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270 lines
14 KiB
Go
270 lines
14 KiB
Go
// Package badge provides methods for generating SVG badges
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package badge
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// ////////////////////////////////////////////////////////////////////////////////// //
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// //
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// Copyright (c) 2021 ESSENTIAL KAOS //
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// Apache License, Version 2.0 <https://www.apache.org/licenses/LICENSE-2.0> //
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// //
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// ////////////////////////////////////////////////////////////////////////////////// //
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import (
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"io/ioutil"
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"math"
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"strconv"
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"strings"
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"github.com/golang/freetype/truetype"
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"golang.org/x/image/font"
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)
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// ////////////////////////////////////////////////////////////////////////////////// //
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// VERSION is current package version
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const VERSION = "1.2.0"
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const (
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COLOR_BLUE = "#007ec6"
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COLOR_BRIGHTGREEN = "#4c1"
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COLOR_GREEN = "#97ca00"
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COLOR_GREY = "#555"
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COLOR_LIGHTGREY = "#9f9f9f"
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COLOR_ORANGE = "#fe7d37"
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COLOR_RED = "#e05d44"
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COLOR_YELLOW = "#dfb317"
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COLOR_YELLOWGREEN = "#a4a61d"
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COLOR_SUCCESS = "#4c1"
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COLOR_IMPORTANT = "#fe7d37"
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COLOR_CRITICAL = "#e05d44"
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COLOR_INFORMATIONAL = "#007ec6"
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COLOR_INACTIVE = "#9f9f9f"
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)
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const (
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DEFAULT_OFFSET = 9 // default font offset
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DEFAULT_SPACING = 0 // default letter spacing
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)
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// ////////////////////////////////////////////////////////////////////////////////// //
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const _TEMPLATE_PLASTIC = `<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="{WIDTH}" height="18" role="img" aria-label="{LABEL}: {MESSAGE}"><title>{LABEL}: {MESSAGE}</title><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#fff" stop-opacity=".7"/><stop offset=".1" stop-color="#aaa" stop-opacity=".1"/><stop offset=".9" stop-color="#000" stop-opacity=".3"/><stop offset="1" stop-color="#000" stop-opacity=".5"/></linearGradient><clipPath id="r"><rect width="{WIDTH}" height="18" rx="4" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="{LABEL_WIDTH}" height="18" fill="#555"/><rect x="{LABEL_WIDTH}" width="{MESSAGE_WIDTH}" height="18" fill="{COLOR}"/><rect width="{WIDTH}" height="18" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="{FONT},Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="{FONT_SIZE}"><text aria-hidden="true" x="{LABEL_X}" y="140" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="{LABEL_LENGTH}">{LABEL}</text><text x="{LABEL_X}" y="130" transform="scale(.1)" fill="#fff" textLength="{LABEL_LENGTH}">{LABEL}</text><text aria-hidden="true" x="{MESSAGE_X}" y="140" fill="{MESSAGE_SHADOW}" fill-opacity=".3" transform="scale(.1)" textLength="{MESSAGE_LENGTH}">{MESSAGE}</text><text x="{MESSAGE_X}" y="130" transform="scale(.1)" fill="{MESSAGE_COLOR}" textLength="{MESSAGE_LENGTH}">{MESSAGE}</text></g></svg>`
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const _TEMPLATE_FLAT = `<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="{WIDTH}" height="20" role="img" aria-label="{LABEL}: {MESSAGE}"><title>{LABEL}: {MESSAGE}</title><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="r"><rect width="{WIDTH}" height="20" rx="3" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="{LABEL_WIDTH}" height="20" fill="#555"/><rect x="{LABEL_WIDTH}" width="{MESSAGE_WIDTH}" height="20" fill="{COLOR}"/><rect width="{WIDTH}" height="20" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="{FONT},Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="{FONT_SIZE}"><text aria-hidden="true" x="{LABEL_X}" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="{LABEL_LENGTH}">{LABEL}</text><text x="{LABEL_X}" y="140" transform="scale(.1)" fill="#fff" textLength="{LABEL_LENGTH}">{LABEL}</text><text aria-hidden="true" x="{MESSAGE_X}" y="150" fill="{MESSAGE_SHADOW}" fill-opacity=".3" transform="scale(.1)" textLength="{MESSAGE_LENGTH}">{MESSAGE}</text><text x="{MESSAGE_X}" y="140" transform="scale(.1)" fill="{MESSAGE_COLOR}" textLength="{MESSAGE_LENGTH}">{MESSAGE}</text></g></svg>`
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const _TEMPLATE_FLAT_SQUARE = `<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="{WIDTH}" height="20" role="img" aria-label="{LABEL}: {MESSAGE}"><title>{LABEL}: {MESSAGE}</title><g shape-rendering="crispEdges"><rect width="{LABEL_WIDTH}" height="20" fill="#555"/><rect x="{LABEL_WIDTH}" width="{MESSAGE_WIDTH}" height="20" fill="{COLOR}"/></g><g fill="#fff" text-anchor="middle" font-family="{FONT},Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="{FONT_SIZE}"><text x="{LABEL_X}" y="140" transform="scale(.1)" fill="#fff" textLength="{LABEL_LENGTH}">{LABEL}</text><text x="{MESSAGE_X}" y="140" transform="scale(.1)" fill="{MESSAGE_COLOR}" textLength="{MESSAGE_LENGTH}">{MESSAGE}</text></g></svg>`
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const _TEMPLATE_FLAT_SIMPLE = `<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="{WIDTH}" height="20" role="img" aria-label="{MESSAGE}"><title>{MESSAGE}</title><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="r"><rect width="{WIDTH}" height="20" rx="3" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="0" height="20" fill="{COLOR}"/><rect x="0" width="{WIDTH}" height="20" fill="{COLOR}"/><rect width="{WIDTH}" height="20" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="{FONT},Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="{FONT_SIZE}"><text aria-hidden="true" x="{MESSAGE_X}" y="150" fill="{MESSAGE_SHADOW}" fill-opacity=".3" transform="scale(.1)" textLength="{MESSAGE_LENGTH}">{MESSAGE}</text><text x="{MESSAGE_X}" y="140" transform="scale(.1)" fill="{MESSAGE_COLOR}" textLength="{MESSAGE_LENGTH}">{MESSAGE}</text></g></svg>`
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const _TEMPLATE_PLASTIC_SIMPLE = `<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="{WIDTH}" height="18" role="img" aria-label="{MESSAGE}"><title>TESTTEST</title><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#fff" stop-opacity=".7"/><stop offset=".1" stop-color="#aaa" stop-opacity=".1"/><stop offset=".9" stop-color="#000" stop-opacity=".3"/><stop offset="1" stop-color="#000" stop-opacity=".5"/></linearGradient><clipPath id="r"><rect width="{WIDTH}" height="18" rx="4" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="0" height="18" fill="{COLOR}"/><rect x="0" width="{WIDTH}" height="18" fill="{COLOR}"/><rect width="{WIDTH}" height="18" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="{FONT},Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="{FONT_SIZE}"><text aria-hidden="true" x="{MESSAGE_X}" y="140" fill="{MESSAGE_SHADOW}" fill-opacity=".3" transform="scale(.1)" textLength="{MESSAGE_LENGTH}">{MESSAGE}</text><text x="{MESSAGE_X}" y="130" transform="scale(.1)" fill="{MESSAGE_COLOR}" textLength="{MESSAGE_LENGTH}">{MESSAGE}</text></g></svg>`
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const _TEMPLATE_FLAT_SQUARE_SIMPLE = `<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="{WIDTH}" height="20" role="img" aria-label="{MESSAGE}"><title>{MESSAGE}</title><g shape-rendering="crispEdges"><rect width="0" height="20" fill="{COLOR}"/><rect x="0" width="{WIDTH}" height="20" fill="{COLOR}"/></g><g fill="#fff" text-anchor="middle" font-family="{FONT},Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="{FONT_SIZE}"><text x="{MESSAGE_X}" y="140" transform="scale(.1)" fill="{MESSAGE_COLOR}" textLength="{MESSAGE_LENGTH}">{MESSAGE}</text></g></svg>`
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// ////////////////////////////////////////////////////////////////////////////////// //
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// Generator is badge generator
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type Generator struct {
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Offset int // Text offset
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Spacing float64 // Letter spacing
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fontSize int
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fontName string
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drawer *font.Drawer
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}
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// ////////////////////////////////////////////////////////////////////////////////// //
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// NewGenerator creates new badge generator with given font
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func NewGenerator(fontFile string, fontSize int) (*Generator, error) {
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fontData, err := ioutil.ReadFile(fontFile)
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if err != nil {
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return nil, err
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}
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fontTTF, err := truetype.Parse(fontData)
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if err != nil {
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return nil, err
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}
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return &Generator{
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Offset: DEFAULT_OFFSET,
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Spacing: DEFAULT_SPACING,
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fontSize: fontSize,
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fontName: fontTTF.Name(truetype.NameIDFontFullName),
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drawer: &font.Drawer{
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Face: truetype.NewFace(fontTTF, &truetype.Options{
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Size: float64(fontSize),
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DPI: 72,
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Hinting: font.HintingFull,
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}),
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},
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}, nil
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}
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// ////////////////////////////////////////////////////////////////////////////////// //
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// GeneratePlastic generates SVG badge in plastic style
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func (g *Generator) GeneratePlastic(label, message, color string) []byte {
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if label == "" {
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return g.generateBadgeSimple(_TEMPLATE_PLASTIC_SIMPLE, message, color)
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}
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return g.generateBadge(_TEMPLATE_PLASTIC, label, message, color)
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}
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// GenerateFlat generates SVG badge in flat style
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func (g *Generator) GenerateFlat(label, message, color string) []byte {
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if label == "" {
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return g.generateBadgeSimple(_TEMPLATE_FLAT_SIMPLE, message, color)
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}
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return g.generateBadge(_TEMPLATE_FLAT, label, message, color)
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}
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// GenerateFlatSquare generates SVG badge in flat-square style
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func (g *Generator) GenerateFlatSquare(label, message, color string) []byte {
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if label == "" {
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return g.generateBadgeSimple(_TEMPLATE_FLAT_SQUARE_SIMPLE, message, color)
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}
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return g.generateBadge(_TEMPLATE_FLAT_SQUARE, label, message, color)
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}
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// GeneratePlasticSimple generates SVG simple badge in plastic style
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func (g *Generator) GeneratePlasticSimple(message, color string) []byte {
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return g.generateBadgeSimple(_TEMPLATE_PLASTIC_SIMPLE, message, color)
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}
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// GenerateFlatSimple generates SVG simple badge in flat style
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func (g *Generator) GenerateFlatSimple(message, color string) []byte {
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return g.generateBadgeSimple(_TEMPLATE_FLAT_SIMPLE, message, color)
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}
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// GenerateFlatSquareSimple generates SVG simple badge in flat-square style
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func (g *Generator) GenerateFlatSquareSimple(message, color string) []byte {
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return g.generateBadgeSimple(_TEMPLATE_FLAT_SQUARE_SIMPLE, message, color)
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}
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// ////////////////////////////////////////////////////////////////////////////////// //
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// generateBadge generates badge with given template
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func (g *Generator) generateBadge(template, label, message, color string) []byte {
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color = formatColor(color)
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gF := float64(g.Offset)
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lW := float64(g.drawer.MeasureString(label)>>6) + gF
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mW := float64(g.drawer.MeasureString(message)>>6) + gF
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fW := lW + mW
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lX := (lW/2 + 1) * 10
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mX := (lW + (mW / 2) - 1) * 10
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lL := (lW - gF) * (10.0 + g.Spacing - 0.5)
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mL := (mW - gF) * (10.0 + g.Spacing - 0.5)
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fS := g.fontSize * 10
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mC, mS := getMessageColors(color)
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badge := strings.ReplaceAll(template, "{LABEL}", label)
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badge = strings.ReplaceAll(badge, "{MESSAGE}", message)
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badge = strings.ReplaceAll(badge, "{COLOR}", "#"+color)
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badge = strings.ReplaceAll(badge, "{WIDTH}", formatFloat(fW))
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badge = strings.ReplaceAll(badge, "{LABEL_WIDTH}", formatFloat(lW))
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badge = strings.ReplaceAll(badge, "{MESSAGE_WIDTH}", formatFloat(mW))
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badge = strings.ReplaceAll(badge, "{LABEL_X}", formatFloat(lX))
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badge = strings.ReplaceAll(badge, "{MESSAGE_X}", formatFloat(mX))
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badge = strings.ReplaceAll(badge, "{LABEL_LENGTH}", formatFloat(lL))
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badge = strings.ReplaceAll(badge, "{MESSAGE_LENGTH}", formatFloat(mL))
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badge = strings.ReplaceAll(badge, "{MESSAGE_COLOR}", mC)
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badge = strings.ReplaceAll(badge, "{MESSAGE_SHADOW}", mS)
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badge = strings.ReplaceAll(badge, "{FONT}", g.fontName)
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badge = strings.ReplaceAll(badge, "{FONT_SIZE}", strconv.Itoa(fS))
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return []byte(badge)
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}
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// generateBadgeSimple generates badge with given template
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func (g *Generator) generateBadgeSimple(template, message, color string) []byte {
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color = formatColor(color)
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gF := float64(g.Offset)
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fW := float64(g.drawer.MeasureString(message)>>6) + gF
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mX := (fW / 2) * 10
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mL := (fW - gF) * (10.0 + g.Spacing)
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fS := g.fontSize * 10
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mC, mS := getMessageColors(color)
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badge := strings.ReplaceAll(template, "{MESSAGE}", message)
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badge = strings.ReplaceAll(badge, "{COLOR}", "#"+color)
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badge = strings.ReplaceAll(badge, "{WIDTH}", strconv.Itoa(int(fW)))
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badge = strings.ReplaceAll(badge, "{MESSAGE_X}", strconv.Itoa(int(mX)))
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badge = strings.ReplaceAll(badge, "{MESSAGE_LENGTH}", strconv.Itoa(int(mL)))
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badge = strings.ReplaceAll(badge, "{MESSAGE_COLOR}", mC)
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badge = strings.ReplaceAll(badge, "{MESSAGE_SHADOW}", mS)
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badge = strings.ReplaceAll(badge, "{FONT}", g.fontName)
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badge = strings.ReplaceAll(badge, "{FONT_SIZE}", strconv.Itoa(fS))
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return []byte(badge)
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}
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// ////////////////////////////////////////////////////////////////////////////////// //
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func formatColor(c string) string {
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if strings.HasPrefix(c, "#") {
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c = strings.TrimLeft(c, "#")
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}
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// Short hex
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if len(c) == 3 {
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c = strings.Repeat(string(c[0]), 2) +
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strings.Repeat(string(c[1]), 2) +
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strings.Repeat(string(c[2]), 2)
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}
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return c
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}
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// formatFloat formats float values
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func formatFloat(v float64) string {
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return strconv.FormatFloat(v, 'f', 0, 64)
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}
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// getMessageColors returns message text and shadow colors based on color of badge
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func getMessageColors(badgeColor string) (string, string) {
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c := parseColor(badgeColor)
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if c == 0 || calcLuminance(c) < 0.5 {
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return "#fff", "#010101"
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}
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return "#333", "#ccc"
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}
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// parseColor parses hex color
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func parseColor(c string) int {
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i, _ := strconv.ParseInt(c, 16, 64)
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return int(i)
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}
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// calcLuminance calculates relative luminance
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func calcLuminance(color int) float64 {
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r := calcLumColor(float64(color>>16&0xFF) / 255)
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g := calcLumColor(float64(color>>8&0xFF) / 255)
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b := calcLumColor(float64(color&0xFF) / 255)
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return 0.2126*r + 0.7152*g + 0.0722*b
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}
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// calcLumColor calculates luminance for one color
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func calcLumColor(c float64) float64 {
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if c <= 0.03928 {
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return c / 12.92
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}
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return math.Pow(((c + 0.055) / 1.055), 2.4)
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}
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