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chart.go
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chart.go
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// Copyright 2017 Richard Lehane. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package chart
import (
"bytes"
"fmt"
"strings"
)
const max = 10
func squares(num int, rel float64, abs bool) string {
if rel < 1 && !abs {
nnum := int(float64(num) * rel)
if nnum == 0 && num > 0 {
nnum = 1
}
num = nnum
}
s := make([]string, num)
for i := 0; i < num; i++ {
s[i] = "\xE2\x96\xA0"
}
return strings.Join(s, " ")
}
func Chart(title string, sections, fields []string, abs map[string]bool, frequencies map[string]map[string]int) string {
buf := &bytes.Buffer{}
if len(title) > 0 {
buf.WriteString(strings.ToUpper(title))
}
var pad int // pad to length longest field
for _, v := range fields {
if len(v) > pad {
pad = len(v) + 1
}
}
template := fmt.Sprintf("%%-%ds %%s (%%d)\n", pad)
var rel float64 = 1
for _, m := range frequencies {
for _, num := range m {
if num > max && float64(max)/float64(num) < rel {
rel = float64(max) / float64(num)
}
}
}
for _, k := range sections {
if m, ok := frequencies[k]; ok {
fmt.Fprintf(buf, "\n%s\n", k)
for _, label := range fields {
if num, ok := m[label]; ok {
fmt.Fprintf(buf, template, label+":", squares(num, rel, abs[label]), num)
}
}
}
}
return buf.String()
}