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DefeatMe

forked:52
favorite:27
lines : 195
license : MIT License
modified : 2009-03-15 17:52:09

// DefeatMe.as
//  Defeat black ships.
//  (To restart from stage 1, reload the page.)
//  <Operation>
//   Movement     : Arrow or [WASD] keys.
//   Fire / Start : [Z], [X], [.] or [/] key.
package {
    import flash.display.Sprite;
    [SWF(width="465", height="465", backgroundColor="0xdddddd", frameRate="30")]
    public class DefeatMe extends Sprite {
        public function DefeatMe() { main = this; initialize(); }
    }
}
import flash.display.*;
import flash.geom.*;
import flash.text.*;
import flash.events.*;
const SCREEN_WIDTH:int = 465, SCREEN_HEIGHT:int = 465;
var main:Sprite, g:Graphics;
var messageField:TextField = new TextField;
var keys:Vector.<Boolean> = new Vector.<Boolean>(256);
// Initialize UIs.
function initialize():void {
    g = main.graphics;
    main.stage.addEventListener(KeyboardEvent.KEY_DOWN, function(e:KeyboardEvent):void { keys[e.keyCode] = true; } );
    main.stage.addEventListener(KeyboardEvent.KEY_UP,   function(e:KeyboardEvent):void { keys[e.keyCode] = false; } );
    messageField = createTextField(SCREEN_WIDTH - 360, SCREEN_HEIGHT - 20, 360, 20, 0);
    main.addChild(messageField);
    goToNextStage(); ships[1].exists = false;
    startGameOver(); gameOverTicks = 1;
    main.addEventListener(Event.ENTER_FRAME, update);
}
// Update the game frame.
function update(event:Event):void {
    g.clear(); g.lineStyle(5, 0, 0.8);
    var isStageOver:Boolean = true;
    for each (var s:Ship in ships) {
        s.update();
        if (!s.isPlayer && s.exists) isStageOver = false;
    }
    for (var i:int = 0; i < shots.length; i++) if (!shots[i].update()) { shots.splice(i, 1); i--; }
    if (isInGame) {
        if (isStageOver) goToNextStage();
    } else {
        if (gameOverTicks > 0) {
            gameOverTicks--; messageField.y = SCREEN_HEIGHT - 20 + gameOverTicks;
        } else if (isFirePressed()) {
            isInGame = true; resetStage();
        }
    }
}
var firePressedFlag:Boolean;
function isFirePressed():Boolean {
    if (keys[0x5a] || keys[0xbf] || keys[0x58] || keys[0xbe]) {
        if (!firePressedFlag) {
            firePressedFlag = true;
            return true;
        }
    } else {
        firePressedFlag = false;
    }
    return false;
}
// Ships.
var ships:Vector.<Ship> = new Vector.<Ship>;
class Ship {
    public var pos:Vector3D;
    public var isPlayer:Boolean;
    public var posRecord:Vector.<Vector3D>;
    public var fireRecord:Vector.<Boolean>;
    public var recordIndex:int = 0;
    public var exists:Boolean = true;
    public var speed:Number = 5, shotSpeed:Number = 10;
    public var fireWay:int = 1, fireWayAngle:Number = PI / 5;
    public function update():void {
        if (!exists) return;
        if (isPlayer) { updatePlayer(); return; }
        pos = posRecord[recordIndex];
        if (fireRecord[recordIndex]) addShot(pos, shotSpeed, fireWay, fireWayAngle, false);
        recordIndex++; if (recordIndex >= fireRecord.length) recordIndex = 0;
        g.moveTo(pos.x, pos.y + 10);
        g.lineTo(pos.x - 7, pos.y - 4);
        g.lineTo(pos.x + 7, pos.y - 4);
        g.lineTo(pos.x, pos.y + 10);
        return;
    }
    public function updatePlayer():void {
        var vx:Number = 0, vy:Number = 0;
        if (keys[0x25] || keys[0x41]) vx = -1;
        if (keys[0x26] || keys[0x57]) vy = -1;
        if (keys[0x27] || keys[0x44]) vx =  1;
        if (keys[0x28] || keys[0x53]) vy =  1;
        var isFiring:Boolean = isFirePressed();
        if (isFiring) addShot(pos, shotSpeed, fireWay, fireWayAngle, true);
        if (vx != 0 && vy != 0) { vx *= 0.7; vy *= 0.7; }
        pos.x += vx * speed; pos.y += vy * speed;
        if (pos.x < 10) pos.x = 10;
        else if (pos.x > SCREEN_WIDTH - 10) pos.x = SCREEN_WIDTH - 10;
        if (pos.y < 10) pos.y = 10;
        else if (pos.y > SCREEN_HEIGHT - 10) pos.y = SCREEN_HEIGHT - 10;
        g.moveTo(pos.x, pos.y - 10);
        g.lineTo(pos.x - 7, pos.y + 4);
        g.lineTo(pos.x + 7, pos.y + 4);
        g.lineTo(pos.x, pos.y - 10);
        var p:Vector3D = new Vector3D(pos.x, -(pos.y - SCREEN_HEIGHT * 0.5) + SCREEN_HEIGHT * 0.5);
        posRecord.push(p); fireRecord.push(isFiring);
    }
    public function checkHit(p:Vector3D):Boolean {
        if (!exists) return false;
        var isHit:Boolean = (Vector3D.distance(p, pos) < 15);
        if (isHit) {
            exists = false;
            if (isPlayer) startGameOver();
        }
        return isHit;
    }
}
function goToNextStage():void {
    var s:Ship;
    if (ships.length > 0) {
        ships[ships.length - 1].isPlayer = false;
    } else {
        s = new Ship;
        var p:Vector3D = new Vector3D(SCREEN_WIDTH * 0.5, SCREEN_HEIGHT * 0.25);
        s.posRecord = new Vector.<Vector3D>;
        s.fireRecord = new Vector.<Boolean>;
        s.posRecord.push(p); s.fireRecord.push(false);
        ships.push(s);
    }
    var sn:int = ships.length;
    s = new Ship;
    s.pos = new Vector3D;
    if (sn % 3 == 0) s.shotSpeed += 3;
    if (sn % 5 == 0) s.shotSpeed += 2;
    if (sn % 3 == 2) s.fireWay += 2;
    if (sn % 4 == 0) s.fireWay++;
    if (sn % 5 == 4) s.fireWay++;
    if (sn % 2 == 0) s.fireWayAngle *= 0.7;
    if (sn % 4 == 2) s.fireWayAngle *= 0.8;
    if (sn % 4 == 3) s.speed *= 1.4;
    s.isPlayer = true;
    ships.push(s);
    resetStage();
}
function resetStage():void {
    var sn:int = ships.length - 1;
    var s:Ship;
    for each (s in ships) { s.recordIndex = 0; s.exists = true; }
    shots = null; shots = new Vector.<Shot>;
    s = ships[ships.length - 1];
    s.pos.x = SCREEN_WIDTH * 0.5; s.pos.y = SCREEN_WIDTH * 0.75;
    s.posRecord = null; s.posRecord = new Vector.<Vector3D>;
    s.fireRecord = null; s.fireRecord = new Vector.<Boolean>;
    for (var x:int = 0; x <= SCREEN_WIDTH; x += 15) {
        addShot(new Vector3D(x, 30), 5.0 / (sn + 1), 1, 0, false);
    }
    messageField.y = 0;
    messageField.text = "Stage " + sn;
}
// Shots.
var shots:Vector.<Shot>;
class Shot {
    public var pos:Vector3D = new Vector3D, vel:Vector3D = new Vector3D;
    public var isPlayersShot:Boolean;
    public function update():Boolean {
        pos.incrementBy(vel);
        g.moveTo(pos.x, pos.y - 10);
        g.lineTo(pos.x, pos.y + 10);
        if (isPlayersShot) {
            for each (var s:Ship in ships) if (!s.isPlayer) if (s.checkHit(pos)) return false;
        } else {
            ships[ships.length - 1].checkHit(pos);
        }
        return (pos.x >= 0 && pos.x < SCREEN_WIDTH && pos.y >= 0 && pos.y < SCREEN_HEIGHT);
    }
}
function addShot(p:Vector3D, shotSpeed:Number, fireWay:int, fireWayAngle:Number, isPlayer:Boolean):void {
    var s:Shot, a:Number = 0, ai:Number;
    if (fireWay > 1) {
        a = -fireWayAngle;
        ai = fireWayAngle * 2 / (fireWay - 1);
    }
    for (var i:int = 0; i < fireWay; i++) {
        s = new Shot;
        s.pos.x = p.x; s.pos.y = p.y;
        var sa:Number = a;
        if (isPlayer) sa = PI - a;
        s.vel.x = shotSpeed * sin(sa); s.vel.y = shotSpeed * cos(sa);
        s.isPlayersShot = isPlayer;
        shots.push(s);
        a += ai;
    }
}
// Handle the game lifecycle.
var isInGame:Boolean, gameOverTicks:int;
function startGameOver():void {
    isInGame = false; gameOverTicks = 20;
    messageField.text = "GAME OVER";
}
// Utility functions and variables.
var sin:Function = Math.sin, cos:Function = Math.cos, PI:Number = Math.PI;
function createTextField(x:int, y:int, width:int, size:int, color:int):TextField {
    var fm:TextFormat = new TextFormat, fi:TextField = new TextField;
    fm.font = "_typewriter"; fm.bold = true; fm.size = size; fm.color = color; fm.align = TextFormatAlign.RIGHT;
    fi.defaultTextFormat = fm; fi.x = x; fi.y = y; fi.width = width; fi.selectable = false;
    return fi;
}

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