curve

问题 I want to give my users an easy way to visually trace a route on a map or a picture. The solution must let the users add control points that they can use to put bends into the route. It should work with html5 canvas - I currently use the Konvajs library so a solution that uses this would be good. In the interests of sharing & learning, if you can suggest solutions using other HTML5 canvas libraries that would be good to see too. Note: This is not the original question posed. However it

问题 I want to give my users an easy way to visually trace a route on a map or a picture. The solution must let the users add control points that they can use to put bends into the route. It should work with html5 canvas - I currently use the Konvajs library so a solution that uses this would be good. In the interests of sharing & learning, if you can suggest solutions using other HTML5 canvas libraries that would be good to see too. Note: This is not the original question posed. However it

问题 I want to give my users an easy way to visually trace a route on a map or a picture. The solution must let the users add control points that they can use to put bends into the route. It should work with html5 canvas - I currently use the Konvajs library so a solution that uses this would be good. In the interests of sharing & learning, if you can suggest solutions using other HTML5 canvas libraries that would be good to see too. Note: This is not the original question posed. However it

问题 I have a curve generated by a D3.js line generating function with interpolate set as "basis". The problem is that the line generated only touches the first and last point given into the line generating function and does not pass through the ones in between. I am aware that these are treated as control points to generate the b-spline curve, but what I am looking for is a way to "project"/calculate the control points so that the curve does go through every point in my path array. These in

问题 I have a curve with a lot of points, resulting in a slowing down at GUI level. I would like to apply an algorithm which remove adjacent points which are too close of each other (in term of values, and so can be considered useless) Is there any famous algorithm to do this ? I'm using C# and ZedGraph 回答1: You can use Douglas-Peucker algorithm to reduce number of points and save the curve shape. C# implementation can be found here 回答2: I'm not a professional, but I thought that you can do this

问题 I have a curve with a lot of points, resulting in a slowing down at GUI level. I would like to apply an algorithm which remove adjacent points which are too close of each other (in term of values, and so can be considered useless) Is there any famous algorithm to do this ? I'm using C# and ZedGraph 回答1: You can use Douglas-Peucker algorithm to reduce number of points and save the curve shape. C# implementation can be found here 回答2: I'm not a professional, but I thought that you can do this

问题 I have been looking for any example code for drawing a UILabel (or just an NSString or something) on a curved path, but have come up empty handed. Does anyone know whether it's possible to draw text on a curved path, like a circle or something, without using separate pieces of graphics for every single letter? 回答1: Split the String into letters and then so something like this: How do I draw an NSString at an angle? increasing the angle and changing the position after every letter. 来源： https:/

问题 I have been looking for any example code for drawing a UILabel (or just an NSString or something) on a curved path, but have come up empty handed. Does anyone know whether it's possible to draw text on a curved path, like a circle or something, without using separate pieces of graphics for every single letter? 回答1: Split the String into letters and then so something like this: How do I draw an NSString at an angle? increasing the angle and changing the position after every letter. 来源： https:/

问题 I am trying to find an algorithm to calculate the bounding box of a given cubic bezier curve. The curve is in 3D space. Is there a mathematic way to do this except of sampling points on the curve and calculating the bounding box of these points? 回答1: Most of this is addressed in An algorithm to find bounding box of closed bezier curves? except here we have cubic Beziers and there they were dealing with quadratic Bezier curves. Essentially you need to take the derivatives of each of the

问题 I want to plot individual data points with error bars on a plot, but I don't want to have the curve. How can I do this? Are there some 'invisible' line style or can I set the line style colourless (but the marker still has to be visible)? So this is the graph I have right now: plt.errorbar(x5,y5,yerr=error5, fmt='o') plt.errorbar(x3,y3,yerr=error3, fmt='o') plt.plot(x3_true,y3_true, 'r--', label=(r'$\lambda = 0.3$')) plot(x5_true, y5_true, 'b--', label=(r'$\lambda = 0.5$')) plt.plot(x5,y5,