「深度学习福利」大神带你进阶工程师，立即查看>>> #include <iostream> #include <opencv2/opencv.hpp> using namespace std; using namespace cv; Rect box; bool drawing_box = false; Rect Eraser; bool drawing_eraser = false; int Eraser_Size = 5; /* * opencv实现橡皮擦功能总结：在鼠标事件中用背景色覆盖矩形的颜色 * 参考：//https://blog.csdn.net/zhoufan900428/article/details/45890053 */ void mouse_paint_callback(int event, int x, int y, int flags, void* param); void draw_box( Mat img, CvRect box) { rectangle(img, Point(box.x,box.y), Point(box.x+box.width,box.y+box.height), Scalar(0x00,0xff,0x00) //绿色 ); } void draw_Eraser( Mat img, CvRect Eraser) { rectangle(img, Point(Eraser.x - Eraser_Size,Eraser.y - Eraser_Size), Point(Eraser.x + Eraser_Size,Eraser.y + Eraser_Size), Scalar(0xff,0xff,0xff), //黑色 CV_FILLED //用黑色填充矩形表示橡皮擦 ); } void show_Eraser( Mat img, CvRect Eraser) { rectangle(img, Point(Eraser.x - Eraser_Size,Eraser.y - Eraser_Size), Point(Eraser.x + Eraser_Size,Eraser.y + Eraser_Size), Scalar(0x00,0x00,0x00), //用背景色白色填充 CV_FILLED ); } int main() { box = Rect(-1, -1, 0, 0); Eraser = Rect(-1, -1, 0, 0); Mat srcImage(600, 800, CV_8UC3); srcImage.setTo(Scalar(255, 255, 255)); //设置背景色颜色为白色 Mat tempImage; srcImage.copyTo(tempImage); namedWindow("Paint"); setMouseCallback("Paint", mouse_paint_callback, (void*)&srcImage); while(1){ srcImage.copyTo(tempImage); if(drawing_box) draw_box(tempImage,box); if(drawing_eraser) show_Eraser(tempImage,Eraser); imshow("Paint",tempImage); if(cvWaitKey(15) == 27) break; //wait ESC key } return 0; } void mouse_paint_callback(int event, int x, int y, int flags, void* param) { Mat& image = *(cv::Mat*)param; switch(event) { case CV_EVENT_MOUSEMOVE: //鼠标移动 { if(drawing_box) { cout<< (flags & CV_EVENT_FLAG_SHIFTKEY) << ends << CV_EVENT_FLAG_SHIFTKEY << "\n"; if((flags & CV_EVENT_FLAG_SHIFTKEY) == CV_EVENT_FLAG_SHIFTKEY) { //SHIFT键被压下 if (box.x>box.y) { box.width = x - box.x; box.height= (y - box.y > 0)?abs(x - box.x):-abs(x - box.x); } else { box.width = (x - box.x > 0)?abs(y - box.y):-abs(y - box.y); box.height= y - box.y; } } else { box.width = x - box.x; box.height= y - box.y; } } if(drawing_eraser) { Eraser = cvRect(x,y,0,0); draw_Eraser(image,Eraser); //用黑色方块表示一个橡皮擦 } } break; case CV_EVENT_LBUTTONDOWN: //左键压下 { drawing_box = true; box = Rect(x,y,0,0); } break; case CV_EVENT_RBUTTONDOWN: //右键压下 { drawing_eraser = true; Eraser = Rect(x,y,0,0); draw_Eraser(image,Eraser); } break; case CV_EVENT_LBUTTONUP: //左键弹起 { drawing_box = false; if(box.width<0) { box.x += box.width; box.width *= -1; } if(box.height<0) { box.y += box.height; box.height *= -1; } draw_box(image,box); } break; case CV_EVENT_RBUTTONUP: //右键弹起 { drawing_eraser = false; } break; } }