I am making a small AS3 function of the Collatz conjecture.
This is the code:
import flash.events.Event;
import flash.events.MouseEvent;
var numb:int=0
var amount:int=0
button.addEventListener(MouseEvent.CLICK, buttonclick)
function buttonclick(buttonclicked:MouseEvent):void{
numb=int(input.text)
trace(numb)
amount=0
}
stage.addEventListener(Event.ENTER_FRAME, equate)
function equate(equate:Event):void{
dynam.text=amount.toString() + "\n" + numb.toString();;
if(numb !=0 && numb !=1){
if(numb % 2 == 0){
numb=numb/2
amount+=1
}
else{
numb=numb*3+1
amount+=1
}
}
}
However, sometimes the textinput becomes a negative number.
123123123123 turns into -1430928461
12312312312321312 turns into -1715645152
And so on.
I do not know why, but I think it has to do with
numb=int(input.text)
But I do not want to do absolute value, because then the equation would make the wrong results.
If you want it to stop on the negative number (and test it yourself) do this:
if(numb !=0 && numb !=1 && numb>1)
Instead of
if(numb !=0 && numb !=1)
12312312312321312 turns into -1715645152
That amount of digits won't fit into integer data type. Replace each int with Number and test again.
ie : var numb:Number=0; and var amount:Number=0; and numb=Number(input.text);
Related
I'm trying to create a new keyboard somehow, for educational purposes.
I've written this code using actionscript 3.I've created an input text field (named it t1) .when the user presses q button on keyboard(which has an ASCII aquals 81 ) I want the letter b to be printed out on the text field so i've written this code :
stage.addEventListener(KeyboardEvent.KEY_DOWN, pressing);
function pressing(event:KeyboardEvent):void
{
//trace(event.keyCode);
if(event.keyCode==81)
t1.replaceSelectedText("b");
}
the problem was that the method replaceSelectedText prints the tow letters on the screen(q&b) which method can i use instead?
Any help would be appreciated.
When using the replaceSelectedText method, you first need to select the text you want to replace. This can be done with the "setSelection" method. This from the adobe help website:
setSelection(beginIndex:int, endIndex:int):void
"Sets as selected the text designated by the index values of the first and last characters, which are specified with the beginIndex and endIndex parameters."
At the moment, since you don't have any text selected, it appears to just be adding the text "b" as it's replacing nothing. Therefore, you should try first selecting the "q".
Alternatively, you can just use a different method. from the adobe help website:
replaceText(beginIndex:int, endIndex:int, newText:String):void
"Replaces the range of characters that the beginIndex and endIndex parameters specify with the contents of the newText parameter."
This would cut out an extra line of code.
I haven't actually done this myself, so if that doesn't work, here's the link to the adobe help page for Text Fields: http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/text/TextField.html
I think that to do what you are looking for ( replace a char when it's typed ), a KeyboardEvent.KEY_DOWN is not enough, because when that event is fired, the text is not yet changed, so any change that you did in its handler to your text field will not cancel the insertion of the current typed char. Also, using KeyboardEvent.KEY_UP ( in addition to KeyboardEvent.KEY_DOWN ) will not resolve the problem, because you can fire n times a KeyboardEvent.KEY_DOWN event with the KeyboardEvent.KEY_UP event fired once !
So, I think that the best event that can do the job is the Event.CHANGE event which is fired every time the text of your text field is changed, so you can do like this :
// is there a char to replace ?
var replace_char:Boolean = false;
// the position of the char that we want to replace
var char_position:int = -1;
var text_input:TextField = new TextField();
text_input.type = 'input';
text_input.border = true;
text_input.addEventListener(Event.CHANGE, onTextChange);
function onTextChange(e:Event):void {
if(replace_char && char_position >= 0){
text_input.replaceText(char_position, char_position + 1, 'b');
replace_char = false;
}
}
addChild(text_input);
stage.addEventListener(KeyboardEvent.KEY_DOWN, _onKeyDown);
function _onKeyDown(e:KeyboardEvent):void {
if(e.keyCode == 81) {
replace_char = true;
char_position = text_input.selectionBeginIndex;
}
}
EDIT :
To use a list of keys and their equivalents, you can use an object to stock your keys like this :
// list of all keys (chars) and their equivalents
var chars:Object = {
81: 'b', // q => b
83: 'v', // s => v
68: 'c' // d => c
// other chars
}
var char_to_replace:int = -1;
// other instructions
function onTextChange(e:Event):void {
if(replace_char && char_position >= 0 && char_to_replace >= 0){
// get the equivalent of the pressed key from chars object using : chars[key_pressed]
text_input.replaceText(char_position, char_position + 1, chars[char_to_replace]);
replace_char = false;
}
}
// other instructions
function _onKeyDown(e:KeyboardEvent):void {
if(chars[e.keyCode]) {
replace_char = true;
// save the last pressed key to get its equivalent, or save this last one directly, to replace it next
char_to_replace = e.keyCode;
char_position = text_input.selectionBeginIndex;
}
}
Hope that can help.
as3 using appendText. I'm simply stringing out numbers like entering from a button press.
key2.addEventListener(MouseEvent.MOUSE_DOWN, thisButkey2);
function thisButkey2 (e:MouseEvent):void{
displayNums.appendText("2") ;
}
key3.addEventListener(MouseEvent.MOUSE_DOWN, thisButkey3);
function thisButkey3 (e:MouseEvent):void{
displayNums.appendText("3") ;
}
How do I total the string text into one number? I'd like to find out if it is > 100.
I solved it - It simply needed to be turned into a Number.
keyEnter.addEventListener(MouseEvent.MOUSE_DOWN, thisButEnter);
function thisButEnter (e:MouseEvent):void{
totalSum = Number(displayNums.text)
if ( totalSum > 100){
clearNums();
}
}
Here's a way to do this:
stage.addEventListener(KeyboardEvent.KEY_DOWN,processentry)
var entry:int;
var sum:int;
function processentry(e)
{
trace ("hello "+e.keyCode)
entry = e.keyCode - 48;
sum += entry;
trace(sum);
}
The first 'trace' simply makes clear what's happening when you press a key. We subtract 48 from the keyCode because the ASCII keyCode for '0' is '48' and the other digits' keyCodes go up sequentially. It should be easy for you to adapt this to your own case. Just let your textfield append the current 'entry'. You can put the 'sum' into another textfield or do something else with it.
The idea with my setup is that I have an input text field and three separate buttons on stage. When you type something in the text field and press the input button, the text inside the field is added to an array.
When you press the display button the contents of the array are displayed on screen (each value of the array is displayed underneath the last value).
The final button is supposed to remove all the current values on the array, and clear all displayed values on screen. But I cannot get my code to work as intended, since I receive,
TypeError: Error #1009: Cannot access a property or method of a null object reference.
With this block of code:
import flash.text.TextField;
import flash.events.MouseEvent;
var myArray:Array = new Array ("");
var tf:TF;
btnInput.addEventListener(MouseEvent.CLICK, txtInput);
function txtInput(event:MouseEvent):void
{myArray.push(txtInput.text);}
btnDisplay.addEventListener(MouseEvent.CLICK, txtDisplay);
function txtDisplay(event:MouseEvent):void
{for (var i:int = 0; i < myArray.length; i++)
{var tf:TF = new TF();
tf.txt.text = myArray[i];
tf.y = 280 + (i * 25);
tf.x = 265;
addChild(tf);
tf.name="test";}
}
btnClear.addEventListener (MouseEvent.CLICK, txtClear);
function txtClear(event:Event){
myArray.splice(1);
if (tf.numChildren != 0){
removeChild(getChildByName("test"));}
}
Alternatively, when I add
var tf:TF = new TF;
It removes only one displayed value on screen. Also I might add, that "TF" is a movie clip in the library that contains a dynamic text field that's instance name is txt. Is the problem only with the last button, or should I change something else as well? I don't know how to make this work as I want it to. I'm pretty new to coding so any tips or help would be much appreciated. Thanks in advance!
In your condition if(tf.numChildren != 0) the tf object is null since you never created it. That's why you're getting the #1009 error.
On the other hand, in order to delete all items you should replace the if (tf.numChildren != 0) with while (tf.numChildren != 0).
I'm working on a match-3 style puzzle game using Flixel, and so I'm working on checking each row and column to see if there is a match at any given time. However, I have 6 different pieces (as of right now) that are active, and each piece is identified by an integer. Given that, I can check, for each and every single piece, by doing something like this:
public function matchingCheck():void
{
if (piecesArray[0][1] == 1 && piecesArray[1][1] == 1 && piecesArray[2][1] == 1) {
FlxG.log("Yay!");
}
}
However, this is rather unwieldy and would basically cause way too much repetition for my liking.
At the very least, I would like to be able to check if the values in these arrays are equal to one another, without having to specify which value it is. At the very best, I'd love to be able to check an entire row for three (or more) adjacent pieces, but I will settle for doing that part manually.
Thanks for your help!
EDIT: Nevermind, my edit didn't work. It was just checking if piecesArray[2][1] == 1, which makes me a sad panda.
EDIT 2: I've selected the correct answer below - it's not exactly what I used, but it definitely got me started. Thanks Apocalyptic0n3!
You could cut down on that code a little bit by using another function
private function checkValid( arrayOfItemsToCheck:Array, value:* ):Boolean {
for ( var i:Number = 0; i < arrayOfItemsToCheck.length; i++ ) {
if ( arrayOfItemsToCheck[i] != value ) {
return false;
}
}
return true;
}
Then you just do this in your if statement:
if ( checkValid( [ piecesArray[0][1], piecesArray[1][1], piecesArray[2][1] ], 1 ) ) {
FlxG.log("Yay!");
}
That does assume all items need to be equal to 1, though. It's still a lot of code, but it cuts out one set of "= 1 &&" for each check.
How about something like this which would tell you both if a match existed and what match it was:
public function checkForMatch():void{
var rows:int = piecesArray.length;
for(var i:int=0; i<rows; i++){
var match:int = checkRow(piecesArray[i]);
if(match > -1) {
FlxG.log("Yay you matched " + match);
}
}
}
private function ckeckRow(row:Array):int{
if(row[0] == row[1] == row[2]){
return row[0];
}
return -1;
}
I'm looking at the as3delaunay library and most of the code is clear to me. This part is not, however (note the line that I put preceded with an arrow):
public function circles():Vector.<Circle>
{
var circles:Vector.<Circle> = new Vector.<Circle>();
for each (var site:Site in _sites)
{
var radius:Number = 0;
var nearestEdge:Edge = site.nearestEdge();
=======>> !nearestEdge.isPartOfConvexHull() && (radius = nearestEdge.sitesDistance() * 0.5);
circles.push(new Circle(site.x, site.y, radius));
}
return circles;
}
For reference, isPartOfConvexHull() is found in Edge.as and looks like this:
internal function isPartOfConvexHull():Boolean
{
return (_leftVertex == null || _rightVertex == null);
}
What does !nearestEdge.isPartOfConvexHull() do? Does that mean that the radius = nearestEdge.sitesDistance() * 0.5 only executes if false is returned from the call to isPartOfConvexHull()? Does that stop execution of any other code?
It is equivalent to:
if (!nearestEdge.isPartOfConvexHull()) {
radius = nearestEdge.sitesDistance() * 0.5;
}
In the following line:
var b:Boolean = expression1 && expression2;
expression2 will not be evaluated if expression1 is false because we already know the final result: b = false.
Now in the following line:
expression1 && expression2;
The same thing happens except the fact that we are not assigning the result to a variable.
And this is exactly what happens in the line you are asking about where !nearestEdge.isPartOfConvexHull() is the first expression and (radius = nearestEdge.sitesDistance() * 0.5) is the second expression.
To extends #sch answer with some explanations (I didn't knew if editing answer to almost double it was ok).
This is based on lazy execution of the interpreter. If (!nearestEdge.isPartOfConvexHull()) is False then there's no need to execute the second part of the AND statement to know it'll be False, then it's left unexecuted. If it's true the evaluation of the complete statement is needed (and then done) to tell wether or not this boolean is True. So this is equivalent to an if statement.
TMHO this is bad code since it's to much condensed and hard to understand.