I am adding in a moving floor for a project and the player does not move with it, the character does collide, he just hovers over the initial starting position of the floor but does not move upward with it., any tips on how to fix this? Thank you!
package {
import flash.display.*;
import flash.events.*;
import flash.text.*;
import flash.utils.getTimer;
public class PlatformGame extends MovieClip {
// movement constants
static const gravity:Number = .004;
// screen constants
static const edgeDistance:Number = 100;
// object arrays
private var fixedObjects:Array;
private var otherObjects:Array;
// hero and enemies
private var hero:Object;
private var enemies:Array;
// game state
private var playerObjects:Array;
private var gameScore:int;
private var gameMode:String = "start";
private var playerLives:int;
private var lastTime:Number = 0;
// start game
public function startPlatformGame() {
playerObjects = new Array();
gameScore = 0;
gameMode = "play";
playerLives = 5;
}
// start level
public function startGameLevel() {
// create characters
createHero();
addEnemies();
// examine level and note all objects
examineLevel();
// add listeners
this.addEventListener(Event.ENTER_FRAME,gameLoop);
stage.addEventListener(KeyboardEvent.KEY_DOWN,keyDownFunction);
stage.addEventListener(KeyboardEvent.KEY_UP,keyUpFunction);
// set game state
gameMode = "play";
addScore(1);
showLives();
}
// creates the hero object and sets all properties
public function createHero() {
hero = new Object();
hero.mc = gamelevel.hero;
hero.dx = 0.0;
hero.dy = 0.0;
hero.inAir = false;
hero.direction = 1;
hero.animstate = "stand";
hero.walkAnimation = new Array(2,3,4,5,6,7,8);
hero.animstep = 0;
hero.jump = false;
hero.moveLeft = false;
hero.moveRight = false;
hero.jumpSpeed = .8;
hero.walkSpeed = .15;
hero.width = 20.0;
hero.height = 4.0;
hero.startx = hero.mc.x;
hero.starty = hero.mc.y;
}
// finds all enemies in the level and creates an object for each
public function addEnemies() {
enemies = new Array();
var i:int = 1;
while (true) {
if (gamelevel["enemy"+i] == null) break;
var enemy = new Object();
enemy.mc = gamelevel["enemy"+i];
enemy.dx = 0.0;
enemy.dy = 0.0;
enemy.inAir = false;
enemy.direction = 1;
enemy.animstate = "stand"
enemy.walkAnimation = new Array(2,3,4,5);
enemy.animstep = 0;
enemy.jump = false;
enemy.moveRight = true;
enemy.moveLeft = false;
enemy.jumpSpeed = 1.0;
enemy.walkSpeed = .08;
enemy.width = 30.0;
enemy.height = 30.0;
enemies.push(enemy);
i++;
}
}
// look at all level children and note walls, floors and items
public function examineLevel() {
fixedObjects = new Array();
otherObjects = new Array();
for(var i:int=0;i<this.gamelevel.numChildren;i++) {
var mc = this.gamelevel.getChildAt(i);
// add floors and walls to fixedObjects
if ((mc is Floor) || (mc is Wall) || (mc is MovingFloor)) {
var floorObject:Object = new Object();
floorObject.mc = mc;
floorObject.leftside = mc.x;
floorObject.rightside = mc.x+mc.width;
floorObject.topside = mc.y;
floorObject.bottomside = mc.y+mc.height;
fixedObjects.push(floorObject);
// add treasure, key and door to otherOjects
} else if ((mc is Treasure) || (mc is Key) || (mc is Door) || (mc is Chest)) {
otherObjects.push(mc);
}
}
}
// note key presses, set hero properties
public function keyDownFunction(event:KeyboardEvent) {
if (gameMode != "play") return; // don't move until in play mode
if (event.keyCode == 37) {
hero.moveLeft = true;
} else if (event.keyCode == 39) {
hero.moveRight = true;
} else if (event.keyCode == 32) {
if (!hero.inAir) {
hero.jump = true;
}
}
}
public function keyUpFunction(event:KeyboardEvent) {
if (event.keyCode == 37) {
hero.moveLeft = false;
} else if (event.keyCode == 39) {
hero.moveRight = false;
}
}
// perform all game tasks
public function gameLoop(event:Event) {
// get time differentce
if (lastTime == 0) lastTime = getTimer();
var timeDiff:int = getTimer()-lastTime;
lastTime += timeDiff;
// only perform tasks if in play mode
if (gameMode == "play") {
moveCharacter(hero,timeDiff);
moveEnemies(timeDiff);
checkCollisions();
scrollWithHero();
}
}
// loop through all enemies and move them
public function moveEnemies(timeDiff:int) {
for(var i:int=0;i<enemies.length;i++) {
// move
moveCharacter(enemies,timeDiff);
// if hit a wall, turn around
if (enemies.hitWallRight) {
enemies.moveLeft = true;
enemies.moveRight = false;
} else if (enemies.hitWallLeft) {
enemies.moveLeft = false;
enemies.moveRight = true;
}
}
}
// primary function for character movement
public function moveCharacter(char:Object,timeDiff:Number) {
if (timeDiff < 1) return;
// assume character pulled down by gravity
var verticalChange:Number = char.dy*timeDiff + timeDiff*gravity;
if (verticalChange > 15.0) verticalChange = 15.0;
char.dy += timeDiff*gravity;
// react to changes from key presses
var horizontalChange = 0;
var newAnimState:String = "stand";
var newDirection:int = char.direction;
if (char.moveLeft) {
// walk left
horizontalChange = -char.walkSpeed*timeDiff;
newAnimState = "walk";
newDirection = -1;
} else if (char.moveRight) {
// walk right
horizontalChange = char.walkSpeed*timeDiff;
newAnimState = "walk";
newDirection = 1;
}
if (char.jump) {
// start jump
char.jump = false;
char.dy = -char.jumpSpeed;
verticalChange = -char.jumpSpeed;
newAnimState = "jump";
}
// assume no wall hit, and hanging in air
char.hitWallRight = false;
char.hitWallLeft = false;
char.inAir = true;
// find new vertical position
var newY:Number = char.mc.y + verticalChange;
// loop through all fixed objects to see if character has landed
for(var i:int=0;i<fixedObjects.length;i++) {
if ((char.mc.x+char.width/2 > fixedObjects.leftside) && (char.mc.x-char.width/2 < fixedObjects.rightside)) {
if ((char.mc.y <= fixedObjects.topside) && (newY > fixedObjects.topside)) {
newY = fixedObjects.topside;
char.dy = 0;
char.inAir = false;
break;
}
}
}
// find new horizontal position
var newX:Number = char.mc.x + horizontalChange;
// loop through all objects to see if character has bumped into a wall
for(i=0;i<fixedObjects.length;i++) {
if ((newY > fixedObjects.topside) && (newY-char.height < fixedObjects.bottomside)) {
if ((char.mc.x-char.width/2 >= fixedObjects.rightside) && (newX-char.width/2 <= fixedObjects.rightside)) {
newX = fixedObjects.rightside+char.width/2;
char.hitWallLeft = true;
break;
}
if ((char.mc.x+char.width/2 <= fixedObjects.leftside) && (newX+char.width/2 >= fixedObjects.leftside)) {
newX = fixedObjects.leftside-char.width/2;
char.hitWallRight = true;
break;
}
}
}
// set position of character
char.mc.x = newX;
char.mc.y = newY;
// set animation state
if (char.inAir) {
newAnimState = "jump";
}
char.animstate = newAnimState;
// move along walk cycle
if (char.animstate == "walk") {
char.animstep += timeDiff/60;
if (char.animstep > char.walkAnimation.length) {
char.animstep = 0;
}
char.mc.gotoAndStop(char.walkAnimation[Math.floor(char.animstep)]);
// not walking, show stand or jump state
} else {
char.mc.gotoAndStop(char.animstate);
}
// changed directions
if (newDirection != char.direction) {
char.direction = newDirection;
char.mc.scaleX = char.direction;
}
}
// scroll to the right or left if needed
public function scrollWithHero() {
var stagePosition:Number = gamelevel.x+hero.mc.x;
var rightEdge:Number = stage.stageWidth-edgeDistance;
var leftEdge:Number = edgeDistance;
if (stagePosition > rightEdge) {
gamelevel.x -= (stagePosition-rightEdge);
if (gamelevel.x < -(gamelevel.width-stage.stageWidth)) gamelevel.x = -(gamelevel.width-stage.stageWidth);
}
if (stagePosition < leftEdge) {
gamelevel.x += (leftEdge-stagePosition);
if (gamelevel.x > 0) gamelevel.x = 0;
}
}
// check collisions with enemies, items
public function checkCollisions() {
// enemies
for(var i:int=enemies.length-1;i>=0;i--) {
if (hero.mc.hitTestObject(enemies.mc)) {
// is the hero jumping down onto the enemy?
if (hero.inAir && (hero.dy > 0)) {
enemyDie(i);
} else {
heroDie();
}
}
}
// items
for(i=otherObjects.length-1;i>=0;i--) {
if (hero.mc.hitTestObject(otherObjects)) {
getObject(i);
}
}
}
// remove enemy
public function enemyDie(enemyNum:int) {
var pb:PointBurst = new PointBurst(gamelevel,"Vanquished!",enemies[enemyNum].mc.x,enemies[enemyNum].mc.y-20);
gamelevel.removeChild(enemies[enemyNum].mc);
enemies.splice(enemyNum,1);
}
// enemy got player
public function heroDie() {
// show dialog box
var dialog:Dialog = new Dialog();
dialog.x = 175;
dialog.y = 100;
addChild(dialog);
if (playerLives == 0) {
gameMode = "gameover";
dialog.message.text = "Game Over!";
} else {
gameMode = "dead";
dialog.message.text = "You Died!";
playerLives--;
}
hero.mc.gotoAndPlay("die");
}
// player collides with objects
public function getObject(objectNum:int) {
// award points for treasure
if (otherObjects[objectNum] is Treasure) {
var pb:PointBurst = new PointBurst(gamelevel,100,otherObjects[objectNum].x,otherObjects[objectNum].y);
gamelevel.removeChild(otherObjects[objectNum]);
otherObjects.splice(objectNum,1);
addScore(100);
// got the key, add to inventory
} else if (otherObjects[objectNum] is Key) {
pb = new PointBurst(gamelevel,"Got Key!" ,otherObjects[objectNum].x,otherObjects[objectNum].y);
playerObjects.push("Key");
gamelevel.removeChild(otherObjects[objectNum]);
otherObjects.splice(objectNum,1);
// hit the door, end level if hero has the key
} else if (otherObjects[objectNum] is Door) {
if (playerObjects.indexOf("Key") == -1) return;
if (otherObjects[objectNum].currentFrame == 1) {
otherObjects[objectNum].gotoAndPlay("open");
levelComplete();
}
// got the chest, game won
} else if (otherObjects[objectNum] is Chest) {
otherObjects[objectNum].gotoAndStop("open");
gameComplete();
}
}
// add points to score
public function addScore(numPoints:int) {
gameScore += numPoints;
scoreDisplay.text = String(gameScore);
}
// update player lives
public function showLives() {
livesDisplay.text = String(playerLives);
}
// level over, bring up dialog
public function levelComplete() {
gameMode = "done";
var dialog:Dialog = new Dialog();
dialog.x = 175;
dialog.y = 100;
addChild(dialog);
dialog.message.text = "Level Complete!";
}
// game over, bring up dialog
public function gameComplete() {
gameMode = "gameover";
var dialog:Dialog = new Dialog();
dialog.x = 175;
dialog.y = 100;
addChild(dialog);
dialog.message.text = "You Got the Treasure!";
}
// dialog button clicked
public function clickDialogButton(event:MouseEvent) {
removeChild(MovieClip(event.currentTarget.parent));
// new life, restart, or go to next level
if (gameMode == "dead") {
// reset hero
showLives();
hero.mc.x = hero.startx;
hero.mc.y = hero.starty;
gameMode = "play";
} else if (gameMode == "gameover") {
cleanUp();
gotoAndStop("start");
} else if (gameMode == "done") {
cleanUp();
nextFrame();
}
// give stage back the keyboard focus
stage.focus = stage;
}
// clean up game
public function cleanUp() {
removeChild(gamelevel);
this.removeEventListener(Event.ENTER_FRAME,gameLoop);
stage.removeEventListener(KeyboardEvent.KEY_DOWN,keyDownFunction);
stage.removeEventListener(KeyboardEvent.KEY_UP,keyUpFunction);
}
}
}
1 Correct answer
in the loop where you update the player's x and y properties, update the y player's property based on the platform's y property.
3
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