private void btnDrawPic_Click(object sender, EventArgs e)
{
//绘画图形初始化
Image<Bgr, byte> img = new Image<Bgr, byte>(200, 200, new Bgr(255, 255, 255));//创建一张白色的200*200的图片
Rectangle rect = new Rectangle(new Point(80, 80), new Size(40, 40));//创建一个矩形,左上角为(80,80),大小为40*40;
CircleF circlef = new CircleF(new PointF(100, 100), 40);//创建中心(100,100)半径40的圆形
string str = "I love You";//创建字符串
Point str_location = new Point(0, 40);
//创建多边形
Random r = new Random();
Point[] pt = new Point[3];
Point[] pt1 = new Point[3];
Point[] pt2 = new Point[3];
for (int i = 0; i < 3; i++)
{
pt[i] = new Point(