EPPlus detect image aspect ratio - epplus

Question

I am working with EPPlus and try to place a image into B1 cell. I found a nice post which show how to detect aspect ratio and set size for image accordingly.
I saw his code but still few things are not clear. here is code taken from https://stackoverflow.com/a/54941008/15940620
public static void CreatePicture(ExcelWorksheet worksheet, string name, Image image, int firstColumn, int lastColumn, int firstRow, int lastRow, int defaultOffsetPixels)
{
int columnWidth = GetWidthInPixels(worksheet.Cells[firstRow, firstColumn]);
int rowHeight = GetHeightInPixels(worksheet.Cells[firstRow, firstColumn]);
int totalColumnWidth = columnWidth * (lastColumn - firstColumn + 1);
int totalRowHeight = rowHeight * (lastRow - firstRow + 1);
double cellAspectRatio = Convert.ToDouble(totalColumnWidth) / Convert.ToDouble(totalRowHeight);
int imageWidth = image.Width;
int imageHeight = image.Height;
double imageAspectRatio = Convert.ToDouble(imageWidth) / Convert.ToDouble(imageHeight);
int pixelWidth;
int pixelHeight;
if (imageAspectRatio > cellAspectRatio)
{
pixelWidth = totalColumnWidth - defaultOffsetPixels * 2;
pixelHeight = pixelWidth * imageHeight / imageWidth;
}
else
{
pixelHeight = totalRowHeight - defaultOffsetPixels * 2;
pixelWidth = pixelHeight * imageWidth / imageHeight;
}
int rowOffsetPixels = (totalRowHeight - pixelHeight) / 2;
int columnOffsetPixels = (totalColumnWidth - pixelWidth) / 2;
int rowOffsetCount = 0;
int columnOffsetCount = 0;
if (rowOffsetPixels > rowHeight)
{
rowOffsetCount = (int)Math.Floor(Convert.ToDouble(rowOffsetPixels) / Convert.ToDouble(rowHeight));
rowOffsetPixels -= rowHeight * rowOffsetCount;
}
if (columnOffsetPixels > columnWidth)
{
columnOffsetCount = (int)Math.Floor(Convert.ToDouble(columnOffsetPixels) / Convert.ToDouble(columnWidth));
columnOffsetPixels -= columnWidth * columnOffsetCount;
}
int row = firstRow + rowOffsetCount - 1;
int column = firstColumn + columnOffsetCount - 1;
ExcelPicture pic = worksheet.Drawings.AddPicture(name, image);
pic.SetPosition(row, rowOffsetPixels, column, columnOffsetPixels);
pic.SetSize(pixelWidth, pixelHeight);
}
public static int GetHeightInPixels(ExcelRange cell)
{
using (Graphics graphics = Graphics.FromHwnd(IntPtr.Zero))
{
float dpiY = graphics.DpiY;
return (int)(cell.Worksheet.Row(cell.Start.Row).Height * (1 / 72.0) * dpiY);
}
}
public static float MeasureString(string s, Font font)
{
using (var g = Graphics.FromHwnd(IntPtr.Zero))
{
g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
return g.MeasureString(s, font, int.MaxValue, StringFormat.GenericTypographic).Width;
}
}
public static int GetWidthInPixels(ExcelRange cell)
{
double columnWidth = cell.Worksheet.Column(cell.Start.Column).Width;
Font font = new Font(cell.Style.Font.Name, cell.Style.Font.Size, FontStyle.Regular);
double pxBaseline = Math.Round(MeasureString("1234567890", font) / 10);
return (int)(columnWidth * pxBaseline);
}
int firstColumn, int lastColumn, int firstRow, int lastRow, int defaultOffsetPixels
I like to know what will be the value for firstColumn
I like to know what will be the value for lastColumn
I like to know what will be the value for firstRow
I like to know what will be the value for lastRow
I like to know what will be the value for defaultOffsetPixels
Anyone can guide me how to calculate values for above points.
Regarding the points 1 to 4 can i use the below code to get first, last row and first column and last column ?
var start = workSheet.Dimension.Start;
var end = workSheet.Dimension.End;
int startrow = start.Row;
int endrow = end.Row;
int startcol = start.Column
int endcol = end.Column
OR should i use these code to get first, last row and first and last column ? please suggest.
int numRow = worksheet.Dimension.Rows;
int numCol = worksheet.Dimension.Columns;
string lastAddress = worksheet.Dimension.Address.Last().ToString();
How to calculate defaultOffsetPixels ?
Thanks

Answer 1

Well,firstColumn，lastColumn，firstRow，lastRow，defaultOffsetPixels is incoming Parameter。I have an example of how it works，I hope it helps
Image image = Image.FromStream(new MemoryStream(drs[0]["Image"] as byte[]));
EPPlusPicture.CreatePicture(worksheet, Guid.NewGuid().ToString(), image, col, col, firstRow, lastRow, 5);