85 lines
1.7 KiB
Go
85 lines
1.7 KiB
Go
package images
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import (
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"bytes"
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"image/color"
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"image/png"
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"io/ioutil"
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"strings"
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"github.com/fogleman/gg"
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"golang.org/x/image/font"
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"golang.org/x/image/font/opentype"
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)
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type RGBA struct {
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R, G, B, A float64
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}
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var parsedFont *opentype.Font = nil
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func ExtractInitials(fullName string, amountInitials int) string {
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if fullName == "" {
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return ""
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}
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var initials strings.Builder
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namesList := strings.Fields(fullName)
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for _, name := range namesList {
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if len(initials.String()) >= amountInitials {
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break
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}
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if name != "" {
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initials.WriteString(strings.ToUpper(name[0:1]))
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}
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}
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return initials.String()
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}
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// GenerateInitialsImage uppercaseRatio is <height of any upper case> / dc.FontHeight() (line height)
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// 0.60386123 for Inter-UI-Medium.otf
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func GenerateInitialsImage(initials string, bgColor, fontColor color.Color, fontFile string, size int, fontSize float64, uppercaseRatio float64) ([]byte, error) {
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// Load otf file
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fontBytes, 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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if parsedFont == nil {
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parsedFont, err = opentype.Parse(fontBytes)
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if err != nil {
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return nil, err
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}
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}
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halfSize := float64(size / 2)
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dc := gg.NewContext(size, size)
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dc.DrawCircle(halfSize, halfSize, halfSize)
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dc.SetColor(bgColor)
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dc.Fill()
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// Load font
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face, err := opentype.NewFace(parsedFont, &opentype.FaceOptions{
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Size: fontSize,
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DPI: 72,
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Hinting: font.HintingNone,
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})
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if err != nil {
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return nil, err
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}
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dc.SetFontFace(face)
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// Draw initials
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dc.SetColor(fontColor)
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dc.DrawStringAnchored(initials, halfSize, halfSize, 0.5, uppercaseRatio/2)
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img := dc.Image()
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buffer := new(bytes.Buffer)
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err = png.Encode(buffer, img)
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if err != nil {
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return nil, err
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}
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return buffer.Bytes(), nil
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}
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