2014/10/15 下午 10:04:34
iphone Programming Glossary: bezierhow can i trace the finger movement on touch for drawing smooth curves? http://stackoverflow.com/questions/1052119/how-can-i-trace-the-finger-movement-on-touch-for-drawing-smooth-curves have some kind of example please tell me thanks Edit Moved from answer below thanks to all....... but i had tried the bezier curve algo with two control points but problem is first how to calculate the control points whether there is no predefined..
http://stackoverflow.com/questions/2956967/drawing-path-by-bezier-curves angle Can you tell me how to connect my points more smooth Thanks iphone graphics core graphics quartz graphics bezier share improve this question Here is few references which can help you Draw a Smooth Curve through a Set of 2D Points..
Drawing bezier curves with my finger in iOS? http://stackoverflow.com/questions/4672646/drawing-bezier-curves-with-my-finger-in-ios bezier curves with my finger in iOS Hey I'm trying to figure out how to generate bezier curves in iOS based on user input. Are.. bezier curves with my finger in iOS Hey I'm trying to figure out how to generate bezier curves in iOS based on user input. Are there any existing classes for this Can someone give me a general summary of what.. general summary of what would be required I just need help getting started on the right foot. iphone ipad ios vector bezier share improve this question If you want to stay in objective c you can use UIBezierPath's addCurveToPoint controlPoint1..
Just two rounded corners? [duplicate] http://stackoverflow.com/questions/4845211/just-two-rounded-corners different power of two in the bitmask. Much Later Edit I've discovered an easier way to do this using UIBezierPath 's bezierPathWithRoundedRect byRoundingCorners cornerRadii . Just use the bezier path object's CGPath in your context. share improve..
How do I detect a touch on a UIBezierPath and move a ball along that? http://stackoverflow.com/questions/4854035/how-do-i-detect-a-touch-on-a-uibezierpath-and-move-a-ball-along-that BOOL inFill How do I detect a touch along a path This is what I've tried so far UIBezierPath aShape UIBezierPath bezierPathWithOvalInRect CGRectMake 0 0 200 100 UIColor blackColor setStroke UIColor redColor setFill CGContextRef aRef UIGraphicsGetCurrentContext.. After that assuming we are talking about cubics you need to find points and likely velocities a.k.a. tangents along a bezier. Here is the exact total code to do that Find the tangent of a point on a cubic bezier curve on an iPhone . . I pasted it.. a.k.a. tangents along a bezier. Here is the exact total code to do that Find the tangent of a point on a cubic bezier curve on an iPhone . . I pasted it in below too. You will have to implement your own MCsim or iteration to find where it..
How to create custom easing function with Core Animation? http://stackoverflow.com/questions/5161465/how-to-create-custom-easing-function-with-core-animation EaseOut etc . For instance a bounce or elastic function. These things are possible to do with MediaTimingFunction bezier But I'd like to create timing functions that are more complex. Problem is that media timing seems to require a cubic bezier.. But I'd like to create timing functions that are more complex. Problem is that media timing seems to require a cubic bezier which is not powerful enough to create these effects The code to create the above is simple enough in other frameworks which.. line from a to b but will accelerate and decelerate in a more complex way than what is possible using the current bezier based CAMediaTimingFunction. Lets make that line any arbitrary curve movement specified with CGPath. It should still move..
Why is UIBezierPath faster than Core Graphics path? http://stackoverflow.com/questions/6327817/why-is-uibezierpath-faster-than-core-graphics-path it creates or I'm creating the CGPath in a na簿ve way. What can I do to speed up my CGPath drawing iphone ios drawing bezier share improve this question You are correct in that UIBezierPath is simply an objective c wrapper for Core Graphics..
How to compare a shape drawn on the screen to a letter? http://stackoverflow.com/questions/7990774/how-to-compare-a-shape-drawn-on-the-screen-to-a-letter this question I don't have any sample code for you but this is how I'd do this I think. You need to define or get a bezier path describing the shape of each letter this would be an outline of a solid letter not just a line drawing the letter shape... of a solid letter not just a line drawing the letter shape. There may be a way to get this from the api obtaining a bezier path from a glyph or you may have to design them yourself. You then need to scale the bezier path so it is roughly the same.. from the api obtaining a bezier path from a glyph or you may have to design them yourself. You then need to scale the bezier path so it is roughly the same size as the drawing on the screen. Then check how many of the points in the drawn path fall..
Drawing Smooth Curves - Methods Needed http://stackoverflow.com/questions/8702696/drawing-smooth-curves-methods-needed granularity NSMutableArray points NSMutableArray self pointsOrdered mutableCopy if points.count 4 return self bezierPath Add control points to make the math make sense points insertObject points objectAtIndex 0 atIndex 0 points addObject.. points insertObject points objectAtIndex 0 atIndex 0 points addObject points lastObject UIBezierPath smoothedPath self bezierPath smoothedPath removeAllPoints smoothedPath moveToPoint POINT 0 for NSUInteger index 1 index points.count 2 index CGPoint.. count self mutableSetValueForKey @ points addObject newPoint NSMutableArray self pointsOrdered addObject newPoint self bezierPath addLineToPoint CGPoint return newPoint autorelease if self bezierPath pointsOrdered count 3 PVPoint control1 pointsOrdered..
how can i trace the finger movement on touch for drawing smooth curves? http://stackoverflow.com/questions/1052119/how-can-i-trace-the-finger-movement-on-touch-for-drawing-smooth-curves Rom spline. This is easier than it sounds since you can easily convert a Catmull Rom spline into a series of cubic Bezier curves. Here's how. Say you have four consecutive sample points P0 P1 P2 and P3 the cubic Bezier curve that connects P1.. a series of cubic Bezier curves. Here's how. Say you have four consecutive sample points P0 P1 P2 and P3 the cubic Bezier curve that connects P1 to P2 is defined by the following control points B0 P1 B1 P1 P2 P0 6 B3 P2 P1 P3 6 B4 P2 This should.. the squared distance between the samples and your curve. The NURBS curve can even be decomposed into a series of Bezier curves if needed. If you decide to explore this approach then the book Curves and Surfaces for CAGD by Gerald Farin or a..
BezierPath Rotation in a UIView http://stackoverflow.com/questions/10533793/bezierpath-rotation-in-a-uiview Rotation in a UIView I am drawing a BezierPath on Touch event. Now I have to rotate that Bezier Path on the same location.. Rotation in a UIView I am drawing a BezierPath on Touch event. Now I have to rotate that Bezier Path on the same location using Gesture Method. But problem is after.. Rotation in a UIView I am drawing a BezierPath on Touch event. Now I have to rotate that Bezier Path on the same location using Gesture Method. But problem is after rotation its position become change. Its look like..
How can I animate the movement of a view or image along a curved path? http://stackoverflow.com/questions/1142727/how-can-i-animate-the-movement-of-a-view-or-image-along-a-curved-path Nikolai said the best way to handle this is to use Core Animation to animate the motion of the image or view along a Bezier path. This is accomplished using a CAKeyframeAnimation. For example I've used the following code to animate an image of..
iphone UIbezierpath irregular image cropping http://stackoverflow.com/questions/12670051/iphone-uibezierpath-irregular-image-cropping It will take a lot of trial and error I did this quickly just to give you an idea of how to to create shapes using Bezier Paths. Below is example code to create a square shape that I quickly created UIBezierPath aPath UIBezierPath bezierPath.. of how to to create shapes using Bezier Paths. Below is example code to create a square shape that I quickly created UIBezierPath aPath UIBezierPath bezierPath Set the starting point of the shape. aPath moveToPoint CGPointMake 50.0 50.0 Draw the.. shapes using Bezier Paths. Below is example code to create a square shape that I quickly created UIBezierPath aPath UIBezierPath bezierPath Set the starting point of the shape. aPath moveToPoint CGPointMake 50.0 50.0 Draw the lines. aPath addLineToPoint..
Drag UIView around Shape Comprised of CGMutablePaths http://stackoverflow.com/questions/13664615/drag-uiview-around-shape-comprised-of-cgmutablepaths 8. It'll look like this when we're done So how do we do this Given an arbitrary point finding the nearest point on a Bezier spline is rather complicated. Let's do it by brute force. We'll just make an array of points closely spaced along the path... either is nearer we'll move the object to that neighbor point. Even getting an array of closely spaced points along a Bezier curve is not trivial but there is a way to get Core Graphics to do it for us. We can use CGPathCreateCopyByDashingPath with.. which takes a callback. It would be much nicer to iterate over path elements with a block so let's add a category to UIBezierPath . We start by creating a new project using the �Single View Application template with ARC enabled. We add a category..
Adjusting the line to fit our head in imageview http://stackoverflow.com/questions/15402377/adjusting-the-line-to-fit-our-head-in-imageview need to partition your point set according to touch zones and scale then as needed. If you convert your lines into Bezier curves then manipulating the curve will be easier as you will not need to do terrible amount of adjustment to the shape..
http://stackoverflow.com/questions/2956967/drawing-path-by-bezier-curves path by Bezier curves I have a task draw smooth curve input set of points they added in realtime current solution I use each 4 points.. a task draw smooth curve input set of points they added in realtime current solution I use each 4 points to draw qubic Bezier curve 1 strart 2 and 3rd control points 4 end . End point of each curve is start point for the next one. problem at the..
Find the tangent of a point on a cubic bezier curve (on an iPhone) http://stackoverflow.com/questions/4089443/find-the-tangent-of-a-point-on-a-cubic-bezier-curve-on-an-iphone version of Michal's answer which is more explanatory . To repeat bezierInterpolation finds the points. The routine altBezierInterpolation finds exactly the same points using the same math. But it is written in a simpler way which is easier to understand... But it is written in a simpler way which is easier to understand. You can use either routine bezierInterpolation or altBezierInterpolation for identical results. In both cases use bezierTangent to find the tangents. Finally at the bottom is a code.. only the two routines you need for the calculation and nothing else. Hope this helps someone in the future. MBBezierView.m original BY MICHAL stackoverflow #4058979 #import MBBezierView.h CGFloat bezierInterpolation CGFloat t CGFloat a CGFloat..
iPhone smooth sketch drawing algorithm http://stackoverflow.com/questions/5076622/iphone-smooth-sketch-drawing-algorithm iphone drawing quartz graphics share improve this question The easiest way to smooth a curve like this is to use a Bezier curve instead of straight line segments. For the math behind this see this article pointed to in this answer which describes..
Rotate a Sprite on a bezier path with touch - Cocos2D/Box2D http://stackoverflow.com/questions/7494795/rotate-a-sprite-on-a-bezier-path-with-touch-cocos2d-box2d arc centered at the origin This algorithm is based on the approach described in A. Ri禳kus Approximation of a Cubic Bezier Curve by Circular Arcs and Vice Versa Information Technology and Control 35 4 2006 pp. 371 378. @note adapted for xCode.. cos_ar ctrlPoint2.y NSNumber numberWithFloat r cosf a2 endPoint.x NSNumber numberWithFloat r sinf a2 endPoint.y nil Bezier approximation example @note adapted for xCode by Valentine Konov valentine @konov.su 2013 @param inSprite_ is sprite angle_.. valentine @konov.su 2013 @param inSprite_ is sprite angle_ signed angle radiants @return CCSequence of CCSpawns of CCBezierTo and CCRotateBy id calcBezierCircle CCSprite inSprite_ withAngle float angle_ double speed 100 points per second CGPoint..
Drawing Smooth Curves - Methods Needed http://stackoverflow.com/questions/8702696/drawing-smooth-curves-methods-needed Like everyone before has asked how do you smooth a set of points in an iOS drawing app WHILE MOVING I have tried UIBezierpaths but all I get are jagged ends where they intersect when I just shift the points 1 2 3 4 2 3 4 5. I have heard of spline.. This was my code for the UIBezierPath which left edges at intersection UPDATED TO AN ANSWER BELOW #define VALUE _INDEX_ NSValue valueWithCGPoint points _INDEX_.. NSValue valueWithCGPoint points _INDEX_ #define POINT _INDEX_ NSValue points objectAtIndex _INDEX_ CGPointValue UIBezierPath smoothedPathWithGranularity NSInteger granularity NSMutableArray points NSMutableArray self pointsOrdered mutableCopy..
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