diff --git a/data/sound/beep.ogg b/data/sound/beep.ogg
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diff --git a/data/sound/nom.ogg b/data/sound/nom.ogg
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diff --git a/data/sprite/apple.png b/data/sprite/apple.png
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diff --git a/data/sprite/breadball.png b/data/sprite/breadball.png
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diff --git a/data/sprite/bricks.png b/data/sprite/bricks.png
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diff --git a/data/sprite/snake/bend.png b/data/sprite/snake/bend.png
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diff --git a/data/sprite/snake/body.png b/data/sprite/snake/body.png
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diff --git a/data/sprite/snake/head.png b/data/sprite/snake/head.png
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diff --git a/data/sprite/snake/tail.png b/data/sprite/snake/tail.png
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diff --git a/snake.c b/snake.c
new file mode 100644
index 0000000..7df970d
--- /dev/null
+++ b/snake.c
@@ -0,0 +1,362 @@
+
+#include <helianthus.h>
+
+#define SIZE 32
+#define WIDTH 16
+#define HEIGHT 16
+#define MAXLEN (WIDTH*HEIGHT+1)
+#define MAXFOOD 5
+#define FRAMERATE 24
+
+
+enum TileType {
+ NONE,
+ WALL,
+ FOOD,
+ SNAKE
+};
+
+enum GameMode {
+ MENU,
+ START,
+ PLAY,
+ GAMEOVER
+};
+
+
+int grid[WIDTH][HEIGHT];
+Sprite sprites[WIDTH][HEIGHT];
+Group gridGroup, storage;
+
+Sound nom, cut;
+
+int snake[MAXLEN][2];
+int len;
+int foodCount;
+int dx, dy;
+int framesRemain;
+
+int optStop;
+int optCut;
+double optWalls;
+int optStepFrames;
+
+int difficulty;
+
+int mode;
+
+char *tileWall = "data/sprite/bricks.png";
+char *tileFood = "data/sprite/apple.png";
+char *tileHead = "data/sprite/snake/head.png";
+char *tileBody = "data/sprite/snake/body.png";
+char *tileBend = "data/sprite/snake/bend.png";
+char *tileTail = "data/sprite/snake/tail.png";
+
+
+void putFood() {
+ for(int i = 0; i < 100 && foodCount < MAXFOOD; ++i) {
+ int x = randomNumber(0, WIDTH-1);
+ int y = randomNumber(0, HEIGHT-1);
+ if (grid[x][y] == NONE) {
+ grid[x][y] = FOOD;
+ spriteSetAnimation(sprites[x][y], tileFood);
+ ++foodCount;
+ }
+ }
+}
+
+
+void setSnakeTile(int i) {
+ int x = snake[i][0];
+ int y = snake[i][1];
+ Sprite s = sprites[x][y];
+ char *tile = tileBody;
+ double rotation = 0;
+
+ int left = FALSE;
+ int right = FALSE;
+ int top = FALSE;
+ int bottom = FALSE;
+ if (i > 0) {
+ left = left || snake[i-1][0] < x;
+ right = right || snake[i-1][0] > x;
+ top = top || snake[i-1][1] < y;
+ bottom = bottom || snake[i-1][1] > y;
+ }
+ if (i < len-1) {
+ left = left || snake[i+1][0] < x;
+ right = right || snake[i+1][0] > x;
+ top = top || snake[i+1][1] < y;
+ bottom = bottom || snake[i+1][1] > y;
+ }
+
+ if (i == 0) {
+ tile = tileHead;
+ if (top) rotation = 90;
+ if (bottom) rotation = -90;
+ if (right) rotation = 180;
+ } else
+ if (i == len-1) {
+ tile = tileTail;
+ if (top) rotation = -90;
+ if (bottom) rotation = 90;
+ if (left) rotation = 180;
+ } else
+ if (left && top) {
+ tile = tileBend;
+ rotation = 180;
+ } else
+ if (left && bottom) {
+ tile = tileBend;
+ rotation = 90;
+ } else
+ if (right && top) {
+ tile = tileBend;
+ rotation = -90;
+ } else
+ if (right && bottom) {
+ tile = tileBend;
+ rotation = 0;
+ } else
+ if (top) {
+ rotation = 90;
+ }
+
+ spriteSetAnimation(s, tile);
+ spriteSetRotation(s, rotation);
+}
+
+
+void resetTile(int x, int y) {
+ grid[x][y] = NONE;
+ Sprite s = sprites[x][y];
+ spriteSetNoAnimation(s);
+ spriteSetRotation(s, 0);
+}
+
+
+void moveSnake() {
+ int x = snake[0][0] + dx;
+ int y = snake[0][1] + dy;
+ int cell = grid[x][y];
+
+ if (cell == WALL) {
+ if (!optStop) mode = GAMEOVER;
+ dx = snake[0][0] - snake[1][0];
+ dy = snake[0][1] - snake[1][1];
+ return;
+ }
+
+ if (cell == SNAKE) {
+ if (!optCut) { mode = GAMEOVER; return; }
+ int prevLen = len;
+ for(int i = 0; i < len; ++i)
+ if (snake[i][0] == x && snake[i][1] == y)
+ { len=i; setSnakeTile(len-1); break; }
+ for(int i = len; i < prevLen; ++i)
+ resetTile(snake[i][0], snake[i][1]);
+ soundPlay(cut, FALSE);
+ }
+
+ if (cell != NONE && cell != FOOD && cell != SNAKE)
+ { mode = GAMEOVER; return; }
+
+ for(int i = len; i > 0; --i) {
+ snake[i][0] = snake[i-1][0];
+ snake[i][1] = snake[i-1][1];
+ }
+ snake[0][0] = x;
+ snake[0][1] = y;
+
+ if (cell == FOOD || cell == SNAKE) {
+ grid[x][y] = SNAKE;
+ ++len;
+ setSnakeTile(0);
+ setSnakeTile(1);
+ } else {
+ grid[x][y] = SNAKE;
+ setSnakeTile(0);
+ setSnakeTile(1);
+ setSnakeTile(len-1);
+ resetTile(snake[len][0], snake[len][1]);
+ }
+
+ if (cell == FOOD) {
+ --foodCount;
+ soundPlay(nom, FALSE);
+ putFood();
+ }
+}
+
+
+void restart() {
+ optStepFrames = 12;
+ optWalls = 0;
+ optCut = TRUE;
+ optStop = TRUE;
+ switch(difficulty) {
+ case 2:
+ optStepFrames = 12;
+ optWalls = 0.01;
+ break;
+ case 3:
+ optStepFrames = 10;
+ optWalls = 0.02;
+ optCut = FALSE;
+ break;
+ case 4:
+ optStepFrames = 8;
+ optWalls = 0.04;
+ optCut = FALSE;
+ optStop = FALSE;
+ break;
+ case 5:
+ optStepFrames = 6;
+ optWalls = 0.06;
+ optCut = FALSE;
+ optStop = FALSE;
+ break;
+ };
+
+
+ for(int x = 0; x < WIDTH; ++x) {
+ for(int y = 0; y < HEIGHT; ++y) {
+ grid[x][y] = NONE;
+ Sprite s = sprites[x][y];
+ spriteSetRotation(s, 0);
+ spriteSetNoAnimation(s);
+ if ( x == 0 || y == 0
+ || x == WIDTH-1 || y == HEIGHT-1
+ || randomFloat() < optWalls )
+ {
+ grid[x][y] = WALL;
+ spriteSetAnimation(s, tileWall);
+ }
+ }
+ }
+
+ len = 2;
+ snake[0][0] = WIDTH/2;
+ snake[0][1] = HEIGHT/2;
+ snake[1][0] = snake[0][0] - 1;
+ snake[1][1] = snake[0][1];
+ for(int i = 0; i < len; ++i)
+ grid[ snake[i][0] ][ snake[i][1] ] = SNAKE;
+ for(int i = 0; i < len; ++i)
+ setSnakeTile(i);
+
+ dx = 1;
+ dy = 0;
+
+ foodCount = 0;
+ putFood();
+
+ framesRemain = optStepFrames;
+ mode = START;
+}
+
+
+void init() {
+ worldSetWidth(SIZE * WIDTH);
+ worldSetHeight(SIZE * HEIGHT);
+ worldSetFrameRate(FRAMERATE);
+
+ storage = createGroup();
+ char *tiles[6] = { tileWall, tileFood, tileHead, tileBody, tileBend, tileTail };
+ for(int i = 0; i < 6; ++i) {
+ Sprite s = createSprite(0, 0);
+ spriteSetAnimation(s, tiles[i]);
+ groupAdd(storage, s);
+ }
+ groupSetVisibleEach(storage, FALSE);
+
+ gridGroup = createGroup();
+ for(int x = 0; x < WIDTH; ++x) {
+ for(int y = 0; y < HEIGHT; ++y) {
+ Sprite s = createSpriteEx((x + 0.5)*SIZE, (y + 0.5)*SIZE, SIZE, SIZE);
+ spriteSetShapeColor(s, "transparent");
+ groupAdd(gridGroup, s);
+ sprites[x][y] = s;
+ }
+ }
+
+ nom = createSound("data/sound/beep.ogg");
+ cut = createSound("data/sound/nom.ogg");
+
+ mode = MENU;
+}
+
+
+void draw() {
+ double cx = worldGetWidth()/2.0;
+ double cy = worldGetHeight()/2.0;
+
+ if (mode == PLAY) {
+ int prevdx = snake[0][0] - snake[1][0];
+ int prevdy = snake[0][1] - snake[1][1];
+
+ if (keyWentDown("left") && (prevdx != 1 || prevdy != 0)) { dx = -1; dy = 0; framesRemain = 0; }
+ else if (keyWentDown("right") && (prevdx != -1 || prevdy != 0)) { dx = 1; dy = 0; framesRemain = 0; }
+ else if (keyWentDown("up") && (prevdx != 0 || prevdy != 1)) { dx = 0; dy = -1; framesRemain = 0; }
+ else if (keyWentDown("down") && (prevdx != 0 || prevdy != -1)) { dx = 0; dy = 1; framesRemain = 0; }
+ if (--framesRemain <= 0) {
+ moveSnake();
+ framesRemain = optStepFrames;
+ }
+ drawSprites();
+ if (keyWentDown("escape")) mode = MENU;
+ } else
+ if (mode == GAMEOVER) {
+ drawSprites();
+
+ fill(rgba(1, 1, 1, 0.25));
+ rect(0, 0, worldGetWidth(), worldGetHeight());
+
+ textAlign(HALIGN_CENTER, HALIGN_CENTER);
+ textSize(24);
+ text("Game Over", cx, cy);
+ textSize(12);
+ text("press enter", cx, cy + 24);
+ if (keyWentDown("return")) mode = MENU;
+ if (keyWentDown("escape")) mode = MENU;
+ } else
+ if (mode == START) {
+ drawSprites();
+
+ fill(rgba(1, 1, 1, 0.25));
+ rect(0, 0, worldGetWidth(), worldGetHeight());
+
+ textAlign(HALIGN_CENTER, VALIGN_CENTER);
+ textSize(24);
+ text("Press enter to start", cx, cy);
+ if (keyWentDown("return")) mode = PLAY;
+ if (keyWentDown("escape")) mode = MENU;
+ } else
+ if (mode == MENU) {
+ textAlign(HALIGN_LEFT, VALIGN_CENTER);
+ textSize(24);
+ int x = cx - 100;
+ int y = cy - 24*3;
+ text("Select difficulty level:", x, y); y += 24;
+ text("1 - very easy", x, y); y += 24;
+ text("2 - easy", x, y); y += 24;
+ text("3 - medium", x, y); y += 24;
+ text("4 - hard", x, y); y += 24;
+ text("5 - very hard", x, y); y += 24;
+ difficulty = 0;
+ if (keyWentDown("1")) difficulty = 1;
+ if (keyWentDown("2")) difficulty = 2;
+ if (keyWentDown("3")) difficulty = 3;
+ if (keyWentDown("4")) difficulty = 4;
+ if (keyWentDown("5")) difficulty = 5;
+ if (difficulty) restart();
+ if (keyWentDown("escape")) worldStop();
+ }
+}
+
+int main() {
+ worldSetInit(&init);
+ worldSetDraw(&draw);
+ worldRun();
+ return 0;
+}