调整面板大小以打印整页 [英] Resize Panel To Print Full Page

问题描述

我在 tabcontrolpanel 上有一个面板，约占屏幕的 35%.我正在打印面板，它打印出屏幕上的确切尺寸.是否可以在 C# 和 winforms 中缩放图像以在 8.5x11 纸张上打印(即使我必须横向打印)?

I have a panel on a tabcontrolpanel that takes up roughly 35% of the screen. I am printing the panel, and it prints the exact size it is on the screen. Is it possible in C# and winforms to scale the image to print on a 8.5x11 peice of paper (even if I have to print it landscape)?

这是我当前的代码 --

This is my current code --

private void btnPrint_Click(object sender, EventArgs e)
{
    PrintDocument doc = new PrintDocument();
    doc.PrintPage += new SPrintPageEventHandler(doc_PrintPage);
    doc.Print();
}

private void doc_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
    Bitmap image = new Bitmap(panelToPrint.Width, panelToPrint.Height, panelToPrint.CreateGraphics());
    panelToPrint.DrawToBitmap(image, new Rectangle(0, 0, panelToPrint.Width, panelToPrint.Height));
    RectangleF bounds = e.PageSettings.PrintableArea;
    float factor = ((float)image.Height / (float)image.Width);
    e.Graphics.DrawImage(image, bounds.Left, bounds.Top, bounds.Width, factor * bounds.Width);
}

编辑
我尝试将语法修改为默认以横向模式打印，但我仍然得到与以前相同的输出，只是图像打印在页面的前 15% 处

Edit
I tried to modify my syntax to by default print in landscape mode, but I am still getting the same output as before, just the image printing roughly on the top 15% of the page

private void btnPrint_Click(object sender, EventArgs e)
    {
        System.Drawing.Printing.PrintDocument doc = new System.Drawing.Printing.PrintDocument();
        doc.DefaultPageSettings.Landscape = true;
        PrintDialog pdi = new PrintDialog();
        pdi.Document = doc;
        if (pdi.ShowDialog() == DialogResult.OK)
        {
            doc.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(doc_PrintPage);
            doc.Print();
        }
        else
        {
            MessageBox.Show("User cancelled the print job");
        }
    }

    private void doc_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
    {
        Bitmap image = new Bitmap(panelToPrint.Width, panelToPrint.Height, panelToPrint.CreateGraphics());
        panelToPrint.DrawToBitmap(image, new Rectangle(0, 0, panelToPrint.Width, panelToPrint.Height));
        RectangleF bounds = e.PageSettings.PrintableArea;
        float factor = ((float)image.Height / (float)image.Width);
        e.Graphics.DrawImage(image, bounds.Left, bounds.Top, bounds.Width, factor * bounds.Width);
    }

推荐答案

control.DrawToBitmap 正是如此.它将control(如您在屏幕上看到的)打印到位图.如果你想以不同的尺寸打印它，你必须在打印前调整面板的大小.

control.DrawToBitmap does exactly that. It prints the control (as you see it on the screen) to a bitmap. If you want to print it in a different size you have to resize the panel before printing.

更好的方法是使用DrawString等图形方法将面板中包含的数据直接绘制到页面上.

A better approach is to draw your data that is contained into the panel directly to the page using graphics methods like DrawString etc.

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