I know this is a bit late, but I’ve written a fiddle for exactly this problem, on an HTML5 canvas: http://jsfiddle.net/oscarpalacious/ZdQKg/ I hope somebody finds it useful! I’m actually not calculating your x,y for the upper left corner of the container. It’s calculated as a result of the offset (code from the fiddle example): this.w … Read more
I don’t know the Java API very well, this code are developed in c++. The logics should be the same, use transpose + flip to rotate the image with 90n(n belongs to N = -minimum value of int, ….., -3, -2, -1, 0, 1, 2, 3, …, max value of int) /* *@brief rotate image … Read more
Try triggering the CSS 3d Transform mode with webkit. this changes the way chrome renders -webkit-transform: rotate(.7deg) translate3d( 0, 0, 0); edit There also a Webkit only style declaration -webkit-font-smoothing which takes the values none subpixel-antialiased antialiased where subpixel-antialiased is the default value. Alas, the subpixel antialias is no good solution for rotated text. The … Read more
There are various ways to do it, but as given here, using android:configChanges=”keyboardHidden|orientation|screenSize” allows you to listen for the config changes. You then respond to these changes by overriding onConfigurationChanged and calling setContentView. This is the way I’ve been doing it, but I’d be interested to know other people’s thoughts.
It depends on which point you want to use as a “center” for your rotation. Let’s call the point to the up and left pointA and the one to the right and below pointB. If you want to rotate around the point A so that point B aligns with it, calculating the rotation angle in … Read more
The problem is int center = radius which you are setting int radius = 576. This doesn’t make sense as surely you are rotating about a point that should have an x and y location. Given you are rotating around the origin the center x and y should both be 0 not 576. So, given … Read more
The process of rotating a component is more complicated then just painting the rotated image. There are a number of interconnected layers which generate contractual obligations. For example, the size of the clipping rectangle set to the Graphics context that is passed to your component for painting is determined by the current size of the … Read more
As always, the Internet to the rescue. So, this is some code which I hobbled together from other resources/post/blogs which will return a new image which is sized so it will contain the rotated image public BufferedImage rotateImageByDegrees(BufferedImage img, double angle) { double rads = Math.toRadians(angle); double sin = Math.abs(Math.sin(rads)), cos = Math.abs(Math.cos(rads)); int w … Read more
The CSS Transforms spec explains this behavior. Elements with transforms act as a containing block for fixed position descendants, so position:fixed under something with a transform no longer has fixed behavior. They do work when applied to the same element; the element will be positioned as fixed, and then transformed.
I’ve found a solution that doesn’t involve warpAffine(). But before that, I need to state (for future references) that my suspicion was right, you needed to pass the size of the destination when calling warpAffine(): warpAffine(image, rotated_img, rot_matrix, rotated_img.size()); As far as I can tell, the black border (caused by writing at an offset) drawed … Read more