121 lines
2.9 KiB
Plaintext
121 lines
2.9 KiB
Plaintext
// main.js
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var draw = use('draw2d')
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var render = use('render')
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var graphics = use('graphics')
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var input = use('input')
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var config = use('config')
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var color = use('color')
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var random = use('random')
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prosperon.camera.transform.pos = [0,0]
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var cellSize = 20
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var gridW = floor(config.width / cellSize)
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var gridH = floor(config.height / cellSize)
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var snake, direction, nextDirection, apple
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var moveInterval = 0.1
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var moveTimer = 0
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var gameState = "playing"
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function resetGame() {
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var cx = floor(gridW / 2)
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var cy = floor(gridH / 2)
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snake = [
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{x: cx, y: cy},
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{x: cx-1, y: cy},
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{x: cx-2, y: cy}
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]
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direction = {x:1, y:0}
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nextDirection = {x:1, y:0}
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spawnApple()
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gameState = "playing"
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moveTimer = 0
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}
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function spawnApple() {
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apple = {x:floor(random.random()*gridW), y:floor(random.random()*gridH)}
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// Re-spawn if apple lands on snake
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for (var i=0; i<snake.length; i++)
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if (snake[i].x == apple.x && snake[i].y == apple.y) { spawnApple(); return }
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}
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function wrap(pos) {
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if (pos.x < 0) pos.x = gridW - 1
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if (pos.x >= gridW) pos.x = 0
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if (pos.y < 0) pos.y = gridH - 1
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if (pos.y >= gridH) pos.y = 0
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}
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resetGame()
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this.update = function(dt) {
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if (gameState != "playing") return
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moveTimer += dt
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if (moveTimer < moveInterval) return
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moveTimer -= moveInterval
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// Update direction
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direction = {x: nextDirection.x, y: nextDirection.y}
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// New head
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var head = {x: snake[0].x + direction.x, y: snake[0].y + direction.y}
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wrap(head)
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// Check collision with body
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for (var i=0; i<snake.length; i++) {
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if (snake[i].x == head.x && snake[i].y == head.y) {
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gameState = "gameover"
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return
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}
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}
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// Place head
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snake.unshift(head)
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// Eat apple?
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if (head.x == apple.x && head.y == apple.y) spawnApple()
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else snake.pop()
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}
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this.hud = function() {
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// Optional clear screen
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draw.rectangle({x:0, y:0, width:config.width, height:config.height}, [0,0,0,1])
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// Draw snake
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for (var i=0; i<snake.length; i++) {
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var s = snake[i]
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draw.rectangle({x:s.x*cellSize, y:s.y*cellSize, width:cellSize, height:cellSize}, color.green)
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}
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// Draw apple
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draw.rectangle({x:apple.x*cellSize, y:apple.y*cellSize, width:cellSize, height:cellSize}, color.red)
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if (gameState == "gameover") {
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var msg = "GAME OVER! Press SPACE to restart."
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draw.text(msg, {x:0, y:config.height*0.5-10, width:config.width, height:20}, null, 0, color.white)
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}
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}
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// No immediate reversal
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// "Up" means y=1, so going physically up on screen
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this.inputs = {
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up: function() {
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if (direction.y != -1) nextDirection = {x:0,y:1}
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},
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down: function() {
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if (direction.y != 1) nextDirection = {x:0,y:-1}
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},
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left: function() {
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if (direction.x != 1) nextDirection = {x:-1,y:0}
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},
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right: function() {
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if (direction.x != -1) nextDirection = {x:1,y:0}
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},
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space: function() {
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if (gameState=="gameover") resetGame()
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}
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}
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input.player[0].control(this)
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