C#，如何手动设置光标位置

Question

我做了 "Get Coordinates" 部分，我需要做 "Set" 部分，我可以手动输入坐标，然后按 "Set" 按钮来制作 "Blue Cirlce"将与我在 textBox2 中输入的坐标一起出现在 pictureBox1 上。此代码为 "Get":

    int mouseX, mouseY;
    Pen bluePen = new Pen(Color.Blue, 1);
    private void pictureBox1_MouseClick(object sender, MouseEventArgs e)
    {
        textBox1.Text = "X = " + e.X + " ; Y = " + e.Y;
    }
    private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
    {
        mouseX = e.X;
        mouseY = e.Y;
        pictureBox1.Refresh();
    }
    private void pictureBox1_Paint(object sender, PaintEventArgs e)
    {
        Rectangle circle = new Rectangle(mouseX - 8, mouseY - 8, 16, 16);
        e.Graphics.DrawEllipse(bluePen, circle);
    }

Answer 1

如果我没理解错的话，您是想找到一种方法将您的输入解析为坐标。试试这个（您需要仔细验证输入字符串并处理将字符串转换为 int 时可能抛出的异常）。

private void btnSet_Click(object sender, EventArgs e)
{
    string input = tbInput.Text.Trim(); 
    string[] parts = input.Split(",".ToCharArray()); //assume your coordinates are commas-separated, like "80,100"
    if (parts.Length == 2)
    {
        mouseX = int.Parse(parts[0]);
        mouseY = int.Parse(parts[1]);
        pictureBox1.Refresh(); //Now force picturebox to repaint
    }
}

Answer 2

给'set'按钮添加按钮点击事件处理方法'ButtonSet_Click'。

    private void ButtonSet_Click(object sender, EventArgs e)
    {                    
        Point p = getXYfromTextBox();
        Rectangle circle = new Rectangle(p.X - 8, p.Y - 8, 16, 16);
        Graphics g = pictureBox1.CreateGraphics();
        g.DrawEllipse(redPen, circle);
    }

    //this method can be optimized
    private Point getXYfromTextBox()
    {
        string xy = textBox2.Text.Trim();
        string[] xys = xy.Split(';');
        mouseX = Convert.ToInt32(xys[0].Split('=')[1].Trim());
        mouseY = Convert.ToInt32(xys[1].Split('=')[1].Trim());
        Point p = new Point(mouseX, mouseY);
        return p;
    }

C#，如何手动设置光标位置

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