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Snake: Try to only repaint the parts that actually changed between ticks.

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This commit is contained in:
Andreas Kling 2019-04-20 15:04:02 +02:00
parent 2d736d5591
commit 79573ce7e6
Notes: sideshowbarker 2024-07-19 14:38:32 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/79573ce7e66
2 changed files with 43 additions and 15 deletions
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55
Games/Snake/SnakeGame.cpp
View File

@ -7,6 +7,7 @@
SnakeGame::SnakeGame(GWidget* parent)
: GWidget(parent)
{
set_font(Font::default_bold_font());
m_fruit_bitmap = GraphicsBitmap::load_from_file("/res/icons/snake/paprika.png");
srand(time(nullptr));
reset();
@ -22,10 +23,12 @@ void SnakeGame::reset()
m_tail.clear_with_capacity();
m_length = 2;
m_score = 0;
m_score_text = "Score: 0";
m_velocity_queue.clear();
stop_timer();
start_timer(120);
spawn_fruit();
update();
}
bool SnakeGame::is_available(const Coordinate& coord)
@ -53,16 +56,28 @@ void SnakeGame::spawn_fruit()
m_fruit = coord;
}
Rect SnakeGame::score_rect() const
{
int score_width = font().width(m_score_text);
return { width() - score_width - 2, height() - font().glyph_height() - 2, score_width, font().glyph_height() };
}
void SnakeGame::timer_event(CTimerEvent&)
{
Vector<Coordinate> dirty_cells;
m_tail.prepend(m_head);
if (m_tail.size() > m_length)
if (m_tail.size() > m_length) {
dirty_cells.append(m_tail.last());
m_tail.take_last();
}
if (!m_velocity_queue.is_empty())
m_velocity = m_velocity_queue.dequeue();
dirty_cells.append(m_head);
m_head.row += m_velocity.vertical;
m_head.column += m_velocity.horizontal;
@ -77,6 +92,8 @@ void SnakeGame::timer_event(CTimerEvent&)
if (m_head.column < 0)
m_head.column = m_columns - 1;
dirty_cells.append(m_head);
for (int i = 0; i < m_tail.size(); ++i) {
if (m_head == m_tail[i]) {
game_over();
@ -87,9 +104,16 @@ void SnakeGame::timer_event(CTimerEvent&)
if (m_head == m_fruit) {
++m_length;
++m_score;
m_score_text = String::format("Score: %u", m_score);
update(score_rect());
dirty_cells.append(m_fruit);
spawn_fruit();
dirty_cells.append(m_fruit);
}
for (auto& coord : dirty_cells) {
update(cell_rect(coord));
}
update();
}
void SnakeGame::keydown_event(GKeyEvent& event)
@ -124,30 +148,31 @@ void SnakeGame::keydown_event(GKeyEvent& event)
}
}
Rect SnakeGame::cell_rect(const Coordinate& coord) const
{
auto game_rect = rect();
auto cell_size = Size(game_rect.width() / m_columns, game_rect.height() / m_rows);
return {
coord.column * cell_size.width(),
coord.row * cell_size.height(),
cell_size.width(),
cell_size.height()
};
}
void SnakeGame::paint_event(GPaintEvent& event)
{
GPainter painter(*this);
painter.add_clip_rect(event.rect());
painter.fill_rect(event.rect(), Color::Black);
auto game_rect = rect();
auto cell_size = Size(game_rect.width() / m_columns, game_rect.height() / m_rows);
auto cell_rect = [&] (const Coordinate& coord) -> Rect {
return {
coord.column * cell_size.width(),
coord.row * cell_size.height(),
cell_size.width(),
cell_size.height()
};
};
painter.fill_rect(cell_rect(m_head), Color::Yellow);
for (auto& coord : m_tail)
painter.fill_rect(cell_rect(coord), Color::from_rgb(0xaaaa00));
painter.draw_scaled_bitmap(cell_rect(m_fruit), *m_fruit_bitmap, m_fruit_bitmap->rect());
painter.draw_text(rect(), String::format("Score: %u", m_score), TextAlignment::TopLeft, Color::White);
painter.draw_text(score_rect(), m_score_text, TextAlignment::TopLeft, Color::White);
}
void SnakeGame::game_over()

3
Games/Snake/SnakeGame.h
View File

@ -35,6 +35,8 @@ private:
bool is_available(const Coordinate&);
void queue_velocity(int v, int h);
const Velocity& last_velocity() const;
Rect cell_rect(const Coordinate&) const;
Rect score_rect() const;
int m_rows { 20 };
int m_columns { 20 };
@ -51,6 +53,7 @@ private:
int m_length { 0 };
unsigned m_score { 0 };
String m_score_text;
RetainPtr<GraphicsBitmap> m_fruit_bitmap;
};