Messages

1

General / Re: Bullet positioning (updated)

« on: December 07, 2014, 06:04:14 am »

Think about the numbers and what is happening to them in a loop. It may also be good to get a good grasp on vectors and trigonometry.

Right triangle
           \
            \
             \/
             
             |\
opposite ->  | \  <-hypotenuse
             |__\
               ^
               | adjacent
 

sin - takes in an angle, and returns a ratio that can exist in the sides, if you multiply this ratio by the length of the hypotenuse, you get the length of the side, sin = opposite / hypotenuse

cos - like sin, cos takes in an angle, and returns a ratio that can exist in the sides, again, if you multiply this ratio by the length of the hypotenuse, you get the length of the side, sin = adjacent / hypotenuse

tan - opposite / adjacent

sin^-1 or asin - this does the opposite of sin, it takes in a ratio and spits out an angle in radians

cos^-1 or acos - this does the opposite of cos, it takes in a ratio and returns an angle in radians

tan^-1 or atan - the opposite of tan adjacent / opposite
 

Think of them like little programming functions.

Now think of these in a graph, and where the numbers are going, like so
f( x ) = x^2, x@1 = 1, x@2 = 4, x@3 = 9...
Then think of what you are going to do with those numbers, so think for example of what cos/sin do, then use that data in a mathematical formula, and think of that mathematical formula along a graph, and try to figure out if those numbers are what you want, or what you want to do with them, and if you are devising a formula to work well with them.

I don't know if you know trig or how good you are with math, I hope I gave you relevant advice!

Peace!

2

General / Re: **whats the problem?** Program.exe has stop working

« on: December 07, 2014, 05:50:28 am »

Hello!

    When you call

(*it)->createBullet(bulletTexture,bulletImage,shipImage);

it does not appear as though there are any elements in the array, and

(*it)

is null which is why the program might be crashing.

Let me know :-)
 - TFB

3

General / Re: SFML 1.6 On Ubuntu

« on: December 07, 2014, 01:35:50 am »

I figured it out! It was not too hard, all I did was make symbolic links for all the shared libraries like so:

Code: [Select]

Prototype:
ln -s /usr/lib/SFML/libMODULE-sfml.so.1.6 /usr/lib/SFML/libMODULE-sfml.so
Example:
ln -s /usr/lib/SFML/libgraphics-sfml.so.1.6 /usr/lib/SFML/libgraphics-sfml.so

Then I just added all the directories of /usr/lib/SFML and /usr/lib/SFML16 to ldconfig:

Code: [Select]

sudo ldconfig /usr/lib/SFML16

You have to do ldconfig every time you switch, so I added it to the script.

If you want the code I have attached the script and test code, compile with...:

Code: [Select]

g++ -std=c++11 -L /usr/lib/SFML test21.cpp -lsfml-graphics -lsfml-window -lsfml-system

and...

Code: [Select]

g++ -std=c++11 -L /usr/lib/SFML test16.cpp -lsfml-graphics -lsfml-window -lsfml-system

You can use the script if you put it in /usr/local/bin/sfml_change, and make a link to the bin folder via:

Code: [Select]

ln -s  /usr/local/bin/sfml_change/chsfml.sh /usr/bin/chsfml

So you can run it any time from the command line, to use the script...

Code: [Select]

Change to SFML 2.1:
chsfml -sfml21
Change to SFML 1.6:
chsfml -sfml16
Clean all links:
chsfml -clean
Help:
chsfml -h

Errors happen every time complaining about symbolic links, unless it does not work (test it first), ignore them.


The files should be set up like so...

Code: [Select]

SFML library files (taken OUT of the original folders i.e /usr/lib/SFML16/libgraphics-sfml.so.1.6) should go into
/usr/lib/SFML16
/usr/lib/SFML21
SFML header files should go into (taken OUT of original folders, i.e /usr/include/SFMLInclude/SFML16/Graphics.hpp):
/usr/include/SFMLInclude/SFML16
/usr/include/SFMLInclude/SFML21

I might throw this up on github, Il post a link if I do

I hope this helps someone! Peace! :-D

4

General / SFML 1.6 On Ubuntu

« on: December 04, 2014, 01:37:19 am »

Hello!

   Wow! It has been a while since I was here last! Whats up  ? I wonder if there are any other old SFMLers here, give me a shout if you used SFML back in 2009/2010 XD ? Anyway, I decided if I may just want to port an old project to linux http://gcggames.webs.com/WSL/Site/main.html, and I also wanted to use the new release for future proejcts (or port the project over to SFML 2.1). So I made a few switch scripts to switch from SFML 2.1, and SFML 1.6 on my system:

Code: [Select]

#!/bin/bash


if [ $1 = "-h" ] || [ $1 = "--help" ]; then
echo "-h This help diolouge."
echo "-sfml16 Set up SFML 1.6"
echo "-sfml21 Set up SFML 2.1"
echo "-clean Clean all links, do not set up a SFML"
else

echo "Dont mind the clean up errors."

sudo unlink /usr/include/SFML/SFML16
sudo unlink /usr/include/SFML/SFML21
sudo unlink /usr/include/SFML


sudo unlink /usr/lib/SFML16
sudo unlink /usr/lib/SFML21
sudo unlink /usr/lib/SFML/SFML16
sudo unlink /usr/lib/SFML/SFML21
sudo unlikn /usr/lib/SFML

sudo rm /usr/include/SFML
sudo rm /usr/lib/SFML

echo "Clean up complete, starting link."

if [ $1 = "-sfml16" ]; then
sudo ln -s /usr/include/SFMLInclude/SFML16 /usr/include/SFML
sudo ln -s /usr/lib/SFML16 /usr/lib/SFML
else
if [ $1 = "-sfml21" ]; then
sudo ln -s /usr/include/SFMLInclude/SFML21 /usr/include/SFML
sudo ln -s /usr/lib/SFML21 /usr/lib/SFML
fi
fi
fi




It works fine when I am using SFML 2.1 where the library .so files are in /usr/lib/SFML21 and have a symbolic link to /usr/lib/SFML, and where the include files are in /usr/include/SFMLInclude/SFML21 with another symbolic link to /usr/include/SFML

However while the symbolic links and such work with SFML 1.6 (i.e ls /usr/lib/SFML shows the 1.6 files), the linker cant seem to find the files when I try

Code: [Select]

g++ -std=c++11 -L /usr/lib/SFML -m64 -l sfml-graphics -l sfml-window -l sfml-system test.cpp (I have tried rearranging the commands and omitting the -std=c++11 flag).

The 1.6 files are in /usr/lib/SFML16 and /usr/include/SFMLInclude/SFML16 and the symbolic links seem to work, I tried running ldcondfig but it did nothing.

Any help is appreciated!

Thanks :-)

 - TFB