend = strings.Index(name, ".")
}
pgnum, err := strconv.ParseFloat(name[0:numend], 64)
if err != nil {
continue
}
var c GraphConf
c.Pgnum = pgnum
c.Conf = conf.Conf
graphconf = append(graphconf, c)
}
// If we failed to get any page numbers, just fake the lot
if len(graphconf) == 0 {
i := float64(1)
for _, conf := range confs {
var c GraphConf
c.Pgnum = i
c.Conf = conf.Conf
graphconf = append(graphconf, c)
i++
}
}
sort.Slice(graphconf, func(i, j int) bool { return graphconf[i].Pgnum < graphconf[j].Pgnum })
// Create main xvalues, yvalues ticks
var xvalues, yvalues []float64
var ticks []chart.Tick
var yticks []chart.Tick
tickevery := len(graphconf) / maxticks
if tickevery < 1 {
tickevery = 1
}
for i, c := range graphconf {
xvalues = append(xvalues, c.Pgnum)
yvalues = append(yvalues, c.Conf)
if i%tickevery == 0 {
ticks = append(ticks, chart.Tick{Value: c.Pgnum, Label: fmt.Sprintf("%.0f", c.Pgnum)})
}
}
// Make last tick the final page
final := graphconf[len(graphconf)-1]
ticks[len(ticks)-1] = chart.Tick{Value: final.Pgnum, Label: fmt.Sprintf("%.0f", final.Pgnum)}
for i := 0; i <= yticknum; i++ {
n := float64(i*100) / yticknum
yticks = append(yticks, chart.Tick{Value: n, Label: fmt.Sprintf("%.1f", n)})
}
mainSeries := chart.ContinuousSeries{
Style: chart.Style{
StrokeColor: chart.ColorBlue,
FillColor: chart.ColorAlternateBlue,
},
XValues: xvalues,
YValues: yvalues,
}
// Create lines
goodCutoffSeries := createLine(xvalues, goodCutoff, chart.ColorAlternateGreen)
mediumCutoffSeries := createLine(xvalues, mediumCutoff, chart.ColorOrange)
badCutoffSeries := createLine(xvalues, badCutoff, chart.ColorRed)
// Create lines marking top and bottom 10% confidence
sort.Slice(graphconf, func(i, j int) bool { return graphconf[i].Conf < graphconf[j].Conf })
lowconf := graphconf[int(len(graphconf)/10)].Conf
highconf := graphconf[int((len(graphconf)/10)*9)].Conf
yvalues = []float64{}
for range graphconf {
yvalues = append(yvalues, lowconf)
}
minSeries := &chart.ContinuousSeries{
Style: chart.Style{
StrokeColor: chart.ColorAlternateGray,
StrokeDashArray: []float64{5.0, 5.0},
},
XValues: xvalues,
YValues: yvalues,
}
yvalues = []float64{}
for range graphconf {
yvalues = append(yvalues, highconf)
}
maxSeries := &chart.ContinuousSeries{
Style: chart.Style{
StrokeColor: chart.ColorAlternateGray,
StrokeDashArray: []float64{5.0, 5.0},
},
XValues: xvalues,
YValues: yvalues,
}
// Create annotations
var annotations []chart.Value2
for _, c := range graphconf {
if !guidelines || (c.Conf > highconf || c.Conf < lowconf) {
annotations = append(annotations, chart.Value2{Label: fmt.Sprintf("%.0f", c.Pgnum), XValue: c.Pgnum, YValue: c.Conf})
}
}
annotations = append(annotations, chart.Value2{Label: fmt.Sprintf("%.0f", lowconf), XValue: xvalues[len(xvalues)-1], YValue: lowconf})
annotations = append(annotations, chart.Value2{Label: fmt.Sprintf("%.0f", highconf), XValue: xvalues[len(xvalues)-1], YValue: highconf})
graph := chart.Chart{
Title: bookname,
Width: 3840,
Height: 2160,
XAxis: chart.XAxis{
Name: xaxis,
Range: &chart.ContinuousRange{
Min: 0.0,
},
Ticks: ticks,
},
YAxis: chart.YAxis{
Name: "Confidence",
Range: &chart.ContinuousRange{
Min: 0.0,
Max: 100.0,
},
Ticks: yticks,
},
Series: []chart.Series{
mainSeries,
chart.AnnotationSeries{
Annotations: annotations,
},
},
}
if guidelines {
for _, s := range []chart.Series{
minSeries,
maxSeries,
goodCutoffSeries,
mediumCutoffSeries,
badCutoffSeries,
} {
graph.Series = append(graph.Series, s)
}
}
return graph.Render(chart.PNG, w)
}
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