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Snake.cpp
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Snake.cpp
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#include <cstdlib>
#include <ctime>
#include "Snake.h"
#include "Field.h"
Snake::Snake()
{
m_status = Snake::LIVE;
m_maxSize = 20;
std::srand( std::time( NULL ) );
std::rand();
m_direction = static_cast<Snake::Direction>( std::rand() % 4 );
m_blocks.push_back( std::pair<int, int>( Field::WIDTH / 2,
Field::HEIGHT / 2 ) );
}
Snake::Status Snake::status() const
{
return m_status;
}
void Snake::tick( Field &field )
{
std::pair<int, int> p = m_blocks.front();
switch ( m_direction ) {
case Snake::LEFT:
--( p.first );
break;
case Snake::UP:
--( p.second );
break;
case Snake::RIGHT:
++( p.first );
break;
case Snake::DOWN:
++( p.second );
break;
}
if ( ( p.first < 0 ) || ( p.first >= Field::WIDTH ) ||
( p.second < 0) || ( p.second >= Field::HEIGHT ) ) {
m_status = Snake::DEAD;
return;
}
if ( field.block( p.first, p.second ) == Field::SNAKE_BLOCK ) {
m_status = Snake::DEAD;
return;
}
m_blocks.push_front( p );
if ( field.block( p.first, p.second ) != Field::FRUIT ) {
field.setBlock( Field::SNAKE_BLOCK, p.first, p.second );
std::pair<int, int> p = m_blocks.back();
field.setBlock( Field::EMPTY, p.first, p.second );
m_blocks.pop_back();
m_status = Snake::LIVE;
} else {
field.setBlock( Field::SNAKE_BLOCK, p.first, p.second );
field.newFruit();
m_status = Snake::INCREASED;
}
if ( m_blocks.size() == m_maxSize ) {
m_status = Snake::WIN;
return;
}
}
void Snake::keyEvent( Snake::Direction d )
{
if ( d == m_direction ) {
return;
}
switch ( d ) {
case Snake::LEFT:
if ( m_direction == Snake::RIGHT ) {
return;
}
break;
case Snake::UP:
if ( m_direction == Snake::DOWN ) {
return;
}
break;
case Snake::RIGHT:
if ( m_direction == Snake::LEFT ) {
return;
}
break;
case Snake::DOWN:
if ( m_direction == Snake::UP ) {
return;
}
break;
}
m_direction = d;
}
size_t Snake::maxSize() const
{
return m_maxSize;
}
size_t Snake::size() const
{
return m_blocks.size();
}