curve

Modeling hand movement as a 3D curve in Matlab/Java

由 独自空忆成欢 提交于 2019-12-08 18:01:05
问题 I just need some directions regarding a problem I have, where to look, etc.. I am using a movement tracking glove for one of my projects, which returns an X, Y and Z values for each finger and for the palm. What I would like to do is to first create a representation of each finger movements based on these coordinates, , and then attach each of them to the movement of the palm, to have a representation of the hand. This second step will be easy once I manage the first one, but... I don't

How to animate object on curve path in Kineticjs

由 让人想犯罪 __ 提交于 2019-12-08 10:37:51
问题 I would like to create a path as some curve, probably quad curve. It can be done similarly to http://www.html5canvastutorials.com/labs/html5-canvas-modify-curves-with-anchor-points-using-kineticjs/ Then I am able to create image object. However, I want to animate it along the created path (move it from start point to end point of the curve). I can use Javascript+Canvas+KineticJS(v 4.7.1). Is there any way, how to do it? I can't find any example which solves this. 回答1: Demo: http://jsfiddle

JGraphX - Custom Layoult - Curved Edges

由 强颜欢笑 提交于 2019-12-08 08:12:56
问题 I'm trying to customize a layout of jGraph. i Want to create curve edges, but I have a problem. Every time i create a group of vertex on JGraph, and I firing an event to update this graph, the edge is missing points compared to the previous state. Here is a exemple: http://i.stack.imgur.com/QrQIL.png Can someone help me? any idea? Here my codes: class CurveGraphView extends mxGraphView { public CurveGraphView(mxGraph graph) { super(graph); } /* Only override this if you want the label to

HTML5 Canvas: curve image along the path

由 三世轮回 提交于 2019-12-08 06:29:55
问题 I am trying to curve image along the path. Here what I got so long. I did this by cutting image into parts, placing them on a certain point on the line, and rotating them by tangent angle of that point. Everything is great, except if you look closely there are cracks between each image section, although each image begins exactly where previous ends. Can anybody help to get rid of those cracks. Here is jsBin. 回答1: Bezier 2nd & 3rd order ScanLine rendering Drawing an image with opacity in

Matlab code to draw a tangent to a curve

由 ∥☆過路亽．° 提交于 2019-12-08 05:49:02
问题 I need to draw a tangent to a curve at a particular point (say the point is chosen by the user). I have written a code that allows the user to manually pick up two points and then a line is drawn between them. But I would like to automate the process. Can someone please suggest any algorithms/already implemented matlab codes to do so? 回答1: Try the function below. Of course, it needs lots of tweaking to apply to your case, but I think this is roughtly what you want. function test hh = figure(1

How good is this interpolation method?

由 扶醉桌前 提交于 2019-12-08 03:47:41
问题 I came up with a custom interpolation method for my problem and I'd like to ask if there are any risks using it. I am not a math or programming expert, that's why I'd like a feedback :) Story: I was searching for a good curve-fit method for my data when I came up with an idea to interpolate the data. I am mixing paints together and making reflectance measurements with a spectrophotometer when the film is dry. I would like to calculate the required proportions of white and colored paints to

Akima interpolation algorithm [duplicate]

由 妖精的绣舞 提交于 2019-12-08 02:41:19
问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: Akima interpolation of an array of doubles I'm searching for an algorithm for Akima interpolation, but I can't find one after googling for a while. I write my application in Objective-C, but the programming language doesn't matter. It would be very kind if you can provide any code or links. Thanks 回答1: edit: see this SO answer for an updated version of the list below. original answer: Akima's original paper http

Converting an open curve to a list of ordered pixels: a Python test code with numpy

由 廉价感情. 提交于 2019-12-07 22:30:46
问题 I have the image of an open curve in a numpy array and I need to build a list of points coordinates ordered according to their position on the curve. I wrote a draft script using numpy and mahotas. It may not be optimal. I know that OpenCV can do this for a closed curve. Can OpenCV do the same (faster) with an open curve? For example, if the original curve is: [[0 0 0 0 0 0 0] [0 1 0 0 1 0 0] [0 0 1 0 0 1 0] [0 0 0 1 1 0 0] [0 0 0 0 0 0 0]] Using np.where(myarray==1) , I can get the indices

Simple Curve Fitting Implimentation in C++ (SVD Least Sqares Fit or similar)

由 自作多情 提交于 2019-12-07 03:50:38
问题 I have been scouring the internet for quite some time now, trying to find a simple, intuitive, and fast way to approximate a 2nd degree polynomial using 5 data points. I am using VC++ 2008. I have come across many libraries, such as cminipack, cmpfit, lmfit, etc... but none of them seem very intuitive and I have had a hard time implementing the code. Ultimately I have a set of discrete values put in a 1D array, and I am trying to find the 'virtual max point' by curve fitting the data and then

Matlab code to draw a tangent to a curve

由 房东的猫 提交于 2019-12-06 16:25:35
I need to draw a tangent to a curve at a particular point (say the point is chosen by the user). I have written a code that allows the user to manually pick up two points and then a line is drawn between them. But I would like to automate the process. Can someone please suggest any algorithms/already implemented matlab codes to do so? Try the function below. Of course, it needs lots of tweaking to apply to your case, but I think this is roughtly what you want. function test hh = figure(1); clf, hold on grid on x = 0:0.01:2*pi; f = @(x) sin(x); fprime = @(x) cos(x); plot(x, f(x), 'r') axis
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