Merge pull request qax-os#410

picture.go

@@ -32,6 +32,7 @@ func parseFormatPictureSet(formatSet string) (*formatPicture, error) {
 		FPrintsWithSheet: true,
 		FLocksWithSheet:  false,
 		NoChangeAspect:   false,
+		Autofit:          false,
 		OffsetX:          0,
 		OffsetY:          0,
 		XScale:           1.0,
@@ -244,8 +245,12 @@ func (f *File) addDrawingPicture(sheet, drawingXML, cell, file string, width, he
 	if err != nil {
 		return err
 	}
-	width = int(float64(width) * formatSet.XScale)
-	height = int(float64(height) * formatSet.YScale)
+	if formatSet.Autofit {
+		width, height, col, row, err = f.drawingResize(sheet, cell, float64(width), float64(height), formatSet)
+		if err != nil {
+			return err
+		}
+	}
 	col--
 	row--
 	colStart, rowStart, _, _, colEnd, rowEnd, x2, y2 :=
@@ -578,3 +583,47 @@ func (f *File) drawingsWriter() {
 		}
 	}
 }
+
+// drawingResize calculate the height and width after resizing.
+func (f *File) drawingResize(sheet string, cell string, width, height float64, formatSet *formatPicture) (w, h, c, r int, err error) {
+	var mergeCells []MergeCell
+	mergeCells, err = f.GetMergeCells(sheet)
+	if err != nil {
+		return
+	}
+	var rng []int
+	var inMergeCell bool
+	if c, r, err = CellNameToCoordinates(cell); err != nil {
+		return
+	}
+	cellWidth, cellHeight := f.getColWidth(sheet, c), f.getRowHeight(sheet, r)
+	for _, mergeCell := range mergeCells {
+		if inMergeCell, err = f.checkCellInArea(cell, mergeCell[0]); err != nil {
+			return
+		}
+		if inMergeCell {
+			rng, _ = areaRangeToCoordinates(mergeCell.GetStartAxis(), mergeCell.GetEndAxis())
+			sortCoordinates(rng)
+		}
+	}
+	if inMergeCell {
+		c, r = rng[0], rng[1]
+		for col := rng[0] - 1; col < rng[2]; col++ {
+			cellWidth += f.getColWidth(sheet, col)
+		}
+		for row := rng[1] - 1; row < rng[3]; row++ {
+			cellHeight += f.getRowHeight(sheet, row)
+		}
+	}
+	if float64(cellWidth) < width {
+		asp := float64(cellWidth) / width
+		width, height = float64(cellWidth), height*asp
+	}
+	if float64(cellHeight) < height {
+		asp := float64(cellHeight) / height
+		height, width = float64(cellHeight), width*asp
+	}
+	width, height = width-float64(formatSet.OffsetX), height-float64(formatSet.OffsetY)
+	w, h = int(width*formatSet.XScale), int(height*formatSet.YScale)
+	return
+}

picture_test.go

@@ -47,6 +47,15 @@ func TestAddPicture(t *testing.T) {
 	file, err := ioutil.ReadFile(filepath.Join("test", "images", "excel.png"))
 	assert.NoError(t, err)
 
+	// Test add picture to worksheet with autofit.
+	assert.NoError(t, f.AddPicture("Sheet1", "A30", filepath.Join("test", "images", "excel.jpg"), `{"autofit": true}`))
+	assert.NoError(t, f.AddPicture("Sheet1", "B30", filepath.Join("test", "images", "excel.jpg"), `{"x_offset": 10, "y_offset": 10, "autofit": true}`))
+	f.NewSheet("AddPicture")
+	assert.NoError(t, f.SetRowHeight("AddPicture", 10, 30))
+	assert.NoError(t, f.MergeCell("AddPicture", "B3", "D9"))
+	assert.NoError(t, f.AddPicture("AddPicture", "C6", filepath.Join("test", "images", "excel.jpg"), `{"autofit": true}`))
+	assert.NoError(t, f.AddPicture("AddPicture", "A1", filepath.Join("test", "images", "excel.jpg"), `{"autofit": true}`))
+
 	// Test add picture to worksheet from bytes.
 	assert.NoError(t, f.AddPictureFromBytes("Sheet1", "Q1", "", "Excel Logo", ".png", file))
 	// Test add picture to worksheet from bytes with illegal cell coordinates.
@@ -181,3 +190,15 @@ func TestDeletePicture(t *testing.T) {
 	// Test delete picture on no chart worksheet.
 	assert.NoError(t, NewFile().DeletePicture("Sheet1", "A1"))
 }
+
+func TestDrawingResize(t *testing.T) {
+	f := NewFile()
+	// Test calculate drawing resize on not exists worksheet.
+	_, _, _, _, err := f.drawingResize("SheetN", "A1", 1, 1, nil)
+	assert.EqualError(t, err, "sheet SheetN is not exist")
+	// Test calculate drawing resize with invalid coordinates.
+	_, _, _, _, err = f.drawingResize("Sheet1", "", 1, 1, nil)
+	assert.EqualError(t, err, `cannot convert cell "" to coordinates: invalid cell name ""`)
+	f.Sheet["xl/worksheets/sheet1.xml"].MergeCells = &xlsxMergeCells{Cells: []*xlsxMergeCell{{Ref: "A:A"}}}
+	assert.EqualError(t, f.AddPicture("Sheet1", "A1", filepath.Join("test", "images", "excel.jpg"), `{"autofit": true}`), `cannot convert cell "A" to coordinates: invalid cell name "A"`)
+}

rows.go

@@ -148,7 +148,8 @@ func (err ErrSheetNotExist) Error() string {
 	return fmt.Sprintf("sheet %s is not exist", string(err.SheetName))
 }
 
-// Rows return a rows iterator. For example:
+// Rows returns a rows iterator, used for streaming reading data for a
+// worksheet with a large data. For example:
 //
 //    rows, err := f.Rows("Sheet1")
 //    if err != nil {

xmlDrawing.go

@@ -419,6 +419,7 @@ type formatPicture struct {
 	FPrintsWithSheet bool    `json:"print_obj"`
 	FLocksWithSheet  bool    `json:"locked"`
 	NoChangeAspect   bool    `json:"lock_aspect_ratio"`
+	Autofit          bool    `json:"autofit"`
 	OffsetX          int     `json:"x_offset"`
 	OffsetY          int     `json:"y_offset"`
 	XScale           float64 `json:"x_scale"`