C＃，如何手动设置光标位置

Question

我做了“获取坐标”部分，我需要做“设置”部分，在这里我可以手动输入坐标，然后按“设置”按钮使“蓝色Cirlce”与我输入的坐标一起出现。 pictureBox1 textBox2 。 此代码为“获取”：

    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

将按钮单击事件处理方法“ ButtonSet_Click”添加到“设置”按钮。

    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;
    }

Answer 2

如果我理解正确，那么您正在尝试寻找一种将输入解析为坐标的方法。 尝试此操作（您需要仔细验证输入字符串并处理将字符串强制转换为int时引发的潜在异常）。

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
    }
}