C#之PixturBox控件实现缩放和拖动图片

一、实现鼠标滚轮控制图片缩放；

1、设置PixtureBox属性：

　　Dock：none

　　SizeMode：StretchImage

2、添加事件：

pbxDrawing.MouseWheel += new MouseEventHandler(pbxDrawing_MouseWheel);

private void ScrewInfoForm_Shown(object sender, EventArgs e)
        {
            //加载装配图纸
            string drawingPath = Path.Combine(@"\192.168.2.136PCS", productCode + ".png");
            try
            {
                pbxDrawing.Load(drawingPath);
            }
            catch (Exception ex)
            {
                MessageBox.Show("加载装配图纸失败,详细:" + ex.Message, "测量", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
        }

 //实现滚轮缩放
        private void pbxDrawing_MouseWheel(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if (e.Delta < 0)
            {
                this.pbxDrawing.Width = this.pbxDrawing.Width * 9 / 10;
                this.pbxDrawing.Height = this.pbxDrawing.Height * 9 / 10;
            }
            else
            {
                this.pbxDrawing.Width = this.pbxDrawing.Width * 11 / 10;
                this.pbxDrawing.Height = this.pbxDrawing.Height * 11 / 10;
            }
        }

 //实现移动图片
        int xPos;
        int yPos;
        bool MoveFlag;
        private void pbxDrawing_MouseDown(object sender, MouseEventArgs e)
        {
            this.pbxDrawing.Focus();
            MoveFlag = true;//已经按下.
            xPos = e.X;//当前x坐标.
            yPos = e.Y;//当前y坐标.
        }

        //在picturebox的鼠标按下事件里.
        private void pbxDrawing_MouseUp(object sender, MouseEventArgs e)
        {
            MoveFlag = false;
        }

        //在picturebox鼠标移动
        private void pbxDrawing_MouseMove(object sender, MouseEventArgs e)
        {
            if (MoveFlag)
            {
                pbxDrawing.Left += Convert.ToInt16(e.X - xPos);//设置x坐标.
                pbxDrawing.Top += Convert.ToInt16(e.Y - yPos);//设置y坐标.
            }
        }