I have been working on a game in flash as3, which worked perfectly up until I rearranged all of the variables up at the top to make it easier to read. Now the debugger is throwing an Error 1009 for many of the variables during run time, despite their definitions not having changed.
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at Main_fla::MainTimeline/Update()[Main_fla.MainTimeline::frame3:201]
The error points me to:
if (S) {
legRot = 180;
}
Despite that fact that both S and legRot are defined as;
var legRot:Number = 0;
and
var S:Boolean = false;
with the rest of the variables at the top f the actions on the frame.
Any help is appreciated,
Thank You.
Edit
Here are my variable definitions ;
//Numbers
var currentAmmo = 1;
var xVel = 0;
var yVel = 0;
var xCollision = 0;
var yCollision = 0;
var enemySpeed = 4;
var ExplodeOnce = 0;
var EnemyWalking = 0;
var legRot = 0;
var dropxVel: Number = 0;
var dropyVel: Number = 0;
var E = 0;
//Booleans
var A:Boolean = false;
var W:Boolean = false;
var S:Boolean = false;
var D:Boolean = false;
var SHIFT:Boolean = false;
var Q:Boolean = false;
var dead = false;
And here is where the error is occuring;
if (W) {
legRot = 0;
}
if (A) {
legRot = -90;
}
if (S) {
legRot = 180;
}
if (D) {
legRot = 90;
}
if (A && W) {
legRot = -45
};
if (W && D) {
legRot = 45
};
if (D && S) {
legRot = 115
};
if (S && A) {
legRot = -115
};
if (!dead){
player.TopBody.rotation = Math.atan2(mouseY - player.y, mouseX - player.x) * 180 / Math.PI + 90;
if (!W && !A && !S && !D) {
player.BottomLegs.gotoAndStop(1);
player.BottomLegs.rotation = Math.atan2(mouseY - player.y, mouseX - player.x) * 180 / Math.PI + 90;
} else {
player.BottomLegs.play();
player.BottomLegs.rotation += (legRot - player.BottomLegs.rotation) / 4;
}
}
Found the problem. I accidentally added an Event Listener to a timer before the timer was created up with the variable definitions. Why this was throwing errors in the update function, which is a completely different listener, is beyond me. But its fixed now.
Thank you all!
Related
I have generated a maze using depth first search - recursive backtracker algorithm. I also want to solve, but not getting idea about how to start solving my maze.
I am using p5.js to create my maze, and want to solve my already generated maze.
This is my javascript code for generating maze. You might want to add p5.js cdn in your html file if you want to run this code.
var cols, rows;
var w = 40;
var grid = [];
var current;
var stack = [];
function setup() {
createCanvas(400,400);
cols = floor(width/w);
rows = floor(height/w);
frameRate(5);
for (var j = 0; j<rows; j++){
for (var i = 0; i < cols; i++) {
var cell = new Cell(i,j);
grid.push(cell);
}
}
current = grid[0];
}
function draw(){
background(51);
for (var i = 0; i<grid.length; i++){
grid[i].show();
}
current.visited = true;
current.highlight();
var next = current.checkNeighbours();
if (next) {
next.visited = true;
stack.push(current);
removeWalls(current,next);
current = next;
}
else if(stack.length > 0){
current = stack.pop();
}
}
function index(i,j){
if (i < 0 || j < 0 || i > cols-1 || j > rows-1) {
return -1;
}
return i + j * cols;
}
function Cell(i,j){
this.i = i;
this.j = j;
this.walls = [true,true,true,true];
this.visited = false;
this.checkNeighbours = function(){
var neighbours = [];
var top = grid[index(i, j-1)];
var right = grid[index(i+1, j)];
var bottom = grid[index(i, j+1)];
var left = grid[index(i-1, j)];
if (top && !top.visited){
neighbours.push(top);
}
if (right && !right.visited){
neighbours.push(right);
}
if (bottom && !bottom.visited){
neighbours.push(bottom);
}
if (left && !left.visited){
neighbours.push(left);
}
if (neighbours.length > 0){
var r = floor(random(0, neighbours.length));
return neighbours[r];
}
else{
return undefined;
}
}
this.highlight = function(){
x = this.i*w;
y = this.j*w;
noStroke();
fill(0,0,255,200);
rect(x,y,w,w);
}
this.show = function(){
x = this.i*w;
y = this.j*w;
stroke(255);
if (this.walls[0]){
line(x ,y ,x+w ,y);
}
if (this.walls[1]){
line(x+w ,y ,x+w ,y+w);
}
if (this.walls[2]){
line(x+w ,y+w ,x ,y+w);
}
if (this.walls[3]){
line(x ,y+w ,x ,y)
}
if (this.visited) {
noStroke();
fill(255,0,255,100);
rect(x,y,w,w);
}
}
}
function removeWalls(a,b){
var x = a.i - b.i;
if (x === 1){
a.walls[3] = false;
b.walls[1] = false;
}
else if (x === -1){
a.walls[1] = false;
b.walls[3] = false;
}
var y = a.j - b.j;
if (y === 1){
a.walls[0] = false;
b.walls[2] = false;
}
else if (y === -1){
a.walls[2] = false;
b.walls[0] = false;
}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.7.3/p5.js"></script>
There are many algorithmsfor solving mazes. One simple way to solve mazes created with the recursive backtracker algorithm is to keep track of the solution as the maze is being generated.
Make the first cell the starting cell and push it onto the solution stack
Make the last cell the goal cell
While the solution stack does not contain the goal cell
if the next neighbor is un-visited push it onto the solution stack
if a cell has no next neighbor pop the solution stack as we are backtracking
When the goal cell is pushed onto the solution stack mark the solution complete
Adapting the questions code so that it also implements the solution algorithm we have:
var cols, rows;
var w = 40;
var grid = [];
var current;
var stack = [];
var solution = [];
var goal;
var solutionComplete;
function setup() {
createCanvas(400,400);
cols = floor(width/w);
rows = floor(height/w);
frameRate(5);
for (var j = 0; j<rows; j++){
for (var i = 0; i < cols; i++) {
var cell = new Cell(i,j);
grid.push(cell);
}
}
current = grid[0];
grid[grid.length - 1].goal = true;
solution.push(grid[0]);
}
function draw(){
background(51);
for (var i = 0; i<grid.length; i++){
grid[i].show();
}
current.visited = true;
current.highlight();
var next = current.checkNeighbours();
if (next) {
if (!next.visited){
if (!solutionComplete){
solution.push(next);
if (next.goal){
solutionComplete = true;
}
}
}
next.visited = true;
stack.push(current);
removeWalls(current,next);
current = next;
}
else if(stack.length > 0){
current = stack.pop();
if (!solutionComplete){
solution.pop();
}
}
if (solutionComplete){
for (let i = 0; i < solution.length; i++){
solution[i].solutionCell = true;
}
}
}
function index(i,j){
if (i < 0 || j < 0 || i > cols-1 || j > rows-1) {
return -1;
}
return i + j * cols;
}
function Cell(i,j){
this.i = i;
this.j = j;
this.walls = [true,true,true,true];
this.visited = false;
this.goal = false;
this.solutionCell = false;
this.checkNeighbours = function(){
var neighbours = [];
var top = grid[index(i, j-1)];
var right = grid[index(i+1, j)];
var bottom = grid[index(i, j+1)];
var left = grid[index(i-1, j)];
if (top && !top.visited){
neighbours.push(top);
}
if (right && !right.visited){
neighbours.push(right);
}
if (bottom && !bottom.visited){
neighbours.push(bottom);
}
if (left && !left.visited){
neighbours.push(left);
}
if (neighbours.length > 0){
var r = floor(random(0, neighbours.length));
return neighbours[r];
}
else{
return undefined;
}
}
this.highlight = function(){
x = this.i*w;
y = this.j*w;
noStroke();
fill(0,0,255,200);
rect(x,y,w,w);
}
this.show = function(){
x = this.i*w;
y = this.j*w;
stroke(255);
if (this.walls[0]){
line(x ,y ,x+w ,y);
}
if (this.walls[1]){
line(x+w ,y ,x+w ,y+w);
}
if (this.walls[2]){
line(x+w ,y+w ,x ,y+w);
}
if (this.walls[3]){
line(x ,y+w ,x ,y)
}
if (this.goal){
noStroke();
fill(0,255,0,100);
rect(x,y,w,w);
}
else if (this.solutionCell){
noStroke();
fill(255,0,0,100);
rect(x,y,w,w);
}else if(this.visited) {
noStroke();
fill(255,0,255,100);
rect(x,y,w,w);
}
}
}
function removeWalls(a,b){
var x = a.i - b.i;
if (x === 1){
a.walls[3] = false;
b.walls[1] = false;
}
else if (x === -1){
a.walls[1] = false;
b.walls[3] = false;
}
var y = a.j - b.j;
if (y === 1){
a.walls[0] = false;
b.walls[2] = false;
}
else if (y === -1){
a.walls[2] = false;
b.walls[0] = false;
}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.7.2/p5.min.js"></script>
It would not be difficult to break the maze generation and solution implementations apart so that the maze is completely generated before the solution is determined but unless there is a restriction that forces us to solve a completed maze it makes sense to build the solution along with the maze.
Sorry about this this is very related but coding train a coding youtuber made a maze generating algorithm, but i don't know if it used depth first search
I am am doing this for a interactive assignment for a media arts class and I have no idea how to code in action script 3. I took the orignal code from a tutorial and it didn't work so I came here and attempted to learn how to modify it.
AS3 Code
//*********************
// Initialize:
flash.events.MouseEvent
var numPieces = 16;
for (var i = 0; i < numPieces; i++)
{
var pieceName = "p" + (i + 1);
var piece = this[pieceName];
if( piece ){
piece.name = pieceName;
piece.addEventListener(MouseEvent.MOUSE_DOWN, function)(evt)
{
this.scaleX = 1;
this.scaleY = 1;
this.shadow = null;
this.parent.addChild(this);// Bump to top
this.offset = {x:this.x - evt.stageX, y:this.y - evt.stageY};
});
piece.addEventListener(MouseEvent.MOUSE_MOVE, function)
{
this.x = evt.stageX + this.offset.x;
this.y = evt.stageY + this.offset.y;
});
piece.addEventListener(MouseEvent.MOUSE_UP, function)(evt)
{
var target = this.parent["t"+this.name.substr(1)];
if( target && hitTestInRange( target, 30) ){
this.x = target.x;
this.y = target.y;
}
});
}
}
function hitTestInRange( target, range )
{
if( target.x > stage.mouseX - range &&
target.x < stage.mouseX + range &&
target.y > stage.mouseY - range &&
target.y < stage.mouseY + range )
{
return true;
}
return false;
}
Please help me fix this code so I can run my puzzle and move the pieces.
I can upload the flash file if needed
I have now figured out that After I restart my game The Enter_frame function is not looping? why is that.
Enter_Frame:
public function enter_frame(e:Event)
{
trace("rGame = " + rGame);
_Menu();
if(mGameStart)
{
//Stage & Players
_PlayerStart();
_PlayerCon();
_MoveStage();
}
if(rGame)
{
_PlayerCon();
trace("_PlayerCon(): Done");
_MoveStage();
}
if(Game_Over)
{
mGameStart = false;
GameOver();
}
}
Pipe_Spawn:
private function eSpawn()
{
for(var i:int = 0; i < ePipeMax; i++)
{
var _Pipe:EPipe = new EPipe;
_Pipe.x = (i * 250) + 640;
_Pipe.y = Math.random() * 90;
PipeLayer.addChild(_Pipe);
}
}
Pipe_Move:
public function _MoveStage():void
{
//Pipes Move
for (var i:int; i < vPipeMax; i++)
{
var _Pipe = PipeLayer.getChildAt(i);
if(_Pipe.hitTestPoint(_Player.x, _Player.y, true))
{
blink = true;
Remove(_White);
Game_Over = true;
}
else
{
if(_Pipe.x < 241 && _Pipe.x > 234){
ScoreReady = true;
}
else
{
ScoreReady = false;
two = true;
}
if(ScoreReady && two)
{
Score++;
Scores.text = Score.toString();
two = false;
}
if(_Pipe.x <= -20)
{
_Pipe.x = 640 + 100;
_Pipe.y = Math.random()*90;
}
_Pipe.x -= xSpeed;
}
}
}
Game_Restart:
public function restartButton(m:MouseEvent)
{
GOSign.y = 1000;
R_Button.y = 1000;
Scores.y = 105.65;
HighScore.x = 500;
ScoreReady = false;
two = true;
HighScore5();
_Player.x = 240;
_Player.y = 320;
//This is where I restart the position of the pipes
for (var i:int = 0; i < vPipeMax; i++)
{
var _Pipe = PipeLayer.getChildAt(i);
_Pipe.x = (i * 250) + 640;
_Pipe.y = Math.random() * 90;
}
rGame = true;
}
Iv been at this for about two weeks and can not fix it. Thank you for reading.
I have found my problem. It was a VERY stupid mistake and I cant believe it took me this long to figure it out. I forgot to reset a variable ~facepalm~. I guess you learn from your mistakes lol
Sorry if this question is a bit vague, but this has been driving me nuts recently. It's nothing too complicated, but all I want to do is have the variable 'targetVariable' be affected by a formula. The actual problem lies in the fact that the referenced variable, being 'masterVolume' in this case, is not getting affected by the formula, but rather 'targetVariable' instead. I run the 'makeSlider' function at the bottom of the script. Here's the code:
var masterVolume:Number = 0;
var panning:Number = 0;
function makeSlider(sliderType, X, Y, targetVariable) {
var sliderHandle:MovieClip = new sliderType();
addChild(sliderHandle);
sliderHandle.x = X;
sliderHandle.y = Y;
var dragging:Boolean = false;
stage.addEventListener(Event.ENTER_FRAME, updateSlider);
function updateSlider(e:Event):void {
panning = (mouseX/(stage.stageWidth/2))-1;
targetVariable = ((sliderHandle.x-bar.x)/bar.width);
output.text = masterVolume.toString();
if (dragging == true && mouseX >= bar.x && mouseX <= (bar.x + bar.width)) {
sliderHandle.x = mouseX;
}
}
sliderHandle.addEventListener(MouseEvent.MOUSE_DOWN, beginDrag);
function beginDrag(e:MouseEvent):void {
dragging = true;
}
stage.addEventListener(MouseEvent.MOUSE_UP, endDrag);
function endDrag(e:MouseEvent):void {
dragging = false;
}
}
function playSound(target, intensity:Number, pan:Number) {
var sound:Sound = new target();
var transformer:SoundTransform = new SoundTransform(intensity, pan);
var channel:SoundChannel = new SoundChannel();
channel=sound.play();
channel.soundTransform = transformer;
}
stage.addEventListener(MouseEvent.MOUSE_DOWN, make);
function make(e:MouseEvent):void {
playSound(test, masterVolume, panning);
}
makeSlider(SliderHandle, bar.x, bar.y, masterVolume);
Okay, so I studied the Object class and found out that I could reference the variable by making it an object in the function. Here's the updated, working script:
var panning:Number = 0;
var masterVolume:Number = 0;
function makeSlider(sliderType, barType, soundType, hitBoxScale:Number, X, Y, targetVariable) {
var reference:Object = { targetVariable: 0 };
var slider:MovieClip = new sliderType;
var newBar:MovieClip = new barType;
addChild(newBar);
newBar.x = X;
newBar.y = Y;
addChild(slider);
slider.x = X;
slider.y = Y;
var dragging:Boolean = false;
stage.addEventListener(Event.ENTER_FRAME, updateSlider);
function updateSlider(e:Event):void {
panning = (mouseX/(stage.stageWidth/2))-1;
reference.targetVariable = (slider.x-newBar.x)/newBar.width;
if (dragging == true && mouseX >= newBar.x && mouseX <= (newBar.x + newBar.width)) {
slider.x = mouseX;
}
if (reference.targetVariable <= 0.01) {
output.text = ("None");
}
if (reference.targetVariable >= 0.99) {
output.text = ("Max");
}
if (reference.targetVariable > 0.01 && reference.targetVariable < 0.99) {
output.text = (Math.round((reference.targetVariable*100))+"%").toString();
}
}
stage.addEventListener(MouseEvent.MOUSE_DOWN, beginDrag);
function beginDrag(e:MouseEvent):void {
if (mouseY >= newBar.y-hitBoxScale && mouseY <= (newBar.y + newBar.height)+hitBoxScale) {
dragging = true;
}
}
slider.addEventListener(MouseEvent.MOUSE_DOWN, beginDragFromSlider);
function beginDragFromSlider(e:MouseEvent):void {
dragging = true;
}
stage.addEventListener(MouseEvent.MOUSE_UP, endDrag);
function endDrag(e:MouseEvent):void {
if (dragging == true) {
playSound(soundType, reference.targetVariable, 0);
}
dragging = false;
}
stage.addEventListener(MouseEvent.MOUSE_DOWN, make);
function make(e:MouseEvent):void {
if (dragging == false) {
playSound(test, reference.targetVariable, panning);
}
}
}
function playSound(target, intensity:Number, pan:Number) {
var sound:Sound = new target();
var transformer:SoundTransform = new SoundTransform(intensity, pan);
var channel:SoundChannel = new SoundChannel();
channel=sound.play();
channel.soundTransform = transformer;
}
makeSlider(defaultSlider, defaultBar, volumeIndicator, 10, 134, 211, masterVolume);
I'm in over my head in this AS3 project.
I'm no expert in actionscript and certainly not in AS3 but I managed to create (with help from this: http://swamy-techtalk.blogspot.com/2011/07/elastic-string-to-mouse-pointer-effect.html) a eleastic string effect from a point to a draggable movieclip.
Problem is the script seems to crash flash or the browser when I test it. (Not right away just when I'm playing around with the movieclip)
Sinse I'm in over my head in the script I compiled I'm not exactly sure whats wrong.
A bit of google research hinted that it might have something to do with removeChildAt() wich I changed from removeChildAt(0) to removeChildAt(1) to prevent it from removing my movieclip.
Hope somebody has the patience to read through my script to see what I did wrong.
Example here: http://www.madsringblom.dk/flash/pullstring.html (beware it might crash your browser)
Code below:
Object(this).leaf_mc.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
stage.addEventListener(MouseEvent.MOUSE_UP, mouseUpHandler);
var origX:int = Object(this).leaf_mc.x + 1;
var origY:int = Object(this).leaf_mc.y + 2;
var pullbackX:int = Object(this).leaf_mc.x;
var pullbackY:int = Object(this).leaf_mc.y;
var dragging:Boolean = false;
//speed of pulling and rotating back when stop dragging.
var speed:int = 15;
var addX:int = 2
var addY:int = 3
function mouseDownHandler(e:MouseEvent):void
{
var obj = e.target;
obj.startDrag();
dragging = true;
}
function mouseUpHandler(e:MouseEvent):void
{
var obj = e.target;
Object(this).leaf_mc.stopDrag();
dragging = false;
}
import flash.display.*;
import flash.events.MouseEvent;
import flash.events.Event;
var haschild:Boolean = false;
var gotonodes:Array = new Array();
var currentnodes:Array = new Array();
var posX:int = Object(this).leaf_mc.x + addX;
var posY:int = Object(this).leaf_mc.y + addY;
gotonodes = Interpolate(posX,posY,origX,origY,25);
currentnodes = gotonodes;
stage.addEventListener(Event.ENTER_FRAME, onmove1);
function onmove1(e:Event)
{
for (var node = 0; node < gotonodes.length - 1; node++)
{
currentnodes[node].xco=currentnodes[node].xco+(gotonodes[node].xco-currentnodes[node].xco)/(node*node/30+1);
currentnodes[node].yco=currentnodes[node].yco+(gotonodes[node].yco-currentnodes[node].yco)/(node*node/30+1);
}
var posX:int = Object(this).leaf_mc.x + addX;
var posY:int = Object(this).leaf_mc.y + addY;
gotonodes=Interpolate(posX,posY,origX,origY,25);
// pull leaf_mc back to starting point when released. And rotate back.
if (dragging == false)
{
Object(this).leaf_mc.x-=(Object(this).leaf_mc.x-pullbackX)/speed;
Object(this).leaf_mc.y-=(Object(this).leaf_mc.y-pullbackY)/speed;
Object(this).leaf_mc.rotation+=Object(this).leaf_mc.rotation/speed;
}
// rotating the leaf_mc according to the point (origX,origY)
var theX:int = origX - Object(this).leaf_mc.x;
var theY:int = (origY - Object(this).leaf_mc.y) * -1;
var angle = Math.atan(theY/theX)/(Math.PI/180);
Math.atan( -5 / 10) / (Math.PI / 180);
if (theX < 0)
{
angle += 180;
}
if (theX >= 0 && theY < 0)
{
angle += 360;
}
Object(this).leaf_mc.rotation = (angle*-1) + 90;
DrawNodes(currentnodes);
}
function FindAngle(x1, x2, y1, y2):Number
{
return Math.atan2(y2-y1, x2-x1);
};
function Distance(x1, x2, y1, y2):Number
{
return Math.sqrt(Math.pow(x2-x1,2)+Math.pow(y2-y1,2));
}
function Interpolate(x1, y1, x2, y2, n):Array
{
var dist= Distance(x1,x2,y1,y2);
var ang = FindAngle(x1,x2,y1,y2);
var points = [];
for (var l = 0; l <= dist; l += dist / n)
{
var x3 =x1+l*Math.cos(ang);
var y3 = y1+l*Math.sin(ang);
points.push({xco:x3,yco:y3});
}
points.push( { xco:x1, yco:y1 } );
return points;
}
function DrawNodes(array):void
{
if(haschild)
{
this.removeChildAt(1);
haschild=false;
}
var shape:Shape = new Shape();
shape.graphics.lineStyle(1,0x331100,40);
shape.graphics.moveTo(array[0].xco, array[0].yco);
for (var i = 0; i < array.length - 1; i++)
{
shape.graphics.lineTo(array[i].xco,array[i].yco);
}
shape.graphics.beginFill(0xFBFFA4,1);
shape.graphics.drawCircle(array[0].xco,array[0].yco,1);
shape.graphics.endFill();
this.addChild(shape);
haschild = true;
}
Where is this code placed? From what you pasted, I'm thinking on the stage.
A stop(); somewhere in the script might be a start and help quite a bit - otherwise the Flash movie will loop, and every time it hits this frame (every frame if you only have one), you'll add new event handlers etc. Eventually you'll run out of memory, and the onmove1 event handler will eat up your CPU, running 50 times per frame after 50 frames, 200 times after 200 frames etc.