C#制作图像旋转的程序范例

private void RotateTransform_Click(object sender, System.EventArgs e)

        {

            Graphics graphics=this.CreateGraphics();

            graphics.Clear(Color.White);

            //装入图片

            Bitmap image=new Bitmap("nemo.bmp");

            //获取当前窗口的中心点

            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;

            //构造图片显示区域:让图片的中心点与窗口的中心点一致

            RectangleF picRect=new RectangleF(offsetX,offsetY,image.Width,image.Height);

            PointF Pcenter=new PointF(picRect.X+picRect.Width/2,

                picRect.Y+picRect.Height/2);

    

            //让图片绕中心旋转一周

            for(int i=0;i<361;i+=10)

            {

                // 绘图平面以图片的中心点旋转

                graphics.TranslateTransform(Pcenter.X, Pcenter.Y);

                graphics.RotateTransform(i);

                //恢复绘图平面在水平和垂直方向的平移

                graphics.TranslateTransform(-Pcenter.X, -Pcenter.Y);

                //绘制图片并延时

                graphics.DrawImage(image,picRect);    

                Thread.Sleep(100);

                //重置绘图平面的所有变换

                graphics.ResetTransform();

            }

        }