From 49b87574ba54b7450f7c0520153f5d4a4695076f Mon Sep 17 00:00:00 2001
From: Nick White <git@njw.name>
Date: Wed, 28 Aug 2019 17:35:20 +0100
Subject: Move graph function to its own file, and further improve layout

---
 bookpipeline/graph.go | 140 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 bookpipeline/graph.go

(limited to 'bookpipeline/graph.go')

diff --git a/bookpipeline/graph.go b/bookpipeline/graph.go
new file mode 100644
index 0000000..27ffd39
--- /dev/null
+++ b/bookpipeline/graph.go
@@ -0,0 +1,140 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"path/filepath"
+	"sort"
+	"strconv"
+	"strings"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+const maxticks = 20
+const cutoff = 70
+
+type GraphConf struct {
+	pgnum, conf float64
+}
+
+func graph(confs map[string]*Conf, bookname string, w io.Writer) (error) {
+	// Organise confs to sort them by page
+	var graphconf []GraphConf
+	for _, conf := range confs {
+		name := filepath.Base(conf.path)
+		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)
+	}
+	sort.Slice(graphconf, func(i, j int) bool { return graphconf[i].pgnum < graphconf[j].pgnum })
+
+	// Create main xvalues and yvalues, annotations and ticks
+	var xvalues, yvalues []float64
+	var annotations []chart.Value2
+	var ticks []chart.Tick
+	i := 0
+	tickevery := len(graphconf) / maxticks
+	for _, c := range graphconf {
+		i = i + 1
+		xvalues = append(xvalues, c.pgnum)
+		yvalues = append(yvalues, c.conf)
+		if c.conf < cutoff {
+			annotations = append(annotations, chart.Value2{Label: fmt.Sprintf("%.0f", c.pgnum), XValue: c.pgnum, YValue: c.conf})
+		}
+		if tickevery % i == 0 {
+			ticks = append(ticks, chart.Tick{c.pgnum, fmt.Sprintf("%.0f", c.pgnum)})
+		}
+	}
+	mainSeries := chart.ContinuousSeries{
+		XValues: xvalues,
+		YValues: yvalues,
+	}
+
+	// Create 70% line
+	yvalues = []float64{}
+	for _ = range xvalues {
+		yvalues = append(yvalues, cutoff)
+	}
+	cutoffSeries := chart.ContinuousSeries{
+		XValues: xvalues,
+		YValues: yvalues,
+		Style: chart.Style{
+			Show:            true,
+			StrokeColor:     chart.ColorAlternateGreen,
+			StrokeDashArray: []float64{10.0, 5.0},
+		},
+	}
+
+	// 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{
+			Show:            true,
+			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{
+			Show:            true,
+			StrokeColor:     chart.ColorAlternateGray,
+			StrokeDashArray: []float64{5.0, 5.0},
+		},
+		XValues: xvalues,
+		YValues: yvalues,
+	}
+
+	graph := chart.Chart{
+		Title: bookname,
+		TitleStyle: chart.StyleShow(),
+		Width: 1920,
+		Height: 1080,
+		XAxis: chart.XAxis{
+			Name: "Page number",
+			NameStyle: chart.StyleShow(),
+			Style: chart.StyleShow(),
+			Range: &chart.ContinuousRange{
+				Min: 0.0,
+			},
+			Ticks: ticks,
+		},
+		YAxis: chart.YAxis{
+			Name: "Confidence",
+			NameStyle: chart.StyleShow(),
+			Style: chart.StyleShow(),
+			Range: &chart.ContinuousRange{
+				Min: 0.0,
+				Max: 100.0,
+			},
+		},
+		Series: []chart.Series{
+			mainSeries,
+			minSeries,
+			maxSeries,
+			cutoffSeries,
+			chart.AnnotationSeries{
+				Annotations: annotations,
+			},
+		},
+	}
+	return graph.Render(chart.PNG, w)
+}
-- 
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