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feat:可设置文本超出后是否自动换行以及超出后省略符的位置
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@yeyudekuangxiang
yeyudekuangxiang committed Nov 5, 2021
1 parent 4b9f40f commit 0c63694
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Showing 3 changed files with 148 additions and 78 deletions.
25 changes: 18 additions & 7 deletions examples/main.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -37,23 +37,34 @@ func main() {
fillText.SetLineHeight(90)
fillText.SetTextAlign("left")
fillText.SetArea(1300, 0, 500, 1000)
fillText.SetMaxLineNum(3)
loadImage.Fill(fillText)

//单行文字不分行
fillText2 := imagedraw.NewText("夜雨寄北(李商隐)君问归期未有期，巴山夜雨涨秋池。何当共剪西窗烛，却话巴山夜雨时。")
fillText2.SetAutoLine(false)
fillText2.SetFontSize(60)
fillText2.SetLineHeight(90)
fillText2.SetOutStr("...")
fillText2.SetOutStrPosition("left")
fillText2.SetArea(600, 0, 500, 1000)
loadImage.Fill(fillText2)

//自定义分行
fillText2 := imagedraw.NewLineText([]string{
fillText3 := imagedraw.NewLineText([]string{
"夜雨寄北",
"李商隐",
"君问归期未有期",
"巴山夜雨涨秋池",
"何当共剪西窗烛",
"却话巴山夜雨时",
})
fillText2.SetMaxLineNum(3)
fillText2.SetTextAlign("right")
fillText2.SetFontSize(60)
fillText2.SetLineHeight(90)
fillText2.SetArea(1300, 500, 500, 1000)
loadImage.Fill(fillText2)
fillText3.SetMaxLineNum(3)
fillText3.SetTextAlign("right")
fillText3.SetFontSize(60)
fillText3.SetLineHeight(90)
fillText3.SetArea(1300, 500, 500, 1000)
loadImage.Fill(fillText3)

err = loadImage.SaveAs("image2.png")
if err != nil {
Expand Down
2 changes: 1 addition & 1 deletion go.mod
View file
Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@ module github.com/yeyudekuangxiang/imagedraw
go 1.14

require (
github.com/fogleman/gg v1.3.0
github.com/fogleman/gg v1.3.0 // indirect
github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0
golang.org/x/image v0.0.0-20210628002857-a66eb6448b8d
)
199 changes: 129 additions & 70 deletions text.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -72,15 +72,15 @@ func splitText(face font.Face, s string, maxWidth float64) []SplitText {
width := Int26ToFloat(advance)

if (st.Width + width) >= maxWidth {
st.Height = st.MaxY - st.MinY
stList = append(stList, st)
st = SplitText{
Str: string(r),
Width: width,
MaxY: maxY,
MinY: minY,
Str: string(r),
Width: width,
Height: maxY - minY,
MaxY: maxY,
MinY: minY,
}
} else if i == len(runeList)-1 {
} else {
st.Width += width
st.Str += string(r)
if st.MaxY < maxY {
Expand All @@ -90,16 +90,10 @@ func splitText(face font.Face, s string, maxWidth float64) []SplitText {
st.MinY = minY
}
st.Height = st.MaxY - st.MinY
}

if i == len(runeList)-1 {
stList = append(stList, st)
} else {
st.Width += width
st.Str += string(r)
if st.MaxY < maxY {
st.MaxY = maxY
}
if st.MinY > minY {
st.MinY = minY
}
}
}
return stList
Expand Down Expand Up @@ -127,20 +121,14 @@ func str2SplitText(face font.Face, str string) SplitText {
}

//处理多行超出提示
func dealLineOut(face font.Face, list []SplitText, outStr string, maxLineNum int) []SplitText {
func dealLineOut(face font.Face, list []SplitText, outStr, outStrPosition string, maxLineNum int) []SplitText {
if maxLineNum <= 0 || len(list) <= maxLineNum {
return list
}
if len(outStr) == 0 {
return list[:maxLineNum]
}

list2 := list[:maxLineNum]

lastLine := list2[maxLineNum-1]
lastRuneList := []rune(lastLine.Str)
total := 0.00

outStrRune := []rune(outStr)
outStrWidth := 0.00
MaxY := float64(1 - 1<<16)
Expand All @@ -156,28 +144,52 @@ func dealLineOut(face font.Face, list []SplitText, outStr string, maxLineNum int
}
}

for i := len(lastRuneList) - 1; i >= 0; i-- {
advance, _ := face.GlyphAdvance(lastRuneList[i])
total += Int26ToFloat(advance)
if total >= outStrWidth {
lastRuneList = append(lastRuneList[:i], outStrRune...)
list2[maxLineNum-1].Str = string(lastRuneList)

list2[maxLineNum-1].Width = list2[maxLineNum-1].Width - total + outStrWidth
if list2[maxLineNum-1].MaxY < MaxY {
list2[maxLineNum-1].MaxY = MaxY
list2 := list[:maxLineNum]
lastLine := list2[maxLineNum-1]
lastRuneList := []rune(lastLine.Str)
total := 0.00
if outStrPosition == "left" {
for i := len(lastRuneList) - 1; i >= 0; i-- {
advance, _ := face.GlyphAdvance(lastRuneList[i])
total += Int26ToFloat(advance)
if total >= outStrWidth {
lastRuneList = append(lastRuneList[:i], outStrRune...)
list2[maxLineNum-1].Str = string(lastRuneList)

list2[maxLineNum-1].Width = list2[maxLineNum-1].Width - total + outStrWidth
if list2[maxLineNum-1].MaxY < MaxY {
list2[maxLineNum-1].MaxY = MaxY
}
if list2[maxLineNum-1].MinY > MinY {
list2[maxLineNum-1].MinY = MinY
}
break
}
if list2[maxLineNum-1].MinY > MinY {
list2[maxLineNum-1].MinY = MinY
}
} else {
for i := len(lastRuneList) - 1; i >= 0; i-- {
advance, _ := face.GlyphAdvance(lastRuneList[i])
total += Int26ToFloat(advance)
if total >= outStrWidth {
lastRuneList = append(lastRuneList[:i], outStrRune...)
list2[maxLineNum-1].Str = string(lastRuneList)

list2[maxLineNum-1].Width = list2[maxLineNum-1].Width - total + outStrWidth
if list2[maxLineNum-1].MaxY < MaxY {
list2[maxLineNum-1].MaxY = MaxY
}
if list2[maxLineNum-1].MinY > MinY {
list2[maxLineNum-1].MinY = MinY
}
break
}
break
}
}
return list2
}

//处理单行文本超出提示
func dealSingleOut(face font.Face, str SplitText, outStr string, maxWidth float64) SplitText {
func dealSingleOut(face font.Face, str SplitText, outStr, outStrPosition string, maxWidth float64) SplitText {
if str.Width <= maxWidth {
return str
}
Expand All @@ -199,6 +211,28 @@ func dealSingleOut(face font.Face, str SplitText, outStr string, maxWidth float6

strRuneList := []rune(str.Str)
total := 0.00
if outStrPosition == "left" {
for i := len(strRuneList) - 1; i >= 0; i-- {
advance, _ := face.GlyphAdvance(strRuneList[i])
w := Int26ToFloat(advance)

if total+w+outStrWidth > maxWidth {
if str.MaxY > MaxY {
MaxY = str.MaxY
}
if str.MinY < MinY {
MinY = str.MinY
}
return SplitText{
Str: outStr + string(strRuneList[i:]),
Width: total + outStrWidth,
MinY: MinY,
MaxY: MaxY,
}
}
total += w
}
}
for i := 0; i < len(strRuneList); i++ {
advance, _ := face.GlyphAdvance(strRuneList[i])
w := Int26ToFloat(advance)
Expand All @@ -218,7 +252,6 @@ func dealSingleOut(face font.Face, str SplitText, outStr string, maxWidth float6
}
}
total += w

}
return str
}
Expand All @@ -229,29 +262,34 @@ func pxToPoint(px int, dpi int) float64 {
}

type Text struct {
c *freetype.Context
fontSize int
dpi int
textAlign string
area image.Rectangle
maxLineNum int
outStr string
font *truetype.Font
color color.RGBA
lineHeight int
s string
lines []string
c *freetype.Context
fontSize int
dpi int
textAlign string
area image.Rectangle
maxLineNum int
outStr string
outStrPosition string
font *truetype.Font
color color.RGBA
lineHeight int
s string
//是否自动分行
autoLine bool
lines []string
}

func NewText(s string) *Text {
return &Text{
c: freetype.NewContext(),
fontSize: 24,
dpi: 72,
textAlign: "left",
font: DefaultFont,
color: color.RGBA{A: 255},
s: s,
c: freetype.NewContext(),
fontSize: 24,
dpi: 72,
textAlign: "left",
font: DefaultFont,
color: color.RGBA{A: 255},
s: s,
autoLine: true,
outStrPosition: "right",
}
}
func NewLineText(linesText []string) *Text {
Expand Down Expand Up @@ -305,6 +343,16 @@ func (t *Text) SetOutStr(str string) *Text {
return t
}

//设置字符串省略的位置 left左边 right右边 默认右边
func (t *Text) SetOutStrPosition(position string) *Text {
if position == "left" || position == "right" {
t.outStrPosition = position
} else {
t.outStrPosition = "right"
}
return t
}

//设置字体 默认字体思源黑体
func (t *Text) SetFont(font *truetype.Font) *Text {
t.font = font
Expand All @@ -330,6 +378,12 @@ func (t *Text) SetText(s string) *Text {
return t
}

//设置字符串文本是否自动分行 autoLine文本是否自动分行 false不自动分行 true自动分行 默认true
func (t *Text) SetAutoLine(autoLine bool) *Text {
t.autoLine = autoLine
return t
}

//自定义多行字符串 每行字符串超出后都会按照 outStr处理
func (t *Text) SetLineText(lines []string) {
t.lines = lines
Expand Down Expand Up @@ -402,18 +456,20 @@ func (t *Text) draw(dst draw.Image) draw.Image {
}
func (t *Text) Copy() *Text {
return &Text{
c: t.c,
fontSize: t.fontSize,
dpi: t.dpi,
textAlign: t.textAlign,
area: t.area,
maxLineNum: t.maxLineNum,
outStr: t.outStr,
font: t.font,
color: t.color,
lineHeight: t.lineHeight,
s: t.s,
lines: t.lines,
c: t.c,
fontSize: t.fontSize,
dpi: t.dpi,
textAlign: t.textAlign,
area: t.area,
maxLineNum: t.maxLineNum,
outStr: t.outStr,
outStrPosition: t.outStrPosition,
font: t.font,
color: t.color,
lineHeight: t.lineHeight,
s: t.s,
lines: t.lines,
autoLine: t.autoLine,
}
}
func (t *Text) deal() struct {
Expand Down Expand Up @@ -483,14 +539,17 @@ func (t *Text) dealLineText(face font.Face, maxWidth float64) []SplitText {
t.lines = t.lines[:t.maxLineNum]
}
for _, line := range t.lines {
list = append(list, dealSingleOut(face, str2SplitText(face, line), t.outStr, maxWidth))
list = append(list, dealSingleOut(face, str2SplitText(face, line), t.outStr, t.outStrPosition, maxWidth))
}
return list
}

//转换字符串
func (t Text) dealText(face font.Face, maxWidth float64) []SplitText {
return dealLineOut(face, splitText(face, t.s, maxWidth), t.outStr, t.maxLineNum)
if t.autoLine == false {
return []SplitText{dealSingleOut(face, str2SplitText(face, t.s), t.outStr, t.outStrPosition, maxWidth)}
}
return dealLineOut(face, splitText(face, t.s, maxWidth), t.outStr, t.outStrPosition, t.maxLineNum)
}

func (t *Text) Width() int {
Expand Down

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