C#-使用多个图片框处理鼠标位置

我以窗口形式创建了4个PictureBox（pictureBox1、pictureBox2、pictureBox3和pictureBox4）。我还创建了一个函数，可以在pictureBox上绘制一个矩形，如下所示：

要创建矩形，请执行以下操作：

private void PictureBox_MouseMove(object sender, MouseEventArgs e)
{
    var x = e.X;
    var y = e.Y;

    var width = 10;
    var height = 10;

    FwRect = new[]
    {
        new PointF(x, y), new PointF(x, y + height), new PointF(x + width, y + height),
                new PointF(x + width, y)
    };
    FwRectan = new Rectangle((int)x, (int)y, (int)width, (int)height);
    Refresh();
}

private void PictureBox_Paint(object sender, PaintEventArgs e)
{
    using (var pen = new Pen(Color.Black, 2))
    {
        //Draw the rectangle on our form with the pen
        e.Graphics.DrawRectangle(pen, FwRectan);
    }
}

然后，我为每个pictureBox添加了此事件：

this.pictureBox1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.PictureBox_MouseMove);
this.pictureBox2.MouseMove += new System.Windows.Forms.MouseEventHandler(this.PictureBox_MouseMove);
this.pictureBox3.MouseMove += new System.Windows.Forms.MouseEventHandler(this.PictureBox_MouseMove);
this.pictureBox4.MouseMove += new System.Windows.Forms.MouseEventHandler(this.PictureBox_MouseMove);

public partial class Form1 : Form
{

    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        this.pictureBox1.MouseMove += this.PictureBox_MouseMove;
        this.pictureBox2.MouseMove += this.PictureBox_MouseMove;
        this.pictureBox3.MouseMove += this.PictureBox_MouseMove;
        this.pictureBox4.MouseMove += this.PictureBox_MouseMove;

        this.pictureBox1.MouseLeave += this.pictureBox_MouseLeave;
        this.pictureBox2.MouseLeave += this.pictureBox_MouseLeave;
        this.pictureBox3.MouseLeave += this.pictureBox_MouseLeave;
        this.pictureBox4.MouseLeave += this.pictureBox_MouseLeave;

        this.pictureBox1.Paint += this.PictureBox_Paint;
        this.pictureBox2.Paint += this.PictureBox_Paint;
        this.pictureBox3.Paint += this.PictureBox_Paint;
        this.pictureBox4.Paint += this.PictureBox_Paint;
    }

    private int bxWidth = 10;
    private int bxHeight = 10;
    private void PictureBox_MouseMove(object sender, MouseEventArgs e)
    {
        PictureBox pb = (PictureBox)sender;
        pb.Tag = new Rectangle(e.X, e.Y, bxWidth, bxHeight);
        pb.Invalidate();
    }

    private void PictureBox_Paint(object sender, PaintEventArgs e)
    {
        PictureBox pb = (PictureBox)sender;
        if (pb.Tag != null && pb.Tag is Rectangle)
        {
            Rectangle rc = (Rectangle)pb.Tag;
            using (var pen = new Pen(Color.Black, 2))
            {
                //Draw the rectangle on our form with the pen
                e.Graphics.DrawRectangle(pen, rc);
            }
        }            
    }

    private void pictureBox_MouseLeave(object sender, EventArgs e)
    {
        PictureBox pb = (PictureBox)sender;
        pb.Tag = null; // if you want the box to disappear when the mouse leaves?
        pb.Invalidate();
    }

}

要绘制矩形，请执行以下操作：

private void PictureBox_MouseMove(object sender, MouseEventArgs e)
{
    var x = e.X;
    var y = e.Y;

    var width = 10;
    var height = 10;

    FwRect = new[]
    {
        new PointF(x, y), new PointF(x, y + height), new PointF(x + width, y + height),
                new PointF(x + width, y)
    };
    FwRectan = new Rectangle((int)x, (int)y, (int)width, (int)height);
    Refresh();
}

private void PictureBox_Paint(object sender, PaintEventArgs e)
{
    using (var pen = new Pen(Color.Black, 2))
    {
        //Draw the rectangle on our form with the pen
        e.Graphics.DrawRectangle(pen, FwRectan);
    }
}

最后，如果我在pictureBox1中移动鼠标并绘制一个矩形，它也会为每个pictureBox绘制一个矩形。如何仅在鼠标所在的pictureBox上绘制矩形

---

多谢各位

您有4个

图片框

，因此您需要4个

矩形

来绘制当前鼠标移动：

Rectangle[] _rectangle = new Rectangle[4];

然后在常见的

PictureBox\u MouseMove

和

PictureBox\u Paint

事件中，您需要确定要使用哪个值，即PictureBox的索引。可以通过使用

标记

属性或将所有PictureBox放入数组以使其索引匹配来完成：

PictureBox _control = new PictureBox[] { pictureBox1, pictureBox2, pictureBox3, pictureBox4 };

事件句柄将如下所示

void PictureBox_MouseMove(object sender, MouseEventArgs e)
{
    var x = e.X;
    var y = e.Y;

    var width = 10;
    var height = 10;

    FwRect = new[]
    {
        new PointF(x, y), new PointF(x, y + height), new PointF(x + width, y + height),
                new PointF(x + width, y)
    };

    var index = _control.IndexOf(sender);
    _rectangle[index] = new Rectangle((int)x, (int)y, (int)width, (int)height);
    _rectangle[index].Invalidate();
}

void PictureBox_Paint(object sender, PaintEventArgs e)
{
    var index = _control.IndexOf(sender);
    using (var pen = new Pen(Color.Black, 2))
    {
        //Draw the rectangle on our form with the pen
        e.Graphics.DrawRectangle(pen, _rectangle[index]);
    }
}

---

编辑：

---

实际上，上述解决方案将记住每个picturebox的矩形。可能不是你想要的。简单的解决方法是清除mousemove中的其他矩形。虽然更合适的解决方案是从mousemove中记住

sender

，并且只在paint中绘制匹配的

sender

。

您有4个

PictureBox

，因此您需要4个

矩形来绘制当前鼠标移动：

Rectangle[] _rectangle = new Rectangle[4];

然后在常见的
PictureBox\u MouseMove
和
PictureBox\u Paint
事件中，您需要确定要使用哪个值，即PictureBox的索引。可以通过使用
标记
属性或将所有PictureBox放入数组以使其索引匹配来完成：

PictureBox _control = new PictureBox[] { pictureBox1, pictureBox2, pictureBox3, pictureBox4 };

事件句柄将如下所示

void PictureBox_MouseMove(object sender, MouseEventArgs e)
{
    var x = e.X;
    var y = e.Y;

    var width = 10;
    var height = 10;

    FwRect = new[]
    {
        new PointF(x, y), new PointF(x, y + height), new PointF(x + width, y + height),
                new PointF(x + width, y)
    };

    var index = _control.IndexOf(sender);
    _rectangle[index] = new Rectangle((int)x, (int)y, (int)width, (int)height);
    _rectangle[index].Invalidate();
}

void PictureBox_Paint(object sender, PaintEventArgs e)
{
    var index = _control.IndexOf(sender);
    using (var pen = new Pen(Color.Black, 2))
    {
        //Draw the rectangle on our form with the pen
        e.Graphics.DrawRectangle(pen, _rectangle[index]);
    }
}


编辑：

实际上，上述解决方案将记住每个picturebox的矩形。可能不是你想要的。简单的解决方法是清除mousemove中的其他矩形。虽然更合适的解决方案是从mousemove中记住
发送者
，并且只在paint中绘制匹配的
发送者
。
下面是一个示例，展示了如何将矩形存储在Sinatr在文章中提到的
.Tag
属性中。此示例还将在鼠标离开时清除矩形，以便在当前PictureBox中仅绘制一个矩形：

this.pictureBox1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.PictureBox_MouseMove);
this.pictureBox2.MouseMove += new System.Windows.Forms.MouseEventHandler(this.PictureBox_MouseMove);
this.pictureBox3.MouseMove += new System.Windows.Forms.MouseEventHandler(this.PictureBox_MouseMove);
this.pictureBox4.MouseMove += new System.Windows.Forms.MouseEventHandler(this.PictureBox_MouseMove);

public partial class Form1 : Form
{

    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        this.pictureBox1.MouseMove += this.PictureBox_MouseMove;
        this.pictureBox2.MouseMove += this.PictureBox_MouseMove;
        this.pictureBox3.MouseMove += this.PictureBox_MouseMove;
        this.pictureBox4.MouseMove += this.PictureBox_MouseMove;

        this.pictureBox1.MouseLeave += this.pictureBox_MouseLeave;
        this.pictureBox2.MouseLeave += this.pictureBox_MouseLeave;
        this.pictureBox3.MouseLeave += this.pictureBox_MouseLeave;
        this.pictureBox4.MouseLeave += this.pictureBox_MouseLeave;

        this.pictureBox1.Paint += this.PictureBox_Paint;
        this.pictureBox2.Paint += this.PictureBox_Paint;
        this.pictureBox3.Paint += this.PictureBox_Paint;
        this.pictureBox4.Paint += this.PictureBox_Paint;
    }

    private int bxWidth = 10;
    private int bxHeight = 10;
    private void PictureBox_MouseMove(object sender, MouseEventArgs e)
    {
        PictureBox pb = (PictureBox)sender;
        pb.Tag = new Rectangle(e.X, e.Y, bxWidth, bxHeight);
        pb.Invalidate();
    }

    private void PictureBox_Paint(object sender, PaintEventArgs e)
    {
        PictureBox pb = (PictureBox)sender;
        if (pb.Tag != null && pb.Tag is Rectangle)
        {
            Rectangle rc = (Rectangle)pb.Tag;
            using (var pen = new Pen(Color.Black, 2))
            {
                //Draw the rectangle on our form with the pen
                e.Graphics.DrawRectangle(pen, rc);
            }
        }            
    }

    private void pictureBox_MouseLeave(object sender, EventArgs e)
    {
        PictureBox pb = (PictureBox)sender;
        pb.Tag = null; // if you want the box to disappear when the mouse leaves?
        pb.Invalidate();
    }

}

以下是跑步的感觉：

下面是一个示例，展示了如何在Sinatr在其文章中提到的
.Tag
属性中存储矩形。此示例还将在鼠标离开时清除矩形，以便在当前PictureBox中仅绘制一个矩形：

this.pictureBox1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.PictureBox_MouseMove);
this.pictureBox2.MouseMove += new System.Windows.Forms.MouseEventHandler(this.PictureBox_MouseMove);
this.pictureBox3.MouseMove += new System.Windows.Forms.MouseEventHandler(this.PictureBox_MouseMove);
this.pictureBox4.MouseMove += new System.Windows.Forms.MouseEventHandler(this.PictureBox_MouseMove);

public partial class Form1 : Form
{

    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        this.pictureBox1.MouseMove += this.PictureBox_MouseMove;
        this.pictureBox2.MouseMove += this.PictureBox_MouseMove;
        this.pictureBox3.MouseMove += this.PictureBox_MouseMove;
        this.pictureBox4.MouseMove += this.PictureBox_MouseMove;

        this.pictureBox1.MouseLeave += this.pictureBox_MouseLeave;
        this.pictureBox2.MouseLeave += this.pictureBox_MouseLeave;
        this.pictureBox3.MouseLeave += this.pictureBox_MouseLeave;
        this.pictureBox4.MouseLeave += this.pictureBox_MouseLeave;

        this.pictureBox1.Paint += this.PictureBox_Paint;
        this.pictureBox2.Paint += this.PictureBox_Paint;
        this.pictureBox3.Paint += this.PictureBox_Paint;
        this.pictureBox4.Paint += this.PictureBox_Paint;
    }

    private int bxWidth = 10;
    private int bxHeight = 10;
    private void PictureBox_MouseMove(object sender, MouseEventArgs e)
    {
        PictureBox pb = (PictureBox)sender;
        pb.Tag = new Rectangle(e.X, e.Y, bxWidth, bxHeight);
        pb.Invalidate();
    }

    private void PictureBox_Paint(object sender, PaintEventArgs e)
    {
        PictureBox pb = (PictureBox)sender;
        if (pb.Tag != null && pb.Tag is Rectangle)
        {
            Rectangle rc = (Rectangle)pb.Tag;
            using (var pen = new Pen(Color.Black, 2))
            {
                //Draw the rectangle on our form with the pen
                e.Graphics.DrawRectangle(pen, rc);
            }
        }            
    }

    private void pictureBox_MouseLeave(object sender, EventArgs e)
    {
        PictureBox pb = (PictureBox)sender;
        pb.Tag = null; // if you want the box to disappear when the mouse leaves?
        pb.Invalidate();
    }

}

以下是跑步的感觉：

什么是FwIsDown、FwDisable和FwStartPointX？“它还为每个pictureBox绘制一个矩形”-为什么？我看不到您显示的代码中的答案，请显示更多信息，请参阅。将发件人置于图片框中，然后您可以读取框中的文本：PictureBox box=发件人为PictureBox；创建一个自定义的
PictureBox
，以避免出现这种情况。重写
OnPaint
方法以绘制橡皮筋+常用例程。这种方式将帮助您在实现中集中精力解决您试图解决的主要问题。我只需测试鼠标是否在发送者边界内：
if（（发送者作为PictureBox.bounds.Contains（（发送者作为PictureBox.Parent.PointToClient（Control.MousePosition））
什么是FwIsDown、FwDisable和FwStartPointX？它还为每个pictureBox绘制一个矩形“-为什么？我看不到您显示的代码中的答案，请显示更多信息，请参阅。将发件人置于图片框中，然后您可以读取框中的文本：PictureBox box=发件人为PictureBox；创建一个自定义的
PictureBox
，以避免出现这种情况。重写
OnPaint
方法以绘制橡皮筋+常用例程。这种方式将帮助您在实现中集中精力解决您试图解决的主要问题。我只需测试鼠标是否在发件人的边界内：
if（（发件人作为PictureBox.bounds.Contains（（发件人作为PictureBox.Parent.PointToClient（Control.MousePosition）））
Use
如果（pb.Tag是矩形rc）{…}
，则使用
如果（pb.Tag是矩形rc）{…}
。