保存图形内容到一个文件 [英] Saving a Graphics content to a file

问题描述

我有一些code其中我绘制函数图形成图片框图形。在code在油漆事件来实现。在某些时候我想保存的图形在一个文件中的内容的位图。

I have some code where I draw a function graph into a PictureBox graphics. The code is implemented in the Paint event. At some point I want to save a bitmap of the content of the graphics in a file.

我已经读了答案这个问题和没T找到了我一直在寻找。

I already read the answers to this question, and didn't found what I was looking for.

我需要的都在图片框绘制（或您提出任何其他控制）是为了让我不松绘图时控制隐藏什么（所以我认为我不能的createGraphics（））的和的能够保存图形中的按钮的单击事件。

What I need is both to draw in the PictureBox (or any other control that you suggest) so that I don't loose the drawing when the control is hidden or something (so I think I cannot CreateGraphics()) and be able to save that drawing in a button's click event.

我愿意把图纸逻辑出了油漆事件如果necesary。

I'm willing to put the drawing logic out of the Paint event if necesary.

先谢谢了。

推荐答案

我继续回答了基于我的假设的问题，

I went ahead and answered the question based on my assumption,

我创建了一个新的的WinForms 应用

我添加了一个面板和按钮
我创建了一个位图名为缓存，而在 Form1中构造，它初始化为面板的尺寸。而不是直接绘制到面板的，我画到位图，然后设置面板背景图片缓存;这将增加持久性，以您的图形。如果你真的想写入一个文件，我可以告诉你这一点。只要问。

I added a panel and a button I created a Bitmap named buffer, and in the Form1 constructor, initialized it to the size of the panel. Instead of drawing directly to the panel, I draw to the Bitmap, then set the panels background image buffer; This will add persistance to your graphics. If you truly wish to write to a file, I can show you that. Just ask.

要写入文件，你需要这个命名空间参考：

To write to file you will need this namespace reference :

using System.IO;

我说你问的 ImageToDisc 功能。

的这里是code：的

Bitmap buffer;
public Form1()
{
    InitializeComponent();
    panel1.BorderStyle = BorderStyle.FixedSingle;
    buffer = new Bitmap(panel1.Width,panel1.Height);
}

private void button1_Click(object sender, EventArgs e)
{
    using (Graphics g = Graphics.FromImage(buffer))
    {
        g.DrawRectangle(Pens.Red, 100, 100,100,100);
    }

    panel1.BackgroundImage = buffer;
    //writes the buffer Bitmap to a binary file, only neccessary if you want to save to disc
    ImageToDisc();
    //just to prove that it did write it to file and can be loaded I set the mainforms background image to the file
    this.BackgroundImage=FileToImage();
}

//Converts the image to a byte[] and writes it to disc
public void ImageToDisc()
{
    ImageConverter converter = new ImageConverter();
    File.WriteAllBytes(@"c:\test.dat", (byte[])converter.ConvertTo(buffer, typeof(byte[])));
}

//Converts the image from disc to an image
public Bitmap FileToImage()
{
    ImageConverter converter = new ImageConverter();
    return (Bitmap)converter.ConvertFrom(File.ReadAllBytes(@"c:\test.dat"));
}

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