ActionScript 3.0 :: Finding A Point Relative To A Center Point?
Nov 9, 2010
I'm trying to figure out how to find a point relative to the center of an object, modified by its rotation. For example, in the attached swf, I've been messing around trying to draw trails to a bitmap, coming out of the thrusters. I didn't have a problem at first, but as the ship rotated, the lines that were being drawn wouldn't remain relative.
http:[url]....
I'm sure this is because I have no idea what I'm doing, and I've just been sort of idioting my way through it. That aside, is there an easy way to find the point I'm looking for? For instance, say I want a point at Y -14 of my ship, but I want that to remain relative to the ship as it rotates.
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Jan 8, 2012
All though I can scale down the size of my objects and can shift them to their correct positions when scaling. I cannot shift them to the correct relative positions, relative to the screen centre.
Code:
level=1; //starting scale level
public function scaleOut(level:int) // scale to a level 1-4{
for (var r = 0; r < Main.ballArray.length; ++r){
// scale radius
Main.ballArray[r].bRadius *= (oldLevel / level);
[Code] .....
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Sep 16, 2011
So let's begin. I want to build a wheel which you can spin, similar to a roulette wheel. You can do this both ways (CW and CCW, this issue causing the bug, actually). The wheel has some acceleration to it too, and I achieve this by measuring the start and final angle of the drag movement, using Math.atan2(dy, dx). The problem is the following: atan2 outputs the following angle scheme, assuming the point relative to which the math is done is in the center of the circle.
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Dec 31, 2010
i was wondering if there was something that allowed you to grab any 2d point that exists inside a movieclip and grab the 3d position of that exact point...
for example i have a rectangle movieclip on the stage .. and its rotate on the x axis 75 degrees.. registration of the clip is at bottom middle.. so when it rotates the bottom stays in the same spot and everything rotates around it..
now what if i wanted to know the exact x,y,z of the top edge of the clip..
is there a function similar to localToGlobal that would take the x,y coordinate inside the clip and spit back a global 3d point .. (i guess its called a Vector3D)
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Aug 30, 2009
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Aug 8, 2011
[Code]....
two balls are stationary on stage and I am dragging ball 1 between them. I want my program to deny the ability to do this (technical terms) and move the ball automatically to the closest point available that does not overlap either of the other two balls i.e. the left side of the dragged ball may touch but not over lap ball 3. I have a feeling the circular equation: (x-a)^2 + (Y-b)^2 = c comes into it but it may need pythagoras instead as the balls are all circular but not all the same size. The best way I can see for this is to write a multi-part equation for the bounds of boths balls and then finding the nearest point, but not sure how to do this in as3, perhaps using the 'for each' tag.
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Oct 20, 2009
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Jul 9, 2010
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Aug 26, 2010
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how to do an effect like the one seen on this page?: http:[url]....
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Dec 1, 2010
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Apr 7, 2011
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Mar 28, 2010
Can I set the registration point of a MovieClip (or other Display Object) to its center upon creation in AS3? the following
[Code]...
sets the registration point of myClip to its top left corner by default. Using Flash CS4 to set it to its center is just a couple of clicks, so I am wondering how I can perform the same action only with code.
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Aug 9, 2011
I searched online and found this script that is supposed to rotate and image but I'm not sure how to use, where to put in the degree angle that I want my sprites to rotate by. Also, I get an error. 1084: Syntax error: expecting identifier before leftparen. 1084: Syntax error: expecting rightparen before leftbrace.
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function rotateAroundCenter (ob:*, angleDegrees) {
[Cde].....
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Jan 30, 2012
I'm trying to rotate a point in my Canvas from a given point (center). In my MouseDown handler, I save the point where user click (oldPos), and in my MouseMove handler, I'm doing this:
private function onMouseMove(event:MouseEvent):void
{
// Where the user pointer right now
[code]......
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Dec 28, 2010
How Can i Set registration point to to the loader at the center by using as3 ?
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Sep 8, 2011
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Dec 1, 2007
I'm trying to use Zoom transition for my photo Gallery which I'm using loadMovie "jpg" from Xml file.Now the problem is here. The Registration Point is set to the top upper left corner and I would like it to be in the center of my loadMovie.The Zoom transition only zoom from left corner and need to be center equal sides. How do I do this. My image size is "width 400px height 240px
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Mar 9, 2009
I am trying to rotate some points around the center of the circle(0,0), however I'm getting weird values from the output. I've commented the problem code..
Code:
var r:Number = 10;//radius
var y:Number;
var x:Number;
var a:Number = 90;//angle of which the semi-circle is facing.. could be a random angle.
var ax:Number;//rotated points
[Code] .....
I am using the semicircle in BitmapData collision checking with getPixel(), with a moving circle...
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Nov 16, 2010
I'm making a 3D room builder. The user places Sprites around the 2D stage and my script converts those Sprites to Papervision3D DisplayObject3D objects. I'm having problems with the 3D object positioning because Sprites have registration points at their top-left corner and 3D objects have registration points at their center. How can I make that conversion?ere's a scheme of how the 2 different coordinate systems work:
I've tried this code:
child3D.x = child2D.x;
child3D.z = child2D.y - child2D.y - child2D.y; // just to make it negative
[code]....
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Feb 1, 2010
Using the new 3D features in CS4. I know you can change the 3d center point manually via the Transform panel, but does anyone know how to do this dynamically at runtime? (ie via code)
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I'm trying to Resize a panel using a Resize Effect using its center as the anchor point. I've been googling for some information and the only thing I have found is to set the horizontalCenter and verticalCenter to 0, but this is not working for me. The panel keeps resizing from top/left corner.
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Oct 27, 2011
I've created an mc which functions as my map and controls to go with that which allow the map to be moved around and key points navigated to and zoomed in on at varying zoom levels.I'm using scaleX and scaleY to scale the map mc and a list of x and y positions to correctly position the map for each key point.When I want to go to a certain area I perform this calculation (offsetX and offsetY are the center of the screen):
newX = posX * scale + offsetX;
newY = posY * scale + offsetY;
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var tween = new TweenLite(_background, EASING_SPEED, {x:newX, y:newY,scaleX:scale.getScale(),scaleY:scale,ease:EASING_TYPE,onComplete:moveToComplete,onCompleteParams:[room]});
I now need to implement a zoom in / out function and this is what I'm struggling with. The zoom should use the center of the screen as the reg point for the scale, so I've been trying something along the lines of the following to get the correct positioning:
var newX = offsetX - (offsetX - _background.x) * scale;
var newY = offsetY - (offsetY - _background.y) * scale;
So in my mind this gets the distance from the current position of the map relative to the center point of the screen (offsetX, offsetY) then scales that distance by the new scale. However, this is clearly wrong because it's not working and the positioning of the map is wrong.I've also tried using a transform matrix to get the correct values but I know even less about them and not got the right results.
function scale(target:MovieClip, center:Point, scale:Number):Point {
var m:Matrix = new Matrix();
m.translate(-center.x, -center.y);//move the center into (0,0)
[code]....
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Dec 6, 2009
How to find out different circle's center point of a bitmap?
just like photo above, how can i locate the 2 center points of circles?
i only know using .getColorBoundsRect to get a point, but this only apply to one circle, in fact i wanna get different points according to the bitmap.
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Dec 1, 2010
I'm trying to add some zooming functionality. The problem is that when you zoom in and out, it scales the MC up and down from where the registration point is. This means That when I'm far from the position of the registration point instead of zooming the in straight it also makes it appear as if you are travelling towards the registration point.
To offset this effect I want to calculate the amount of pixels I need to offset the Map by so that it appears as if you are zooming in directly.
So just as a test I've put a little ball inside the map(called "center") which I'm trying to keep in the center of the map.[code]...
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Dec 9, 2010
Is there a way to use the scaleX and scaleY property in conjunction with the Tween class to scale from the center?ActionScript Code:[code]above unfortunately only scales from top left. This is not a class I can go in and move all the content by hand (so that the registration point is in middle) as it's all dynamic. I've looked al over but none seem to make use of the Tween class.
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Jun 14, 2011
I draw a shape,like follows:
var shape1:Shape;
shape1=draw();
addChild(shape1);
shape1.rotation=50;
[Code]....
Then I want to rotate the shape at it's center point(200,202) by using shape1.rotation=50,but I find the shape don't rotate at the the center of it's shape. How to realize the function which make shape rotate at its center point?
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Jul 11, 2003
I start with a question: how could I change the registration point of a movie clip created or loaded at runtime? I want to move the registration point from top/left to center.
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