rotation

问题 How to rotate a div to certain height suppose 10px. I can rotate a div otherwise around 360 degrees. I need the angle by which the div would touch the line. 回答1: You can apply the coordinate formula of the circle: (x - a)² + (y - b)² = r² . Because we've interest in the angle only, we can position the circle on the origin, and ignore a and b , which makes the calculation much more simple. In the image, the green items are known, the cyan items are helpers, and the red items are the changes

问题 I'm doing a bunch of voluntaty tasks for Java, which cover working with basic arrays and methods. I've been doing quite well, until I hit a severe roadblock. The initial task was to create a method rotateByN , which should take an int array and rotate it by N steps (and affect the input array, not return a new one). Simple enough: public class Four { static void rotateByN(int[] in, int n) { for (int l = 1; l <= n; l++) { int tmp = in[0]; for (int i = 1; i < in.length; i++) { in[i - 1] = in[i]

问题 I'm doing a bunch of voluntaty tasks for Java, which cover working with basic arrays and methods. I've been doing quite well, until I hit a severe roadblock. The initial task was to create a method rotateByN , which should take an int array and rotate it by N steps (and affect the input array, not return a new one). Simple enough: public class Four { static void rotateByN(int[] in, int n) { for (int l = 1; l <= n; l++) { int tmp = in[0]; for (int i = 1; i < in.length; i++) { in[i - 1] = in[i]

问题 I'm trying to go over the problems in the Cracking the Coding Interview book. One of the questions asks me to rotate a matrix 90 degrees clockwise. Now, while trying to solidify my understanding of matrix rotation, I tried to embark on a new problem: to try to rotate a matrix 90 degrees counterclockwise (the other direction). I've tried to go through layers of a square matrix, the outer layer, iterating all the way into the inner layer and rotating all the indexes of each side of the "square"

问题 it is a while ago that I asked this question: javafx - How to apply yaw, pitch and roll deltas (not euler) to a node in respect to the nodes rotation axes instead of the scene rotation axes? Today I want to ask, how I can get the tilt (fore-back and sideways) relative to the body (not to the room) from the rotation matrix. To make the problem understandable, I took the final code from the fantastic answer of José Pereda and basicly added a method "getEulersFromRotationMatrix". This is working

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 12 days ago . Improve this question The car is moving straight. When it hits the window edge it moves backwards then changes direction at an angle of 45 degrees clockwise and keeps moving straight. if it hit the edge of the window again, it would do the same I've made the code below. I was only

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 12 days ago . Improve this question The car is moving straight. When it hits the window edge it moves backwards then changes direction at an angle of 45 degrees clockwise and keeps moving straight. if it hit the edge of the window again, it would do the same I've made the code below. I was only

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 12 days ago . Improve this question The car is moving straight. When it hits the window edge it moves backwards then changes direction at an angle of 45 degrees clockwise and keeps moving straight. if it hit the edge of the window again, it would do the same I've made the code below. I was only

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 12 days ago . Improve this question The car is moving straight. When it hits the window edge it moves backwards then changes direction at an angle of 45 degrees clockwise and keeps moving straight. if it hit the edge of the window again, it would do the same I've made the code below. I was only

问题 This question already has answers here : Rotate the elements in an array in JavaScript (31 answers) Closed 2 years ago . Hello, everybody, I have this task: I have an array [4,7,3,6,9] and I have to make an array like this: [4,7,3,6,9] [9,4,7,3,6] [6,9,4,7,3] [3,6,9,4,7] [7,3,6,9,4] I have to make a program where array is rotating even if I add a new item to an array it should change accordingly. I am total newbie at JS, 1 week or so, here is my current try: var numbers = [4, 7, 3, 6, 9];