C++ USLuaState::GetTop方法代码示例

//----------------------------------------------------------------//
void USLuaRef::SetRef ( USLuaState& state, int idx, bool weak ) {

	this->Clear ();
	this->mWeak = weak;

	int top = state.GetTop ();

	if ( lua_isnil ( state, idx ) == false ) {

		USLuaRuntime& luaRuntime = USLuaRuntime::Get ();

		if ( weak ) {
			this->mRef = luaRuntime.mWeakRefTable.Ref ( state, idx );
		}
		else {
			this->mRef = luaRuntime.mStrongRefTable.Ref ( state, idx );	
		}
		
		this->mOwnsRef = true;
	}
	
	assert ( top == state.GetTop ());
}

/**	@name	setClearColor
	@text	At the start of each frame the device will by default automatically render a background color.  Using this function you can set the background color that is drawn each frame.  If you specify no arguments to this function, then automatic redraw of the background color will be turned off (i.e. the previous render will be used as the background).

	@opt	number red			The red value of the color.
	@opt	number green		The green value of the color.
	@opt	number blue			The blue value of the color.
	@opt	number alpha		The alpha value of the color.
	@out	nil
*/
int MOAISim::_setClearColor ( lua_State* L ) {

	USLuaState state ( L );
	MOAISim& sim = MOAISim::Get ();
	
	if ( state.GetTop () == 0 ) {
		sim.mClearFlags &= ~GL_COLOR_BUFFER_BIT;
	}
	else {
		float r = state.GetValue < float >( 1, 0.0f );
		float g = state.GetValue < float >( 2, 0.0f );
		float b = state.GetValue < float >( 3, 0.0f );
		float a = state.GetValue < float >( 4, 1.0f );
		
		sim.mClearColor = USColor::PackRGBA ( r, g, b, a );
		sim.mClearFlags |= GL_COLOR_BUFFER_BIT;
	}
	return 0;
}

SUPPRESS_EMPTY_FILE_WARNING
#if USE_CHIPMUNK

//================================================================//
// local
//================================================================//

//----------------------------------------------------------------//
/**	@name	areaForCircle
	@text	Returns the area for a ring or circle.
	
	@overload
	
		@in		number radius
		@out	number area

	@overload
	
		@in		number innerRadius
		@in		number outerRadius
		@out	number area
*/ 
int MOAICpShape::_areaForCircle ( lua_State* L ) {
	USLuaState state ( L );
	if ( !state.CheckParams ( 1, "N" )) return 0;

	cpFloat r1;
	cpFloat r2;

	if ( state.GetTop () >= 2 ) {
		r1 = state.GetValue < cpFloat >( 1, 0 );
		r2 = state.GetValue < cpFloat >( 2, 0 );
		
	}
	else {
		r1 = 0;
		r2 = state.GetValue < cpFloat >( 1, 0 );
	}

	lua_pushnumber ( L, cpAreaForCircle ( r1, r2 ));
	return 1;
}

//----------------------------------------------------------------//
void MOAIDraw::DrawLuaParams ( lua_State* L, u32 primType ) {

	MOAIGfxDevice& gfxDevice = MOAIGfxDevice::Get ();
	USLuaState state ( L );

	u32 total = state.GetTop () >> 1;
	
	gfxDevice.BeginPrim ( primType );
	
	for ( u32 i = 0; i < total; ++i ) {
		
		u32 idx = ( i << 1 ) + 1;
		
		float x = state.GetValue < float >( idx, 0.0f );
		float y = state.GetValue < float >( idx + 1, 0.0f );
		
		gfxDevice.WriteVtx ( x, y );
		gfxDevice.WritePenColor4b ();
	}
	
	gfxDevice.EndPrim ();
}