bezier

I've been looking for, but obviously not finding, an algorithm that will allow me to plug in a list of x,y coordinates that are known to be along a curve so as to get the 4 control points for a cubic bezier curve spit out. To be more precise, I'm looking for an algorithm that will give me the two control points required to shape the curve while inputting a series of discrete points including the two control points which determine the start and end of the curve. Thanks! Edit: Okay, due to math, an old foe, I need to ask for the bezier curve of best fit to a polynomial function. tfinniga So I

I am developing one application same as HairTryOn all things are done. but problem is display in following image. i want to set hair style as per customer face using blue line as per display in image. i used the following code testVw = [[UIView alloc]initWithFrame:CGRectMake(100,100, 100, 100)]; testVw.backgroundColor = [UIColor clearColor]; [self.view addSubview:testVw]; resizeVw = [[UIImageView alloc]initWithFrame:CGRectMake(testVw.frame.size.width-25, testVw.frame.size.height-25, 25, 25)]; resizeVw.backgroundColor = [UIColor clearColor]; resizeVw.userInteractionEnabled = YES; resizeVw.image

PHP imagick API中文简介 imagick 类imagick ::adaptiveblurimage 向图像中添加 adaptive 模糊滤镜imagick ::adaptiveresizeimage 自适应调整图像数据依赖关系imagick ::adaptivesharpenimage自适应锐化图像imagick ::adaptivethresholdimage 基于范围的选择为每个像素的亮度imagick ::addimage 图像列表中添加新图像 imagick 对象.imagick ::addnoiseimage 给图像添加随机噪声imagick ::affinetransformimage变换图像imagick ::animateimages 动画图像或图像imagick ::annotateimage annotates 图像的文本imagick ::appendimages 追加一组图像imagick ::averageimages 平均一组图像imagick ::blackthresholdimage 强制所有的像素低于阈值分为黑色imagick ::blurimage 向图像中添加模糊滤镜imagick ::borderimage 四周带有边框的图像imagick ::charcoalimage模拟一个炭笔绘图imagick ::chopimage

While writing a model editor, besides enabling raytracing I can think about couple of operations where I'd like to find an very good approximation about the intersection point between a ray and a triangular bezier patch. How to do this? I know couple of ways but likely there's better ones. Exact use-cases: I might want to use one bezier triangle patch as a reference surface for drawing detailed shapes with mouse. I might too want to pinpoint a splitting-point from such patch. If there's C source code for it, I might like to see that too. Perhaps even use it instead of rolling my own code. I'd

Is it possible to draw a Rect with rounded corners using a DrawNode object? I think that something is possible using Bezier curves, but I have made some tries and I think I can't handle it. Looking at API I've found only these 2 functions: drawQuadBezier (const Vec2 &origin, const Vec2 &control, const Vec2 &destination, unsigned int segments, const Color4F &color) drawCubicBezier (const Vec2 &origin, const Vec2 &control1, const Vec2 &control2, const Vec2 &destination, unsigned int segments, const Color4F &color) [Modified after answer] I have applied the answer in Cocos2dx , maybe somebody

I'm calculating the arclength (length of a cubic bezier curve) with this algorithm function getArcLength(path) { var STEPS = 1000; // > precision var t = 1 / STEPS; var aX=0; var aY=0; var bX=0, bY=0; var dX=0, dY=0; var dS = 0; var sumArc = 0; var j = 0; for (var i=0; i<STEPS; j = j + t) { aX = bezierPoint(j, path[0], path[2], path[4], path[6]); aY = bezierPoint(j, path[1], path[3], path[5], path[7]); dX = aX - bX; dY = aY - bY; // deltaS. Pitagora dS = Math.sqrt((dX * dX) + (dY * dY)); sumArc = sumArc + dS; bX = aX; bY = aY; i++; } return sumArc; } But what I get is something like 915. But

I'm looking for a way to generate a polygon programatically by "thickening" a Bezier curve. Something like this: My initial idea was to find the normals in the line, and generate the polygon from them: But the problem is that the normals can cross each other in steep curves, like this: Are there any formulas or algorithms that generate a polygon from a bezier curve? I couldn't find any information on the internet, but perhaps I'm searching using the wrong words... Yves Daoust If you want a constant thickness, this is called an offset curve and your idea of using normals is correct. This indeed