54 lines
1018 B
Go
54 lines
1018 B
Go
package gofpdf
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import (
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"math"
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// "strings"
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"unicode"
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)
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// SplitText splits UTF-8 encoded text into several lines using the current
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// font. Each line has its length limited to a maximum width given by w. This
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// function can be used to determine the total height of wrapped text for
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// vertical placement purposes.
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func (f *Fpdf) SplitText(txt string, w float64) (lines []string) {
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cw := f.currentFont.Cw
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wmax := int(math.Ceil((w - 2*f.cMargin) * 1000 / f.fontSize))
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s := []rune(txt) // Return slice of UTF-8 runes
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nb := len(s)
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for nb > 0 && s[nb-1] == '\n' {
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nb--
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}
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s = s[0:nb]
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sep := -1
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i := 0
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j := 0
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l := 0
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for i < nb {
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c := s[i]
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l += cw[c]
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if unicode.IsSpace(c) || isChinese(c) {
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sep = i
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}
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if c == '\n' || l > wmax {
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if sep == -1 {
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if i == j {
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i++
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}
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sep = i
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} else {
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i = sep + 1
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}
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lines = append(lines, string(s[j:sep]))
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sep = -1
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j = i
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l = 0
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} else {
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i++
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}
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}
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if i != j {
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lines = append(lines, string(s[j:i]))
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}
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return lines
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}
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