From ab5e941dcaedcf2cc896eed1ea257c59780fdb59 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Tue, 17 Aug 2021 12:38:14 -0400
Subject: Implemented parts of mouse click event

---
 src/labeller.cc |  5 +++++
 src/labeller.h  |  4 ++++
 src/playback.cc |  8 +++++++-
 src/playback.h  |  6 +++++-
 src/ui.cc       | 48 ++++++++++++++++++++++++++++++++++++------------
 5 files changed, 57 insertions(+), 14 deletions(-)

diff --git a/src/labeller.cc b/src/labeller.cc
index f7fa69e..ea72db0 100644
--- a/src/labeller.cc
+++ b/src/labeller.cc
@@ -54,6 +54,11 @@ namespace backend {
         return labs;
     }
 
+    std::vector<label>& labeller::getEditableLabels() {
+        return data->annotations;
+    }
+
+
     std::vector<std::string> labeller::getLabels() const {
         return data->labels;
     }
diff --git a/src/labeller.h b/src/labeller.h
index e0dc090..cf108f5 100644
--- a/src/labeller.h
+++ b/src/labeller.h
@@ -10,6 +10,9 @@ namespace backend {
 
     struct rect {
         int x1=0, x2=0, y1=0, y2=0;
+        bool nonzero() const {
+            return (x1 != 0 || x1 != 0 || y1 != 0 || y2 != 0);
+        }
     };
 
     struct label {
@@ -24,6 +27,7 @@ namespace backend {
         public:
             labeller(const std::filesystem::path& savepath);
             std::pair<label, label> getSurrounding(double time) const;
+            std::vector<label>& getEditableLabels();
             std::vector<std::string> getLabels() const;
             std::vector<std::string> getRectangleLabels() const;
             void applyLabel(std::string name, double time);
diff --git a/src/playback.cc b/src/playback.cc
index 8839528..bbc2649 100644
--- a/src/playback.cc
+++ b/src/playback.cc
@@ -1,4 +1,5 @@
 #include "playback.h"
+#include "labeller.h"
 #include <opencv2/opencv.hpp>
 #include <vector>
 #include <stdexcept>
@@ -31,7 +32,12 @@ namespace frontend {
         cap.release();
     }
 
-    void playback::display(const std::string& windowName) const {
+    void playback::display(const std::string& windowName, const backend::rect &r) const {
+        cv::Mat curr(data->images[data->frameNum]);
+        if(r.nonzero()) {
+            // Update with the rectangle
+            cv::rectangle(curr, cv::Point(r.x1, r.y1), cv::Point(r.x2, r.y2), cv::Scalar(255, 0, 0), 2, cv::LINE_8);
+        }
         cv::imshow(windowName, data->images[data->frameNum]);
     }
 
diff --git a/src/playback.h b/src/playback.h
index 2fd5fa9..3f6e67f 100644
--- a/src/playback.h
+++ b/src/playback.h
@@ -3,12 +3,16 @@
 #include <memory>
 #include <string>
 
+namespace backend {
+    struct rect;
+}
+
 namespace frontend {
     struct playback_impl;
     class playback {
         public:
             playback(const std::filesystem::path& video, std::size_t frameCap=0);
-            void display(const std::string& windowName) const;
+            void display(const std::string& windowName, const backend::rect &r) const;
             bool seekFrame(std::size_t frameNum);
             std::size_t getFrame() const;
             bool seekTime(double time);
diff --git a/src/ui.cc b/src/ui.cc
index f852bde..9b24815 100644
--- a/src/ui.cc
+++ b/src/ui.cc
@@ -73,29 +73,52 @@ namespace frontend {
         return false;
     }
 
+    backend::label* getCurrentRectLabel(ui_impl *data) {
+        auto labs = data->llr->getEditableLabels();
+        for(auto rit = labs.rbegin(); rit != labs.rend(); rit++) {
+            if(rit->location.nonzero()) {
+                return &(*rit);
+            }
+        }
+        return nullptr;
+    }
+
     void mouseCallback(int event, int x, int y, int flags, void* userdata) {
         // userdata is actually a &shared_ptr<ui_impl>
-        shared_ptr<ui_impl> data = (shared_ptr<ui_impl>) *userdata;
+        auto data = static_cast<ui_impl*>(userdata);
         static bool mouseDown = false;
         // We're interested in left button down/up and movement when down
         if(event == cv::EVENT_LBUTTONDOWN) {
             // If the current frame doesn't have a rectangle label, then make one
             mouseDown = true;
-            double time = data->pb->getTime()
-            auto labs = data->llr->getSurrounding(time);
-            backend::label current;
-            if(labs.first.time == time) {
-                current = labs.first;
-            } else if(labs.second.time == time) {
-                current = labs.second;
-            } else {
-                
+            double time = data->pb->getTime();
+            auto lab = getCurrentRectLabel(data);
+            if(lab && lab->time == time) {
+                // Use this one
+            } else { // Make one
+                // Try to use the first rectangle annotation, fall back on normal, then "Rectangle"
+                std::string name = "Rectangle";
+                if(!data->llr->getRectangleLabels().empty()) {
+                    name = data->llr->getRectangleLabels()[0];
+                } else if(!data->llr->getLabels().empty()) {
+                    name = data->llr->getLabels()[0];
+                }
+                data->llr->applyLabel(name, time);
+                lab = &data->llr->getEditableLabels().back();
             }
+            lab->location.x1 = x;
+            lab->location.y1 = y;
         } else if(event == cv::EVENT_LBUTTONUP) {
             // Mouse is no longer down
             mouseDown = false;
         } else if(event == cv::EVENT_MOUSEMOVE) {
             // If the mouse is down, update x2 and y2 of current window
+            if(mouseDown) {
+                auto lab = getCurrentRectLabel(data); // It will be valid! TODO: Will it?
+                std::cout << "Updating location from " << lab->location.x2 << ", " << lab->location.y2 << " to " << x << ", " << y << "\n";
+                lab->location.x2 = x;
+                lab->location.y2 = y;
+            }
         }
     }
 
@@ -111,9 +134,10 @@ namespace frontend {
         ioctl(STDOUT_FILENO, TIOCGWINSZ, &size);
         int cols = size.ws_col;
         // Register mouse callback
-        cv::setMouseCallback("Video", mouseCallback, &data);
+        data->pb->display("Video", (getCurrentRectLabel(data.get()))? getCurrentRectLabel(data.get())->location : backend::rect());
+        cv::setMouseCallback("Video", mouseCallback, data.get());
         while(true) {
-            data->pb->display("Video");
+            data->pb->display("Video", (getCurrentRectLabel(data.get()))? getCurrentRectLabel(data.get())->location : backend::rect());
             data->pb->interFrameSleep();
             if(handleKey(cv::pollKey(), data)) {
                 break;
-- 
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