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src/main.cpp

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+#include "ofMain.h"
+#include "ofApp.h"
+
+//========================================================================
+int main( ){
+	ofSetupOpenGL(1024,768,OF_WINDOW);			// <-------- setup the GL context
+
+	// this kicks off the running of my app
+	// can be OF_WINDOW or OF_FULLSCREEN
+	// pass in width and height too:
+	ofRunApp(new ofApp());
+
+}

src/ofApp.cpp

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+#include "ofApp.h"
+
+//--------------------------------------------------------------
+void ofApp::setup(){
+    webcam.setup(1280, 720);
+
+    contour.setMinAreaRadius(1);
+    contour.setMaxAreaRadius(5);
+    color_red_laser.set(185, 160, 160);
+    calibrated = 0;
+    key_pressed = 0;
+
+}
+
+//--------------------------------------------------------------
+void ofApp::update(){
+    webcam.update();
+
+    if (webcam.isFrameNew()) {
+        contour.setTargetColor(color);
+        contour.setThreshold(30);
+        contour.findContours(webcam);
+        selection = 0;
+        if (contour.size() != 0) {
+            for (i = 1; i < contour.size(); i++) {
+                if (contour.getContourArea(i) > contour.getContourArea(selection)) {
+                    selection = i;
+                }
+            }
+            if ((color_picked == 1) && (contour.getContourArea(selection) != 0)) {
+                center = contour.getCenter(selection);
+            }
+        }
+        
+        
+    }
+}
+
+//--------------------------------------------------------------
+void ofApp::draw(){
+    ofSetColor(255);
+    webcam.draw(0, 0);
+
+    contour.draw();
+    
+    ofFill();
+    ofSetColor(color);
+    ofDrawRectangle(webcam.getWidth(), 0, 128, 128);
+    if (color_picked == 1 && key_pressed == 0) {
+        SetCursorPos((center.x - x_offset) * x_scale, (center.y - y_offset) * y_scale);
+    }
+    
+}
+
+//--------------------------------------------------------------
+void ofApp::keyPressed(int key){
+    key_pressed = 1;
+}
+
+//--------------------------------------------------------------
+void ofApp::keyReleased(int key){
+    key_pressed = 0;
+}
+
+//--------------------------------------------------------------
+void ofApp::mouseMoved(int x, int y ){
+
+}
+
+//--------------------------------------------------------------
+void ofApp::mouseDragged(int x, int y, int button){
+
+}
+
+//--------------------------------------------------------------
+void ofApp::mousePressed(int x, int y, int button) {
+    if (calibrated == 4) {
+        color = webcam.getPixels().getColor(x, y);
+        printf("%i, %i, %i\n", color.r, color.g, color.b);
+        color_picked = 1;
+    }
+    if (calibrated != 4) {
+        if (calibrated == 0) {
+            GetCursorPos(&cp_top_left);
+        }
+        if (calibrated == 1) {
+            GetCursorPos(&cp_top_right);
+        }
+        if (calibrated == 2) {
+            GetCursorPos(&cp_bottom_right);
+        }
+        if (calibrated == 3) {
+            GetCursorPos(&cp_bottom_left);
+            y_offset = (cp_top_left.y + cp_top_right.y) / 2.0;
+
+            y_scale = 1080 / ((cp_bottom_left.y + cp_bottom_right.y) / 2.0);
+
+            x_offset = (cp_top_left.x + cp_bottom_left.x) / 2.0;
+
+            x_scale = 1920 / ((cp_top_right.x + cp_bottom_right.x) / 2.0);
+
+        }
+        calibrated++;
+    }
+}
+
+//--------------------------------------------------------------
+void ofApp::mouseReleased(int x, int y, int button){
+
+}
+
+//--------------------------------------------------------------
+void ofApp::mouseEntered(int x, int y){
+
+}
+
+//--------------------------------------------------------------
+void ofApp::mouseExited(int x, int y){
+
+}
+
+//--------------------------------------------------------------
+void ofApp::windowResized(int w, int h){
+
+}
+
+//--------------------------------------------------------------
+void ofApp::gotMessage(ofMessage msg){
+
+}
+
+//--------------------------------------------------------------
+void ofApp::dragEvent(ofDragInfo dragInfo){ 
+
+}

src/ofApp.h

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+#pragma once
+
+#include "ofMain.h"
+#include "ofxOpenCv.h"
+#include "ofxCv.h"
+#include "windows.h"
+
+class ofApp : public ofBaseApp{
+
+	public:
+		void setup();
+		void update();
+		void draw();
+
+		void keyPressed(int key);
+		void keyReleased(int key);
+		void mouseMoved(int x, int y );
+		void mouseDragged(int x, int y, int button);
+		void mousePressed(int x, int y, int button);
+		void mouseReleased(int x, int y, int button);
+		void mouseEntered(int x, int y);
+		void mouseExited(int x, int y);
+		void windowResized(int w, int h);
+		void dragEvent(ofDragInfo dragInfo);
+		void gotMessage(ofMessage msg);
+
+		ofVideoGrabber webcam;
+		ofxCv::ContourFinder contour;
+		cv::Point2f center;
+		ofColor color;
+		ofColor color_red_laser;
+		int color_picked;
+		int key_pressed;
+		int i;
+		int biggest_contour;
+		unsigned int selection;
+		int calibrated;
+		float y_scale;
+		float y_offset;
+		float x_scale;
+		float x_offset;
+		
+		POINT cp_top_left, cp_top_right, cp_bottom_left, cp_bottom_right;
+
+		
+};