SFML drawing
May 15, 2013 at 8:13pm UTC
Hi, I try to make a text editor sort of in SFML. funny huh? anyway just testing the sf::Text class. But this code does not display the character on the screen. I am sure the problem is in the event loop.
Code:
1/********************************************************************
aim:
-
********************************************************************/
//headers
#include <SFML/Graphics.hpp>
//namespaces
//other definitions and declarations
//main function
int main()
{
sf::RenderWindow *mainWnd=new sf::RenderWindow(sf::VideoMode(800,600),L"Prog-2: Main Window" );
if (mainWnd!=NULL)
{
sf::Event evtMainWnd;
sf::Text msg;
sf::String tmp;
msg.setColor(sf::Color(0,255,0));
msg.setCharacterSize((unsigned )30);
while (mainWnd->isOpen())
{
while (mainWnd->pollEvent(evtMainWnd))
{
switch (evtMainWnd.type)
{
case sf::Event::Closed:
mainWnd->close();
break ;
case sf::Event::KeyPressed:
if (evtMainWnd.key.code==sf::Keyboard::Q)
{
tmp+=msg.getString();
msg.setString(tmp);
}
default :
break ;
}
}
mainWnd->clear();
mainWnd->draw(msg);
mainWnd->display();
}
delete mainWnd;
}
return 0;
}
Aceix.
May 15, 2013 at 9:32pm UTC
...
May 15, 2013 at 10:15pm UTC
I believe the standard Ariel font was removed a while ago, maybe you should add a font. See the SFML documentation for more information.
May 16, 2013 at 9:34am UTC
Thanks a lot! thought it was still there as in v1.6(SFML).
May 16, 2013 at 9:41am UTC
...Added a font but still won't show on screen. any idea?
I did this:
1sf::Font monotypeCorsiva;
monotypeCorsiva.loadFromFile("MTCORSVA.TTF" );
msg.setFonf(monotypeCorsiva);
I also made sure that the object is still alive, and the font file is present. compiles and shows no error, but still doesn't work!
Aceix.
Last edited on May 16, 2013 at 9:46am UTC
May 16, 2013 at 9:52am UTC
I think the problem is in lines 39 and 40. You add the string of msg to tmp, and then set msg's string to tmp. But since msg's string is empty, tmp will be empty true and msg will stay empty.
And by the way, when dealing with entered text in SFML it's much handier to use the TextEntered event:
http://sfml-dev.org/tutorials/2.0/window-events.php , scroll down to 'The TextEntered event'.
Last edited on May 16, 2013 at 9:55am UTC
May 16, 2013 at 10:56am UTC
Thank you Fransje, I'll try that.
May 16, 2013 at 1:44pm UTC
Ok so it worked. Thanks to you all!
Here is the final code:
1/********************************************************************
aim:
-
********************************************************************/
//headers
#include <SFML/Graphics.hpp>
//namespaces
//other definitions and declarations
//main function
int main()
{
sf::RenderWindow *mainWnd=new sf::RenderWindow(sf::VideoMode(800,600),L"Prog-2: Main Window" );
if (mainWnd!=NULL)
{
sf::Event evtMainWnd;
sf::Text msg;
sf::String tmp;
sf::Font monotypeCorsiva;
monotypeCorsiva.loadFromFile("MTCORSVA.TTF" );
msg.setColor(sf::Color(0,255,0));
msg.setCharacterSize((unsigned )30);
msg.setFont(monotypeCorsiva);
while (mainWnd->isOpen())
{
while (mainWnd->pollEvent(evtMainWnd))
{
switch (evtMainWnd.type)
{
case sf::Event::Closed:
mainWnd->close();
break ;
case sf::Event::KeyPressed:
if (evtMainWnd.key.code==sf::Keyboard::Q)
{
tmp=msg.getString();
tmp+="q" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::W)
{
tmp=msg.getString();
tmp+="w" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::E)
{
tmp=msg.getString();
tmp+="e" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::R)
{
tmp=msg.getString();
tmp+="r" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::T)
{
tmp=msg.getString();
tmp+="t" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::Y)
{
tmp=msg.getString();
tmp+="y" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::U)
{
tmp=msg.getString();
tmp+="u" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::I)
{
tmp=msg.getString();
tmp+="i" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::O)
{
tmp=msg.getString();
tmp+="o" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::P)
{
tmp=msg.getString();
tmp+="p" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::A)
{
tmp=msg.getString();
tmp+="a" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::S)
{
tmp=msg.getString();
tmp+="s" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::D)
{
tmp=msg.getString();
tmp+="d" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::F)
{
tmp=msg.getString();
tmp+="f" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::G)
{
tmp=msg.getString();
tmp+="g" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::H)
{
tmp=msg.getString();
tmp+="h" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::J)
{
tmp=msg.getString();
tmp+="j" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::K)
{
tmp=msg.getString();
tmp+="k" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::L)
{
tmp=msg.getString();
tmp+="l" ;
msg.setString(tmp);
}if (evtMainWnd.key.code==sf::Keyboard::Z)
{
tmp=msg.getString();
tmp+="z" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::X)
{
tmp=msg.getString();
tmp+="x" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::C)
{
tmp=msg.getString();
tmp+="c" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::V)
{
tmp=msg.getString();
tmp+="v" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::B)
{
tmp=msg.getString();
tmp+="b" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::N)
{
tmp=msg.getString();
tmp+="n" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::M)
{
tmp=msg.getString();
tmp+="m" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::Space)
{
tmp=msg.getString();
tmp+=" " ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::Return)
{
tmp=msg.getString();
tmp+="\n" ;
msg.setString(tmp);
}
if (evtMainWnd.key.code==sf::Keyboard::BackSpace)
{
tmp=msg.getString();
std::string tmp2(tmp.toAnsiString());
if (!tmp2.empty())
tmp2.pop_back();
tmp=tmp2;
msg.setString(tmp);
}
default :
break ;
}
}
mainWnd->clear();
mainWnd->draw(msg);
mainWnd->display();
}
delete mainWnd;
}
return 0;
}
Aceix.
May 16, 2013 at 1:51pm UTC
Lines 40-206 can be drastically simplified with
std::map<decltype(sf::Keyboard::A), std::string>
16 sf::RenderWindow *mainWnd=new sf::RenderWindow(sf::VideoMode(800,600),L"Prog-2: Main Window" );
if (mainWnd!=NULL)
{
The if statement will always be true, new will never return null. You're supposed to just do this:
16sf::RenderWindow mainWnd (sf::VideoMode(800,600),L"Prog-2: Main Window" );
//No need to use pointers
Last edited on May 16, 2013 at 1:52pm UTC
May 16, 2013 at 1:54pm UTC
Thanks. I'll take that into consideration.
Last edited on May 16, 2013 at 1:57pm UTC
May 16, 2013 at 2:16pm UTC
17std::map<decltype (sf::Keyboard::A), std::string> keymap
{
{sf::Keyboard::A, "a" },
{sf::Keyboard::B, "b" },
{sf::Keyboard::C, "c" },
{sf::Keyboard::D, "d" },
{sf::Keyboard::E, "e" },
{sf::Keyboard::F, "f" },
{sf::Keyboard::G, "g" },
//...
};
39 case sf::Event::KeyPressed:
auto it = keymap.find(evtMainWnd.key.code);
if (it != keymap.end())
{
tmp = msg.getString();
tmp += it->second;
msg.setString(tmp);
}
break ;
May 16, 2013 at 2:36pm UTC
Even more simplified:
1case sf::Event::TextEntered:
if ( evtMainWnd.text.unicode < 128 ) // check if it's a printable character
{
tmp += static_cast < char > ( evtMainWnd.text.unicode );
msg.setString( tmp );
}
break ;
May 16, 2013 at 5:25pm UTC
Thanks to you all.
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