infotextfx.cpp

吃豆子游戏源码

/**
 *	File	:	InfoTextFX.cpp
 *  Author	:	Kevin Lynx
 *	Date	:	2007/8/3
 */
#include "stdafx.h"
#include "InfoTextFX.h"

const f32 DEFAULT_SPEED = 100.0f;

InfoTextFX::InfoTextFX()
{
	mDevice = 0;
	mTexture = 0;
}

InfoTextFX::~InfoTextFX()
{
}

void	InfoTextFX::init( IrrlichtDevice *device, ITexture *texture )
{
	mTexture = texture;
	mDevice = device;

	dimension2d<s32> imgSize = mTexture->getSize();
	mSrcRect.LowerRightCorner.X = imgSize.Width;
	mSrcRect.LowerRightCorner.Y = imgSize.Height;
	mSrcRect.UpperLeftCorner.X  = 0;
	mSrcRect.UpperLeftCorner.Y  = 0;

	dimension2d<s32> scrSize = mDevice->getVideoDriver()->getScreenSize();
	mCenterPos.X = scrSize.Width / 2;
	mCenterPos.Y = scrSize.Height / 2;

	mLeftX = (f32)mCenterPos.X;
	mUpY = (f32)mCenterPos.Y;
	mEndLeftX = (f32)scrSize.Width / 4;
	mSpeed = DEFAULT_SPEED;
}

void	InfoTextFX::reset()
{
	mLeftX = (f32)mCenterPos.X;
	mUpY = (f32)mCenterPos.Y;
}

bool	InfoTextFX::update( float dt )
{
	if( mLeftX > mEndLeftX )
	{
		float add = mSpeed * dt;
		mLeftX -= add;
		mUpY -= add * mSrcRect.LowerRightCorner.Y / mSrcRect.LowerRightCorner.X ;

		if( mLeftX <= mEndLeftX )
		{
			return true;
		}
	}
	else
	{
		return true;
	}

	return false;
}

void	InfoTextFX::render()
{
	rect<s32> destRect( (int)mLeftX, (int)mUpY, int( mCenterPos.X + mCenterPos.X - mLeftX ), 
		int( mCenterPos.Y + mCenterPos.Y - mUpY ) );

	mDevice->getVideoDriver()->draw2DImage( mTexture, destRect, mSrcRect, 0, 0, true ); 
}