我正在使用以下代码从PictureBox打印图像.
除了缩小图像(如果它们大于打印页面)以外,所有这些都很有效.
我有什么方法可以做到这一点吗？
除了缩小图像(如果它们大于打印页面)以外,所有这些都很有效.
我有什么方法可以做到这一点吗？
截图,纸张边界外的大图：
http://a.yfrog.com/img46/63/problemsh.png http://a.yfrog.com/img46/63/problemsh.png
Private Sub Button1_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button1.Click
AddHandler PrintDocument1.PrintPage,AddressOf OnPrintPage
With PageSetupDialog1
.Document = PrintDocument1
.PageSettings = PrintDocument1.DefaultPageSettings
If PictureEdit1.Image.Height >= PictureEdit1.Image.Width Then
PageSetupDialog1.PageSettings.Landscape = False
Else
PageSetupDialog1.PageSettings.Landscape = True
End If
End With
PrintDialog1.UseEXDialog = True
PrintDialog1.Document = PrintDocument1
If PrintDialog1.ShowDialog = Windows.Forms.DialogResult.OK Then
PrintPreviewDialog1.Document = PrintDocument1
If PrintPreviewDialog1.ShowDialog = Windows.Forms.DialogResult.OK Then
PrintDocument1.DefaultPageSettings = PageSetupDialog1.PageSettings
PrintDocument1.Print()
End If
End If
End Sub
Private Sub OnPrintPage(ByVal sender As Object,ByVal e As System.Drawing.Printing.PrintPageEventArgs)
Dim img As Image = PictureEdit1.Image
Dim sz As New SizeF(100 * img.Width / img.HorizontalResolution,100 * img.Height / img.VerticalResolution)
Dim p As New PointF((e.PageBounds.Width - sz.Width) / 2,(e.PageBounds.Height - sz.Height) / 2)
e.Graphics.DrawImage(img,p)
End Sub
解决方法
更换：
Dim sz As New SizeF(100 * img.Width / img.HorizontalResolution,100 * img.Height / img.VerticalResolution)
使用类似的东西来适应页面中的图像：
dim ScaleFac as integer = 100
While (ScaleFac * img.Width / img.HorizontalResolution > e.PageBounds.Width or ScaleFac * img.Height / img.VerticalResolution > e.PageBounds.Height) and ScaleFac > 2
ScaleFac -= 1
Wend
Dim sz As New SizeF(ScaleFac * img.Width / img.HorizontalResolution,ScaleFac* img.Height / img.VerticalResolution)
您可以使用代数来解决正确的scalefac,但我没有时间对其进行测试,如果您不理解我所做的事情,那么调试将会困难得多.很确定你会从仅仅代码中看到我想要做的事情！问候.