From 89ec4030ba4e426e6e7992336a6665ef9d37ec48 Mon Sep 17 00:00:00 2001
From: Patrick Simianer <p@simianer.de>
Date: Fri, 30 Sep 2016 13:06:38 +0200
Subject: simple image cropping tool

---
 crop.cpp | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 crop.cpp

diff --git a/crop.cpp b/crop.cpp
new file mode 100644
index 0000000..8f570e8
--- /dev/null
+++ b/crop.cpp
@@ -0,0 +1,86 @@
+#include <iostream>
+#include <vector>
+
+#include "opencv2/opencv.hpp"
+
+using namespace std;
+using namespace cv;
+
+Mat src, img, roi;
+Rect crop_rect(0,0,0,0);
+vector<cv::Point> pt;
+const char* win_name="crop";
+
+void
+show_img ()
+{
+  img = src.clone();
+  if(crop_rect.width > 0 && crop_rect.height > 0){
+    roi = src(crop_rect);
+    cout << crop_rect.width << " " << crop_rect.height << endl;
+    imshow("cropped", roi);
+  }
+
+  //rectangle(img, crop_rect, Scalar(0,255,0), 1, 8, 0 );
+  imshow(win_name,img);
+}
+
+void
+mouse_handler (int event, int x, int y, int f, void*)
+{
+  switch (event)
+  {
+    case CV_EVENT_LBUTTONDOWN:
+      circle(src, Point(x,y), 4, 0);
+      pt.push_back(cv::Point(x,y));
+      show_img();
+      break;
+  }
+
+  if (pt.size() == 2) {
+    //circle(src, Point(pt[1].x, pt[0].y), 4, 0);
+    //circle(src, Point(pt[0].x, pt[1].y), 4, 0);
+    crop_rect = Rect(pt[0], pt[1]);
+    show_img();
+  }
+}
+
+int
+main (int argc, char** argv)
+{
+  namedWindow(win_name, WINDOW_NORMAL);
+  namedWindow("cropped", WINDOW_NORMAL);
+  setMouseCallback(win_name, mouse_handler, NULL);
+
+  for (size_t i=1; i<argc; i++) {
+    string imgn(argv[i]);
+    src=imread(argv[i],1);
+    //destroyWindow(win_name);
+    destroyWindow("cropped");
+    crop_rect.x = 0;
+    crop_rect.y = 0;
+    crop_rect.height = 0;
+    crop_rect.width = 0;
+    pt.clear();
+
+    imshow(win_name,src);
+
+    while(1){
+      char c=waitKey();
+      if(c == 's' && roi.data){
+        imshow(win_name, src);
+        roi=src(crop_rect);
+        imwrite(imgn+"-crop.jpg", roi);
+        cout << " saved " << imgn <<endl;
+        break;
+      }
+
+      if(c==27) break;
+
+      show_img();
+    }
+  }
+
+  return 0;
+}
+
-- 
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