#include <opencv2/core/core.hpp> #include <opencv2/highgui/highgui.hpp> #include <opencv2/imgproc/imgproc.hpp> #include <iostream>using namespace std; using namespace cv;#define WINDOW_NAME "矩形拖動"Mat src_image; Mat dst_image; Rect rect; Point pt; bool flag_mouse_contained;void Mouse_Callback(int event, int x, int y, int flags, void* userdata) {switch (event){case EVENT_LBUTTONDOWN:if (rect.contains(Point(x, y))){flag_mouse_contained = true;pt = Point(x, y);}break;case EVENT_MOUSEMOVE:if (flag_mouse_contained == true){rect.x += (x - pt.x); //當前鼠標坐標減去上一次回調事件的鼠標坐標rect.y += (y - pt.y);}break;case EVENT_LBUTTONUP:flag_mouse_contained = false;break;}pt = Point(x, y); //記錄當前鼠標坐標用于下一次回調事件 }int main(int argc, char** argv) {flag_mouse_contained = false;src_image = Mat(256, 256, CV_32FC3, Scalar(255, 255, 255));namedWindow(WINDOW_NAME, WINDOW_AUTOSIZE);setMouseCallback(WINDOW_NAME, Mouse_Callback, 0);rect = Rect(50, 50, 50, 50);src_image.copyTo(dst_image); //類似于winform中的Paint事件，只修改dst_image，scr_image保持不變rectangle(dst_image, rect, Scalar(0, 0, 0));imshow(WINDOW_NAME, dst_image);while (1){if (flag_mouse_contained == true){src_image.copyTo(dst_image);rectangle(dst_image, rect, Scalar(0, 0, 0));imshow(WINDOW_NAME, dst_image);}if (waitKey(10) == 27) //等待事件必須大于0，如果小于等于0，則程序會進入無限等待 {return 0;}}//cvDrawRect()return 0; }

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轉載于:https://www.cnblogs.com/canyeweiwei/p/10504588.html

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