bezier

LibGDX guidance - sprite tracing 2D infinite random bezier curve

亡梦爱人 提交于 2019-12-04 11:43:55
I've been able to apply a smooth animation to my sprite and control it using the accelerometer. My sprite is fixed to move left and right along the x-aixs. From here, I need to figure out how to create a vertical infinite wavy line for the sprite to attempt to trace. the aim of my game is for the user to control the sprite's left/right movement with the accelerometer in an attempt to trace the never ending wavy line as best they can, whilst the sprite and camera both move in a vertical direction to simulate "moving along the line." It would be ideal if the line was randomly generated. I've

BezierPath and masking

最后都变了- 提交于 2019-12-04 11:00:43
I want to set up UIBezierPath as mask into my view: The goal is something like this: So i draw the View with frame: CGFloat round = 80; UIView *myView = [[UIView alloc] initWithFrame:CGRectMake(self.frame.size.width/2-105, 0, 210, 60+round)]; myView.backgroundColor = [UIColor redColor]; And then try to add BezierMask: UIBezierPath *aPath = [UIBezierPath bezierPath]; CGSize viewSize = CGSizeMake(myView.frame.size.width, myView.frame.size.height); //(210,80) CGPoint startPoint = CGPointMake(myView.frame.origin.x,myView.frame.origin.y); //(279,0) [aPath moveToPoint:startPoint]; //(279,0) [aPath

Cubic bezier curve segment

随声附和 提交于 2019-12-04 10:41:08
If I have the 4 points describing a Bezier curve P1, P2, P3, P4 (where P1 and P4 are the end points of the curve and P2 and P3 are the control points of the curve), how could I find the points that describes only a segment of this bezier curve? I found this answer which is exactly what I am looking for but the answer seems wrong. If I set t0=0 and t1=1 in the equations which should represent the entire bezier curve, the resulting points are not valid. They are not equal to the original points. It seems that the solution is related to the De Casteljau's algorithm, but I can't understand how it

Bezier curve approximation for large amount of points

折月煮酒 提交于 2019-12-04 09:56:28
I have about hundred points, that I want to approximate with Bezier curve, but if there are more than 25 points (or something like that), factorial counting in number of combination causes number overflow. Is there a way of approximating such amount of points in a Bezier-like way (smooth curve without passing through all points, except first and last)? Or do I need to choose another approximation algorithm with the same effect? I'm using default swing drawing tools. P.S. English is not native for me, so probably I've used wrong math terms somewhere. Do you want to get one Bezier curve fitting

Is it possible to thicken a quadratic Bézier curve using the GPU only?

筅森魡賤 提交于 2019-12-04 09:12:54
问题 I draw lots of quadratic Bézier curves in my OpenGL program. Right now, the curves are one-pixel thin and software-generated, because I'm at a rather early stage, and it is enough to see what works. Simply enough, given 3 control points ( P 0 to P 2 ), I evaluate the following equation with t varying from 0 to 1 (with steps of 1/8) in software and use GL_LINE_STRIP to link them together: B( t ) = (1 - t ) 2 P 0 + 2(1 - t ) t P 1 + t 2 P 2 Where B , obviously enough, results in a 2-dimensional

Calculate middle point of Bezier Curve

守給你的承諾、 提交于 2019-12-04 06:14:26
I have a function to draw Bezier Curve through three points. I have already 2 points (start and end) - A and B. How do I calculate middle point between those two points as middle point would be always a little higher or lower than linear function of those two points. Example : Any formulas, ideas would be great! B.K. I think this is what you're looking for: http://blog.sklambert.com/finding-the-control-points-of-a-bezier-curve/ It goes into detail on calculating the various points on a Bezier curve. You may also be interested in this more specific example for your application: http://www

Create random shape/contour using matplotlib

吃可爱长大的小学妹 提交于 2019-12-04 04:53:13
I am trying to generate an image of a random contour using python but I couldn't find an easy way to do it. Here is an example sort of what I want: Initially I tought of doing it using matplotlib and gaussian functions, but I could not even get close to the image I showed. Is there a simple way to do it? I appreciate any help matplotlib Path A simple way to achieve random and quite smoothed shapes is using matplotlib.path module. Using a cubic Bézier curve, most of the lines will be smoothed, and the number of sharp edges will be one of the parameters to tune. The steps would be the following.

Draw SVG Bezier curve

China☆狼群 提交于 2019-12-04 03:01:50
问题 I have an array of control points that represent a high-order Bezier curve. How can I draw this curve using a single SVG-path? UPD: For example, I have a set of points: (x1, y1) (x2, y2) (x3, y3) (x4, y4) (x5, y5). How SVG-path will look like in the terms of C , S , Q or T ? UPD 2: SOLUTION I asked this question to depict a object path animated with TweenMax. Later I received reply on GreenSock forum. Here's CodePen example. 回答1: Short answer: you can't. SVG only has built in Quadratic (2nd

NV_path_rendering alternative [closed]

大憨熊 提交于 2019-12-04 02:51:51
Closed. This question is off-topic. It is not currently accepting answers. Learn more . Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . I just watched a very impressive presentation from Siggraph 2012: http://nvidia.fullviewmedia.com/siggraph2012/ondemand/SS106.html My question is, this being a proprietary Nvidia extension, what are the other possibilities to quickly renderer Bezier paths on GPU? Alternatively, is there any hope this will end-up as part of OpenGL standard? Is it possible to give any time estimate on when this

How to animate an image along a path with Bezier curves

杀马特。学长 韩版系。学妹 提交于 2019-12-04 02:33:19
My goal: Move/animate an image along a path like the drawing below (Could be connecting bezier curves). Must work in IE7+, don't what to build multiple solutions. I can pause/resume the moving image. The image will keep moving along the path (repeat). What I have considered CANVAS: not supported in IE7+8, haven't tested explorercanvas yet! Foresee some z-index issues. SVG, not supported in IE7+8. jQuery.path, a plugin that extends the jQuery animate function. Can't figure out the resume part and I want to use CSS transforms when supported. My plan Animate the image with CSS 3D transform, CSS