1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
package asciigraph
import (
"bytes"
"fmt"
"math"
"strings"
)
// Plot returns ascii graph for a series.
func Plot(series []float64, options ...Option) string {
var logMaximum float64
config := configure(config{
Offset: 3,
}, options)
if config.Width > 0 {
series = interpolateArray(series, config.Width)
}
minimum, maximum := minMaxFloat64Slice(series)
if config.Min != nil && *config.Min < minimum {
minimum = *config.Min
}
if config.Max != nil && *config.Max > maximum {
maximum = *config.Max
}
interval := math.Abs(maximum - minimum)
if config.Height <= 0 {
if int(interval) <= 0 {
config.Height = int(interval * math.Pow10(int(math.Ceil(-math.Log10(interval)))))
} else {
config.Height = int(interval)
}
}
if config.Offset <= 0 {
config.Offset = 3
}
var min2 float64
var max2 float64
var ratio float64
padding := 0.0 // if we set height to 10 but min and max are both 0, we need 10 units of padding
if interval != 0 {
ratio = float64(config.Height) / interval
} else {
ratio = 1
if config.Height > 0 {
padding = float64(config.Height)
}
}
min2 = round(minimum * ratio)
max2 = round((maximum + padding) * ratio)
intmin2 := int(min2)
intmax2 := int(max2)
rows := int(math.Abs(float64(intmax2 - intmin2)))
width := len(series) + config.Offset
var plot [][]string
// initialise empty 2D grid
for i := 0; i < rows+1; i++ {
var line []string
for j := 0; j < width; j++ {
line = append(line, " ")
}
plot = append(plot, line)
}
precision := 2
logMaximum = math.Log10(math.Max(math.Abs(maximum), math.Abs(minimum))) //to find number of zeros after decimal
if minimum == float64(0) && maximum == float64(0) {
logMaximum = float64(-1)
}
if logMaximum < 0 {
// negative log
if math.Mod(logMaximum, 1) != 0 {
// non-zero digits after decimal
precision = precision + int(math.Abs(logMaximum))
} else {
precision = precision + int(math.Abs(logMaximum)-1.0)
}
} else if logMaximum > 2 {
precision = 0
}
maxNumLength := len(fmt.Sprintf("%0.*f", precision, maximum))
minNumLength := len(fmt.Sprintf("%0.*f", precision, minimum))
maxWidth := int(math.Max(float64(maxNumLength), float64(minNumLength)))
// axis and labels
for y := intmin2; y < intmax2+1; y++ {
var magnitude float64
if rows > 0 {
magnitude = maximum - (float64(y-intmin2) * interval / float64(rows))
} else {
magnitude = float64(y)
}
label := fmt.Sprintf("%*.*f", maxWidth+1, precision, magnitude)
w := y - intmin2
h := int(math.Max(float64(config.Offset)-float64(len(label)), 0))
plot[w][h] = label
if y == 0 {
plot[w][config.Offset-1] = "┼"
} else {
plot[w][config.Offset-1] = "┤"
}
}
y0 := int(round(series[0]*ratio) - min2)
var y1 int
plot[rows-y0][config.Offset-1] = "┼" // first value
for x := 0; x < len(series)-1; x++ { // plot the line
y0 = int(round(series[x+0]*ratio) - float64(intmin2))
y1 = int(round(series[x+1]*ratio) - float64(intmin2))
if y0 == y1 {
plot[rows-y0][x+config.Offset] = "─"
} else {
if y0 > y1 {
plot[rows-y1][x+config.Offset] = "╰"
plot[rows-y0][x+config.Offset] = "╮"
} else {
plot[rows-y1][x+config.Offset] = "╭"
plot[rows-y0][x+config.Offset] = "╯"
}
start := int(math.Min(float64(y0), float64(y1))) + 1
end := int(math.Max(float64(y0), float64(y1)))
for y := start; y < end; y++ {
plot[rows-y][x+config.Offset] = "│"
}
}
}
// join columns
var lines bytes.Buffer
for h, horizontal := range plot {
if h != 0 {
lines.WriteRune('\n')
}
for _, v := range horizontal {
lines.WriteString(v)
}
}
// add caption if not empty
if config.Caption != "" {
lines.WriteRune('\n')
lines.WriteString(strings.Repeat(" ", config.Offset+maxWidth+2))
lines.WriteString(config.Caption)
}
return lines.String()
}
|
