python,scipy,ellipse,astronomy,minimization

First, you have a typo in your objective function that prevents optimization of one of the variables: dummy_ellipse = generate_ellipse(...,dz,dy,dz) should be dummy_ellipse = generate_ellipse(...,dx,dy,dz) Also, taking sqrt out and minimizing the sum of squared euclidean distances makes it numerically somewhat easier for the optimizer. Your objective function is also...

The "simplest" way I know to do that is to simply apply a RadialGradientBrush to the Ellipse's Stroke, putting your black color at Offset 0.5 and green colors just around. The problem being that "just around" depends on your ellipse's stroke thickness; you will have to modify your RadialGradientBrush's RadiusX...

Using the is keyword you can check which type an object is. if(rect is Rectangle) ...

vb.net,lua,draw,pixels,ellipse

Here's what I came up with for my CPU renderer in the past. It's very efficient and very simple too. It relies on the mathematical definition of the ellipse, so the ellipse is drawn centered at x,y and has the width and height defined from the center, not from the...

matlab,regression,curve-fitting,ellipse,best-fit-curve

You can also try with fminsearch, but to avoid falling on local minima you will need a good starting point given the amount of coefficients (try to eliminate some of them). Here is an example with a 2D ellipse: % implicit equation fxyc = @(x, y, c_) c_(1)*x.^2 + c_(2).*y.^2...

Ok, I managed to find a solution for the filled ellipse by checking if the pixel from the second half is gonna be drawn in the x-range of the first half of the ellipse. function drawellipse(xc, yc, w, h, dofill) --trouble with the size, 1 pixel to large on x...

java,user-interface,javafx,scenebuilder,ellipse

There is no grouping mechanism to perform a single action on all of the members of the same group. On the contrary, you can have a single group/container to hold all your controls and apply the same action to each of its member. For example, lets say I have a...

Animating inside a drawRect is never recommended. Why not just put an UIView on the place where you want it and animate the coordinates of that view? The UIView could be a custom view responding to touch and then triggering the drawRect with a new color. The parent view where...

matlab,plot,ellipse,colormap,contourf

Here is a way using built-in colormaps in Matlab (look here for a complete list). The trick is to create a n x 3 array where n is the number of colors you wish to represent. Here it's the number of ellipses. You can create a colormap like so: MyColorMap...

c#,exception,graphics,drawing,ellipse

Since you are passing in the PaintEventArgs e you can and should use its e.Graphics! And since you didn't create it, don't dispose of it! But those Pens and Brushes you create you should disposed of or better yet, create them inside a using clause! For the SolidBrush we can...

photoshop,circle,shapes,ellipse

It can be achieved in the following manner: 1) Enable the ruler by pressing (ctrl+R) or (cmd+R) 2) Assuming you know the exact position of the center of the shape in pixels, change the measurement to pixels. Or any other unit. 3) Go under [View->New Guide] and place horizontal and...

java,arraylist,javafx,circle,ellipse

May be you can try a List of Shape which will accept all of them: List<Shape> shapes = new ArrayList<Shape>(); Now you can add whatever shape you want to add: shapes.add(body); shapes.add(leg1); shapes.add(leg2); etc. Here is the complete example which you can test: public class WiLi_Horse { Ellipse body; Rectangle...

c++,opengl,ellipse,drawellipse

I think you're encountering overflow. I played with your code. While I never saw exactly the same "lemon" type shapes from your pictures, things definitely fell apart at large sizes, and it was caused by overflowing the range of the int variables used in the code. For example, look at...

The angle between the major axis of the ellipse and the x-axis is given by the Orientation property of regionprops. The angle is given in degrees and will lie in the range between -90° and +90°. I assume you are using exactly the mentioned code. There the Orientation value is...

ios,core-graphics,quartz-2d,uibezierpath,ellipse

Often the easiest way is to put this on a CAShapeLayer and then rotate the layer. The math for that tends to be very simple (particularly if you want to change the transform later). But you can also just rotate the path directly before drawing it by creating a rotation...

You're actually pretty close; you made a small mistake in the definition of the x value and simply need to swap data(i,8) with data(i,7). i.e. change that line: x = data(i,7)/2 * cos(theta) * cos(data(i,9)) - data(i,8)/2 * sin(theta) * sin(data(i,9)) + data(i,5); for that one: x = data(i,8)/2 *...

javascript,css,css3,animation,ellipse

you should take a look to this Jquery plugin : https://github.com/CSS-Tricks/jQuery-Circulate-Plugin I think this could do the job ! Edit : the demo don't work on css-tricks.com, you need to download it....

One way to approximate the intersection area is by discretization on the unit area. Let's assume each ellipse is represented by four parameters x0, y0, a and b such that el( x0, y0, a, b ): ( (x-x0)/a )^2 + ( (y-y0)/b )^2 <= 1 Now we can estimate h...

c++,opencv,image-processing,ellipse

Can I ask what this is for? I am doing similar research in the attempt to make a fiducial marker. The problem from my research is that: lambda1 = (m20 + m02)/2 + sqrt(4*m11*m11 - (m20 - m02)*(m20 - m02)); should actually be: lambda1 = srqt((m20 + m02)/2 +...

An alternative to drawing an Ellipse control is a Path with an EllipseGeometry: <Path Stroke="Black" StrokeThickness="1"> <Path.Data> <EllipseGeometry Center="100,100" RadiusX="100" RadiusY="100"/> </Path.Data> </Path> ...

xaml,windows-runtime,microsoft-metro,rendering,ellipse

You're not seeing different StrokeThickness what you are seeing is 2 or more Ellipse on top of each other. But you're probably wondering why it appears "Thicker", it is because antialiasing on the outer/inner edges of the ellipse. When you have two or more they will blend with each other,...

To expand on my comment, try something like this (untested) code: graphGraphics = e.Graphics; graphGraphics.FillEllipse(new SolidBrush(Color.White), this.graphBoundries); graphGraphics.DrawEllipse(graphPen, this.graphBoundries); GraphicsPath clipPath = new GraphicsPath(); clipPath.AddEllipse(this.graphBoundaries); graphGraphics.SetClip(clipPath, CombineMode.Replace); // draw your line ...

Use a picturebox with transparent background and your ellipse already drawn from an image file (per example) and put it at the mouse coordinates. But beware, this will yield a lot of troubles with your code, you are drawing to the form, when it gets refreshed everything will be cleared...

matlab,mathematical-optimization,ellipse,data-fitting

This answer is not a direct fit in 3D, it instead involves first a rotation of the data so that the plane of the points coincides with the xy plane, then a fit to the data in 2D. % input: data, a N x 3 array with one set of...

From OpenCV Documentation: http://docs.opencv.org/modules/imgproc/doc/structural_analysis_and_shape_descriptors.html?highlight=fitellipse#fitellipse The function calculates the ellipse that fits (in a least-squares sense) a set of 2D points best of all. As long as you pass a contour it will fit an ellipse to it. What does this mean? Well consider a list of points. If I passed...

qt,click,qgraphicsscene,ellipse

Create custom scene and reimplement mousePressEvent. For example: Header: #ifndef GRAPHICSSCENE_H #define GRAPHICSSCENE_H #include <QGraphicsScene> #include <QPoint> #include <QMouseEvent> class GraphicsScene : public QGraphicsScene { Q_OBJECT public: explicit GraphicsScene(QObject *parent = 0); ~GraphicsScene(); signals: protected: void mousePressEvent(QGraphicsSceneMouseEvent *event); }; #endif // GRAPHICSSCENE_H Cpp: void GraphicsScene::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent) { if (mouseEvent->button() ==...

There is no stat_ellipse(...) in the ggplot package, so you must have retreived it from somewhere else. Care to share?? There are at least two versions that I am aware of, here, and here. Neither of these seem to work with your dataset, which is odd because both have worked...

See the setFrame() methods of RectangulerShape. For example: col.setFrame(x, y, width, height); ...

matlab,geolocation,geocoding,ellipse,hour

function [hx,hy] = calcHourCoords(ra,rb) %input: %ra, rb length of semi-axis in ellipse %output: %hx, hy coords of hour's plot hourAngle = 15*pi/180; step = 0; for i=1:1:24 hx(i)= ra * sin(step); hy(i)= rb * cos(step); step = step+hourAngle; end end ...

c++,rotation,angle,ellipse,dxf

You are ignoring the translation of the ellipse, that is, that the center may not be placed at (0, 0). If that where the case, your solution would be OK. To undo the effect of the translation, simply substract the coordinates for the center: auto angle = std::atan2(ellipse.my - ellipse.cy,...

I dont know what is your dataset is... So I have created random one... I used plotrix package for this... library(plotrix) df = data.frame(x=sample(1:25),y=sample(1:25,replace=T,25)) plot(df,col='blue') draw.ellipse(x= c(15), y= c(15), c(4), c(3), border = 'black', lwd = 2) draw.ellipse(x= c(15), y= c(15), c(5), c(4), border = 'green', lwd = 2) draw.ellipse(x=...