Snake Game
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Sterling Archer committed
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#include "SnakeActivity.h"
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#include <GfxRenderer.h>
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#include "MappedInputManager.h"
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#include "fontIds.h"
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void SnakeActivity::onEnter() {
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Activity::onEnter();
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screenW_ = renderer.getScreenWidth();
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screenH_ = renderer.getScreenHeight();
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randomSeed(millis());
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resetGame();
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renderPending_ = true;
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requestUpdate();
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}
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void SnakeActivity::onExit() {
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Activity::onExit();
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}
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void SnakeActivity::resetGame() {
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cols_ = screenW_ / BLOCK;
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rows_ = (screenH_ - HEADER_H - FOOTER_H) / BLOCK;
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if (cols_ < 5) cols_ = 5;
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if (rows_ < 5) rows_ = 5;
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if ((long)cols_ * (long)rows_ > MAX_SNAKE_LEN) {
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rows_ = MAX_SNAKE_LEN / cols_;
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}
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fieldLeft_ = (screenW_ - cols_ * BLOCK) / 2;
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if (fieldLeft_ < 0) fieldLeft_ = 0;
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int freeVertical = screenH_ - HEADER_H - FOOTER_H - rows_ * BLOCK;
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fieldTop_ = HEADER_H + (freeVertical > 0 ? freeVertical / 2 : 0);
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int cx = cols_ / 2;
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int cy = rows_ / 2;
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headIdx_ = 0;
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length_ = 3;
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snakeX_[0] = cx; snakeY_[0] = cy;
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snakeX_[1] = cx - 1; snakeY_[1] = cy;
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snakeX_[2] = cx - 2; snakeY_[2] = cy;
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dir_ = Dir::Right;
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pendingDir_ = Dir::Right;
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score_ = 0;
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tickInterval_ = TICK_START_MS;
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gameOver_ = false;
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won_ = false;
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lastMove_ = millis();
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placeFood();
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}
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bool SnakeActivity::isSnakeCell(int x, int y) const {
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for (int i = 0; i < length_; i++) {
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int idx = (headIdx_ + i) % MAX_SNAKE_LEN;
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if (snakeX_[idx] == x && snakeY_[idx] == y) return true;
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}
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return false;
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}
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void SnakeActivity::placeFood() {
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if (length_ >= cols_ * rows_) return;
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int fx, fy;
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do {
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fx = random(0, cols_);
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fy = random(0, rows_);
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} while (isSnakeCell(fx, fy));
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foodX_ = fx;
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foodY_ = fy;
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}
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void SnakeActivity::handleDirectionInput() {
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const int btn = mappedInput.getPressedFrontButton();
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switch (btn) {
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case HalGPIO::BTN_BACK:
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if (dir_ != Dir::Right) pendingDir_ = Dir::Left;
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break;
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case HalGPIO::BTN_CONFIRM:
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if (dir_ != Dir::Left) pendingDir_ = Dir::Right;
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break;
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case HalGPIO::BTN_LEFT:
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if (dir_ != Dir::Down) pendingDir_ = Dir::Up;
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break;
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case HalGPIO::BTN_RIGHT:
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if (dir_ != Dir::Up) pendingDir_ = Dir::Down;
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break;
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default:
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break;
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}
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}
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void SnakeActivity::updateGame() {
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dir_ = pendingDir_;
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int dx = 0, dy = 0;
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switch (dir_) {
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case Dir::Up: dy = -1; break;
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case Dir::Down: dy = 1; break;
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case Dir::Left: dx = -1; break;
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case Dir::Right: dx = 1; break;
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}
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int newX = snakeX_[headIdx_] + dx;
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int newY = snakeY_[headIdx_] + dy;
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if (newX < 0 || newX >= cols_ || newY < 0 || newY >= rows_) {
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gameOver_ = true;
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return;
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}
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bool willEat = (newX == foodX_ && newY == foodY_);
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for (int i = 0; i < length_; i++) {
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if (!willEat && i == length_ - 1) continue;
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int idx = (headIdx_ + i) % MAX_SNAKE_LEN;
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if (snakeX_[idx] == newX && snakeY_[idx] == newY) {
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gameOver_ = true;
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return;
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}
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}
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headIdx_ = (headIdx_ - 1 + MAX_SNAKE_LEN) % MAX_SNAKE_LEN;
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snakeX_[headIdx_] = newX;
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snakeY_[headIdx_] = newY;
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if (willEat) {
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if (length_ < MAX_SNAKE_LEN) length_++;
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score_ += POINTS_PER_FOOD;
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if (length_ >= cols_ * rows_) {
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gameOver_ = true;
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won_ = true;
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return;
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}
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if (score_ % SPEEDUP_EVERY_POINTS == 0 && tickInterval_ > TICK_MIN_MS) {
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tickInterval_ -= TICK_STEP_MS;
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if (tickInterval_ < TICK_MIN_MS) tickInterval_ = TICK_MIN_MS;
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}
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placeFood();
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}
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}
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void SnakeActivity::loop() {
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if (mappedInput.wasPressed(MappedInputManager::Button::Power)) {
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while (mappedInput.isPressed(MappedInputManager::Button::Power)) {
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mappedInput.update();
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delay(10);
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}
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finish();
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return;
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}
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if (gameOver_) {
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if (mappedInput.getPressedFrontButton() != -1) {
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resetGame();
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renderPending_ = true;
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requestUpdate();
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}
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return;
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}
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handleDirectionInput();
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unsigned long now = millis();
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if (now - lastMove_ >= tickInterval_) {
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lastMove_ = now;
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updateGame();
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renderPending_ = true;
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}
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if (renderPending_) {
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requestUpdate();
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}
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}
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void SnakeActivity::drawFooterLabels() const {
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static const char* labels[4] = {"Left", "Right", "Up", "Down"};
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int footerTop = screenH_ - FOOTER_H;
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renderer.drawLine(0, footerTop, screenW_, footerTop);
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int colW = screenW_ / 4;
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int textH = renderer.getTextHeight(SMALL_FONT_ID);
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int labelY = footerTop + (FOOTER_H - textH) / 2;
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for (int i = 0; i < 4; i++) {
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int w = renderer.getTextWidth(SMALL_FONT_ID, labels[i]);
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int colCenterX = i * colW + colW / 2;
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renderer.drawText(SMALL_FONT_ID, colCenterX - w / 2, labelY, labels[i], true);
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if (i > 0) {
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renderer.drawLine(i * colW, footerTop, i * colW, screenH_);
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}
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}
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}
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void SnakeActivity::render(RenderLock&&) {
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renderPending_ = false;
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renderer.clearScreen();
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char scoreStr[24];
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snprintf(scoreStr, sizeof(scoreStr), "Score: %d", score_);
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renderer.drawText(UI_10_FONT_ID, 12, 10, scoreStr, true);
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int fieldW = cols_ * BLOCK;
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int fieldH = rows_ * BLOCK;
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renderer.drawLine(fieldLeft_, fieldTop_, fieldLeft_ + fieldW, fieldTop_);
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renderer.drawLine(fieldLeft_, fieldTop_ + fieldH, fieldLeft_ + fieldW, fieldTop_ + fieldH);
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renderer.drawLine(fieldLeft_, fieldTop_, fieldLeft_, fieldTop_ + fieldH);
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renderer.drawLine(fieldLeft_ + fieldW, fieldTop_, fieldLeft_ + fieldW, fieldTop_ + fieldH);
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for (int i = 0; i < length_; i++) {
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int idx = (headIdx_ + i) % MAX_SNAKE_LEN;
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int x = fieldLeft_ + snakeX_[idx] * BLOCK;
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int y = fieldTop_ + snakeY_[idx] * BLOCK;
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renderer.fillRect(x + 1, y + 1, BLOCK - 2, BLOCK - 2, true);
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if (i == 0) {
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int innerSize = BLOCK / 3;
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renderer.fillRect(x + (BLOCK - innerSize) / 2, y + (BLOCK - innerSize) / 2,
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innerSize, innerSize, false);
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}
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}
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int fx = fieldLeft_ + foodX_ * BLOCK;
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int fy = fieldTop_ + foodY_ * BLOCK;
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renderer.fillRect(fx + 1, fy + 1, BLOCK - 2, BLOCK - 2, true);
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renderer.fillRect(fx + 4, fy + 4, BLOCK - 8, BLOCK - 8, false);
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drawFooterLabels();
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if (gameOver_) {
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char line2[24];
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snprintf(line2, sizeof(line2), "Score: %d", score_);
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int baseY = fieldTop_ + fieldH / 2 - 40;
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renderer.drawCenteredText(UI_12_FONT_ID, baseY, won_ ? "YOU WIN!" : "GAME OVER",
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true, EpdFontFamily::BOLD);
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renderer.drawCenteredText(UI_10_FONT_ID, baseY + 30, line2);
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renderer.drawCenteredText(UI_10_FONT_ID, baseY + 56, "Any button to Restart");
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renderer.drawCenteredText(UI_10_FONT_ID, baseY + 78, "Power button to Exit");
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}
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renderer.displayBuffer();
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}
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