code examples from SFPC 5.13

ofApp.cpp

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup(){
    kinect.setup();
    kinect.addDepthGenerator();
    kinect.setDepthColoring(COLORING_GREY);
    kinect.start();
    
    grayImage.allocate(kinect.getWidth(), kinect.getHeight());
    grayThreshNear.allocate(kinect.getWidth(), kinect.getHeight());
    grayThreshFar.allocate(kinect.getWidth(), kinect.getHeight());
    
    nearThreshold.set("near thresh", 11, 0, 255);
    farThreshold.set("far thresh", 0, 0, 255);
    minArea.set("min area", 1000, 0, 5000);
    maxArea.set("max area", 70000, 0, 150000);
    threshold.set("threshold", 10, 0, 100);
    persistence.set("persistence", 10, 0, 100);
    maxDistance.set("max distance", 10, 0, 100);
    skip.set("skip points", 20, 1, 30);
    
    gui.setup("kinect contours");
    gui.add(nearThreshold);
    gui.add(farThreshold);
    gui.add(minArea);
    gui.add(maxArea);
    gui.add(threshold);
    gui.add(persistence);
    gui.add(maxDistance);
    gui.add(skip);
    
}

//--------------------------------------------------------------
void ofApp::update(){
    kinect.update();
    
    if (kinect.isNewFrame()) {
        
        // after this, grayImage contains near&far thresholded depth pixels
        grayImage.setFromPixels(kinect.getDepthRawPixels());
        grayThreshNear = grayImage;
        grayThreshFar = grayImage;
        grayThreshNear.threshold(nearThreshold, true);
        grayThreshFar.threshold(farThreshold);
        cvAnd(grayThreshNear.getCvImage(), grayThreshFar.getCvImage(), grayImage.getCvImage(), NULL);
        grayImage.flagImageChanged();

        // find contours from grayImage
        contourFinder.setMinArea(minArea);
        contourFinder.setMaxArea(maxArea);
        contourFinder.setThreshold(threshold);
        contourFinder.getTracker().setPersistence(persistence);
        contourFinder.getTracker().setMaximumDistance(maxDistance);
        contourFinder.findContours(grayImage);
    }
}

//--------------------------------------------------------------
void ofApp::draw(){
    //grayImage.draw(0, 0);
    ofPushStyle();
    ofPushMatrix();

    ofBackground(0);
    ofScale((float)ofGetWidth()/640.0f, (float)ofGetHeight()/480.0f);
    
    int numContours = contourFinder.size();
    for (int i=0; i<numContours; i++) {
        vector<cv::Point> points = contourFinder.getContour(i);

        
        for (int k=0; k<5; k++) {
            ofNoFill();
            ofSetColor(ofRandom(255), ofRandom(255), ofRandom(255));
            ofSetLineWidth(4);
            ofBeginShape();
            for (int j=5*k; j<points.size(); j+=skip) {
                ofCurveVertex(points[j].x, points[j].y);
            }
            ofEndShape();
        }
        
    }
    
    ofSetColor(255);
    
    ofPopStyle();
    ofPopMatrix();

    
    gui.draw();
}

//--------------------------------------------------------------
void ofApp::keyPressed(int key){

}

//--------------------------------------------------------------
void ofApp::keyReleased(int key){

}

//--------------------------------------------------------------
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){

}

//--------------------------------------------------------------
void ofApp::mouseReleased(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::windowResized(int w, int h){

}

//--------------------------------------------------------------
void ofApp::gotMessage(ofMessage msg){

}

//--------------------------------------------------------------
void ofApp::dragEvent(ofDragInfo dragInfo){ 

}

ofApp.h

#pragma once

#include "ofMain.h"
#include "ofxOpenNI.h"
#include "ofxOpenCv.h"
#include "ofxCv.h"
#include "ofxGui.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 windowResized(int w, int h);
		void dragEvent(ofDragInfo dragInfo);
		void gotMessage(ofMessage msg);
		
    ofxOpenNI kinect;
    
    ofxCvGrayscaleImage grayImage;
    ofxCvGrayscaleImage grayThreshNear;
    ofxCvGrayscaleImage grayThreshFar;

    ofxCv::ContourFinder contourFinder;

    ofParameter<float> nearThreshold;
    ofParameter<float> farThreshold;
    
    ofParameter<float> minArea;
    ofParameter<float> maxArea;
    ofParameter<float> threshold;
    ofParameter<float> persistence;
    ofParameter<float> maxDistance;
    ofParameter<int> skip;
    
    ofxPanel gui;
    
};