Console: which implementation-style prefered?
Posted: Sun Oct 02, 2005 7:18 pm
Hello everybody!
Sorry for the long post in advance!
I'm rather new to irrlicht and began to develop a quake-style console-class (yes, i know irrconsole, but don't like it though it is good work) and just want to ask you a question concerning the implementation of command execution.
Which way would you prefer?
1. class inheritance: Each command has to inherit a base class ( say CCommand ) and reimplement a run/invoke function. Parsed arguments are handled by the implemenation of the respective command. (the way irrconsole does it)
2. function pointers: Each command is represented by a function (say with parameters format [ representing the order of arguments, e.g. "ffss" for "float" "float" "string" "string" ] and the args-array). (my way)
Just an example how an implementation of a setcolor function would look like:
the registration of the command looks like this:
I think this is the easiest way or is it a bad idea to use function pointers just for simplicity reasons?
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Next problem I got is, that Irrlicht apparently ignores the alpha color component when drawing fonts (with guifont) and drawing an image using draw2DImage leading to a black background of my console while it is moving out. Do I have to use materials for that purpose ?
Does anyone know how to fix this?
Thx in advance,
apriori
Sorry for the long post in advance!
I'm rather new to irrlicht and began to develop a quake-style console-class (yes, i know irrconsole, but don't like it though it is good work) and just want to ask you a question concerning the implementation of command execution.
Which way would you prefer?
1. class inheritance: Each command has to inherit a base class ( say CCommand ) and reimplement a run/invoke function. Parsed arguments are handled by the implemenation of the respective command. (the way irrconsole does it)
2. function pointers: Each command is represented by a function (say with parameters format [ representing the order of arguments, e.g. "ffss" for "float" "float" "string" "string" ] and the args-array). (my way)
Just an example how an implementation of a setcolor function would look like:
Code: Select all
void ConFn_Color( const core::stringw &format, const parameters ¶ms, CCommand *cmd )
{
CConsole *con = CConsole::getInstance();
if( format == L"iiii" )
{
video::SColor color( params[3], params[0], params[1], params[2] );
con->printf( L"changed color to (red: %i, green: %i, blue: %i, alpha: %i)",
color.getRed(), color.getGreen(), color.getBlue(), color.getAlpha() );
con->setConsoleColor( color );
}
if( format == L"iii" )
{
video::SColor color( 255, params[0], params[1], params[2] );
con->printf( L"changed color to (red: %i, green: %i, blue: %i, alpha: %i)",
color.getRed(), color.getGreen(), color.getBlue(), color.getAlpha() );
con->setConsoleColor( color );
}
if( format == L"0" )
{
video::SColor color = con->getConsoleColor();
con->printf( L"current Color is (%i, %i, %i, %i )",
color.getRed(),
color.getGreen(),
color.getBlue(),
color.getAlpha() );
}
}
Code: Select all
CConsole *console = CConsole::getInstance();
console->regCmd( ConFn_Color, // function pointer
L"color", // name of the command
L"0\n" // syntax formats, one format per line,
"f(red)f(green)f(blue)f(alpha)\n" // 0 = without args
"f(red)f(green)f(blue)\n"
"i(red)i(green)i(blue)i(alpha)\n" // 4 args version with type int
// params named (used to build the desc)
"i(red)i(green)i(blue)", // 3 args version
L"changes the color of the console\n" // description text
"color is defined in the rgba combination\n "
"note: three parameter versions default alpha to the maximum value"
-------------
Next problem I got is, that Irrlicht apparently ignores the alpha color component when drawing fonts (with guifont) and drawing an image using draw2DImage leading to a black background of my console while it is moving out. Do I have to use materials for that purpose ?
Does anyone know how to fix this?
Thx in advance,
apriori