rotation

问题 I would like to rotate a rectangle around its center point and it should remain in the place that it is supposed be drawn and rotate in that space this is my code: AffineTransform transform = new AffineTransform(); transform.rotate(Math.toRadians(45),rectangle.width/2, rectangle.height/2); Shape transformed = transform.createTransformedShape(rectangle); g2.fill(transformed) the rectangle is rotated but it is drawn at a different part of the screen, how can I correct this? 回答1: I haven't tried

问题 I'm using storyboard and autolayout , and setting the constraints in IB as IBOutlet in the corresponding view controller. I'm reading several posts regarding how to update the constraints to be different in portrait and in landscape but I'm still not sure of how should I do this: Should I set the new constraints in -viewWillTransitionToSize:withTransitionCoordinator: method, or in updateViewConstraints method? When the new constraints are set, should I call [self.view

问题 I have two devices, a Nexus 7 (Android 5) and a Galaxy S3 (4.3). On both devices I recorded a video in portrait mode and saved it with rotation hint 90 degrees. This is the correct orientation hint cause when played using the default media player the orientation is fine on both devices. I can even copy the video from the Nexus to the Galaxy and the orientation is still fine when I play the video file. However, when I decode the video using the MediaCodec api I get some problems with the video

问题 I have two vectors describing rotations; a start rotation A and a target rotation B. How would I best go about interpolating A by a factor F to approach B? Using a simple lerp on the vectors fails to work when more than one dimension needs to be interpolated (i.e. produces undesirable rotations). Maybe building quaternions from the rotation vectors and using slerp is the way to go. But how, then, could I extract a vector describing the new rotation from the resulting quaternion? Thanks in

问题 I want to find the "distance" between two quaternions. By "distance" I mean a single float or int, not another quaternion (that would be the difference, i.e. inverse(q1)*q2 ). I guess you could call what I want "angular magnitude". I need to apply more torque to a physics object the further it's rotated from its original angle. I don't understand the maths involved in quaternions, so a code-based example would be most helpful. I've looked at several other questions but I don't believe any

问题 My JavaFX TableView looks something like this: It would be so much more pleasing and efficient if the labels at the top were diagonal to save space. I imagine it like so: The goal is to make the column fit closely to the content despite a long header label. Can it be done? 来源： https://stackoverflow.com/questions/46164114/is-it-possible-to-make-diagonal-column-headers-in-javafx

问题 My JavaFX TableView looks something like this: It would be so much more pleasing and efficient if the labels at the top were diagonal to save space. I imagine it like so: The goal is to make the column fit closely to the content despite a long header label. Can it be done? 来源： https://stackoverflow.com/questions/46164114/is-it-possible-to-make-diagonal-column-headers-in-javafx

问题 I have been uploading images to FirebaseStorage, but often they are the wrong way around when displaying them. I have discovered the ExifInterface that can determined the orientation of the image and rotate and flip it if necessary. When selecting the image from the gallery area on my phone I get this error. I can select the image on my phone from the gallery and It can be displayed on the page. The differences between the URI address and the data is one / Data.getData() address : content:/

问题 I'm having a big problem limiting the camera pitch angle (between -90º and 90º) with the code below. This is somewhat a follow up to this question. The problem, it seems, is that the camera rotates more than -90º or more than +90º and when that happens, I'll be looking down (or up) but but the view just rotated 180º around the Y axis. Example: I'm facing north looking at the horizon and I start to look down until I can't go down anymore (limited by the code below). Then I start to look up and

问题 I would like to rotate a ggplot2 graph by a self-specified angle. I found how to rotate the axis text with element_text(angle = 20) . I would like to do something similar with the whole plot. Reproducible example: set.seed(123) data_plot <- data.frame(x = sort(rnorm(1000)), y = sort(rnorm(1000))) ggplot(data_plot, aes(y, x)) + geom_line() # + theme(axis.title.x = element_text(angle = 20)) This graph should be rotated: 回答1: Here's a rough idea, calling your plot p : library(grid) pushViewport