图形功能问题 [英] Graphics functionality question

问题描述

我如何进行这项工作.我有两种方法，

How do I make this work. I have two methods,

public void Calculate(Graphics g)
 {
 ---code---
 }   

private void btnPrint_Click(object sender, EventArgs e)
 {
  ---code---
  Calculate(Graphics g);
 }   

我想在btnPrint_Click方法中调用Calculate方法，但无法执行.感谢您的帮助.

I want to call the Calculate method inside the btnPrint_Click method but I cannot do it. Any help is appreciated.

推荐答案

简单.如果您想多想一点，便会轻松找到解决方案.

Easy. You would easily find a solution if you thought just a bit more.

public partial class FormMain {
    
    void Print() {
        using (PrintDocument pd = new PrintDocument()) {
                if (PrinterSettings != null) 
                    PrintDialog.PrinterSettings = PrinterSettings;
                pd.PrintPage += (sender, eventArgs) => { this.Calculate(eventArgs.Graphics); };
                DialogResult result = PrintDialog.ShowDialog();
                if (result != DialogResult.OK) return;
                PrinterSettings = PrintDialog.PrinterSettings;
                PrintDialog.Document = pd;
                pd.PrinterSettings = PrinterSettings;
                // could be a lot more, like taking into account page setup, using page setup dialog...
                pd.Print();
            } //using (pd.Dispose is automatically called in this point)
    } //Print

    PrintDialog PrintDialog = new PrintDialog();
    PrinterSettings PrinterSettings;

    //...

} //class FormMain

您的Calculate(Graphics g)实际上是一个好主意，但您可能低估了它.您从System.Drawing.Graphics的具体实例中提取了一些渲染.这样，您只有一种图形渲染方法，可以从某些控件OnPaint中调用它，还可以将其用于其他渲染目标:打印"，打印到..."，导出到位图"，导出到...". (某些矢量图形)之类的东西-相当普遍.你有主意吗?

—SA

Your Calculate(Graphics g) is actually a good idea, but you probably underestimate it. You abstract some rendering from concrete instance of System.Drawing.Graphics. This way, you can have only one graphics rendering method and call it from some controls OnPaint but also use it for other targets of rendering: "Print", "Print to…", "Export to bitmap", "Export to…" (some vector graphics) and the like — quite universal. Are you getting the idea?

—SA

完全破获，但我认为TRK3是正确的:

Totally rip off but I think TRK3 is right:

报价:

您是什么意思我不能做到"?您是说编译器抱怨是因为您应该调用:Calculate(g)而不是Calculate(Graphics g)吗?还是说您在调用异常时收到异常?还是?

What do you mean "I cannot do it"? Do you mean the compiler complains because you should be calling: Calculate(g) instead of Calculate(Graphics g) ? Or do you mean you get an exception when you call it? Or ?

这篇关于图形功能问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！