I have the following code and want to change to print the QRCodes in multiple columns on a A4 format page:

        private int curRow = 0;
        private int curCopy = 0;        
        private void printDocument1_BeginPrint(object sender, System.Drawing.Printing.PrintEventArgs e)
        {
            curRow = 0;
            curCopy = 0;
        }
        private void printDocument1_PrintPage(object sender, PrintPageEventArgs e)
        {
            var curY = e.MarginBounds.Y;

            using (var fontNormal = new Font("Arial", 12))
            using (var sf = new StringFormat())
            {
                sf.Alignment = sf.LineAlignment = StringAlignment.Center;
                int itemHeight = (int)fontNormal.GetHeight(e.Graphics)   10;


                for (int row = curRow; row < dt.Rows.Count; row  )
                {
                    DataRow dr = dt.Rows[row];

                    if (!string.IsNullOrEmpty(dr.Field<string>(1)) &&
                        int.TryParse(dr.Field<string>(4)?.ToString(), out int copies))
                    {
                        for (int i = curCopy; i < copies; i  )
                        {
                            var imgRect = new Rectangle(e.MarginBounds.X, curY, 200, 200);
                            var labelRect = new Rectangle(
                                imgRect.X,
                                imgRect.Bottom,
                                imgRect.Width,
                                itemHeight);

                            if (curY   imgRect.Height   labelRect.Height >= e.MarginBounds.Bottom)
                            {
                                curCopy = i;
                                e.HasMorePages = true;
                                return;
                            }

                            e.Graphics.DrawImage(GenerateQRCODE(dr[1].ToString()), imgRect);
                            e.Graphics.DrawString(dr[1].ToString(),
                                fontNormal, Brushes.Black,
                                labelRect, sf);

                            curY = labelRect.Bottom   30;
                        }
                    }

                    curRow = row   1;
                    curCopy = 0;
                }
            }
            refreshprintbtn.Enabled = true;
        }

Now the print preview is the following: link to screenthot

I generate more than 50 QRCodes, so if the A4 page is full with QRCodes, I want to start a new page. The same QRCode can appear several times and is based on the dr[4] value and the dr[1] is the value for the code.

CodePudding user response：

The way you calculate the curY value to print in rows is the same way that you need to follow to calculate the x value to print in columns. Offset the x by the width of the image plus some space and break the row if the x value plus the image width is greater than the e.MarginBounds.Right value.

private int curRow = 0;
private int curCopy = 0;

private void printDocument1_BeginPrint(object sender, PrintEventArgs e)
{
    curRow = curCopy = 0;
}

private void printDocument1_PrintPage(object sender, PrintPageEventArgs e)
{
    var curX = e.MarginBounds.X;
    var curY = e.MarginBounds.Y;

    using (var fontNormal = new Font("Arial", 12))
    using (var sf = new StringFormat())
    {
        sf.Alignment = sf.LineAlignment = StringAlignment.Center;
        int itemHeight = (int)fontNormal.GetHeight(e.Graphics)   10;

        for (int row = curRow; row < dt.Rows.Count; row  )
        {
            DataRow dr = dt.Rows[row];

            if (!string.IsNullOrEmpty(dr.Field<string>(1)) &&
                int.TryParse(dr.Field<string>(4)?.ToString(), out int copies))
            {
                for (int i = curCopy; i < copies; i  )
                {
                    var imgRect = new Rectangle(curX, curY, 200, 200);
                    var labelRect = new Rectangle(
                        imgRect.X,
                        imgRect.Bottom,
                        imgRect.Width,
                        itemHeight);

                    // You should do this to dispose of the
                    // image after printing it.
                    using (var qrImage = GenerateQRCODE(dr[1].ToString()))
                        e.Graphics.DrawImage(qrImage, imgRect);
                    e.Graphics.DrawString(dr[1].ToString(),
                        fontNormal, Brushes.Black,
                        labelRect, sf);

                    curX = imgRect.Right   30;

                    if (curX   imgRect.Width > e.MarginBounds.Right)
                    {
                        curX = e.MarginBounds.X;
                        curY = labelRect.Bottom   30;
                    }

                    if (curY   imgRect.Height   labelRect.Height >= e.MarginBounds.Bottom)
                    {
                        curCopy = i   1;
                        e.HasMorePages = true;
                        return;
                    }
                }
            }

            curRow = row   1;
            curCopy = 0;
        }
    }
    refreshprintbtn.Enabled = true;
}