C#Winforms Region.可见 [英] C# Winforms Region.IsVisible

问题描述

我想检测在我自定义创建的区域上的鼠标单击.

I want to detect mouse click on my custom created region.

1)我用矩形尝试了这段代码，并且可以用，但是用字符串却没有用

1) I ve tried this code with rectangle and it worked, but with string it doesnt

 GraphicsPath gp = new GraphicsPath();
    Region reg = new Region();
        private void Form1_Load(object sender, EventArgs e)
    {

        gp.AddString("TEXT", new FontFamily("Arial"),0, 20.0f, new Point(300, 10), StringFormat.GenericDefault);
        gp.Widen(Pens.AliceBlue);
        reg = new Region(gp);
    }

这是第2部分

  private void panel1_MouseDown(object sender, MouseEventArgs e)
    {
        if (reg.IsVisible(e.Location))
        {
            MessageBox.Show("aaaa");
        }
    }

它不显示消息框. :)

It doesnt show the message box. :)

这是我的绘画事件，查看我的字符串在哪里

EDIT :here is my Paint event to see where my string is

 private void panel1_Paint(object sender, PaintEventArgs e)
    {


        e.Graphics.DrawString("TEXT", new Font("Arial", 20), Brushes.Yellow, 300,100 );
    }

推荐答案

最基本的错误是错字:一次在y = 10上绘画，另一次在y = 100上绘画.

The most basic error is a typo: One time you draw at y = 10, the other time at y = 100.

但是还有另一个根本不那么明显的问题:

But there is another issue which is not so obvious at all:

添加

e.Graphics.FillPath(Brushes.Firebrick, gp);

到Paint事件，您会看到它:字体大小完全不同.

to the Paint event and you'll see it: The fonts have quite a different size.

这是因为在将文本添加到GraphicsPath时，它使用的缩放比例(称为'emSize')与使用'Point'Graphics.DrawString缩放比例不同. >.

That is because when adding text to a GraphicsPath it is using a different scale (called 'emSize') than Graphics.DrawString does, which uses 'Point'.

要进行调整，您可以使用以下方法:

To adapt you can use this:

float fontsize = 20.0f;
using (Graphics g = panel1.CreateGraphics()) fontsize *= g.DpiY / 72f;

现在，您可以使用正确的坐标来最好地构建GraphicsPath.

Now you can build the GraphicsPath, best with the correct coordinates..:

gp.AddString("TEXT", new FontFamily("Arial"), 0, fontsize, 
             new Point(300, 100), StringFormat.GenericDefault);

这篇关于C#Winforms Region.可见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！