graphics

问题 I am analyzing the interaction of graphics primitives (rect, line, circle, etc.) and computing the overlap, relative orientation, merging, etc. This is quoted as a prime example of Double Dispatch (e.g. Wikipedia) Adaptive collision algorithms usually require that collisions between different objects be handled in different ways. A typical example is in a game environment where the collision between a spaceship and an asteroid is computed differently than the collision between a spaceship and

问题 I'm new at using actionListener and mouselistner . I want to track the Mouse movements and connect the dots as I go. So it will be one continuous line. I am using the MouseMotionListener every time I move the mouse across the screen and get a new set of points. I am not using mousePressed or mouseReleased . Everytime I move the mouse, I can get every point of where my mouse's position is on my JPanel to show up on my results window, but in order to draw the line between two points, I'm not

问题 I try to do a basic igraph plotting in an IPython notebook: fn = 'misrables.gml' gr = igraph.Graph.Read_GML(fn) igraph.plot(gr) instead of seeing a graph I see this: Out[7]: <igraph.drawing.Plot at 0x1120d6978> How do I persuade IPython to actually show the graphics? Some clarifications Inline matplotlib works fine, so this is not the issue. I have cairo installed: import cairo cairo.version output: 1.10.0 Calling _repr_svg() on the plot object results in an error: TypeError Traceback (most

问题 I'm just working on C # and WPF. I'm developing an application that should handle data transfers on the LAN. In particular, for each transfer progress bars are displayed, green if it is a download, red if it is an upload. Initially I had made some fictitious attempts in which I simulated transfers (the threads of the network were deactivated). So the bars were filled programmatically and I checked the performance of the GUI, everything was fine. In particular I could select the bars and make

问题 It is used to compare the results in many papers and cited as "Akeley, K., P. Haeberli, and D. Burns, tomesh.c, a C-program on the SGI Developer's Toolbox CD, 1990". But where can I find the source code now? Thanks, 回答1: You can download an ISO's of the CD's from http://freeware.sgi.com/faq.html#Q3.3 来源： https://stackoverflow.com/questions/3464159/where-can-i-find-tomesh-c

问题 I want to convert an .avi with alpha channel into a .gif. Firstly, I use ffmpeg -i source.avi -vf scale=720:-1:flags=lanczos,fps=10 frames/ffout%03d.png to convert .avi to sequence of .png's with aplha channel. Then, I use gm convert -loop 0 frames/ffout*.png output.gif to collect a .gif. But it seems that pixels of the output.gif just get stuck when something opaque is rendered on top of the transparent areas. Here's an example: As you can see the hearts and explosions do not get derendered.

问题 The possible values of PixelOffsetMode are: Invalid Default HighSpeed HighQuality None Half I'm guessing that HighQuality = Half, HighSpeed = None and Default = HighSpeed. If this is true then, like the SmoothingMode , I can offer just two simple options. Does anyone know if this is correct and, if so, where on earth did you find the information? 回答1: If this is true then, like the SmoothingMode, I can offer just two simple options. Your assumption seems to be correct. According to this

问题 I am having difficulties rotating an imageicon by using the arrow keys. I currently have the following as my code import java.awt.event.*; import javax.swing.*; import java.awt.*; public class startGame extends JPanel implements ActionListener,KeyListener { Timer time = new Timer(5,this); int x=0,y=0,velX = 0,velY=0; Image car1; public static void main(String[] args) { startGame game = new startGame(); JFrame frame = new JFrame(); frame.setTitle("NEED FOR SPEED"); frame.setSize(800,800);

问题 I have a conundrum... I created a function that will plot 11 plots arranged as 4x3 (i.e., mfrow=c(4,3) ) plots per device window. However, I want the function to do this multiple times with different inputs, thus generating multiple pages of 11 graphs each. The issue is that since I have one "empty" slot per page (12 - 11 = 1), I have to tell the code to start each iteration of plotting on a new window. I've done so by explicitly adding the windows() function directly into the function. This

问题 If I ignore the sordid details of quaternions algebra I think I understand the maths behind rotation and translation transformations. But still fail to understand what I am doing wrong. Why is my camera rolling once and for all!? :) And to be a bit more specific, how should I compute the camera View matrix from its orientation (rotation matrix)? I am writing a minimalistic 3d engine in Python with a scene Node class that handles the mechanics of rotation and translation of 3d objects. It has