237 lines
5.9 KiB
C++
237 lines
5.9 KiB
C++
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#include "food.h"
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#include "snake.h"
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#include <QGraphicsPixmapItem>
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Food::Food( const bool can_move )
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: image{ new QGraphicsPixmapItem( (can_move) ? this->img_rat : this->img_egg ) }
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, movable{ can_move }
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, x{ 0 }
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, y{ 0 }
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{
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}
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Food::Food( Food&& other ) noexcept
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: image{ other.image }
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, movable{ other.movable }
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, x{ other.x }
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, y{ other.y }
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{
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other.image = nullptr;
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}
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Food& Food::operator=( Food&& other ) noexcept
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{
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if ( this == &other ) return *this;
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this->x = other.x;
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this->y = other.y;
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this->movable = other.movable;
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this->image = other.image;
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other.image = nullptr;
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return *this;
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}
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unsigned Food::X() const noexcept
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{
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return this->x;
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}
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unsigned Food::Y() const noexcept
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{
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return this->y;
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}
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QGraphicsPixmapItem* Food::getImageItem() const noexcept
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{
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return this->image;
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}
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bool Food::inTile( const unsigned x, const unsigned y ) const noexcept
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{
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return this->x == x && this->y == y;
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}
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void Food::update( const unsigned new_x, const unsigned new_y ) noexcept
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{
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this->x = new_x;
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this->y = new_y;
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this->image->setOffset( 16+(new_x*32), 16+(new_y*32) );
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}
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void Food::spawn( const Snake& snake, const Snake& snake_ ) noexcept
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{
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// pick a new random position
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unsigned new_x, new_y;
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while (true) {
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new_x = static_cast<unsigned>( rand()%16 );
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new_y = static_cast<unsigned>( rand()%16 );
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// check it's actually inside the field
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if ( new_x < 16u && new_y < 16u ) {
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// check the tile is empty
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if ( new_x != this->x && new_y != this->y ) {
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if ( !(snake.inTile( new_x, new_y, false ) || snake_.inTile( new_x, new_y, false )) ) {
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break;
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}
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}
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}
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}
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// update to new position
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this->update( new_x, new_y );
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// randomly rotate the image
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int rand_{ rand()%4 };
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switch (rand_) {
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case 1:
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this->image->setPixmap(
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this->image->pixmap().transformed(
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QTransform().rotate( 90.0 ) ) );
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break;
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case 2:
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this->image->setPixmap(
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this->image->pixmap().transformed(
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QTransform().rotate( 180.0 ) ) );
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break;
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case 3:
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this->image->setPixmap(
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this->image->pixmap().transformed(
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QTransform().rotate( -90.0 ) ) );
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break;
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default:
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// do not rotate
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break;
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}
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}
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void Food::move( const Snake& snake )
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{
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int move_up { 0 },
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move_down { 0 },
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move_left { 0 },
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move_right { 0 };
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const unsigned
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snake_x{ snake.front().x },
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snake_y{ snake.front().y };
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// check the field's limits
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if ( this->y == 0u ) {
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move_up -= 100;
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} else if ( this->y == 15u ) {
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move_down -= 100;
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}
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if ( this->x == 0u ) {
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move_left -= 100;
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} else if ( this->x == 15u ) {
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move_right -= 100;
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}
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// check the snake
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if ( ! snake.inTile( this->x, this->y-1u, false ) ) {
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move_up += 100;
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} else {
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move_up -= 100;
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}
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if ( ! snake.inTile( this->x, this->y+1u, false ) ) {
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move_down += 100;
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} else {
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move_down -= 100;
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}
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if ( ! snake.inTile( this->x-1u, this->y, false ) ) {
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move_left += 100;
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} else {
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move_left -= 100;
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}
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if ( ! snake.inTile( this->x+1u, this->y, false ) ) {
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move_right += 100;
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} else {
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move_right -= 100;
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}
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// check the snake position
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if ( this->x == snake_x ) {
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move_left += 30;
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move_right += 30;
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if ( this->y < snake_y ) {
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move_up += 30;
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} else if ( this->y > snake_y ) {
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move_down += 30;
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}
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} else if ( this->x < snake_x ) {
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move_left += 30;
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if ( this->y < snake_y ) {
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move_up += 30;
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} else if ( this->y > snake_y ) {
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move_down += 30;
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} else /*if ( this->y == snake_y )*/ {
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move_up += 30;
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move_down += 30;
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}
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} else /*if ( this->x > snake_x )*/ {
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move_right += 30;
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if ( this->y < snake_y ) {
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move_up += 30;
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} else if ( this->y > snake_y ) {
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move_down += 30;
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} else /*if ( this->y == snake_y )*/ {
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move_up += 30;
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move_down += 30;
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}
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}
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// decide
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int max{ -1000 };
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Direction choice;
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if ( move_up > max || (move_up == max && rand()%2) ) {
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max = move_up;
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choice = Direction::UP;
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}
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if ( move_down > max || (move_down == max && rand()%2) ) {
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max = move_down;
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choice = Direction::DOWN;
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}
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if ( move_left > max || (move_left == max && rand()%2) ) {
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max = move_left;
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choice = Direction::LEFT;
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}
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if ( move_right > max || (move_right == max && rand()%2) ) {
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choice = Direction::RIGHT;
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}
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// apply the move
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switch ( choice ) {
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case Direction::UP:
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this->update( this->x, this->y-1u );
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this->image->setPixmap(
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this->img_rat );
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break;
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case Direction::DOWN:
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this->update( this->x, this->y+1u );
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this->image->setPixmap(
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this->img_rat.transformed(
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QTransform().rotate( 180.0 ) ) );
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break;
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case Direction::LEFT:
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this->update( this->x-1u, this->y );
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this->image->setPixmap(
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this->img_rat.transformed(
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QTransform().rotate( -90.0 ) ) );
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break;
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case Direction::RIGHT:
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this->update( this->x+1u, this->y );
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this->image->setPixmap(
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this->img_rat.transformed(
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QTransform().rotate( 90.0 ) ) );
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break;
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default:
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// should be unreachable
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throw("Unexpected choice direction: "+std::to_string(choice));
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}
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}
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