在WinForms C#中绘制实心圆

问题描述：

我有一个与连接交互的WinForms应用程序.如果连接正常，我想显示一个绿色的(一切都很好")实心圆，否则，我想要显示一个红色实心的圆.

I have a WinForms application that interacts with a connection. If the connection is fine I want to show a green ("everything is fine") filled circle, if not I want to show a red filled circle.

我在工具箱中没有找到任何圆形元素，因此我认为必须自己绘制.

I found no circle element in the toolbox so I think I have to draw it on my own.

我创建了一个名为 picBoxClientState 的图片框，并从此代码开始

I created a picture box called picBoxClientState and started with this code

public partial class FrmMain : Form
{
    public void CheckSignedInState()
    {
        // some other code

        DrawClientStateIcon(client.IsSignedIn);
    }

    private void DrawClientStateIcon(bool isSignedIn)
    {
        Point rectangleLocation = picBoxClientState.Location;
        Size rectangleSize = picBoxClientState.Size;
        Rectangle rectangle = new Rectangle(rectangleLocation, rectangleSize);

        Color iconColor = isSignedIn ? Color.Green : Color.Red;
        SolidBrush iconBrush = new SolidBrush(iconColor);

        Graphics graphics = picBoxClientState.CreateGraphics();
        graphics.FillEllipse(iconBrush, rectangle);
    }
}

每当我调用 CheckSignedInState()时，如何在此图片框上绘画?

How can I draw on this picturebox whenever I call CheckSignedInState() ?

也许有比绘制更好的方法了吗?(我不想切换两个图像，因为可能会绘制更多状态)

Maybe there is a better way instead of drawing? (I don't want to toggle two images because there might be more states to draw)

答

使用 Label 控件绘制椭圆的简单示例.
您可以使用具有 Paint事件的任何控件绘制形状.
它也可以是 Panel ， PictureBox ， Button ...

A simple example using a Label control to draw an ellipse.
You can use any control that has a Paint event to draw shapes.
It could also be a Panel, a PictureBox, a Button...

在类范围内声明的 bool 变量( clientIsSignedIn )用于跟踪当前状态，如您的 client.IsSignedIn 所报告的那样.>值.

A bool variable (clientIsSignedIn) declared at Class scope is used to keep track of the current status, as reported by your client.IsSignedIn value.

状态更改时，更新 clientIsSignedIn 和

When the status changes, update clientIsSignedIn and Invalidate() the Control that provides the visual aid.

bool clientIsSignedIn = false;

public void CheckSignedInState()
{
    // some other code
    clientIsSignedIn = client.IsSignedIn;
    lblVisualStatus.Invalidate();
}

private void lblVisualStatus_Paint(object sender, PaintEventArgs e)
{
    e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
    e.Graphics.FillEllipse((clientIsSignedIn) ? Brushes.Green : Brushes.Red, ((Control)sender).ClientRectangle);
}

在WinForms C#中绘制实心圆

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