c# - 如何在图像框上添加标记？

Question

public Form1()
{
    InitializeComponent();
    this.imgRoom.Click += new EventHandler(this.pictureBox1_Click);
}

private void pictureBox1_Click(object sender, EventArgs e)
{
    var label1 = new LabelControl();
    label1.Location = MousePosition;
    label1.BackColor = Color.Red;
    label1.Parent = imgRoom;
    label1.Text = "Point";
    imgRoom.Controls.Add(label1);
}

当我在所附屏幕上看到的地方单击时，点出现在另一个地方。如何解决这个问题呢？

Answer 1

MousePosition 在屏幕坐标中。您需要将其转换为客户端坐标。

private void pictureBox1_Click(object sender, EventArgs e)
    {
        var label1 = new LabelControl();
        label1.Location = imgRoom.PointToClient(MousePosition);  // changed here.
        label1.BackColor = Color.Red;
        label1.Parent = imgRoom;
        label1.Text = "Point";
        imgRoom.Controls.Add(label1);
    }