ActionScript 3.0 :: Calculating Points Along A Curved Path
Dec 23, 2009
I'm developing some kind of dynamic time line. I want a curved line to represent time and dynamically put points over the curve representing the years. Maybe even have a slider along that curved line. I was thinking of creating the curve at runtime with bezier so that each time it would be different. Adding the slider is easy.... but I really don't know where to start for putting movieclips along the curve dynamically.
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Dec 27, 2011
I am developing a game for mobile in AIR (as3). I have created some bots for this game that initially just wander around. But when a bonus enters the stage, they have to move to the bonus.The detection of a new bonus and moving of the bots works fine, but there is something wrong with the manipulation when a new bonus enters the stage.Basically, this is how it works (or I try to make it work):My bot moves along with his rotation as a parameter. (works fine)
private function moveToNextLocation():void
{
var angle:Number = _rotation * 0.0174532925; // 1 degree = 0.0174532925 radians
var speedX:Number = Math.sin(angle) * _speed;
[code]....
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Oct 3, 2011
I have been tasked with trying to create a drawing tool that draws dotted lines as you drag the mouse across the stage. I can easily capture the points on MouseEvent.MOUSE_MOVE and store them in a vector and then draw the points as dots:
The problem is that I need to calculate evenly distributed points on an ever growing Vector of points so I can only draw the line between say every 5th point (say using modulus). I have been battling away with Bezier curve equations both Quadratic and Cubic but still can't quite figure out how to convert my Vector of points into an evenly distributed Vector of Points without sucking the life from the CPU.
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Aug 31, 2011
Is it possible to draw out a path in the flash editor, set its visibility to hidden, and use this path data to animate objects in AS3?
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May 10, 2011
I am trying to draw a continuous curved line in flash. There are many methods but none of the ones I have found so far quite fit my requirements. First of all, I want to use the flash graphic api's curveTo() method. I DO NOT want to simulate a curve with hundreds of calls to lineTo() per curved line segment. It is my experience and understanding that line segments are processor heavy. Flash's quadratic bezier curve should take less CPU power. [code]...
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Oct 6, 2009
I want to draw a curved line between random point. How can I do this? The random points are actually x,y positions of movie clips dragged on the stage and I want to code curved lines between them.
Im looking at curveto in as2 but not sure how to to do it?
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Mar 2, 2011
I want to drag a object along a curved path , the curve is made up of 50 points(x,y) and I want to display the corresponding (x,y) coordinate of MC.
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Sep 30, 2009
As the topic indicates, i'm trying to create a curved path and make a movieclip follow that path up and down with a bit of rotation.
This could easily be done animating the timeline, however I need this to be done through pure AS - as when I mouseOver the MC, the MC need to stop and go to the top. [url]...
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Dec 5, 2011
Flash AS2, AS3, and so on have many limitations. For example it is almost impossible to do transitions from a straight path to a curved one and vice versa for example as required in a in a car race game. You may have go for a frame by frame animation which is very cumbersome.
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Nov 22, 2011
i have a small challenge calculating and evaluating a predefined path
here is my challenge in short.
- i got a path as a single color line on a white background (bitmap object but could as well be a vector shape)
- the path is a closed loop path (like a twisted and bend circle, let's call it a bean shape).
- i then need to move an object along this path in x steps but only once and stop exactly where it started
This means, i need to:
- find a start end point
- calculate the length of the path
- set keynodes along the path with X amount of spacing between (length/x)
- it got to be semi precise (within 1-2 px.)
one idea could be to loop throught the pixels till to find a color pixel and use this as the starting point, then use an vector with a predefined length (ex. 5 px) "rotate" it till it find a new color pixels and mark this as a new node, repeat the process till you get close to the starting point, and by using Trial and error you'll eventually have mapped the path, but this method is clumsy and not very accurate, if you don't hit the starting point spot on the first time, you'll recalculate everything over again.
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Jul 28, 2010
I'm trying to find a way to calculate the area of a polygon using lat long coordinates in a Flex 3 site. Hong007 on Google Maps for Flash group was cool enough to post the following function:
[Code]...
I was also playing around with the area calculator at [URL]. These functions produce slightly different results. I'm trying to figure out which one is more accurate. It seems that hong007's function produces results that are on average slightly larger than freemaptools' function. However, I don't know which one is more accurate.
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Aug 31, 2011
Is it possible to draw a path in flash, and access the points from AS?For example if I have a map and I add hidden paths along various roads, I then later want to animate traffic or growing lines along these predefined paths from code.
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Feb 12, 2012
Is there any easy way to get a path (a sequence of points) from the flash IDE into actionscript code?for example if you want to draw an outline for a gameworld that you want to use as collision object and now in AS3 you'd like to get the vertices of that path you drew.
what i did so far was to create a lot of dummy movieclips, place them on the vertices of the drawin path and call them "dummy01","dummy02","dummy03" and so on, and then in AS i iterated over the children and rebuilt the path that way
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Aug 22, 2010
I'm working with Senocular's Path.as file and I notice that the points that it outputs on curves are not very accurate. [URL] The code has a variable for curve accuracy in there and I have tried changing it but if I set it to 1 or to 500 it doesn't effect the placement of objects on the curve.
Basically what I am doing is putting beads on a necklace and pushing them through a curve. Kinda like in the game Zuma. However when I set the positions of the beads to go up incrementally there seems to be a slight burst of speed on the curves, that speeds up at the ends and slows in the middle a little. I was wondering if anyone had any pointers on how to make the curves more accurate with this script? It is a hell of a good script by the way I'm sure I'm just stupid and not seeing something.
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Jul 18, 2010
So I've created a script where a mc is clicked on and the player can draw a path using the mouse. I'm trying to figure out how I can get the mc to follow the path drawn out by the player's mouse and when the player clicks again, it erases all of the path.my code is below
Code:
import flash.display.Sprite;
import flash.events.MouseEvent;[code].....
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Nov 9, 2011
the same class is passed to the mxmlc compiler in SWF library as a symbol linkage class and again in a source-path. But the compiler uses the definition from the source-path so creating new instance of that class won't create new instance of the library symbol. How do I tell the compiler to prefer the definition linked to the symbol (the one dfrom SWC)?
I have my design assets in an FLA file and they are linked to classes (e.g. [URL]. Then I export those assets to a SWC library and pass it to the compiler. Now when I create an instance of the class (new MyAsset();) it will be a new instance of the library object.
But there are other classes too in the source folder (e.g. "com.myproject.model.*" so I need to pass the source folder to the compiler too. And that is the problem, now the compiler will use the MyAsset.as definition from the source path, not from the SWC where it is assigned to the library object so if I create new instance of MyAsset now it won't duplicate the library object.
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Nov 24, 2004
Here's what i'm trying to do: Hide a MC depending on the path variable as:
[Code]...
Well that doesn't work, for some reason, i can't use a string as a multiple level path..
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Feb 15, 2010
I was wondering if it possible to write up some AS that will take line paths that you have drawn and convert them into a Path object? For example say you drew a jagged line from left to write, would there be a way to have AS convert that into a Path object.
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Aug 27, 2004
i have a quick question what is the syntax if u want to use parametrs to define a path inside a path? i mean:
[CODE]...
does anyone know.... it's very important!
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Mar 7, 2004
I mean i need to make a text to follow a curved line, something similar we have in photoshop. How do i make that here? I need to write a 3 words sentence which will be placed above and below a circle. Circle contains a logo, but i need to write the text, but it needs to be rounded as well. I don't want to break apart and rotate EVERY letter in those 3 words.
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Nov 9, 2011
This is a head scratcher. Why would a root relative path cause a Security Sandbox error.. but an absolute path to the exact same path work fine..
[Code]...
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Jul 16, 2009
I'm trying to draw this hint box and was wondering if anyone could explain to me how to draw a curved line like the one below in flash?
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Jan 10, 2011
I want to 9 scale the line in the shape of 'U' so that i can increase the width in a manner that the rounded corner of the line not got spoiled and I also want to resize (in proportion) it without spoiling it's rounded corner. Right now I have done it in the distinct files but I want to do these both properties in a single file.
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Jan 5, 2010
I have a circle component in my application , divided into 4 sectors. My circle component is such that I have an outer circle and an inner circle, with a small gap between the two circles. Now I want to place the curved text in this gap for the four sectors, curving along with the circle.. How do I achieve this?This is my circle component:
package components
{
import mx.core.UIComponent; the circle.
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Feb 21, 2012
I'm making a game with a health bar and I am trying to make a health bar that is curved.Currently I have a lineBar that has 20 segments that looks like this at the bottom left of the screen.What I'd like to do is write a function that goes through and modifies the scaleY of each to get a curved bar.I can easily scale them down in a straight line. So that it looks triangle ish
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Dec 12, 2009
Any idea on how to curve a line and bend the texture along with it?I tried lineBitmapStyle with curveTo, but that doesn't bend the texture.I was thinking of using a for loop to draw the curve using lineTo, and using a matrix to rotate the lineBitmapStyle...but it isn't working out to well.
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Jun 4, 2004
how to make a scrollbar that goes along a curved shape?
You can download a png of the shape I'd like to scroll along. (the edge)
[URL]
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Sep 14, 2006
I have a curved graphic that I need masked, but the mask will slowly unveil the graphic below. I'm tweening the mask on the timeline since the graphic has a pretty complex shape (a bunch of curveTo's would take forever).If I apply a shape tween to the mask it doesn't tween on curves that well unless I place a keyframe at every two frames and adjust the shape. Does anyone know if there is a better solution?
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Jun 4, 2004
Anyone know how to make a scrollbar that goes along a curved shapeYou can download a png of the shape I'd like to scroll along. (the edge)[URL]
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Dec 24, 2004
I need to attach a series of mcs to a curved line. These mcs are attached through actionscript with the attachmovie code, they do not tween, just attach at intervals one after another. Its hard to explain i know. When the user presses a button on the screen the first mc appears at the start of the curve, another press attaches another mc perhaps 10px inwards on the line and so on.
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