protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
// set to QR bill only, i.e. 210 by 105 mm
OutputSize savedOutputSize = Bill.Format.OutputSize;
Bill.Format.OutputSize = OutputSize.QrBillOnly;
// find smaller dimension
float scale = MathF.Min(Size.Width / 210f, Size.Height / 105f);
float xPadding = (Size.Width - scale * 210f) / 2f;
float yPadding = (Size.Height - scale * 105f) / 2f;
// draw white background
RectangleF billBounds = new RectangleF(xPadding, yPadding, scale * 210f, scale * 105f);
e.Graphics.FillRectangle(Brushes.White, billBounds);
// draw QR bill
using SystemDrawingCanvas canvas = new SystemDrawingCanvas(e.Graphics, xPadding, Size.Height - yPadding, scale, "Arial");
try
{
QRBill.Draw(Bill, canvas);
}
catch (QRBillValidationException)
{
// ignore invalid bill data
}
Bill.Format.OutputSize = savedOutputSize;
}
private void PrintQRBill(PrintPageEventArgs e)
{
// ouput size for QR bill: 210 x 297mm
bill.Format.OutputSize = OutputSize.A4PortraitSheet;
// print QR bill at bottom of page
e.Graphics.PageUnit = GraphicsUnit.Millimeter;
using SystemDrawingCanvas canvas = new SystemDrawingCanvas(e.Graphics, 0, 297, 1, "Arial");
QRBill.Draw(bill, canvas);
}
