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  • Flip <canvas> (rotate 180deg) after being published on page.

    - by smallmeans
    I'm trying to rotate a canvas element AFTER it's been appended to the DOM. Canvas is 600x50 and this is the code at hand: var canvas = document.getElementsByTagName('canvas')[2]; var ctx = canvas.getContext('2d'); ctx.translate(300, 25); // rotate @ center ctx.rotate(angle * Math.PI/180); which isn't accomplishing the task. Am I missing something? Thanks

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  • Stuttering animation in iPhone OpenGL ES although fps is high

    - by guymic
    I am building a 2d OpenGL es application For iPad it displays a background texture and numerous textures on top of it which are always in motion. Every frame their location is recalculated based on time delta and speed and the entire thing is being rendered at 60 fps successfully, but still as the movement speed of the sprites raises, thing look stuttering. Any ideas? Are there inherit problems with what I'm doing? Are there known design patterns for smooth animation?

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  • Implementing a hilbert map of the internet

    - by Martin
    In the XKCD comic 195 a design for a map of the internet address space is suggested using a hilbert curve so that items from a similar IPs will be clustered together. Given an IP address, how would I calculate the 2D coordinates (in the range zero to one) that this IP is located on such a map?

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  • Display contents of file as binary.

    - by Eric Davidson
    Is there a good way to display the contents of a file as binary? I am creating a program that needs to save and load a 2D arrays from a files. When loading a saved file the result appears different. I need to be able to view the contents of the saved file in plain binary to tell if my problem in in my save or load function. Is there a program like octal dump but is binary dump? Thanks.

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  • What is an efficient way to find a non-colliding rectangle nearest to a location

    - by hyn
    For a 2D game I am working on, I am using y axis sorting in a simple rectangle-based collision detection. This is working fine, and now I want to find the nearest empty rectangle at a given location with a given size, efficiently. How can I do this? Is there an algorithm? I could think of a simple brute force grid test (with each grid the size of the empty space we're looking for) but obviously this is slow and not even a complete test.

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  • Working with a figure file in Matlab

    - by 49er
    I've got a .fig file showing the intensities of 2d data. How do I obtain the values when I load it in Matlab? Is it even possible? When I try playing with the children properties I am able to obtain only the size of my x and y vectors, not the values themselves which I don't know how to extract.

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  • "Use of uninitialised value" despite of memset

    - by Framester
    Hi there, I allocate a 2d array and use memset to fill it with zeros. #include<stdio.h> #include<string.h> #include<stdlib.h> void main() { int m=10; int n =10; int **array_2d; array_2d = (int**) malloc(m*sizeof(int*)); if(array_2d==NULL) { printf("\n Could not malloc 2d array \n"); exit(1); } for(int i=0;i<m;i++) { ((array_2d)[i])=malloc(n*sizeof(int)); memset(((array_2d)[i]),0,sizeof(n*sizeof(int))); } for(int i=0; i<10;i++){ for(int j=0; j<10;j++){ printf("(%i,%i)=",i,j); fflush(stdout); printf("%i ", array_2d[i][j]); } printf("\n"); } } Afterwards I use valgrind [1] to check for memory errors. I get following error: Conditional jump or move depends on uninitialised value(s) for line 24 (printf("%i ", array_2d[i][j]);). I always thought memset is the function to initialize arrays. How can I get rid off this error? Thanks! Valgrind output: ==3485== Memcheck, a memory error detector ==3485== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et al. ==3485== Using Valgrind-3.5.0-Debian and LibVEX; rerun with -h for copyright info ==3485== Command: ./a.out ==3485== (0,0)=0 (0,1)===3485== Use of uninitialised value of size 4 ==3485== at 0x409E186: _itoa_word (_itoa.c:195) ==3485== by 0x40A1AD1: vfprintf (vfprintf.c:1613) ==3485== by 0x40A8FFF: printf (printf.c:35) ==3485== by 0x8048724: main (playing_with_valgrind.c:39) ==3485== ==3485== ==3485== ---- Attach to debugger ? --- [Return/N/n/Y/y/C/c] ---- ==3485== Conditional jump or move depends on uninitialised value(s) ==3485== at 0x409E18E: _itoa_word (_itoa.c:195) ==3485== by 0x40A1AD1: vfprintf (vfprintf.c:1613) ==3485== by 0x40A8FFF: printf (printf.c:35) ==3485== by 0x8048724: main (playing_with_valgrind.c:39) [1] valgrind --tool=memcheck --leak-check=yes --show-reachable=yes --num-callers=20 --track-fds=yes --db-attach=yes ./a.out [gcc-cmd] gcc -std=c99 -lm -Wall -g3 playing_with_valgrind.c

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  • Open GL ES 1.1 and iPhone games

    - by MrDatabase
    Will iPhone games that draw 2D textures like this: glPushMatrix(); glTranslatef(xLoc, yLoc, 0); [myTexturePointer drawAtPoint:CGPointZero]; glPopMatrix(); work with newer iPhones (that support OpenGL ES 2.0)? I'm asking because I just learned OpenGL ES 2.0 doesn't support glPushMatrix etc. Cheers!

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  • Mobile Silverlight Applications

    - by snorlaks
    Hi, Have You got any tutorials, books, any good resources to start creating mobile games using silverlight ? Maybe any good resource on writing 2d games in silverlight for pc? Ay way do You think that its worth learning it or any other technology would be better and have probably shinier future ?

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  • C++ Converting image to integer array

    - by jonathanasdf
    How would I go about converting the pixels in an image (.png file) to an integer array, where each pixel is converted to its ARGB integer equivalent? I would like to do this without using external libraries. Not a 2D integer array by the way, a 1D one (where access is through array[row*width+col]). Thanks.

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  • Create a Color Picker, similar to Photoshop's, using Javascript and HTML Canvas

    - by André Alçada Padez
    I am not at all versed in Computer Graphics and am in need of creating a color picker as a javascript tool to embed in an HTML page. First, and looking at Photoshop's one, i thought of the RGB palette as a three-dimensional matrix. My first attempt envolved: <script type="text/javascript"> var rgCanvas = document.createElement('canvas'); rgCanvas.width = 256; rgCanvas.height = 256; rgCanvas.style.border = '3px solid black'; for (g = 0; g < 256; g++){ for (r = 0; r < 256; r++){ var context = rgCanvas.getContext('2d'); context.beginPath(); context.moveTo(r,g); context.strokeStyle = 'rgb(' + r + ', ' + g + ', 0)'; context.lineTo(r+1,g+1); context.stroke(); context.closePath(); } } var bCanvas = document.createElement('canvas'); bCanvas.width = 20; bCanvas.height = 256; bCanvas.style.border = '3px solid black'; for (b = 0; b < 256; b++){ var context = bCanvas.getContext('2d'); context.beginPath(); context.moveTo(0,b); context.strokeStyle = 'rgb(' + 0 + ', ' + 0 + ', ' + b + ')'; context.lineTo(20, b); context.stroke(); context.closePath(); } document.body.appendChild(rgCanvas); document.body.appendChild(bCanvas); </script> this results in something like My thought is this is too linear, comparing to the ones i see in Photoshop and on the web. I would like to know the logic behind the color mapping in a picker like this: I don't really need the algorythms itself, i'm mainly trying to understand the logic. Thanks

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  • Python : Crating Dynemic Functions

    - by jigar
    I have issue where i want to create Dynamic function which will do some calculation based to values retrieved from database, i am clear with my internal calculation but question in how to create dynamic class: My Structure is something like this : class xyz: def Project(): start = 2011-01-03 def Phase1(): effort = '2d' def Phase2(): effort = '3d' def Phase3(): effort = '4d' Now want to generate those all PhaseX() function dynamically so can any one suggest me how to achieve such thing using Python Code Waiting for Positive reply Regards Thank You

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  • Is there an image phase correlation library available for Python?

    - by kamasudra
    A project that involves image processing, i.e. to calculate the angular shift of the same image when shifted by a medium of certain Refractive Index. We have to build an app that correlates the 2 images (phase/2D correlation?) and then plot using Chaco and Mayavi (2 libraries in Python). Is there any other existing template software (FOSS) that we can base our app on, or use it as a reference?

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  • Passing table data to PRPT from xaction

    - by Manoj
    I am getting data from a query and processing it using Javascript in the xaction file. Now I want to pass the processed data (a 2D array) down to a prpt where it will be used to generate graph and table. What is the format in which Javascript would generate the data and how is it passed to and received by the prpt file from the xaction. Thanks...

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  • Is a display list best for this? (OpenGL)

    - by user146780
    I'm rendering 2D polygons with the GLUTesselator the first time, then they are stored in a display list for subsequent use. I think VBO's might be faster, but since I can't access the stuff that the tesselator outputs, and since it uses mixes of gl_triangle, quad, strip etc, i'm not sure how I could do this, even though I would like to use VBO's once the GLUTesselator is done with them for optimal performance. Thanks

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  • How to prevent overdrawing?

    - by afriza
    This is a difficult question to search in Google since it has other meaning in finance. Of course, what I mean here is "Drawing" as in .. computer graphics.. not money.. I am interested in preventing overdrawing for both 3D Drawing and 2D Drawing. (should I make them into two different questions?)

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  • Flip Vertices Array

    - by James
    Hi, I have an array of position vertices that make up a 2D polygon. Vector2[] _chassisConcaveVertices = { new Vector2(5.122f, 0.572f), new Vector2(3.518f, 0.572f), new Vector2(3.458f, 0.169f), new Vector2(2.553f, 0.169f), new Vector2(2.013f, 0.414f), new Vector2(0.992f, 0.769f), new Vector2(0.992f, 1.363f), new Vector2(5.122f, 1.363f), }; What algorithm can I use to modify the positions so the resultant polygon is flipped? I need to flip the polygon both horizontally and vertically.

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  • Understanding omission failure in distributed systems

    - by karthik A
    The following text says this which I'm not able to quite agree : client C sends a request R to server S. The time taken by a communication link to transport R over the link is D. P is the maximum time needed by S to recieve , process and reply to R. If omission failure is assumed ; then if no reply to R is received within 2(D+P) , then C will never recieve a reply to R . Why is the time here 2(D+P). As I understand shouldn't it be 2D+P ?

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