Question

我正在使用WinForms。在我的表格中，我得到了一个picuturebox和4个文本框margin_top，margin_bottom，margin_left和margin_right。我希望能够为打印预览对话框中显示的图像创建边距，但我还想在提供边距时按比例缩放图像。我还希望将图像包含在打印预览页面中，这意味着没有图像剪切。另一个问题是，当打印预览页面与我的图像大小相同时，为什么我的图像会被切割？我使用了850宽度乘1100高度的图像，当我点击打印预览图像时，它被切断，而我不必重新调整尺寸。

以下是您可以测试的图片的链接。

http://www.filedropper.com/850x1100

下面是在打印预览屏幕中无法正确显示的图像。它缺少右边界和右边界。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Printing_Image_Center
{
   public partial class Form1 : Form
   {
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        pictureBox1.Image = new Bitmap(@"C:\Users\Bob\Pictures\850x1100.png");
    }

    private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
    {

        var img_width = e.PageBounds.Width - e.MarginBounds.Left - Math.Abs(e.MarginBounds.Right - e.PageBounds.Width);
        var img_height = e.PageBounds.Height - e.MarginBounds.Top - Math.Abs(e.MarginBounds.Bottom - e.PageBounds.Height);

        e.Graphics.DrawImage(ResizeAcordingToImage(pictureBox1.Image, img_width, img_height),
            e.MarginBounds.Left, e.MarginBounds.Top);
    }

    private void Btn_Print_Click(object sender, EventArgs e)
    {
        printPreviewDialog1.Document = printDocument1;

        //PrintDocument.OriginAtMargins = true;
        printDocument1.DefaultPageSettings.Margins.Top = Convert.ToInt32(txt_Top.Text);
        printDocument1.DefaultPageSettings.Margins.Left = Convert.ToInt32(txt_Left.Text);
        printDocument1.DefaultPageSettings.Margins.Right = Convert.ToInt32(txt_Right.Text);
        printDocument1.DefaultPageSettings.Margins.Bottom = Convert.ToInt32(txt_bottom.Text);

        printPreviewDialog1.ShowDialog();
    }


    private Image ResizeAcordingToImage(Image Source, int boxWidth, int boxHeight)
    {
        Image resizedImage;
        double dbl = (double)Source.Width / (double)Source.Height;
        //set height of image to boxHeight and check if resulting width is less than boxWidth, 
        //else set width of image to boxWidth and calculate new height
        if ((int)((double)boxHeight * dbl) <= boxWidth)
        {
            resizedImage = new Bitmap(Source, (int)((double)boxHeight * dbl), boxHeight);
        }
        else
        {
            resizedImage = new Bitmap(Source, boxWidth, (int)((double)boxWidth / dbl));
        }

        return resizedImage;

    }
}
}

Answer 1

请在代码中提供img.width和img.height的值以解决问题。这是你唯一缺少的东西。

var img = ResizeAcordingToImage(pictureBox1.Image, img_width, img_height);

e.Graphics.DrawImage(img, e.MarginBounds.Left, e.MarginBounds.Top, img.Width, img.Height);

以下是更改后的结果：

在保持图像C的纵横比的同时打印带边距＃

1 个答案: