Commits
Diff
diff --git a/font/main.go b/font/main.go
index 29d54ee..7520e90 100644
--- a/font/main.go
+++ b/font/main.go
@@ -446 +446 @@ func GetLines(t element.Text) []string {
- fmt.Println(lines)
+
package font
import (
"fmt"
"gui/element"
"image"
"image/color"
"image/draw"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"runtime"
"sort"
"strconv"
"strings"
"github.com/golang/freetype/truetype"
"golang.org/x/image/font"
"golang.org/x/image/math/fixed"
)
// LoadSystemFont loads a font from the system fonts directory or loads a specific font by name
func GetFontPath(fontName string, bold, italic bool) string {
if len(fontName) == 0 {
fontName = "serif"
}
// Check if a special font family is requested
switch fontName {
case "sans-serif":
return tryLoadSystemFont("Arial", bold, italic)
case "monospace":
return tryLoadSystemFont("Andle Mono", bold, italic)
case "serif":
return tryLoadSystemFont("Georgia", bold, italic)
}
// Use the default font if the specified font is not found
return tryLoadSystemFont(fontName, bold, italic)
}
var allFonts, _ = getSystemFonts()
func tryLoadSystemFont(fontName string, bold, italic bool) string {
font := fontName
if bold {
font += " Bold"
}
if italic {
font += " Italic"
}
for _, v := range allFonts {
if strings.Contains(v, "/"+font) {
return v
}
}
return ""
}
func sortByLength(strings []string) {
sort.Slice(strings, func(i, j int) bool {
return len(strings[i]) < len(strings[j])
})
}
func GetFontSize(css map[string]string) float32 {
fL := len(css["font-size"])
var fs float32 = 16
if fL > 0 {
if css["font-size"][fL-2:] == "px" {
fs64, _ := strconv.ParseFloat(css["font-size"][0:fL-2], 32)
fs = float32(fs64)
}
if css["font-size"][fL-2:] == "em" {
fs64, _ := strconv.ParseFloat(css["font-size"][0:fL-2], 32)
fs = float32(fs64)
}
}
return fs
}
func LoadFont(fontName string, fontSize int, bold, italic bool) (font.Face, error) {
// Use a TrueType font file for the specified font name
fontFile := GetFontPath(fontName, bold, italic)
// Read the font file
fontData, err := os.ReadFile(fontFile)
if err != nil {
return nil, err
}
// Parse the TrueType font data
fnt, err := truetype.Parse(fontData)
if err != nil {
return nil, err
}
options := truetype.Options{
Size: float64(fontSize),
DPI: 72,
Hinting: font.HintingNone,
}
// Create a new font face with the specified size
return truetype.NewFace(fnt, &options), nil
}
func MeasureLine(n *element.Node) (int, int) {
passed := false
lineOffset, nodeOffset := 0, 0
for _, v := range n.Parent.Children {
l := MeasureText(&v.Text, v.Text.Text)
if v.Id == n.Id {
passed = true
lineOffset += l
} else {
if !passed {
nodeOffset += l
}
lineOffset += l
}
}
return lineOffset, nodeOffset
}
func MeasureText(t *element.Text, text string) int {
var width fixed.Int26_6
for _, runeValue := range text {
if runeValue == ' ' {
// Handle spaces separately, add word spacing
width += fixed.I(t.WordSpacing)
} else {
adv, ok := t.Font.GlyphAdvance(runeValue)
if !ok {
continue
}
// Update the total width with the glyph advance and bounds
width += adv + fixed.I(t.LetterSpacing)
}
}
return width.Round()
}
func MeasureSpace(t *element.Text) int {
adv, _ := t.Font.GlyphAdvance(' ')
return adv.Round()
}
func getSystemFonts() ([]string, error) {
var fontPaths []string
switch runtime.GOOS {
case "windows":
fontPaths = append(fontPaths, getWindowsFontPaths()...)
case "darwin":
fontPaths = append(fontPaths, getMacFontPaths()...)
case "linux":
fontPaths = append(fontPaths, getLinuxFontPaths()...)
default:
return nil, fmt.Errorf("unsupported operating system: %s", runtime.GOOS)
}
sortByLength(fontPaths)
return fontPaths, nil
}
func getWindowsFontPaths() []string {
var fontPaths []string
// System Fonts
systemFontsDir := "C:\\Windows\\Fonts"
getFontsRecursively(systemFontsDir, &fontPaths)
// User Fonts
userFontsDir := os.ExpandEnv("%APPDATA%\\Microsoft\\Windows\\Fonts")
getFontsRecursively(userFontsDir, &fontPaths)
return fontPaths
}
func getMacFontPaths() []string {
var fontPaths []string
// System Fonts
systemFontsDirs := []string{"/System/Library/Fonts", "/Library/Fonts"}
for _, dir := range systemFontsDirs {
getFontsRecursively(dir, &fontPaths)
}
// User Fonts
userFontsDir := filepath.Join(os.Getenv("HOME"), "Library/Fonts")
getFontsRecursively(userFontsDir, &fontPaths)
return fontPaths
}
func getLinuxFontPaths() []string {
var fontPaths []string
// System Fonts
systemFontsDirs := []string{"/usr/share/fonts", "/usr/local/share/fonts"}
for _, dir := range systemFontsDirs {
getFontsRecursively(dir, &fontPaths)
}
// User Fonts
userFontsDir := filepath.Join(os.Getenv("HOME"), ".fonts")
getFontsRecursively(userFontsDir, &fontPaths)
return fontPaths
}
func getFontsRecursively(dir string, fontPaths *[]string) {
files, err := ioutil.ReadDir(dir)
if err != nil {
fmt.Println("Error reading directory:", err)
return
}
for _, file := range files {
path := filepath.Join(dir, file.Name())
if file.IsDir() {
getFontsRecursively(path, fontPaths)
} else if strings.HasSuffix(strings.ToLower(file.Name()), ".ttf") {
*fontPaths = append(*fontPaths, path)
}
}
}
func Render(n *element.Node) float32 {
t := &n.Text
lines := GetLines(*t)
shiftText := false
if t.LineHeight == 0 {
t.LineHeight = t.EM + 3
} else {
shiftText = true
}
// Use fully transparent color for the background
img := image.NewRGBA(image.Rect(0, 0, t.Width, t.LineHeight*(len(lines))))
r, g, b, a := t.Color.RGBA()
draw.Draw(img, img.Bounds(), &image.Uniform{color.RGBA{uint8(r), uint8(g), uint8(b), 0}}, image.Point{}, draw.Over)
dot := fixed.Point26_6{X: fixed.I(0), Y: t.Font.Metrics().Ascent}
dr := &font.Drawer{
Dst: img,
Src: &image.Uniform{color.RGBA{uint8(r), uint8(g), uint8(b), uint8(a)}},
Face: t.Font,
Dot: dot,
}
t.Image = img
fh := fixed.I(t.LineHeight)
if shiftText {
dr.Dot.Y += fh / 3
}
for _, v := range lines {
if t.Align == "justify" {
dr.Dot.X = 0
spaces := strings.Count(v, " ")
if spaces > 1 {
spacing := fixed.I((t.Width - MeasureText(t, v)) / spaces)
if spacing > 0 {
for _, word := range strings.Fields(v) {
dr.DrawString(word)
dr.Dot.X += spacing
}
} else {
dr.Dot.X = 0
drawString(*t, dr, v)
}
} else {
dr.Dot.X = 0
drawString(*t, dr, v)
}
} else {
if t.Align == "left" || t.Align == "" {
dr.Dot.X = 0
} else if t.Align == "center" {
dr.Dot.X = fixed.I((t.Width - MeasureText(t, v)) / 2)
} else if t.Align == "right" {
dr.Dot.X = fixed.I(t.Width - MeasureText(t, v))
}
// dr.Dot.X = 0
drawString(*t, dr, v)
}
dr.Dot.Y += fh
}
return float32(t.LineHeight * len(lines))
}
func drawString(t element.Text, dr *font.Drawer, v string) {
underlinePosition := dr.Dot
for _, ch := range v {
if ch == ' ' {
// Handle spaces separately, add word spacing
dr.Dot.X += fixed.I(t.WordSpacing)
} else {
dr.DrawString(string(ch))
dr.Dot.X += fixed.I(t.LetterSpacing)
}
}
if t.Underlined || t.Overlined || t.LineThrough {
underlinePosition.X = 0
baseLineY := underlinePosition.Y
if t.Underlined {
underlinePosition.Y = baseLineY + t.Font.Metrics().Descent
drawLine(t.Image, underlinePosition, dr.Dot.X, t.DecorationThickness, t.DecorationColor)
}
if t.LineThrough {
underlinePosition.Y = baseLineY - (t.Font.Metrics().Descent)
drawLine(t.Image, underlinePosition, dr.Dot.X, t.DecorationThickness, t.DecorationColor)
}
if t.Overlined {
underlinePosition.Y = baseLineY - t.Font.Metrics().Descent*3
drawLine(t.Image, underlinePosition, dr.Dot.X, t.DecorationThickness, t.DecorationColor)
}
}
}
func wrap(t element.Text, breaker string, breakNewLines bool) []string {
var start int = 0
strngs := []string{}
var text []string
broken := strings.Split(t.Text, breaker)
re := regexp.MustCompile(`[\r\n]+`)
if breakNewLines {
for _, v := range broken {
text = append(text, re.Split(v, -1)...)
}
} else {
text = append(text, broken...)
}
for i := 0; i < len(text); i++ {
text[i] = re.ReplaceAllString(text[i], "")
}
for i := 0; i < len(text)-1; i++ {
seg := strings.Join(text[start:i], breaker)
if MeasureText(&t, seg+breaker+text[i+1]) > t.Width {
strngs = append(strngs, seg)
start = i
}
}
if len(strngs) > 0 {
strngs = append(strngs, strings.Join(text[start:], breaker))
} else {
strngs = append(strngs, strings.Join(text[start:], breaker))
}
return strngs
}
func drawLine(img draw.Image, start fixed.Point26_6, width fixed.Int26_6, thickness int, col color.Color) {
// Bresenham's line algorithm
x0, y0 := start.X.Round(), start.Y.Round()
x1 := x0 + int(width)
y1 := y0
dx := abs(x1 - x0)
dy := abs(y1 - y0)
sx, sy := 1, 1
if x0 > x1 {
sx = -1
}
if y0 > y1 {
sy = -1
}
err := dx - dy
for {
for i := 0; i < thickness; i++ {
img.Set(x0, (y0-(thickness/2))+i, col)
}
if x0 == x1 && y0 == y1 {
break
}
e2 := 2 * err
if e2 > -dy {
err -= dy
x0 += sx
}
if e2 < dx {
err += dx
y0 += sy
}
}
}
func abs(x int) int {
if x < 0 {
return -x
}
return x
}
func GetLines(t element.Text) []string {
var lines []string
if t.WhiteSpace == "nowrap" {
re := regexp.MustCompile(`\s+`)
t.Text = re.ReplaceAllString(t.Text, " ")
lines = wrap(t, "
", false)
} else {
if t.WhiteSpace == "pre" {
re := regexp.MustCompile("\t")
t.Text = re.ReplaceAllString(t.Text, " ")
nl := regexp.MustCompile(`[\r\n]+`)
lines = nl.Split(t.Text, -1)
} else if t.WhiteSpace == "pre-line" {
re := regexp.MustCompile(`\s+`)
t.Text = re.ReplaceAllString(t.Text, " ")
lines = wrap(t, " ", true)
} else if t.WhiteSpace == "pre-wrap" {
lines = wrap(t, " ", true)
} else {
re := regexp.MustCompile(`\s+`)
t.Text = re.ReplaceAllString(t.Text, " ")
nl := regexp.MustCompile(`[\r\n]+`)
t.Text = nl.ReplaceAllString(t.Text, "")
t.Text = strings.TrimSpace(t.Text)
lines = wrap(t, t.WordBreak, false)
}
for i, v := range lines {
lines[i] = v + t.WordBreak
}
}
fmt.Println(lines)
return lines
}