C#控件picturebox实现图像拖拽和缩放_c#在picturebox控件上绘制矩形框,鼠标点击可拖拽,伸缩资源-CSDN下载

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C#控件控件picturebox实现图像拖拽和缩放实现图像拖拽和缩放

本文实例为大家分享了C# picturebox实现图像拖拽和缩放的具体代码，供大家参考，具体内容如下

1.核心步骤：核心步骤：

①新建Point类型全局变量mouseDownPoint，记录拖拽过程中鼠标位置；

②MouseDown事件记录Cursor位置；

③MouseMove事件计算移动矢量，并更新pictureBox1.Location。

代码：

private void pictureBox1_MouseDown(object sender, MouseEventArgs e)

{

if (e.Button == MouseButtons.Left)

{

mouseDownPoint.X = Cursor.Position.X; //记录鼠标左键按下时位置

mouseDownPoint.Y = Cursor.Position.Y;

isMove = true;

pictureBox1.Focus(); //鼠标滚轮事件(缩放时)需要picturebox有焦点

}

}

private void pictureBox1_MouseUp(object sender, MouseEventArgs e)

{

if (e.Button == MouseButtons.Left)

{

isMove = false;

}

}

private void pictureBox1_MouseMove(object sender, MouseEventArgs e)

{

pictureBox1.Focus(); //鼠标在picturebox上时才有焦点，此时可以缩放

if (isMove)

{

int x, y; //新的pictureBox1.Location(x,y)

int moveX, moveY; //X方向，Y方向移动大小。

moveX = Cursor.Position.X - mouseDownPoint.X;

moveY = Cursor.Position.Y - mouseDownPoint.Y;

x = pictureBox1.Location.X + moveX;

y = pictureBox1.Location.Y + moveY;

pictureBox1.Location = new Point(x, y);

mouseDownPoint.X = Cursor.Position.X;

mouseDownPoint.Y = Cursor.Position.Y;

}

}

private void panel2_MouseDown(object sender, MouseEventArgs e)

{

if (e.Button == MouseButtons.Left)

{

mouseDownPoint.X = Cursor.Position.X; //记录鼠标左键按下时位置

mouseDownPoint.Y = Cursor.Position.Y;

isMove = true;

}

}

private void panel2_MouseUp(object sender, MouseEventArgs e)

{

if (e.Button == MouseButtons.Left)

{

isMove = false;

}

}

private void panel2_MouseMove(object sender, MouseEventArgs e)

{

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