C#圖片動畫效果(旋轉360度)異步

  private void Button1_Click(object sender, EventArgs e)
        {
         
            
            Graphics graphics = this.CreateGraphics();
            graphics.Clear(Color.White);

            //裝入圖片 資源

            //Bitmap image = new Bitmap(WindowsFormsApplication1.Properties.Resources.image_101);
            Bitmap image = new Bitmap(HZH_Controls.Properties.Resources.alarm);

            //獲取當前窗口的中心點

            Rectangle rect = new Rectangle(0, 0, this.ClientSize.Width, this.ClientSize.Height);
            PointF center = new PointF(rect.Width / 2, rect.Height / 2);

            float offsetX = 0;
            float offsetY = 0;
            offsetX = center.X - image.Width / 2;
            offsetY = center.Y - image.Height / 2;
            //構造圖片顯示區域:讓圖片的中心點與窗口的中心點一致
            RectangleF picRect = new RectangleF(offsetX, offsetY, image.Width, image.Height);
            PointF Pcenter = new PointF(picRect.X + picRect.Width / 2,
                picRect.Y + picRect.Height / 2);
            Color c = Color.FromArgb(200, 200, 200);


            //讓圖片繞中心旋轉一周
            for (int i = 360; i > 0; i -= 10)
            {
                // 繪圖平面以圖片的中心點旋轉
                graphics.TranslateTransform(Pcenter.X, Pcenter.Y);


                graphics.RotateTransform(i);
                //恢復繪圖平面在水平和垂直方向的平移
                graphics.TranslateTransform(-Pcenter.X, -Pcenter.Y);
                //繪制圖片並延時
                graphics.DrawImage(image, picRect);
                Thread.Sleep(100);
                graphics.Clear(c);

                //重置繪圖平面的所有變換
                graphics.ResetTransform();
            }
        }

 以上代碼是同步的，用戶體驗不好。

下面是經過改善的異步方法

  private void Button1_Click(object sender, EventArgs e)
        {
            Graphics graphics = this.CreateGraphics();
            graphics.Clear(Color.White);

            //裝入圖片 資源

            //Bitmap image = new Bitmap(WindowsFormsApplication1.Properties.Resources.image_101);
            Bitmap image = new Bitmap(HZH_Controls.Properties.Resources.alarm);

            //獲取當前窗口的中心點

            Rectangle rect = new Rectangle(0, 0, this.ClientSize.Width, this.ClientSize.Height);
            PointF center = new PointF(rect.Width / 2, rect.Height / 2);

            float offsetX = 0;
            float offsetY = 0;
            offsetX = center.X - image.Width / 2;
            offsetY = center.Y - image.Height / 2;
            //構造圖片顯示區域:讓圖片的中心點與窗口的中心點一致
            RectangleF picRect = new RectangleF(offsetX, offsetY, image.Width, image.Height);
            PointF Pcenter = new PointF(picRect.X + picRect.Width / 2,
                picRect.Y + picRect.Height / 2);

            Action<Graphics, PointF, Bitmap, RectangleF> action = test;//聲明委托
            action.BeginInvoke(graphics, Pcenter, image, picRect,null,null);//異步調用
        }
        static void test(Graphics graphics,PointF Pcenter,Bitmap image, RectangleF picRect) {
            //讓圖片繞中心旋轉一周
            Color c = Color.FromArgb(200, 200, 200);
            for (int i = 360; i > 0; i -= 10)
            {
                // 繪圖平面以圖片的中心點旋轉
                graphics.TranslateTransform(Pcenter.X, Pcenter.Y);


                graphics.RotateTransform(i);
                //恢復繪圖平面在水平和垂直方向的平移
                graphics.TranslateTransform(-Pcenter.X, -Pcenter.Y);
                //繪制圖片並延時
                graphics.DrawImage(image, picRect);
                Thread.Sleep(100);
                graphics.Clear(c);

                //重置繪圖平面的所有變換
                graphics.ResetTransform();
            }
        }