How to calculate diameter or radius of the circle

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if (_shapeChecker.IsCircle(_edgePoint, out _center, out _radius))
            {


                Rectangle[] _rects = _blobCounter.GetObjectsRectangles();

                string _shapeString = "" + _shapeChecker.CheckShapeType(_edgePoint);
                Pen _pen = new Pen(Color.Red, ipenWidth);
                int _x = (int)_center.X;
                int _y = (int)_center.Y;
                _g.DrawString(_shapeString, _font, _brush, _x, _y);
                _g.DrawEllipse(_pen, (float)(_center.X - _radius),
                                     (float)(_center.Y - _radius),
                                     (float)(_radius * 2),
                                     (float)(_radius * 2));

                //size of rectange
                foreach (Rectangle rc in _rects)
                {
                    ///for debug
                    //System.Diagnostics.Debug.WriteLine(
                    //    string.Format("Circle size: ({0}, {1})", rc.Width, rc.Height));

                    iFeatureWidth = rc.Width;
                    double dis = FindDistance(iFeatureWidth);
                    //textBox1.Text = dis.ToString("N2");
                    _g.DrawString(dis.ToString("N2"), _font, _brush, _x, _y + 60);

                    //  textBox1.Text= dis.ToString("N2"), _font, _brush, _x, _y + 60);


                    // get bounding rectangle of the points list
                    IntPoint minXY, maxXY;
                    PointsCloud.GetBoundingRectangle(_edgePoint, out minXY, out maxXY);
                    // get cloud's size
                    IntPoint cloudSize = maxXY - minXY;
                    // calculate center point
                    DoublePoint center = minXY + (DoublePoint)cloudSize / 2;
                    // calculate radius

                        float radius = ((float)cloudSize.X + cloudSize.Y) / 4;
                        textBox2.Text = Convert.ToString(radius);
                        textBox3.Text = dis.ToString();


                }
            }

What I have tried:

float radius = ((float)cloudSize.X + cloudSize.Y) / 4;
                         textBox2.Text = Convert.ToString(radius);
                         textBox3.Text = dis.ToString();

Posted 13-Mar-18 22:00pm

Tusshar Samrit

Updated 13-Mar-18 22:49pm

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Comments

Richard MacCutchan 14-Mar-18 4:06am

What is the question?

Tusshar Samrit 14-Mar-18 4:08am

i m getting wrong value or radius

Richard MacCutchan 14-Mar-18 4:11am

What does that mean?

OriginalGriff 14-Mar-18 4:13am

Remember that we have no idea what data you are feeding that, or what you expect to get - so give us examples, show us what you input, what results you expect, and what values you get. And we have no idea what your _shapeChecker.IsCircle method does - except it appears to calculate the center and radius, so it may be relevant to your "wrong value or radius" problem.

Tusshar Samrit 14-Mar-18 4:54am

https://drive.google.com/open?id=1LhfQZRa6J4b9cbtkiMjisAx-fd-5Tyh-

Patrice T 14-Mar-18 4:43am

Define wrong result.
Show a sample input and actual and expected result.

Tusshar Samrit 14-Mar-18 4:55am

this is aforge project of object detection only i m trying to calculate radius of circle which i dont have any idea how to do it please do help me sir

OriginalGriff 14-Mar-18 4:10am

This is not a good question - we cannot work out from that little what you are trying to do.
Remember that we can't see your screen, access your HDD, or read your mind - we only get exactly what you type to work with.
Use the "Improve question" widget to edit your question and provide better information.

Tusshar Samrit 14-Mar-18 4:53am

https://drive.google.com/open?id=1LhfQZRa6J4b9cbtkiMjisAx-fd-5Tyh-
link of my project

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den2k88 · Answer 1 · 2018-03-13T22:50:00

You put the question in a way that is all guess work. It turns out that I'm bored so I will try to guess.

You found the bounding rectangle of something you assume or know for certain is a circle. Then you said: the radius of the circle is half one of the sides. Which is logical.

Why did you sum X and Y and then divided by 4 though? It makes no sense at all as it would work only if the rectangle is actyally a sqaure (X = Y) but in that case just pick one and divide by 2, why bother with a sum?

The main logical problem here is that you have a bounding RECTANGLE, not a square. You should take the shortest of its sides and divide by half, so

C++

float radius = ((float)min(cloudSize.X, cloudSize.Y)) / 2;

(I know little of C# framework so I used min as f it was C++, use the minimum function you prefer).