Question

我正在尝试将所有面板保存到JPG，我已经问过这个问题，但答案并不是我想要的。问题是面板有一个滚动条（没有足够的空间用于所有元素），但它不会打印面板底部的内容，只显示可见元素。

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);
}

Answer 1

当然，位图太小，使其与panel.DisplayRectangle一样大。如果您不想获取图像中的滚动条，请不要绘制面板。

Answer 2

您可以滚动面板并获取每个滚动内容的位图，然后合并位图部分吗？

    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;
    }
}

Answer 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，目前我的一个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();
}

C＃将所有可滚动的面板保存为图像

3 个答案: