Using ofParameter to modify ofRect within a class with Gui

@Gallo wrote:

Hello,

I am stuck in my project. A bit hard to explain but i will try to make it clear.

I am using a kinect to detect blobs.
I have two classes.

one that handles the kinect sensor :

class kinectTracker {
public:
    
    kinectTracker();
    ~kinectTracker();
                                                                                    
    void setup();
    void update();
    void draw();
    void draw(float _x, float _y, float _w, float _h);
    void drawDepth();
    void drawDepth(float _x, float _y, float _w, float _h);
    int getNbBlobs();

    ROI roi;
    
    //---------- Parameters ----------//
    
    ofParameterGroup parameters;
    ofParameter<float> nearThreshValue;
    ofParameter<float> farThreshValue;
    ofParameter<float> minBlobSize;
    ofParameter<bool> bDilate;
    ofParameter<bool> bErode;
    ofParameter<int> nbDilate;
    ofParameter<int> nbErode;
    ofParameter<ofVec3f> pos; // x, y and z position of blob
    
private:
    
    ofxKinect kinect;
            
    //---------- blob tracking with ofxKinect and ofxOpenCV ----------//
    
    ofxCvGrayscaleImage depthImage; // grayscale depth image
    ofxCvGrayscaleImage nearThresholdImage;
    ofxCvGrayscaleImage farThresholdImage;
    ofxCvContourFinder contourFinder; // blob detection
};

and one to handle the ROI :

    class ROI : public ofBaseDraws, public ofRectangle {
    
public:
    void draw(float _x,float _y) {
        draw(_x, _y, getWidth(), getHeight());
    }
    
    void draw(float _x,float _y,float w, float h)  {
        
        ofPushMatrix();
        
        ofTranslate(_x, _y);
        ofScale(w/CAM_WIDTH, h/CAM_HEIGHT);
        
        ofPushStyle();
        ofSetColor(255, 0, 0);
        ofNoFill();
        ofSetLineWidth(1);
        ofRect(*this);
        ofPopStyle();
        
        ofPopMatrix();
    }
    
    float getWidth()  {
        return CAM_WIDTH;
    }
    
    float getHeight()  {
        return CAM_HEIGHT;
    }
};

Class ROI handles and draw region of interest in order to select a detection area.
As you can see this ROI integrates an ofRect to set and draw this area.

In ofApp i use a kinectTracker object

 kinectTracker cvKinect;

I would like to be able to change the values of the ofRect from the ofApp with ofxGui using ofParameter if possible.

I was able to use the GUI to change kinect parameters using ofParameterGroup but i don't know how to "publish" ROI parameters to access them from the ofApp GUI...

I had a previous version of this app using ofxUI instead of ofxGui and i was able to change ROI coordinates using

configUI1->addSlider("ROI - position X", 0.f, CAM_WIDTH, &cvKinect.roi.x);
configUI1->addSlider("ROI - position Y", 0.f, CAM_HEIGHT, &cvKinect.roi.y);
configUI1->addSlider("ROI - width", 0.f, CAM_WIDTH, &cvKinect.roi.width);
configUI1->addSlider("ROI - height", 0.f, CAM_HEIGHT, &cvKinect.roi.height);

Hope i made myself clear.

any contribution appreciated.

thanks a lot

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