2d

问题 I need to create a dictionary, with the last and first name of the author as the key, and the quantity on hand, price, and the book's name as the values. [['Shakespeare', 'William', 'Rome And Juliet', '5', '5.99'], ['Shakespeare', 'William', 'Macbeth', '3', '7.99'], ['Dickens', 'Charles', 'Hard Times', '7', '27.00'], ['']] I've compiled this 2-D list, so far and I'm stuck. Any help would be appreciated! 回答1: The following will create a dictionary that maps each author's name to a list of

问题 I need to create a dictionary, with the last and first name of the author as the key, and the quantity on hand, price, and the book's name as the values. [['Shakespeare', 'William', 'Rome And Juliet', '5', '5.99'], ['Shakespeare', 'William', 'Macbeth', '3', '7.99'], ['Dickens', 'Charles', 'Hard Times', '7', '27.00'], ['']] I've compiled this 2-D list, so far and I'm stuck. Any help would be appreciated! 回答1: The following will create a dictionary that maps each author's name to a list of

问题 I have a small panel where i am making a ball to move by just varying it's x co-ordinate . I want the ball move back when it encounters the end of frame.The width of my frame is 300 (by fr.setSize(300,300)) . Now I programmed the animation like : // when x == 300 // stop the timer But x=300 seems to be greater than it's width which is 300 ! How is this possible. **The ball moves out of the 300 x 300 frame and becomes invisible. Why is this happening ? These are the screen shots of what

问题 How do I make my ball bounce off objects on the screen? The picture below is a good example of how the program should be working once the ball runs into an obstacle. I made the ball bounce off the walls, but what's left is making it also bounce off objects. Thanks for the help! Here's the source code: public class 2DGAME extends Application { public static Circle circle; public static Pane canvas; private long counter = 0; double X = 0; double Y = 0; @Override public void start(Stage

问题 I do not really understand the way I'm suppose to render a side-scroller? How do I know what to render when my character move? What kind of positionning should I use for the characters? I hope my question is clear 回答1: The easiest way i've found to do it is have a characterX and characterY variable [integer or float, whatever you want] Then have a cameraX and cameraY variable. Every object in the scene is drawn at theObjectX-cameraX, theObjectY-cameraY... CameraX/CameraY are tweened by a

问题 I have really stuck on two Java related issues. One simple and one more difficult. Regarding the creation of a 2D array, I initialize a table like this: private String [][] table_of_classifiers = null; and then, within a function, I fill its contents like this: String [][] table_of_classifiers = { {"x1","x","x","x","x"}, {"x2","x","x","x","x"}, {"x3","x","x","x","x"}, {"x4","x","x","x","x"}, {"x5","x","x","x","x"}, {"x6","x","x","x","x"}, }; But as you can guess the second table overwrites

问题 I am making a small prototype of a Unity 2D game. I have 2 colliders for my character. This helps me because I want my character to be able to wall jump. This means that when I collide with the wall, my collider detection script assumes that I am hitting 2 colliders, and helps me customize animations. //on the ground, change y position as necessary, and if you are pressing up, held = true if (InAirDetection.AirDetect == 1) { position.y += MoveUnitsPerSecond * verticalInput * Time.deltaTime;

问题 I'm writing an Android app that shows moon phases for any date. Currently I am showing a generalized view from the northern hemisphere (sunlit part of the moon moves from right to left with 0º viewing rotation). However, this motion is reversed when viewing the moon from the southern hemisphere, and near the equator, something else happens entirely. Some of this information can be found on this webpage on moon phases. Instead of using just three simplified cases (northern, southern, and

问题 Say I passed the address of the 2d array to a function along with its row and column of the 2d array. The function will treat the address of the 2d array as 1d array. (eg. int matrix[] ) If i execute below code: int** arr; arr = new int*[row]; for ( int i = 0; i < row; i++ ) { arr[i] = new int[column]; } Hypothetically, I think in a multi-threaded system, this may not allocate contiguous memory for the 2d array. Am I correct? However, I think in a single threaded system, this will allocate

问题 I'm on iOS 5.1 I was trying to display several batch of lines in the same vertex array and I wanted to separate them using degenerated vertices. But it does not seem to work. I line is drawn between each batch of vertices. Googling the problem gave me results that degenerated vertices was not compatible with GL_LINE_STRIP but I'm not really sure about it. Can someone confirm that? And also what's the alternative ? 回答1: As far as I know, you can only draw a continuous line using a single