另存为图像文件 [英] Saving as Image File

问题描述

我有一个drawCircuit按钮，单击它可以在面板上绘制一个电路图.还有一个带有saveDialogbox的Save菜单.我想将此电路图保存为面板上的图像文件.在面板的绘画事件中.
请帮助我另存为图像文件.

I have a drawCircuit button,when click it,it draws a cicuit diagram on a panel.And I also have a Save menu with saveDialogbox.I want to save this circuitdiagram on the panel as an image file.The diagrm is drawn in the panel''s paint event.
Please help me to save as an image file.

推荐答案

在面板上绘制电路图时，您使用了PaintEventArgs参数中传递的Graphics对象. .

如果研究PrintDocument类，您会看到OnPrintPage(System.Drawing.Printing.PrintPageEventArgs e)
方法还会在其PrintPageEventArgse参数中传递一个Graphics对象.因此，如果使用此Graphics对象执行相同的操作，则将绘制到打印机而不是面板上.

启用两者的最简单方法是将代码从绘制处理程序中提取到接受Graphics对象作为参数的新方法中.像

When you draw the circuit diagram on the Panel you used the Graphics object passed in the PaintEventArgs parameter.

If you research the PrintDocument class you will see that the OnPrintPage(System.Drawing.Printing.PrintPageEventArgs e)
method also passes a Graphics object in its PrintPageEventArgse parameter. Therefore if you perform the same operations using this Graphics object you will draw to the printer rather than the panel.

The easiest way to enable both is to extract the code from your paint handler into a new method that accepts a Graphics object as a prameter. Something like

private void DrawDiagram(Graphics gr)
{
  .........................
  // your drawing code here
  .........................
}

以下是有关打印的几篇文章，可帮助您入门.

使用CSharp打印 [使用C#打印 [

Here are a couple of articles about printing to get you started.

Printing Using CSharp[^]

Printing in C#[^]

If those do not suit, there are plenty more on the internet.

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