bezier

问题 I'm familiar with UIBezierPath and the corresponding CG routines, but none of them appear to draw the same type of path as what I see in Photoshop, etc. How would one go about this? I'm just talking about the UI--letting the user drag around points. A java example I found is here: http://www.cse.unsw.edu.au/~lambert/splines/natcubic.html 回答1: I would look into CGContextAddCurveToPoint and drag around curve's control points. If you require more control points to create a complex curve, just

问题 Basically, I want to randomly add a movie clip to any point along a bezier curve. Is there a way to find all points along a path? Or maybe there's a way to find the equation (it's a quadratic curve)? If all else fails, is there a way to find the points along a straight line (that isn't perfectly horizontal or vertical)? 回答1: If you are using the pen tool, this is creating a Shape . You can access the path of this shape by reading the result from Shape.graphics.readGraphicsData() See the

问题 Basically, I want to randomly add a movie clip to any point along a bezier curve. Is there a way to find all points along a path? Or maybe there's a way to find the equation (it's a quadratic curve)? If all else fails, is there a way to find the points along a straight line (that isn't perfectly horizontal or vertical)? 回答1: If you are using the pen tool, this is creating a Shape . You can access the path of this shape by reading the result from Shape.graphics.readGraphicsData() See the

问题 I need to find the 2 points of the visual horizon , of a curved face. I have: XYZ of the 4 corner points XYZ of the 2 curved edge bezier points And I need to calculate either: XY of the horizon points XYZ of the horizon points 回答1: First off you have to convert your 3D beziers to 2D. If I remember right it's sufficient to project the curves just like you project 3D points for rendering. Afterwards you have to find the extrema of the curves. A small HowTo: Convert your bezier-curve from bezier

问题 Can someone smarter than me take a look at this. I'm trying to implement a Bezier curve algorithm I found here in objective-c. The output is way wrong. I think I converted the code correctly so either the original was wrong or was not ment to be used like this... If I use the built in NSBezierPath the curve looks great but I can't use the built in NSBezierPath . NSBezierPath example NSBezierPath *bezierPath = [[NSBezierPath alloc] init]; [bezierPath setLineWidth:1.0f]; [bezierPath moveToPoint

问题 I am looking for the calculated values of ggplot2 when applying geom_curve . Herefore, a little reproducible example: require(ggplot2) df <- data.frame(x=c(0,2), y=c(5,5)) plot <- ggplot() + geom_curve(data = df, aes(x = df[1,"x"], y = df[1,"y"], xend = df[2,"x"], yend = df[2,"y"]), color = "red", linetype = 3, curvature = 0.4, size = 2) plot This plots a red curve between the two points of my data.frame. I am interested in the calculated values for plotting the arc, done by geom_curve . How

问题 What's the best way to draw cubic bezier curves programmatically in AS3? The Graphics class only seems to support quadratic curves. :( I want to be able to do something like: var startPoint:Point = new Point(0, 0); var endPoint:Point = new Point(5, 5); var control1:Point = new Point(5, 0); var control2:Point = new Point(0, 5); var myBezier:Sprite = getBezier(startPoint, control1, control2, endPoint); For a performance target, I'm planning on having ~50 of these on the stage at once. 回答1: Note

问题 I need to make a cube with smooth corners and smooth edges in C++ with OpenGL. For all I know I have three options: Bezier curves (maybe, is it possible?), a cube with cylinders for edges and spheres for corners or load a .3ds of a cube. Any ideas? 回答1: You can simulate a cube with smooth lighting by pointing the normals directly out from the center (simulating an 8 cornered sphere). It totally depends on what exactly you are trying to do. Using the above method may be perfectly good enough.

问题 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)];

问题 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,