OpenCV绘制ROI区域(五)
鼠标绘制矩形
using OpenCvSharp;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace _01_绘制矩形
{
internal class Program
{
//宏 常量
public static string WINDOW_NAME = "程序窗口";
//Scalar.All(0) 矩阵 像素点 多个通道 Scalar.All(0)设置每个通道都为空
public static Mat scrImage = new Mat(600, 800, MatType.CV_8UC3,Scalar.All(0));
public static Rect g_rectange;//矩形类
public static bool g_bDrawingBox=false;//是否开始绘制
public static Random g_rng = new Random();//随机颜色
static void Main(string[] args)
{
//1.准备参数
g_rectange = new Rect(-1,-1,0,0);
Mat tempImage = new Mat();
//2.设置鼠标操作的事件
Cv2.NamedWindow(WINDOW_NAME);
//委托
MouseCallback GetRBMouseCallback = new MouseCallback(on_MonuseHandle);
//绑定事件
Cv2.SetMouseCallback(WINDOW_NAME, GetRBMouseCallback);
//3.监听
while (true)
{
scrImage.CopyTo(tempImage);// 拷贝原图到临时变量
if (g_bDrawingBox)
{
DrawRectangle(ref tempImage, g_rectange);
}
Cv2.ImShow(WINDOW_NAME, tempImage);
if (Cv2.WaitKey(10)==27)//按下了ESC 程序推出
{
break;
}
}
}
//委托类型的事件处理函数
//参数1:事件对象 里面包含当前事件的一系列参数 如:鼠标按下的位置 移动的位置 事件的类型 .......
// x ,y 鼠标的 坐标
public static void on_MonuseHandle(MouseEventTypes @event,int x,int y,MouseEventFlags flages,IntPtr userdate)
{
//鼠标移动
//MouseEventTypes 委托类型
//MouseEventTypes.MouseMove 移动
//MouseEventTypes.LButtonDown 鼠标左键按下
//MouseEventTypes.LButtonUp 鼠标左键抬起
if (@event== MouseEventTypes.MouseMove)
{
if (g_bDrawingBox)//判断鼠标是否按下 鼠标按下才能开始绘制
{
// 把鼠标的坐标记录到 Rect 变量中
g_rectange.Width= x - g_rectange.X;
g_rectange.Height = y - g_rectange.Y;
}
}
//鼠标左键按下
if (@event == MouseEventTypes.LButtonDown)
{
g_bDrawingBox=true;
g_rectange=new Rect(x,y,0,0);//记录起始点
}
//鼠标左键抬起
if (@event == MouseEventTypes.LButtonUp)
{
g_bDrawingBox=false;
//对宽高小于0的处理
if (g_rectange.Width<0)
{
g_rectange.X += g_rectange.Width;
g_rectange.Width*=-1;
}
if (g_rectange.Height < 0)
{
g_rectange.Y += g_rectange.Height;
g_rectange.Height *= -1;
}
//绘制图形
DrawRectangle(ref scrImage, g_rectange);
}
}
public static void DrawRectangle(ref Mat img,Rect box)
{
if ((box.BottomRight.X > box.TopLeft.X) && (box.BottomRight.Y > box.TopLeft.Y))
{
Cv2.Rectangle(img, box.TopLeft, box.BottomRight, new Scalar(g_rng.Next(255), g_rng.Next(255), g_rng.Next(255)), 2);//随机颜色
}
}
}
}
脚本绘制
using OpenCvSharp;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace _02_脚本绘制
{
internal class Program
{
public static string WINDOW_NAME1 = "【绘制图1】";// 为窗口标题定义的宏
public static string WINDOW_NAME2 = "【绘制图2】";// 为窗口标题定义的宏
public static int WINDOW_WIDTH = 600; // 定义窗口大小的宏
static void Main(string[] args)
{
// 创建空白的Mat图像
Mat atomImage = new Mat(WINDOW_WIDTH, WINDOW_WIDTH, MatType.CV_8UC3);
Mat rookImage = new Mat(WINDOW_WIDTH, WINDOW_WIDTH, MatType.CV_8UC3);
// --------------<1>绘制化学中的原子示例图--------------
// 先绘制出椭圆
DrawEllipse(atomImage, 90);
DrawEllipse(atomImage, 0);
DrawEllipse(atomImage, 45);
DrawEllipse(atomImage, -45);
// 再绘制圆心
DrawFilledCircle(atomImage, new Point(WINDOW_WIDTH / 2, WINDOW_WIDTH / 2));
// --------------<2>绘制组合图--------------
//先绘制出椭圆
DrawPolygon(rookImage);
// 绘制矩形
Cv2.Rectangle(rookImage,
new Point(0, 7 * WINDOW_WIDTH / 8),
new Point(WINDOW_WIDTH, WINDOW_WIDTH),
new Scalar(0, 255, 255), -1, LineTypes.Link8);
// 绘制一些线段
DrawLine(rookImage, new Point(0, 15 * WINDOW_WIDTH / 16), new Point(WINDOW_WIDTH, 15 * WINDOW_WIDTH / 16));
DrawLine(rookImage, new Point(WINDOW_WIDTH / 4, 7 * WINDOW_WIDTH / 8), new Point(WINDOW_WIDTH / 4, WINDOW_WIDTH));
DrawLine(rookImage, new Point(WINDOW_WIDTH / 2, 7 * WINDOW_WIDTH / 8), new Point(WINDOW_WIDTH / 2, WINDOW_WIDTH));
DrawLine(rookImage, new Point(3 * WINDOW_WIDTH / 4, 7 * WINDOW_WIDTH / 8), new Point(3 * WINDOW_WIDTH / 4, WINDOW_WIDTH));
// 显示绘制出的图像
Cv2.ImShow(WINDOW_NAME1, atomImage);
Cv2.MoveWindow(WINDOW_NAME1, 0, 200);
Cv2.ImShow(WINDOW_NAME2, rookImage);
Cv2.MoveWindow(WINDOW_NAME2, WINDOW_WIDTH, 200);
Cv2.WaitKey(0);
}
// 自定义的绘制函数，实现了绘制不同角度、相同尺寸的椭圆
public static void DrawEllipse(Mat img, double angle)
{
Cv2.Ellipse(img,
new Point(WINDOW_WIDTH / 2, WINDOW_WIDTH / 2),
new Size(WINDOW_WIDTH / 4, WINDOW_WIDTH / 16),
angle, 0, 360, new Scalar(255, 129, 0), 2, LineTypes.Link8);
}
// 自定义的绘制函数，实现了实心圆的绘制
public static void DrawFilledCircle(Mat img, Point center)
{
Cv2.Circle(img, center.X, center.Y, WINDOW_WIDTH / 32, new Scalar(0, 0, 255), -1, LineTypes.Link8);
}
// 自定义的绘制函数，实现了凹多边形的绘制
public static void DrawPolygon(Mat img)
{
//创建一些点
List<List<Point>> pts = new List<List<Point>>()
{
new List<Point>
{
new Point(WINDOW_WIDTH / 4, 7 * WINDOW_WIDTH / 8),
new Point(3 * WINDOW_WIDTH / 4, 7 * WINDOW_WIDTH / 8),
new Point(3 * WINDOW_WIDTH / 4, 13 * WINDOW_WIDTH / 16),
new Point(11 * WINDOW_WIDTH / 16, 13 * WINDOW_WIDTH / 16),
new Point(19 * WINDOW_WIDTH / 32, 3 * WINDOW_WIDTH / 8),
new Point(3 * WINDOW_WIDTH / 4, 3 * WINDOW_WIDTH / 8),
new Point(3 * WINDOW_WIDTH / 4, WINDOW_WIDTH / 8),
new Point(26 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 8),
new Point(26 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 4),
new Point(22 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 4),
new Point(22 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 8),
new Point(18 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 8),
new Point(18 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 4),
new Point(14 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 4),
new Point(14 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 8),
new Point(WINDOW_WIDTH / 4, WINDOW_WIDTH / 8),
new Point(WINDOW_WIDTH / 4, 3 * WINDOW_WIDTH / 8),
new Point(13 * WINDOW_WIDTH / 32, 3 * WINDOW_WIDTH / 8),
new Point(5 * WINDOW_WIDTH / 16, 13 * WINDOW_WIDTH / 16),
new Point(WINDOW_WIDTH / 4, 13 * WINDOW_WIDTH / 16)
}
};
// 绘制多边形填充
Cv2.FillPoly(img, pts, new Scalar(255, 255, 255), LineTypes.Link8);
}
// 自定义的绘制函数，实现了线的绘制
public static void DrawLine(Mat img, Point start, Point end)
{
Cv2.Line(img, start.X, start.Y, end.X, end.Y, new Scalar(0, 0, 0), 2, LineTypes.Link8);
}
}
}
原文地址：https://blog.csdn.net/weixin_45788237/article/details/142381286
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