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Why I can't create a polylines

asked 2017-08-09 05:21:05 -0500

choro gravatar image

updated 2017-08-09 05:22:06 -0500

t2 is a vector(Point2f). When I create a circle that's success. but can't create a polylines

     for (int sn=0; sn<2; sn++){
            mat.copyTo(image);
            for(int ar=0; ar<jnt[0]

.size(); ar++){
            t1 = pointz.at(ar);
            t0 = jnt[ax].at(ar); //ref
            t1.x = c60 * (t0.x - t1.x) - s60 * (t0.y - t1.y) + t1.x;
            t1.y =  s60 * (t0.x - t1.x) + c60 * (t0.y - t1.y) + t1.y;
            t.push_back(t1);
        }
        t2=t;
        t.clear();
        etrans = evec.t();
        Qnew = Mat (t2).reshape(0,5);
        yminq = Qnew - q_bar;
        b_bar = etrans.mul(yminq);
        q_new = q_bar +( b_bar.mul(evec));
        qbaru = q_new.reshape(0,1);
        y_bar = qbaru;
        pointz = t2;
        q_bar = Mat(t2).reshape(0,5);
        waitKey(1000);

    }
    for(int ao=0; ao<t2.size(); ao++){
        Point pt = t2.at(ao);
        circle(image,pt,1,Scalar(0,0,255),2);
    }
    cvtColor(image, image, COLOR_BGR2GRAY);
    polylines(image,t2,false,Scalar(255,255,255),2,150,0);
    imshow("Fitting",image);

this is the error

OpenCV Error: Assertion failed (p.checkVector(2, CV_32S) >= 0) in cv::polylines, file ........\opencv\modules\core\src\drawing.cpp, line 2067

thankyou :)

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answered 2017-08-09 06:24:43 -0500

berak gravatar image

unfortunately, polylines expects a vector<Point>, not a vector<Point2f>.

while you can easily cast a single Point2f to Point, not so with a whole vector.

so, either draw single lines:

for(int ao=0; ao<t2.size()-1; ao++){
    Point p0 = t2.at(ao);
    Point p1 = t2.at(ao+1);
    line(image,p0,p1,Scalar(0,0,255),2);
}

or copy to a vector<Point> :

vector<Point> pt;
for(int ao=0; ao<t2.size(); ao++){
    pt.push_back( t2.at(ao) );
}
polylines(image,pt,false,Scalar(255,255,255),2,150,0);
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thank you very much :))

choro gravatar imagechoro ( 2017-08-09 08:29:56 -0500 )edit

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Asked: 2017-08-09 05:21:05 -0500

Seen: 5,167 times

Last updated: Aug 09 '17