splittext.go

Documentation: github.com/jung-kurt/gofpdf

     1  package gofpdf
     2  
     3  import (
     4  	"math"
     5  	//	"strings"
     6  	"unicode"
     7  )
     8  
     9  // SplitText splits UTF-8 encoded text into several lines using the current
    10  // font. Each line has its length limited to a maximum width given by w. This
    11  // function can be used to determine the total height of wrapped text for
    12  // vertical placement purposes.
    13  func (f *Fpdf) SplitText(txt string, w float64) (lines []string) {
    14  	cw := f.currentFont.Cw
    15  	wmax := int(math.Ceil((w - 2*f.cMargin) * 1000 / f.fontSize))
    16  	s := []rune(txt) // Return slice of UTF-8 runes
    17  	nb := len(s)
    18  	for nb > 0 && s[nb-1] == '\n' {
    19  		nb--
    20  	}
    21  	s = s[0:nb]
    22  	sep := -1
    23  	i := 0
    24  	j := 0
    25  	l := 0
    26  	for i < nb {
    27  		c := s[i]
    28  		l += cw[c]
    29  		if unicode.IsSpace(c) || isChinese(c) {
    30  			sep = i
    31  		}
    32  		if c == '\n' || l > wmax {
    33  			if sep == -1 {
    34  				if i == j {
    35  					i++
    36  				}
    37  				sep = i
    38  			} else {
    39  				i = sep + 1
    40  			}
    41  			lines = append(lines, string(s[j:sep]))
    42  			sep = -1
    43  			j = i
    44  			l = 0
    45  		} else {
    46  			i++
    47  		}
    48  	}
    49  	if i != j {
    50  		lines = append(lines, string(s[j:i]))
    51  	}
    52  	return lines
    53  }
    54
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