[英]How to print a group box using print preview?
下面的代码在打印预览中向我显示了组框的一半:
private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e) {
// Bitmap bmp = new Bitmap(groupBox1.ClientRectangle.Width, groupBox1.ClientRectangle.Height);
// groupBox1.DrawToBitmap(bmp, groupBox1.ClientRectangle);
// e.Graphics.DrawImage(bmp, 0, 0);
Bitmap bmp = new Bitmap(groupBox1.Width, groupBox1.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
groupBox1.DrawToBitmap(bmp, new Rectangle(0, 0, groupBox1.Width, groupBox1.Height));
e.Graphics.DrawImage((Image) bmp, 0, 0);
}
private void button1_Click(object sender, EventArgs e) {
PrintPreviewDialog ppd = new PrintPreviewDialog();
PrintDocument Pd = new PrintDocument();
Pd.PrintPage += this.printDocument1_PrintPage;
ppd.Document = Pd;
ppd.ShowDialog();
}
您需要在页面边界内绘制。
private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
var g = e.Graphics;
var srcRect = new Rectangle(0, 0, groupBox1.Width, groupBox1.Height);
var desRect = new Rectangle(e.PageBounds.X, e.PageBounds.Y, e.PageBounds.Width, srcRect.Height);
//Or to draw within the margin
//var desRect = new Rectangle(e.MarginBounds.X, e.MarginBounds.Y, e.MarginBounds.Width, srcRect.Height);
using (var bmp = new Bitmap(srcRect.Width, srcRect.Height))
{
groupBox1.DrawToBitmap(bmp, srcRect);
g.DrawImage(bmp, desRect, srcRect, GraphicsUnit.Pixel);
}
}
此外,创建PrintDocument
对象并在 Form 的构造函数或Load
事件中注册其PrintPage
事件,以避免在button1_Click
事件中一次又一次地重复。 并且不要忘记处理一次性物品。
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