diff options
Diffstat (limited to 'demos/declarative/snake/content/snake.js')
| -rw-r--r-- | demos/declarative/snake/content/snake.js | 308 |
1 files changed, 308 insertions, 0 deletions
diff --git a/demos/declarative/snake/content/snake.js b/demos/declarative/snake/content/snake.js new file mode 100644 index 0000000..a65aebc --- /dev/null +++ b/demos/declarative/snake/content/snake.js @@ -0,0 +1,308 @@ + +var snake = new Array; +var board = new Array; +var links = new Array; +var scheduledDirections = new Array; +var numRows = 1; +var numColumns = 1; +var linkComponent = createComponent("content/Link.qml"); // XXX should resolve relative to script, not component +var cookieComponent = createComponent("content/Cookie.qml"); +var cookie; +var linksToGrow = 0; +var linksToDie = 0; +var waitForCookie = 0; +var growType = 0; +var skullMovementsBeforeDirectionChange = 0; + + +function rand(n) +{ + return (Math.floor(Math.random() * n)); +} + +function scheduleDirection(dir) +{ + direction = dir; + if(scheduledDirections[scheduledDirections.length-1]!=direction) + scheduledDirections.push(direction); +} + +function startNewGame() +{ + if (state == "starting") + return; + + if (heartbeat.running) { + endGame(); + startNewGameTimer.running = true; + return; + } + numRows = numRowsAvailable; + numColumns = numColumnsAvailable; + board = new Array(numRows * numColumns); + snake = new Array; + scheduledDirections = new Array; + growType = 0; + + skull.z = numRows * numColumns + 1; + + for (var i = 0; i < numRows * numColumns; ++i) { + if (i < links.length) { + var link = links[i]; + link.spawned = false; + link.dying = false; + } else { + if(linkComponent.isReady == false){ + if(linkComponent.isError == true) + print(linkComponent.errorString()); + else + print("Still loading linkComponent"); + continue;//TODO: Better error handling? + } + var link = linkComponent.createObject(); + link.parent = playfield; + link.z = numRows * numColumns + 1 - i; + link.type = i == 0 ? 2 : 0; + link.spawned = false; + link.dying = false; + links.push(link); + } + } + + head = links[0]; + snake.push(head); + head.row = numRows/2 -1; + head.column = numColumns/2 -1; + head.spawned = true; + + linksToGrow = 5; + linksToDie = 0; + waitForCookie = 5; + score = 0; + startHeartbeatTimer.running = true; + heartbeat.running = true; +} + +function endGame() +{ + heartbeat.running = false; + for(var i in snake) + snake[i].dying = true; + if (cookie) { + cookie.dying = true; + cookie = 0; + } + lastScore = score; + highScores.saveScore(lastScore); +} + +function move() { + + if (!head) + return; + + var dir = direction; + + if (scheduledDirections.length) { + dir = scheduledDirections.shift(); + } + + if (state == "starting") { + var turn = (dir - headDirection); + head.rotation += turn == -3 ? 1 : (turn == 3 ? -1 : turn ); + headDirection = dir; + return; + } + + var row = head.row; + var column = head.column; + + if (dir == 0) { + row = row - 1; + } else if (dir == 1) { + column = column + 1 + } else if (dir == 2) { + row = row + 1; + } else if (dir == 3) { + column = column - 1; + } + + //validate the new position + if (row < 0 || row >= numRows + || column < 0 || column >= numColumns + || (row == skull.row && column == skull.column) + || !isFree(row, column)) { + var turn = (dir - headDirection); + head.rotation += turn == -3 ? 1 : (turn == 3 ? -1 : turn ); + headDirection = dir; + endGame(); + return; + } + + var newLink; + if (linksToGrow > 0) { + --linksToGrow; + newLink = links[snake.length]; + newLink.spawned = false; + newLink.rotation = snake[snake.length-1].rotation; + newLink.type = growType; + newLink.dying = false; + snake.push(newLink); + } else { + var lastLink = snake[snake.length-1]; + board[lastLink.row * numColumns + lastLink.column] = Undefined; + } + + if (waitForCookie > 0) { + if (--waitForCookie == 0) + createCookie(cookie? (cookie.value+1) : 1); + } + + for (var i = snake.length-1; i > 0; --i) { + snake[i].row = snake[i-1].row; + snake[i].column = snake[i-1].column; + snake[i].rotation = snake[i-1].rotation; + } + + if (newLink) { + newLink.spawned = true; + } + + // move the head + head.row = row; + head.column = column; + board[row * numColumns + column] = head; + + var turn = (dir - headDirection); + head.rotation += turn == -3 ? 1 : (turn == 3 ? -1 : turn ); + headDirection = dir; + + var value = testCookie(row, column); + if (value > 0) { + linksToGrow += value; + score += value; + } +} + +function isFree(row, column) +{ + return board[row * numColumns + column] == Undefined; +} + +function isHead(row, column) +{ + return head.column == column && head.row == row; +} + +function testCookie(row, column) +{ + if (cookie && !cookie.dying && cookie.row == row && cookie.column == column) { + var value = cookie.value; + waitForCookie = value; + growType = snake[snake.length-1].type == 1 ? 0 : 1; + cookie.dying = true; + cookie.z = numRows * numColumns + 2; + return value; + } + return 0; +} + +function moveSkull() +{ + + if (linksToDie > 0) { + --linksToDie; + var link = snake.pop(); + link.dying = true; + board[link.row * numColumns + link.column] = Undefined; + if (score > 0) + --score; + if (snake.length == 0) { + endGame(); + return; + } + } + + var row = skull.row; + var column = skull.column; + if (isHead(row, column)) { + endGame(); + return; + } + row += skull.verticalMovement; + column += skull.horizontalMovement; + + var attempts = 4; + + while (skullMovementsBeforeDirectionChange == 0 || row < 0 || row >= numRows + || column < 0 || column >= numColumns + || (!isFree(row, column) && !isHead(row, column))) { + var d = rand(8); + skull.verticalMovement = 0; + skull.horizontalMovement = 0; + skullMovementsBeforeDirectionChange = rand(20)+1; + if (d == 0) { + skull.verticalMovement = -1 + } else if (d == 1) { + skull.horizontalMovement = -1; + } else if (d == 2) { + skull.verticalMovement = 1 + } else if (d == 3){ + skull.horizontalMovement = 1; + } else if (cookie) { + var rd = cookie.row - skull.row; + var rc = cookie.column - skull.column; + if (Math.abs(rd) > Math.abs(rc)) { + skull.verticalMovement = rd > 0 ? 1 : -1; + skullMovementsBeforeDirectionChange = Math.abs(rd); + } else { + skull.horizontalMovement= rc > 0 ? 1 : -1; + skullMovementsBeforeDirectionChange = Math.abs(rc); + } + } + row = skull.row + skull.verticalMovement; + column = skull.column + skull.horizontalMovement; + if (--attempts == 0) + return; + } + + skull.row = row; + skull.column = column; + --skullMovementsBeforeDirectionChange; + var value = testCookie(row, column); + if (value > 0) + linksToDie += value/2; + + if (isHead(row, column)) + endGame(); +} + +function createCookie(value) { + if (numRows * numColumns - snake.length < 10) + return; + + var column = rand(numColumns); + var row = rand(numRows); + while (!isFree(row, column)) { + column++; + if (column == numColumns) { + column = 0; + row++; + if (row == numRows) + row = 0; + } + } + + if(cookieComponent.isReady == false){ + if(cookieComponent.isError == true) + print(cookieComponent.errorString()); + else + print("Still loading cookieComponent"); + return;//TODO: Better error handling? + } + cookie = cookieComponent.createObject(); + cookie.parent = head.parent; + cookie.value = value; + cookie.row = row; + cookie.column = column; +} |