HI Nasim,
You can save that many numbers in an array. We're talking about 20,000
numbers, and Flash can handle that in an array or a vector.
Yes, you can use one vector and store points in it. As to
re-initializing the Vector, I like to use vect = new Vector(). I think
setting the length to 0 will work, though--it's easy enough to test. I
think you can even reset it by setting vect[0] = null;
Computing the points is pretty fast. Its the drawing that is slow. I'm
going to disagree with Henrik, though. Unless the points are going to
change at some point, I would calculate once and keep it. You can even
draw once, into a sprite, and keep it. I would put it in a data
object, or even a class with public static vars.
If you draw it once, and have it in a sprite you can put on stage,
then it's just a matter of scaling it. If you're going to zoom in a
lot, I would definitely use lineTo() or curveTo(). Otherwise it will
pixellate when you zoom in close.
Bear in mind that you are going to have x values of -10,000, so you'll
need to compensate when you put it on the stage. Still, it is a
doable task.
Cordially,
Kerry Thompson
On Tue, Aug 23, 2011 at 6:07 AM, nasim hhhhh <iranebah...@yahoo.com> wrote:
> Hi kerry
> I think there should be morning so good morning
> i think i should convince my boss that i cant save that number of point in
> aray
> u know ifirstly i wanted to make point and save it and i just draw that point
> what are visible in page to use them in diferent situaion of user activity ,
> my gaph has scale + and -
> i draw visiblle point with scale factor again we need that points to simulate
> pulse train , and have scale until 10^5 or more
> by the way
> about using vector as array is it better to use vector of point type or use 2
> vector of number type???
> is it ok to clear vector by this code vect.length=0
> best regard
> nasim
>
> --- On Tue, 8/23/11, Kerry Thompson <al...@cyberiantiger.biz> wrote:
>
>
> From: Kerry Thompson <al...@cyberiantiger.biz>
> Subject: Re: [Flashcoders] array problem,loop.plot
> To: "Flash Coders List" <flashcoders@chattyfig.figleaf.com>
> Date: Tuesday, August 23, 2011, 12:35 AM
>
>
> Hi Nasim,
>
> You can certainly create an array of 20,000 elements (or two Vectors,
> as I did, with a smaller number).
>
> The problem is, I don't think you can display that many points. How
> big is your stage? I had mine set to 1024 x 768, which is normally
> about as high as you want to go.
>
> You don't need that many points to create a smooth graph, though. Try
> using every 10th point, and either lineTo or curveTo.
>
> To do that, in the part that creates the graph, increment by 10:
>
> // Now draw the graph
> for (x = 1; x<= len; x+=10)
>
> Did you get my second e-mail, where I wrote the class for you? It uses
> lineTo(), which should give you pretty smooth graph with 2,000 points.
> My class isn't bug-free, but it is free, and you should be able to
> make it do what you want. If not, I'll take another look at it in the
> morning (it's after midnight here).
>
> Cordially,
>
> Kerry Thompson
>
>
> On Tue, Aug 23, 2011 at 12:13 AM, nasim hhhhh <iranebah...@yahoo.com> wrote:
>> Dear Kerry
>> Hi
>> I am really apreciate u , one of my bigest problem is when i want create
>> point , my boss want to have an array of point that has distance between
>> -10000 to 10000 or more than it because when the user want scale graph i
>> should use that stoored point to calculate new graph , but the prolem is
>> when i want to store data in array this loop take a lot of time and flash
>> dont do anything until the loop finished , and after 15 s it get me eror of
>> time or hang the program and close it !!!!
>> in my program i should fine soulotion to draw online point plz help me
>>
>> --- On Mon, 8/22/11, Kerry Thompson <al...@cyberiantiger.biz> wrote:
>>
>>
>> From: Kerry Thompson <al...@cyberiantiger.biz>
>> Subject: Re: [Flashcoders] array problem,loop.plot
>> To: "Flash Coders List" <flashcoders@chattyfig.figleaf.com>
>> Date: Monday, August 22, 2011, 3:34 PM
>>
>>
>> Sure. I knew there would be bugs in my code :-)
>>
>> Actually, you have so many points, you probably don't need to use
>> curveTo(). lineTo() would probably work for you, and it just takes two
>> parameters.
>>
>> Here's a class I wrote that draws something. It's probably not what
>> you want, but it works, at least. You can take it from here. (I
>> created this class in a Flex AS3 project--that's why I defined the
>> stage size in line 6. If you do it in Flash, you won't need that--just
>> set the stage size to what you want).
>>
>> Cordially,
>>
>> Kerry Thompson
>>
>> package
>> {
>> import flash.display.Sprite;
>> import flash.display.Graphics;
>>
>> [SWF(width='1024',height='768',backgroundColor='#FFFFFF',frameRate='24')]
>> public class GraphTst extends Sprite
>> {
>> private var pointX:Vector.<Number>; //vectors are much faster than
>> arrays
>> private var pointY:Vector.<Number>;
>> private var ndx:int = 0;
>> private var len:int;
>>
>>
>> public function GraphTst()
>> {
>> init();
>> createPoints();
>> drawGraph();
>> }
>>
>> private function init():void
>> {
>> // You have to create the vector in a new code line
>> pointX = new Vector.<Number>();
>> pointY = new Vector.<Number>();
>> }
>>
>> private function createPoints():void
>> {
>> // first fill the vectors
>> for (var i:Number= -100; i<100; i++)
>> {
>> pointX[ndx]=i + 100;
>> pointY[ndx]=5*Math.sin(20*i);
>> ndx++;
>> }
>> }
>>
>> private function drawGraph():void
>> {
>> // prepare to draw the graph
>> graphics.lineStyle(2, 0X000000); //set the line to 2 pixels
>> wide, black
>> len = pointX.length - 1;
>>
>> // Now draw the graph
>> graphics.moveTo(pointX[0], pointY[0]);
>> for (ndx = 1; ndx< len; ndx++)
>> {
>> //trace("ndx: " + ndx);
>> graphics.lineTo(pointX[ndx], pointY[ndx]);
>> }
>> }
>> }
>> }
>>
>>
>>
>>
>>
>> On Mon, Aug 22, 2011 at 2:08 PM, nasim hhhhh <iranebah...@yahoo.com> wrote:
>>> Dear Kerry
>>> I 'am really appreciate u ,but the first problem that i didnt use curve to
>>> is it's parameter
>>> it needs 4 parameter and i cant guess how to define curve point
>>> do u have any idea plz tell me
>>>
>>> --- On Mon, 8/22/11, Kerry Thompson <al...@cyberiantiger.biz> wrote:
>>>
>>> From: Kerry Thompson <al...@cyberiantiger.biz>
>>> Subject: Re: [Flashcoders] array problem,loop.plot
>>> To: "Flash Coders List" <flashcoders@chattyfig.figleaf.com>
>>> Date: Monday, August 22, 2011, 9:41 AM
>>>
>>> Gerry and Henrik have the right answer. Your computer monitor isn't
>>> capable of displaying 20 million points, and Flash will hang, as you
>>> have found out.
>>>
>>> This is untested e-mail AS3, but I would do it something like this:
>>>
>>> var pointX:Vector.<Number>; //vectors are much faster than arrays
>>> var pointY:Vector.<Number>;
>>>
>>> // You have to create the vector in a new code line
>>> pointX = new Vector.<Number>();
>>> pointY = new Vector.<Number>();
>>> ndx:int = 0;
>>> len:int;
>>>
>>> // first fill the vectors
>>> for (var i:Number= -10000 ;i<10000;i+=.1)
>>> {
>>> ndx++;
>>> pointX[ndx]=i;
>>> pointY[ndx]=5*Math.sin(20*i);
>>> }
>>>
>>> // prepare to draw the graph
>>> graphics.lineStyle(2, 0X000000); //set the line to 2 pixels wide, black
>>> graphics.moveTo(pointX[0], pointY[0]); // move to the starting point
>>> len = pointX.length + 1;
>>>
>>> // Now draw the graph
>>> for (x = 1; x<= len; x++)
>>> {
>>> graphics.curveTo(pointX[x], pointY[y];
>>> }
>>>
>>> There's more you have to do--importing the graphics package, perhaps
>>> putting this all into a class, and so on. There are probably minor
>>> bugs in the code you'll have to fix--this is just off the top of my
>>> head. I think you will be much happier with performance and appearance
>>> with something like this, though.
>>>
>>> Cordially,
>>>
>>> Kerry Thompson
>>>
>>> On Mon, Aug 22, 2011 at 4:49 AM, nasim hhhhh <iranebah...@yahoo.com> wrote:
>>>> but the most problem is for loop i think flash dont do any thing until the
>>>> loop finishde
>>>> i need to use smal step because if the step is big the graph will be show
>>>> like line to line , it s ugly graph
>>>> and the distance that i use for loop is more importatnt for me i want to
>>>> show 2*10^8 distance / i want to make point in my program and plot it one
>>>> by one i make i plot
>>>> i make i plot
>>>> is there better way?
>>>
>>> _______________________________________________
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>>
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