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Stonecycle · 24th October 2012

To get a number from a JTextField, I suggest adding an ActionListener to it, just like you would to a JButton. Keep in mind that this requires pressing Enter.
If you wish to convert as soon as the user stops typing, a clean way of doing this would be adding a FocusListener to the text field and implementing the focusLost method to call the conversion method. This will convert the units when the text field component loses focus (e.g. when you click on something else).

As far as the combo boxes go, they also work with ActionListeners — whenever a user selects an option, the listener is triggered. This, of course, means that you can do something along the lines of this:

Got the JComboBox updater working, but now it's not executing the method f2c. Enumerators are out of the question due to class assignment. Been working on it since last week and it's due tomorrow sometime and all that.

package tempconv;

import javax.swing.*;
import java.awt.event.*;

public class Tempconv {
  //  FAHRENHEIT
  static double f2c(double temp)  {	  //  Fahrenheit/Imperial to Celsius/Metric (°F-°C)
	return (5/9)*(temp-32);	}
  
  static double f2k(double temp)  {	  //  Fahrenheit/Imperial to Kelvin (°F-°K)
	return (temp + 459.67) * (5/9);	}
  //  CENTIGRADES
  static double c2f(double temp)  {	  // Celsius/Metric to Fahrenheit/Imperial (°C-°F)
	return temp * (9/5) + 32; }
  
  static double c2k(double temp) {	  //  Celsius/Metric to Kelvin (°C-°K)
	return temp+273.15;	}
  //  KELVIN
  static double k2f(double temp)  {	  //  Kelvin to Fahrenheit/Imperial (°K-°F)
	return temp * (9/5) - 459.67; }
  
  static double k2c(double temp)  {	  //  Kelvin to Celsius/Metric (°K-°C)
	return temp - 273.15; }

  
  
  static void check(double temp, String from, String to)  {
	final ui frame = new ui();
	if (from.equals("°F") && to.equals("°C")) {
	  //double buff = Double.parseDouble(frame.txt_Temp.getText());
	  frame.l_result.setText(Double.toString(f2c(temp)));	  }
  }
  
  public static void main(String[] args) {	
	//	Let's set up some frame properties here, first.
	final ui frame = new ui();
	frame.setVisible(true);
	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	frame.setSize(275, 85);
	frame.setResizable(false);
	
	frame.cb_fromunit.addActionListener(new ActionListener()  {
	  @Override
	  public void actionPerformed(ActionEvent evt)	{
		
	  }
	  });
	frame.cb_tounit.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent evt) {
        // Set your unit field or w/e you have to comboBoxUnits.getSelectedItem(), then call the conversion method.
        //	DO WHATEVER on this line, preferrably run temp. conversion
	  //double temp = Double.parseDouble(frame.txt_Temp.getText());
	  //frame.l_result.setText(Double.toString(f2c(temp)));
	  Object from = frame.cb_fromunit.getSelectedItem();
	  Object to = frame.cb_tounit.getSelectedItem();
	  check(Double.parseDouble(frame.txt_Temp.getText()), from.toString(), from.toString());
    }
});

	
	
  }}

**Lexic** · 24th October 2012

chaoselite posted:

When I compile I get thrown a bad_alloc. I think it is either coming from my read function not remembering the char array. can someone help?
Also when I add 1 to the length of the char array then it doesn't load the file and the program crashes.

You're using free() on something that's been new[]'d. You have to use delete[].
Also, since you're using C++ and not C, stop mucking about with the heap unnecessarily.
How to read a whole ASCII file into a C++ std::string

**CanadianBill** · 24th October 2012

I have a rather simple (I think) question. I'm trying to understand this code, I've got it all down except the very end "map" function.
The original code is here: http://grathio.com/2009/11/secret_kn...ing_door_lock/

Here's the part I don't understand. How does it "normalize it" and just get the tempo rather than the timing?

Code:

  for (i=0;i<maximumKnocks;i++){ // Normalize the times
    knockReadings[i]= map(knockReadings[i],0, maxKnockInterval, 0, 100);      
    timeDiff = abs(knockReadings[i]-secretCode[i]);
    if (timeDiff > rejectValue){ // Individual value too far out of whack
      return false;
    }
    totaltimeDifferences += timeDiff;
  }

Thanks!

Mozartkugeln · 24th October 2012

Stonecycle posted:

Code:

    @Override
    public void actionPerformed(ActionEvent evt) {
        // Set your unit field or w/e you have to comboBoxUnits.getSelectedItem(), then call the conversion method.
        //	DO WHATEVER on this line, preferrably run temp. conversion
	  //double temp = Double.parseDouble(frame.txt_Temp.getText());
	  //frame.l_result.setText(Double.toString(f2c(temp)));
	  Object from = frame.cb_fromunit.getSelectedItem();
	  Object to = frame.cb_tounit.getSelectedItem();
	  check(Double.parseDouble(frame.txt_Temp.getText()), from.toString(), from.toString());
    }

You're passing in the same unit twice, i.e. you're converting from one unit to that exact same unit.

I suggest making temp, from and to private fields so you don't have to constantly pass them into the method as arguments; furthermore, your conversion methods and your check() method should be private as well since you wouldn't need them outside that particular class.

Stonecycle · 24th October 2012

Mozartkugeln posted:

You're passing in the same unit twice, i.e. you're converting from one unit to that exact same unit.

I suggest making temp, from and to private fields so you don't have to constantly pass them into the method as arguments; furthermore, your conversion methods and your check() method should be private as well since you wouldn't need them outside that particular class.

Fixed that stuff after asking that time. Next problem is that the conversions are outputting as 0.0, but it identifies when to go negative. Testing with f2c first.

static double f2c(double temp)  {	  //  Fahrenheit/Imperial to Celsius/Metric (°F-°C)
	return ((temp-32) * (5/9));	}

Bazkip · 24th October 2012

Topgamer7 posted:

I think you just probably need to surround your matches with [].

Edit: Dear got that was a terrible sentence.

Oh jesus how did I forget that

Thanks.

Still have no idea how to get the " in the regex though, since I can't escape that

Here's an update of what I've got now

Dim specialRegex As New Regex("[!%&'*,-./" + Regex.Escape("+*#()$]"))

Mozartkugeln · 24th October 2012

Stonecycle posted:

Code:

static double f2c(double temp)  {	  //  Fahrenheit/Imperial to Celsius/Metric (°F-°C)
	return ((temp-32) * (5/9));	}

5 and 9 are ints, so the / operator makes the quotient an int as well. Replace "5/9" with "5.0/9.0" and you should be good.

Edited:

Bazkip posted:

Still have no idea how to get the " in the regex though, since I can't escape that

Use two quotation marks to escape it. For example, "This is a ""string"" literal" should come out as:

Code:

This is a "string" literal

Topgamer7 · 24th October 2012

Bazkip posted:

Oh jesus how did I forget that

Thanks.

Still have no idea how to get the " in the regex though, since I can't escape that

Here's an update of what I've got now

Dim specialRegex As New Regex("[!%&'*,-./" + Regex.Escape("+*#()$]"))

Typically in regex you use back slash to escape characters. so you would put something like "[!%\"]" for your regex. I don't think you need the Regex.Escape part. But I'm not that great with VB

Stonecycle · 24th October 2012

Thank you guys, nearly done (and understanding it a little more), but there's one flaw left: the JLabel l_result is not updating within the check() method, so I placed a test l_result.setText() after. I say it's something wrong within check().

  private static void check(double temp, int from, int to)  {

	formulae f = new formulae();
	final ui frame = new ui();
	double save;
	
	DecimalFormat tuPoint = new DecimalFormat("0.00");
	//int fromunit = frame.cb_fromunit.getSelectedIndex();
	//int tounit = frame.cb_tounit.getSelectedIndex();
	//	0 for F, 1 for C, 2 for K
	
	if (from == 0 && to == 0) {
	  System.out.printf("Fahrenheit stays at %.2f°F\n", temp);
	  frame.l_result.setText(Double.toString(temp));}
	else if (from == 0 && to == 1) {
	  System.out.printf("Fahrenheit to Celsius, %.2f°C\n", f.f2c(temp));
	  save = f.f2c(temp); tuPoint.format(save);	temp = save;
	  frame.l_result.setText(Double.toString(f.f2c(temp)));}
	else if (from == 0 && to == 2)	{
	  System.out.printf("Fahrenheit to Kelvin, %.2f°K\n", f.f2k(temp));
	  frame.l_result.setText(Double.toString(f.f2k(temp)));	}
	
	else if (from == 1 && to == 0)	{
	  System.out.printf("Celsius to Fahrenheit, %.2f\n", f.c2f(temp));
	  //frame.l_result.setText(toString(f.c2f(temp)));}

Think I at least know it's involving Double.toString(), but when I end it with .toString(), it keeps saying "double cannot be dereferenced." Actually, it's not even setting text.

Bazkip · 25th October 2012

Mozartkugeln posted:

Use two quotation marks to escape it. For example, "This is a ""string"" literal" should come out as:

Code:

This is a "string" literal

Already tried that, didn't work for some reason

Topgamer7 posted:

Typically in regex you use back slash to escape characters. so you would put something like "[!%\"]" for your regex. I don't think you need the Regex.Escape part. But I'm not that great with VB

VB doesn't have the backslash escape character unfortunately

Mozartkugeln · 25th October 2012

Stonecycle posted:

Code:

  formulae f = new formulae();
  final ui frame = new ui();
  double save;

OOP does not work like that. You're making a new, invisible ui object every time that method is called, and you're putting it in a local variable. You're actually doing the same in the main method. If you want to be able to reference the frame you set-up outside the main method, you must make it an instance field.

public static void main(String[] args) {
	final ui frame = new ui();
	frame.setVisible(true);
	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	// etc.
}

becomes

private final ui frame = new ui();

public static void main(String[] args) {
	frame.setVisible(true);
	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	// etc.
}

You will then be able to access the frame you see on the screen anywhere in the class, given that you don't shadow it by making local variables of the same name like you did in the check() method (the line highlighted in the first code snippet, remove it from your code).
I also have several other gripes with your code: Since you're converting the results you get from the temperature conversion methods in each of the else-if blocks, why not put the Double.toString() calls in those methods and then return the Strings? Also, I don't understand why you would need a separate class just for the formulas.

Stonecycle posted:

Think I at least know it's involving Double.toString(), but when I end it with .toString(), it keeps saying "double cannot be dereferenced." Actually, it's not even setting text.

Primitive data types don't have any methods; you, therefore, have to use the associated lang classes.

double d = 1.618

System.out.println(d.toString()) // Syntax error, won't even compile
System.out.println(Double.toString(d)) // Prints fine

Edited:

Bazkip posted:

Already tried that, didn't work for some reason

Hmm, have you tried doing it inside Regex.Escape()?

oc3 · 25th October 2012

snip

**Lexic** · 25th October 2012

The inside of the FILE structure is nothing to do with you.
If you get given a non-NULL pointer then either a) you now have a valid file handle or b) your entire OS is broken.

**esalaka** · 25th October 2012

Why are you even using FILE in C++

oc3 · 25th October 2012

esalaka posted:

Why are you even using FILE in C++

Bad habit "/
It's working fine now after changing to fstream.

Stonecycle · 25th October 2012

Mozartkugeln posted:

I also have several other gripes with your code: Since you're converting the results you get from the temperature conversion methods in each of the else-if blocks, why not put the Double.toString() calls in those methods and then return the Strings? Also, I don't understand why you would need a separate class just for the formulas.

I actually tried this, yet the JLabel won't update.

frame.l_result.setText(Double.toString(f.c2k(temp)));

And this:

private final ui frame = new ui();

public static void main(String[] args) {
	frame.setVisible(true);
	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	// etc.
}

won't work unless the main() isn't static, and it won't run if it's not a public static void main(String[] args).

Mozartkugeln · 25th October 2012

Stonecycle posted:

I actually tried this, yet the JLabel won't update.

You're shadowing the frame field with a local variable of the same name. Read my previous post again.

Stonecycle posted:

won't work unless the main() isn't static, and it won't run if it's not a public static void main(String[] args).

Then make a non-static method and call it from main? :V

Edited:

Actually, post your whole class in its current state.

Stonecycle · 25th October 2012

Mozartkugeln posted:

You're shadowing the frame field with a local variable of the same name. Read my previous post again.

Then make a non-static method and call it from main? :V

Edited:

Actually, post your whole class in its current state.

Managed to fix it somehow. Now the formatting of the JLabel's all I got left and that I think I can do on my own.

demoTron · 25th October 2012

So after visiting WAYWO I decided to make my own color grid program ( its just a grid with each piece being a random color)
Using c++ with SFML. It works, but the problem is the CPU usage. If I limit my fps to 60 it still uses about 30%
My code:

#include <SFML\Graphics.hpp>
#include <cstdlib>
#include <ctime>
#include <iostream>
#include <vector>

using namespace std;

int main()
{
	//Initialization start
	srand(time(0));
	sf::RenderWindow window(sf::VideoMode(640,480),"Color");
	window.setFramerateLimit(60);
	vector<sf::RectangleShape> gridvec;
	sf::RectangleShape grid;
	
	grid.setSize(sf::Vector2f(10,10));
	
	for ( int x = 0; x < 64; ++x )
	{
		for (int y = 0; y < 48; ++y )
		{
			grid.setPosition(x*10,y*10);
			gridvec.push_back(grid);
			
		}

	}
	for (int i = 0; i < gridvec.size();++i)
	{
		gridvec[i].setFillColor(sf::Color(rand()%256,rand()%256,rand()%256));
	}
	//Initialization end
	
	//Main loop
    while (window.isOpen())
    {
        sf::Event event;
        while (window.pollEvent(event))
        {
           
            if (event.type == sf::Event::Closed)
                window.close();
        }
		if(sf::Keyboard::isKeyPressed(sf::Keyboard::Space)) //Generates new colors
		{
			for (int i = 0; i < gridvec.size();++i)
			{
				gridvec[i].setFillColor(sf::Color(rand()%256,rand()%256,rand()%256));
			}
		}
		
		//Drawing time
		window.clear();
		for (int i = 0; i < gridvec.size();++i)
		{
			window.draw(gridvec[i]);
		}

		window.display();
	}
	
}

I guess it's because the rectangles are being redrawn so frequently. Any ideas how to lower it ?

Eudoxia · 25th October 2012

Maybe not the best place to post this, but I was wondering: If I write a binding to a library that includes a function that loads and links the library, and put that binding in my compiler's Standard Library, do I have to change the license? Or does writing bindings not count as license infringement or whatever?

**robmaister12** · 25th October 2012

Eudoxia posted:

Maybe not the best place to post this, but I was wondering: If I write a binding to a library that includes a function that loads and links the library, and put that binding in my compiler's Standard Library, do I have to change the license? Or does writing bindings not count as license infringement or whatever?

It depends on the license and the linking method. IANAL, but if you're talking about the GPL, then I think it's that dynamic linking of the library is fine but static linking is not. More permissive (MIT, BSD, zlib, etc.) licenses don't care at all.

Eudoxia · 25th October 2012

robmaister12 posted:

It depends on the license and the linking method. IANAL, but if you're talking about the GPL, then I think it's that dynamic linking of the library is fine but static linking is not. More permissive (MIT, BSD, zlib, etc.) licenses don't care at all.

I think my compiler dynamically links things. 'Think' because this not-quite-compile-time-and-not-quite-run-time thing about JIT compilation always confuses me. Thanks.

**robmaister12** · 25th October 2012

Dynamic linking means that the licensed library is in it's own separate file. Static linking basically means that the entire library is copied into your library/executable.

Eudoxia · 26th October 2012

robmaister12 posted:

Dynamic linking means that the licensed library is in it's own separate file. Static linking basically means that the entire library is copied into your library/executable.

I think both are happening :I

**elevate** · 26th October 2012

How do I get SFML 1.6 (or 2.0) to work with GCC 4.7.0 and Code::Blocks 10.05, both of which are separate and not part of a package like the Code::Blocks/MinGW thing is?

I am having nothing but problems.

**ShaunOfTheLive** · 26th October 2012

elevate posted:

How do I get SFML 1.6 (or 2.0) to work with GCC 4.7.0 and Code::Blocks 10.05, both of which are separate and not part of a package like the Code::Blocks/MinGW thing is?

I am having nothing but problems.

Hmm, it really shouldn't matter that they're not in a package together. As long as GCC can see it, Code::Blocks really has nothing to do with it. Code::Blocks just calls GCC, which then looks for SFML headers and libraries. You can put them directly in the GCC subfolders if you want (that's usually the easiest way).

ElementalCreeds · 26th October 2012

Been trying to make a button in VB that can mute a program through the mixer, Anybody know how i could do this, Nothing is really working.

**elevate** · 26th October 2012

ShaunOfTheLive posted:

Hmm, it really shouldn't matter that they're not in a package together. As long as GCC can see it, Code::Blocks really has nothing to do with it. Code::Blocks just calls GCC, which then looks for SFML headers and libraries. You can put them directly in the GCC subfolders if you want (that's usually the easiest way).

Man I got it working. Had to build SFML 2.0 with MinGW w/ GCC 4.7.0.

For anyone who's interested: http://sfmlcoder.wordpress.com/2011/...th-mingw-make/

**Ehmmett** · 26th October 2012

what would cause #plr.collision.point to be 0 when plr.collision.point.down.x works as it should?

Edited:

in lua. btw

Edited:

does the array count not count any sub-array's?

**Lexic** · 26th October 2012

demoTron posted:

So after visiting WAYWO I decided to make my own color grid program ( its just a grid with each piece being a random color)
Using c++ with SFML. It works, but the problem is the CPU usage. If I limit my fps to 60 it still uses about 30%
My code:

#include <SFML\Graphics.hpp>
#include <cstdlib>
#include <ctime>
#include <iostream>
#include <vector>

using namespace std;

int main()
{
	//Initialization start
	srand(time(0));
	sf::RenderWindow window(sf::VideoMode(640,480),"Color");
	window.setFramerateLimit(60);
	vector<sf::RectangleShape> gridvec;
	sf::RectangleShape grid;
	
	grid.setSize(sf::Vector2f(10,10));
	
	for ( int x = 0; x < 64; ++x )
	{
		for (int y = 0; y < 48; ++y )
		{
			grid.setPosition(x*10,y*10);
			gridvec.push_back(grid);
			
		}

	}
	for (int i = 0; i < gridvec.size();++i)
	{
		gridvec[i].setFillColor(sf::Color(rand()%256,rand()%256,rand()%256));
	}
	//Initialization end
	
	//Main loop
    while (window.isOpen())
    {
        sf::Event event;
        while (window.pollEvent(event))
        {
           
            if (event.type == sf::Event::Closed)
                window.close();
        }
		if(sf::Keyboard::isKeyPressed(sf::Keyboard::Space)) //Generates new colors
		{
			for (int i = 0; i < gridvec.size();++i)
			{
				gridvec[i].setFillColor(sf::Color(rand()%256,rand()%256,rand()%256));
			}
		}
		
		//Drawing time
		window.clear();
		for (int i = 0; i < gridvec.size();++i)
		{
			window.draw(gridvec[i]);
		}

		window.display();
	}
	
}

I guess it's because the rectangles are being redrawn so frequently. Any ideas how to lower it ?

You only need to redraw the rectangles if they've changed. Try shifting the clear() and draw() calls up into the if statement.

Bazkip · 26th October 2012

Mozartkugeln posted:

Use two quotation marks to escape it. For example, "This is a ""string"" literal" should come out as:

Code:

This is a "string" literal

Oh wait, wasn't doing it right before, got it to work now

Dim specialRegex As New Regex("[!%&'*,-./" + Regex.Escape("+*#()$") + ("""""]"))

Jesus that's ugly. Thanks though!

**G4MB!T** · 26th October 2012

does anyone know where i can get a library or something similar that will allow me to interact with my g15 LCD using C++? (ie drawing text, shapes, etc on the lcd)

**MakeR** · 26th October 2012

G4MB!T posted:

does anyone know where i can get a library or something similar that will allow me to interact with my g15 LCD using C++? (ie drawing text, shapes, etc on the lcd)

They keyboard comes with an SDK for C++. Apparently it is located in C:\Program Files\Logitech G15\SDK\.

**G4MB!T** · 26th October 2012

oh thanks heaps :D

**esalaka** · 26th October 2012

Ehmmett posted:

what would cause #plr.collision.point to be 0 when plr.collision.point.down.x works as it should?

Edited:

in lua. btw

Edited:

does the array count not count any sub-array's?

Array count counts sequential numeric indices

Edited:

Starting from 1, I believe

**Ezhik** · 26th October 2012

So I'm attempting to create this game idea: http://www.squidi.net/three/entry.php?id=63

I want to use SFML+Box2D and write it in C++. Is that a good combo?

**elevate** · 26th October 2012

Anyone know how to register for Visual Studio Express 2012 without being part of a business? If it's legal of course.

**ief014** · 27th October 2012

Quick question:
Is there a way for a c/c++ header file ignore external macros/defines? Perhaps some #pragma directive?

In vs2010.

**Lexic** · 27th October 2012

ief014 posted:

Quick question:
Is there a way for a c/c++ header file ignore external macros/defines? Perhaps some #pragma directive?

In vs2010.

Code:

#define FOO_ FOO
#undef FOO

// ...

#define FOO FOO_

?

**Hypershadsy** · 27th October 2012

MakeR posted:

They keyboard comes with an SDK for C++. Apparently it is located in C:\Program Files\Logitech G15\SDK\.

Here's a .NET binding too:
http://lglcdnet.codeplex.com/