GDI/图象编程

开发平台：

Visual C++

ball.cpp：源码内容

							#include "ball.h"
ball::ball()
{
	m_fVelocidad = 0;
	m_Cancha = 0;
	m_cDirectionX = 1;
	m_cDirectionY = 1;
	srand( time(0) );
	m_brushBlanco	= (HBRUSH)GetStockObject(WHITE_BRUSH);
	//m_brushBlanco	= (HBRUSH)CreateSolidBrush(RGB(255,0,0));
	m_penBlanco	= CreatePen(PS_SOLID, 1, RGB(255, 255, 255));
}
ball::~ball()
{
	DeleteObject(m_brushBlanco);
	DeleteObject(m_penBlanco);
}
void ball::draw(HDC hDC)
{
	HBRUSH		hOldBrush;
	HPEN		hOldPen;
	hOldBrush	= (HBRUSH)SelectObject(hDC, m_brushBlanco);
	hOldPen		= (HPEN)SelectObject(hDC, m_penBlanco);
	Ellipse(hDC, getX() - getWidth()/2, getY() - getHeight()/2, getX() + getWidth()/2, getY() + getHeight()/2);
	SelectObject(hDC, hOldBrush);
	SelectObject(hDC, hOldPen);
}
void ball::move(float dt)
{
	mY += dt*m_fVelocidad*m_cDirectionY;
	mX += dt*m_fVelocidad*m_cDirectionX;
	if ( mY-mHeight/2 < m_Cancha->getMarginTop() )
	{
		mY = m_Cancha->getMarginTop() + mHeight/2;
		m_cDirectionY = -m_cDirectionY;
	}
	if ( mY+mHeight/2 > m_Cancha->getMarginBottom() )
	{
		mY = m_Cancha->getMarginBottom() - mHeight/2;
		m_cDirectionY = -m_cDirectionY;
	}
}
void ball::bounce()
{
	m_cDirectionX = -m_cDirectionX;
}
void ball::randomizeDirections()
{
	int r = 0;
	//randomizo eje x
	r = rand() % 2;
	if (r == 0) 
		m_cDirectionX = -1;
	else
		m_cDirectionX = 1;
	//randomizo eje y
	r = rand() % 2;
	if (r == 0) 
		m_cDirectionY = -1;
	else
		m_cDirectionY = 1;
}
void ball::setVelocidad(float valor)
{
	m_fVelocidad = valor;
}
void ball::setCancha(court* cancha)
{
	m_Cancha = cancha;
}
void ball::centrarEnCancha()
{
	setPosition(m_Cancha->getWidth()/2, m_Cancha->getHeight()/2);
}

						