2d

问题 How can I turn this: students = [("Abe", 200), ("Lindsay", 180), ("Rachel" , 215)] into this: Abe 200 Lindsay 180 Rachel 215 EDIT: This should be able to work for any size list. 回答1: Use string formatting: >>> students = [("Abe", 200), ("Lindsay", 180), ("Rachel" , 215)] >>> for a, b in students: ... print '{:<7s} {}'.format(a, b) ... Abe 200 Lindsay 180 Rachel 215 回答2: Use rjust and ljust: for s in students: print s[0].ljust(8)+(str(s[1])).ljust(3) Output: Abe 200 Lindsay 180 Rachel 215 回答3:

问题 I want to trace the path where a bullet will move in my SpriteKit GameScene. I'm using "enumerateBodies(alongRayStart", I can easily calculate the first collision with a physics body. I don't know how to calculate the angle of reflection, given the contact point and the contact normal. I want to calculate the path, over 5 reflections/bounces, so first I: Cast a ray, get all the bodies it intersects with, and get the closest one. I then use that contact point as the start of my next reflection

问题 I'd like to resize a circle on my canvas with the help of a slider. This circle can be moved around on the canvas by some drag&drop stuff I did in code behind, so its position is not fixed. I have bound the slider's value to an ellipse's height and width. Unfortunately, when I use the slider, the circle gets resized with its top left point (actually the top left point of the rectangle it's sitting in) staying the same during the operation. I would like to resize it with its center point being

问题 I have a random 2D image. I would like to be able to present the image in 3D. This doesn't have to be very detailed, even if the image were arbitrarily broken into layers like a pop-up cutout from a children's book. The goal would be that a given image would look normal when directly viewed but that if a viewer were to move/tilt left, right, up, down there would be a 3d effect. This is similar but not exactly the same as this question here: How to create 3D streoscopic images using MATLAB

问题 I have an implicit scalar field defined in 2D, for every point in 2D I can make it compute an exact scalar value but its a somewhat complex computation. I would like to draw an iso-line of that surface, say the line of the '0' value. The function itself is continuous but the '0' iso-line can have multiple continuous instances and it is not guaranteed that all of them are connected. Calculating the value for each pixel is not an option because that would take too much time - in the order of a

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 7 years ago . I am trying to write 2 functions, one to read the matrix (2D array) and other one to print it out. So far I have: /* Read a matrix: allocate space, read elements, return pointer. The number of rows and columns are given by the two arguments. */ double **read_matrix(int rows, int cols){ double **mat = (double **)

问题 I'm trying to draw a basic 2d ground mesh made up of smaller tiles from a texture atlas (note the 1 pixel transparent border): I render the tiles as texture quads using the following code: glEnable(GL_TEXTURE_2D); glBindTexture(GL_TEXTURE_2D, m_texture); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glEnableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glVertexPointer(2, GL_SHORT

问题 I have written a 2D Jump&Run Engine resulting in a 320x224 (320x240) image. To maintain the old school "pixely"-feel to it, I would like to scale the resulting image by 2 or 3 or 4, according to the resolution of the user. I don't want to scale each and every sprite, but the resulting image! Thanks in advance :) 回答1: Bob's answer is correct about changing the filtering mode to TextureFilter.Point to keep things nice and pixelated. But possibly a better method than scaling each sprite (as you

问题 I'm an dev still learning in Android, I've created two apps so far, an alarm clock, a widget and a pass manager using databases, I have a little bit of experience, but I'd like to create a 2D side scroller game, I check on the web and there are different tutorials, but, what's the best way to start working on it? I've read about libgdx but I'm not sure if it's outdated. I've seen that all the games are made in Java, and then ported to Android, is this correct? I would appreciate some guidance

问题 Let's say that I have the coordinates of a line (25,35 45,65, 30,85 - It would be a two part line). I need to move a point (car) along that line at a constant distance every frame. How can I do this? 回答1: Consider the line (25,35 45,65). The vector from the beginning to the end is (20, 30). To move a point (x,y) in that direction, we could just add that vector: V = (20, 30) (x,y) => (x+20, y+30). If we start at the beginning of the line, we'll arrive at the end. But that's too big a step. We