323 lines
10 KiB
Go
323 lines
10 KiB
Go
package excelize
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import (
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"bytes"
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"encoding/xml"
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"errors"
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"fmt"
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"image"
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"io/ioutil"
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"os"
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"path"
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"path/filepath"
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"strconv"
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"strings"
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)
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// AddPicture provides the method to add picture in a sheet by given offset
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// (xAxis, yAxis), scale (xScale, yScale) and file path. For example:
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//
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// package main
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//
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// import (
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// "fmt"
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// "os"
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// _ "image/gif"
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// _ "image/jpeg"
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// _ "image/png"
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//
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// "github.com/Luxurioust/excelize"
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// )
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//
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// func main() {
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// xlsx := excelize.CreateFile()
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// // Insert a picture.
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// err := xlsx.AddPicture("Sheet1", "A2", "/tmp/image1.jpg", 0, 0, 1, 1)
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// // Insert a picture to sheet with scaling.
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// err = xlsx.AddPicture("Sheet1", "D2", "/tmp/image1.png", 0, 0, 0.5, 0.5)
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// // Insert a picture offset in the cell.
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// err = xlsx.AddPicture("Sheet1", "H2", "/tmp/image3.gif", 15, 10, 1, 1)
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// if err != nil {
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// fmt.Println(err)
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// os.Exit(1)
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// }
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// err = xlsx.WriteTo("/tmp/Workbook.xlsx")
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// if err != nil {
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// fmt.Println(err)
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// os.Exit(1)
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// }
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// }
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//
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func (f *File) AddPicture(sheet, cell, picture string, offsetX, offsetY int, xScale, yScale float64) error {
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var supportTypes = map[string]string{".gif": ".gif", ".jpg": ".jpeg", ".jpeg": ".jpeg", ".png": ".png"}
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var err error
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// Check picture exists first.
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if _, err = os.Stat(picture); os.IsNotExist(err) {
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return err
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}
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ext, ok := supportTypes[path.Ext(picture)]
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if !ok {
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return errors.New("Unsupported image extension")
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}
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readFile, _ := os.Open(picture)
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image, _, err := image.DecodeConfig(readFile)
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_, file := filepath.Split(picture)
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// Read sheet data.
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var xlsx xlsxWorksheet
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name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
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xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
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// Add first picture for given sheet, create xl/drawings/ and xl/drawings/_rels/ folder.
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drawingID := f.countDrawings() + 1
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pictureID := f.countMedia() + 1
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drawingXML := "xl/drawings/drawing" + strconv.Itoa(drawingID) + ".xml"
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sheetRelationshipsDrawingXML := "../drawings/drawing" + strconv.Itoa(drawingID) + ".xml"
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var drawingRID int
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if xlsx.Drawing != nil {
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// The worksheet already has a picture or chart relationships, use the relationships drawing ../drawings/drawing%d.xml.
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sheetRelationshipsDrawingXML = f.getSheetRelationshipsTargetByID(sheet, xlsx.Drawing.RID)
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drawingID, _ = strconv.Atoi(strings.TrimSuffix(strings.TrimPrefix(sheetRelationshipsDrawingXML, "../drawings/drawing"), ".xml"))
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drawingXML = strings.Replace(sheetRelationshipsDrawingXML, "..", "xl", -1)
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} else {
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// Add first picture for given sheet.
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rID := f.addSheetRelationships(sheet, SourceRelationshipDrawingML, sheetRelationshipsDrawingXML, "")
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f.addSheetDrawing(sheet, rID)
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}
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drawingRID = f.addDrawingRelationships(drawingID, SourceRelationshipImage, "../media/image"+strconv.Itoa(pictureID)+ext)
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f.addDrawing(sheet, drawingXML, cell, file, offsetX, offsetY, image.Width, image.Height, drawingRID, xScale, yScale)
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f.addMedia(picture, ext)
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f.addDrawingContentTypePart(drawingID)
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return err
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}
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// addSheetRelationships provides function to add
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// xl/worksheets/_rels/sheet%d.xml.rels by given sheet name, relationship type
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// and target.
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func (f *File) addSheetRelationships(sheet, relType, target, targetMode string) int {
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var rels = "xl/worksheets/_rels/" + strings.ToLower(sheet) + ".xml.rels"
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var sheetRels xlsxWorkbookRels
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var rID = 1
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var ID bytes.Buffer
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ID.WriteString("rId")
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ID.WriteString(strconv.Itoa(rID))
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_, ok := f.XLSX[rels]
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if ok {
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ID.Reset()
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xml.Unmarshal([]byte(f.readXML(rels)), &sheetRels)
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rID = len(sheetRels.Relationships) + 1
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ID.WriteString("rId")
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ID.WriteString(strconv.Itoa(rID))
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}
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sheetRels.Relationships = append(sheetRels.Relationships, xlsxWorkbookRelation{
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ID: ID.String(),
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Type: relType,
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Target: target,
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TargetMode: targetMode,
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})
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output, err := xml.Marshal(sheetRels)
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if err != nil {
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fmt.Println(err)
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}
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f.saveFileList(rels, string(output))
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return rID
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}
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// addSheetDrawing provides function to add drawing element to
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// xl/worksheets/sheet%d.xml by given sheet name and relationship index.
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func (f *File) addSheetDrawing(sheet string, rID int) {
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var xlsx xlsxWorksheet
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name := "xl/worksheets/" + strings.ToLower(sheet) + ".xml"
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xml.Unmarshal([]byte(f.readXML(name)), &xlsx)
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xlsx.Drawing = &xlsxDrawing{
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RID: "rId" + strconv.Itoa(rID),
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}
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output, err := xml.Marshal(xlsx)
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if err != nil {
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fmt.Println(err)
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}
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f.saveFileList(name, string(output))
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}
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// countDrawings provides function to get drawing files count storage in the
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// folder xl/drawings.
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func (f *File) countDrawings() int {
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count := 0
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for k := range f.XLSX {
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if strings.Contains(k, "xl/drawings/drawing") {
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count++
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}
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}
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return count
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}
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// addDrawing provides function to add picture by given drawingXML, xAxis,
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// yAxis, file name and relationship index. In order to solve the problem that
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// the label structure is changed after serialization and deserialization, two
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// different structures: decodeWsDr and encodeWsDr are defined.
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func (f *File) addDrawing(sheet, drawingXML, cell, file string, offsetX, offsetY, width, height, rID int, xScale, yScale float64) {
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cell = strings.ToUpper(cell)
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fromCol := string(strings.Map(letterOnlyMapF, cell))
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fromRow, _ := strconv.Atoi(strings.Map(intOnlyMapF, cell))
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row := fromRow - 1
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col := titleToNumber(fromCol)
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width = int(float64(width) * xScale)
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height = int(float64(height) * yScale)
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colStart, rowStart, _, _, colEnd, rowEnd, x2, y2 := f.positionObjectPixels(sheet, col, row, offsetX, offsetY, width, height)
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content := encodeWsDr{}
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content.WsDr.A = NameSpaceDrawingML
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content.WsDr.Xdr = NameSpaceSpreadSheetDrawing
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cNvPrID := 1
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_, ok := f.XLSX[drawingXML]
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if ok { // Append Model
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decodeWsDr := decodeWsDr{}
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xml.Unmarshal([]byte(f.readXML(drawingXML)), &decodeWsDr)
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cNvPrID = len(decodeWsDr.TwoCellAnchor) + 1
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for _, v := range decodeWsDr.TwoCellAnchor {
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content.WsDr.TwoCellAnchor = append(content.WsDr.TwoCellAnchor, &xlsxTwoCellAnchor{
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EditAs: v.EditAs,
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GraphicFrame: v.Content,
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})
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}
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}
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twoCellAnchor := xlsxTwoCellAnchor{}
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twoCellAnchor.EditAs = "oneCell"
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from := xlsxFrom{}
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from.Col = colStart
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from.ColOff = offsetX * EMU
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from.Row = rowStart
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from.RowOff = offsetY * EMU
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to := xlsxTo{}
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to.Col = colEnd
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to.ColOff = x2 * EMU
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to.Row = rowEnd
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to.RowOff = y2 * EMU
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twoCellAnchor.From = &from
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twoCellAnchor.To = &to
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pic := xlsxPic{}
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pic.NvPicPr.CNvPicPr.PicLocks.NoChangeAspect = false
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pic.NvPicPr.CNvPr.ID = cNvPrID
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pic.NvPicPr.CNvPr.Descr = file
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pic.NvPicPr.CNvPr.Name = "Picture " + strconv.Itoa(cNvPrID)
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pic.BlipFill.Blip.R = SourceRelationship
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pic.BlipFill.Blip.Embed = "rId" + strconv.Itoa(rID)
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pic.SpPr.PrstGeom.Prst = "rect"
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twoCellAnchor.Pic = &pic
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twoCellAnchor.ClientData = &xlsxClientData{
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FLocksWithSheet: false,
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FPrintsWithSheet: false,
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}
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content.WsDr.TwoCellAnchor = append(content.WsDr.TwoCellAnchor, &twoCellAnchor)
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output, err := xml.Marshal(content)
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if err != nil {
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fmt.Println(err)
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}
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// Create replacer with pairs as arguments and replace all pairs.
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r := strings.NewReplacer("<encodeWsDr>", "", "</encodeWsDr>", "")
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result := r.Replace(string(output))
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f.saveFileList(drawingXML, result)
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}
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// addDrawingRelationships provides function to add image part relationships in
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// the file xl/drawings/_rels/drawing%d.xml.rels by given drawing index,
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// relationship type and target.
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func (f *File) addDrawingRelationships(index int, relType string, target string) int {
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var rels = "xl/drawings/_rels/drawing" + strconv.Itoa(index) + ".xml.rels"
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var drawingRels xlsxWorkbookRels
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var rID = 1
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var ID bytes.Buffer
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ID.WriteString("rId")
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ID.WriteString(strconv.Itoa(rID))
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_, ok := f.XLSX[rels]
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if ok {
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ID.Reset()
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xml.Unmarshal([]byte(f.readXML(rels)), &drawingRels)
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rID = len(drawingRels.Relationships) + 1
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ID.WriteString("rId")
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ID.WriteString(strconv.Itoa(rID))
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}
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drawingRels.Relationships = append(drawingRels.Relationships, xlsxWorkbookRelation{
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ID: ID.String(),
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Type: relType,
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Target: target,
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})
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output, err := xml.Marshal(drawingRels)
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if err != nil {
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fmt.Println(err)
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}
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f.saveFileList(rels, string(output))
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return rID
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}
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// countMedia provides function to get media files count storage in the folder
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// xl/media/image.
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func (f *File) countMedia() int {
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count := 0
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for k := range f.XLSX {
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if strings.Contains(k, "xl/media/image") {
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count++
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}
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}
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return count
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}
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// addMedia provides function to add picture into folder xl/media/image by given
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// file name and extension name.
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func (f *File) addMedia(file string, ext string) {
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count := f.countMedia()
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dat, _ := ioutil.ReadFile(file)
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media := "xl/media/image" + strconv.Itoa(count+1) + ext
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f.XLSX[media] = string(dat)
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}
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// addDrawingContentTypePart provides function to add image part relationships
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// in http://purl.oclc.org/ooxml/officeDocument/relationships/image and
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// appropriate content type.
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func (f *File) addDrawingContentTypePart(index int) {
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var imageTypes = map[string]bool{"jpeg": false, "png": false, "gif": false}
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var content xlsxTypes
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xml.Unmarshal([]byte(f.readXML(`[Content_Types].xml`)), &content)
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for _, v := range content.Defaults {
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_, ok := imageTypes[v.Extension]
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if ok {
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imageTypes[v.Extension] = true
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}
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}
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for k, v := range imageTypes {
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if !v {
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content.Defaults = append(content.Defaults, xlsxDefault{
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Extension: k,
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ContentType: "image/" + k,
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})
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}
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}
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for _, v := range content.Overrides {
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if v.PartName == "/xl/drawings/drawing"+strconv.Itoa(index)+".xml" {
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output, _ := xml.Marshal(content)
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f.saveFileList(`[Content_Types].xml`, string(output))
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return
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}
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}
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content.Overrides = append(content.Overrides, xlsxOverride{
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PartName: "/xl/drawings/drawing" + strconv.Itoa(index) + ".xml",
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ContentType: "application/vnd.openxmlformats-officedocument.drawing+xml",
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})
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output, _ := xml.Marshal(content)
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f.saveFileList(`[Content_Types].xml`, string(output))
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}
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// getSheetRelationshipsTargetByID provides function to get Target attribute
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// value in xl/worksheets/_rels/sheet%d.xml.rels by given sheet name and
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// relationship index.
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func (f *File) getSheetRelationshipsTargetByID(sheet string, rID string) string {
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var rels = "xl/worksheets/_rels/" + strings.ToLower(sheet) + ".xml.rels"
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var sheetRels xlsxWorkbookRels
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xml.Unmarshal([]byte(f.readXML(rels)), &sheetRels)
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for _, v := range sheetRels.Relationships {
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if v.ID == rID {
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return v.Target
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}
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}
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return ""
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}
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