vb.net – 缩放图像以进行打印
发布时间:2020-12-17 07:30:04 所属栏目:百科 来源:网络整理
导读: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? 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 Pri
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? 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. (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |