C#将所有可滚动面板保存为图像

Posted 2023-05-07

【中文标题】C#将所有可滚动面板保存为图像

【英文标题】：C# Save all of scrollable Panel as Image

【发布时间】：2011-05-14 12:40:55

【问题描述】：

我正在尝试将所有面板保存为 JPG，我已经问过这个问题，但答案不是我想要的。问题是面板有一个滚动条（没有足够的空间容纳所有元素），但它不打印面板底部的内容，只打印可见元素。

public void DrawControl(Control control,Bitmap bitmap)

    control.DrawToBitmap(bitmap,control.Bounds);
    foreach (Control childControl in control.Controls)
    
        DrawControl(childControl,bitmap);
    


public void SaveBitmap()

    Bitmap bmp = new Bitmap(this.panel1.Width, this.panel.Height);

    this.panel.DrawToBitmap(bmp, new Rectangle(0, 0, this.panel.Width, this.panel.Height));
    foreach (Control control in panel1.Controls)
    
        DrawControl(control, bmp);
    

    bmp.Save("d:\\panel.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);

【参考方案1】：

您可以滚动面板并获取每个滚动内容的位图，然后合并位图部分？

    public void SaveBitmap(System.Windows.Forms.Panel CtrlToSave, string fileName)
    
        Point oldPosition = new Point(this.HorizontalScroll.Value, this.VerticalScroll.Value);

        CtrlToSave.PerformLayout();

        ComposedImage ci = new ComposedImage(new Size(CtrlToSave.DisplayRectangle.Width, CtrlToSave.DisplayRectangle.Height));

        int visibleWidth = CtrlToSave.Width - (CtrlToSave.VerticalScroll.Visible ? SystemInformation.VerticalScrollBarWidth : 0);
        int visibleHeightBuffer = CtrlToSave.Height - (CtrlToSave.HorizontalScroll.Visible ? SystemInformation.HorizontalScrollBarHeight : 0);

        //int Iteration = 0;

        for (int x = CtrlToSave.DisplayRectangle.Width-visibleWidth; x >= 0 ; x -= visibleWidth)
                       

            int visibleHeight = visibleHeightBuffer;

            for (int y = CtrlToSave.DisplayRectangle.Height-visibleHeight; y >= 0 ; y -= visibleHeight)
            
                CtrlToSave.HorizontalScroll.Value = x;
                CtrlToSave.VerticalScroll.Value = y;

                CtrlToSave.PerformLayout();

                Bitmap bmp = new Bitmap(visibleWidth, visibleHeight);

                CtrlToSave.DrawToBitmap(bmp, new Rectangle(0, 0, visibleWidth, visibleHeight));
                ci.images.Add(new ImagePart(new Point(x,y),bmp));

                ///Show image parts
                //using (Graphics grD = Graphics.FromImage(bmp))
                //
                //    Iteration++;
                //    grD.DrawRectangle(Pens.Blue,new Rectangle(0,0,bmp.Width-1,bmp.Height-1));
                    //grD.DrawString("x:"+x+",y:"+y+",W:"+visibleWidth+",H:"+visibleHeight + " I:" + Iteration,new Font("Segoe UI",9f),Brushes.Red,new Point(2,2));                        
                //

                if (y - visibleHeight < (CtrlToSave.DisplayRectangle.Height % visibleHeight))
                    visibleHeight = CtrlToSave.DisplayRectangle.Height % visibleHeight;

                if (visibleHeight == 0)
                    break;
            

            if (x - visibleWidth < (CtrlToSave.DisplayRectangle.Width % visibleWidth))
                visibleWidth = CtrlToSave.DisplayRectangle.Width % visibleWidth;                
            if (visibleWidth == 0)
                break;
        

        Bitmap img = ci.composeImage();
        img.Save(fileName, System.Drawing.Imaging.ImageFormat.Png);

        CtrlToSave.HorizontalScroll.Value = oldPosition.X;
        CtrlToSave.VerticalScroll.Value = oldPosition.Y;
    



public class ComposedImage

    public Size dimensions;
    public List<ImagePart> images;

    public ComposedImage(Size dimensions)
    
        this.dimensions = dimensions;
        this.images = new List<ImagePart>();
    

    public ComposedImage(Size dimensions, List<ImagePart> images)
    
        this.dimensions = dimensions;
        this.images = images;
    

    public Bitmap composeImage()
    
        if (dimensions == null || images == null)
            return null;

        Bitmap fullbmp = new Bitmap(dimensions.Width, dimensions.Height);
        using (Graphics grD = Graphics.FromImage(fullbmp))
        
            foreach (ImagePart bmp in images)
            
                grD.DrawImage(bmp.image, bmp.location.X, bmp.location.Y);
            
        
        return fullbmp;
    


public class ImagePart

    public Point location;
    public Bitmap image;

    public ImagePart(Point location, Bitmap image)
    
        this.location = location;
        this.image = image;
    

【讨论】：

这对我来说很有效，我的用例有一个小模组。

【参考方案2】：

位图当然太小了，让它和panel.DisplayRectangle一样大。如果您不想在图像中获取滚动条，请不要绘制面板。

【参考方案3】：

我意识到这是一个旧线程，但我找到了一种更简单的方法来将单个面板的内容保存为图像。这适用于单个面板，目前我的一份报告使用这种方法打印到 1560 x 6043。

private void button2_Click(object sender, EventArgs e)


    panel1.AutoSize = true;
    panel1.Refresh();

    using (Bitmap bmp = new Bitmap(panel1.Width, panel1.Height))
    

       panel1.DrawToBitmap(bmp, new Rectangle(Point.Empty, bmp.Size));
       string fileName = "Full_Domain_Report_" + DateTime.Now.ToString("yyyy-MM-dd_HH_mm_ss") + ".png";       
       bmp.Save(@"C:\temp\" + fileName, ImageFormat.Png); // make sure path exists!

    

    panel1.AutoSize = false;
    panel1.Refresh();

【讨论】：

问题要求滚动面板，但它只保存可见区域。