rotation

问题 I am doing an app which has a feature to rotate and re size a view. i have implemented this feature but i do face an issue. My problem The View wil be resized when dragging its four corners, after resizing it i can rotate the view in both directions. Once the rotation is done, if i try again to resize the view by dragging its corner, the view's size gone to unpredictable value and its moving all around the screen. I googled lot finally i got the following solution The frame property is

问题 I've got an image (a straight line) and am trying to rotate it in some angle from a specific point. What happens is that the image is rotated from the center point of itself. I wan't a way through which the base of the image remains the same and it rotates in the angle I want to, just as in case of a clock. I use Compass2.layer.anchorPoint= CGPointMake(0.5,1); [Compass2 setTransform:CGAffineTransformMakeRotation(XXXX)]; However it shows Accessing unknown 'achorPoint' component of a property.

问题 I am trying to have text rotate onto a plot which is shown on log scale. When I compute the angles (based on the solution in this answer) the angles are getting incorrectly rounded to 0 or 90 degrees . This is because the angles are computed on a linear scale first, and then transformed. This calculation in linear space is the cause of the trouble. Even in a situation where I know the gradient, (either in a linear or logarithmic scale), I am not sure how I can put this onto the graph

问题 I'm making a skin previewer for my site; I need to rotate parts of an image to create a representation of this for my users to see. The skin is a PNG file, and all parts of it may have transparency or even none at all. I need to be able to rotate this image while keeping any transparency inside the image transparent, while also having the extended borders (You know, the area that wasn't part of the image before it was rotated) transparent. All of my attempts have left a black border around

问题 So I nearly implemented a free-flight camera using vectors and something like gluLookAt. The movement in all 4 directions and rotation around the Y-axis work fine. For the rotation around the Y-axis I calculate the vector between the eye and center vector and then rotate it with the rotation matrix like this: Vector temp = vecmath.vector(center.x() - eye.x(), center.y() - eye.y(), center.z() - eye.z()); float vecX = (temp.x()*(float) Math.cos(-turnSpeed)) + (temp.z()* (float)Math.sin(

问题 i would like create the project, reading from Excel and write on pdf and print this pdf. From Excel file (from cell) read directory where is original pdf on computer or server, and next cell have info what write on the top in second pdf. And problem is here, original pdf is horizontal, landscape, rotate and my program create copy from original pdf and write info from excel on the top on copy pdf file. But pdf which is landscape is rotate for 270 deegres. This is no OK. For portrait rotation

问题 double degPi = degrees * Math.PI / 180; double a = Math.cos(degPi)*tImgCover.getScaledHeight(); double b = Math.sin(degPi)*tImgCover.getScaledWidth(); double c = -Math.sin(degPi) * tImgCover.getScaledHeight(); double d = Math.cos(degPi)* tImgCover.getScaledWidth(); double e = absX; double f = absY; contentByte.addImage(imgae, a, b, c, d, e, f);/*add image*/ How to rotate around the image center by itext? 回答1: If we have an Image image and coordinates x, y , we can draw the image without

问题 I'm trying to make the img with the id image rotate using the onclick event handler to use the code in my function which grabs the image by ID assigns a variable name, then uses the variable name to rotate. I'm not really sure where i when wrong in my code. <section id="middle"> <img id="image" src="images/flower.png" > <button onclick="myFunction()">Click me</button> </section> MyFunction(){ var img = document.getElementById("image"); img.rotate(20*Math.PI/180); } 回答1: You can do the

问题 This code is taken from http://wilq32.googlepages.com/wilq32.rollimage222, and is supposed to animate an image rotation. I can't figure out the structure exactly, and how to train it to do what I want, for example - make div X rotate div Y on hover (instead of rotating itself), or adding other functions such as fade to the animation. $(document).ready(function() { var rot=$('#image3').rotate({maxAngle:25,minAngle:-55, bind: [ {"mouseover":function(){rot[0].rotateAnimation(85);}}, {"mouseout"

问题 For a project, I have a matrix<float> which is rotated few degrees. I have no control over this process (assume it is using nearest neighbour), I want to reverse this rotation operation and obtain the initial matrix (or a matrix very close to it). My initial assumption was if I rotate the rotated matrix with -angle and crop the middle part, I'd have the original matrix but the results indicate the quality drops dramatically. Consider my original matrix (the first image in the figure ) is