ActionScript 3.0 :: Matrix Transform - Rotate Object Around External Point
Oct 14, 2010
I found the function:
rotateAroundExternalPoint(m:Matrix, x:Number, y:Number, angleDegrees:Number)
to rotate an object around an external point. The top of the object will always point at the center point which is exactly what I want.
It works fine but its possible to rotate it in an oval instead of in a perfect circle...I think it should be something with the angleDegrees Parameter but im not sure what to do with it. I also tried to set up an own matrix but I failed. Any right direction to orbit an object in an oval, and where the top of the object always point at the rotation center?
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Jun 22, 2011
my problem is that if i scale, rotate or translate a display object using its transform.matrix i am not getting the value in the display object but the transform is happening like displayObject.scaleX or displayObject.scaleY etc. i get this new transform value using the dislayobject? as i am using a matrix transform manager which actually changing the transform matrix of the display object.
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Jan 28, 2009
i want to assign a transform matrix to an object, but i want to assign the values myself (as in, no 'rotate, scale etc'), but for example, set a matrix like
[Code]...
which if applied, would have no effect, but would be valid (actually not exactly that matrix, but you get the idea). i want to set the values of the matrix and the object should be affected by those values that i set by myself, no scale rotate or any predefined operations. how can i set my own matrix?
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Aug 25, 2010
Okay so I have two import pieces of code involved in this. This first tiny bit is what creates an object called OBJECT_arrow. It is located in the main function of my main class[code]...
It isn't really all that important. Now this next bit is the OBJECT_arrow class. What it does is loads an external png image and draws it. [code]...
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Dec 13, 2009
When motion tweening is it possible to have an object move from point A to B and also have it rotate at certain points?
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Dec 29, 2010
I ran into an issue with an app that I have been working on.The application lets a user draw a rectangle, which base class is UIComponent, on an SVG Canvas. The user can rotate, skew, scale,flip horizontal and flip vertical the rectangle. Then they can drop an image into the rectangle.We just cloned the rectangles matrix and applied it to the image and the image would transform the same as the rectangle. Well now we have changed the way the app works.
Now we don't want the image rotated or flipped on the initial drop, and this is where I'm having trouble.I was wondering if there is a way to always find the true top left of any rectangle no matter what kind of matrix is placed on it. I can find the center of the rectangle but when a user flips the rectangle the center point is outside the rectangle.Instead of finding the center I would like to find the topLeft.I have tried several things. Like transform.pixelBounds, but this gives me big numbers like 2200 instead of 400. I have also looked at senocular.com but not sure that I understand it.I just need a dynamic way to always find the top left.
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Jun 19, 2009
This is one of the threads that was deleted. I've come up with the same problem: how do you go about dragging an object around a fixed point (rotation)?
I can do a normal drag & drop, but with this i don't even know where to start
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Jul 2, 2009
I have problem when dealing with transform in Flash cs4 ....When I rotate my movieclip and trace the output, my movieclip's width also changed....
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Aug 13, 2010
I have a class which extends the Sprite object in as3. I need to be able to override the transform.matrix setter in this class but haven't been successful in doing so.
I've tried many things, along with creating my own separate class which extends the Transform class and then overrides its set matrix function, and set my transform = new CustomTransform(). Sadly this didn't work.
In code this is what i tried:
public class MyClass extends Sprite
{
public function MyClass()
{
[Code]....
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Dec 10, 2009
Im using Daniel Gasienica's Zooming in Flash where he uses the transform matrix to calculate the mouse position so the zooming reference point is the same. Its pretty handy, but i need the zoom to more smooth. I've tried almost everything (mainly the TweenLite engine), but with no luck.
[Code]...
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Nov 10, 2010
I am having quite a bit of trouble with one of my classes not working with the custom PixelPerfect-Class. Looking into it I found the error occurring in this line:
Code: Select allbM:Matrix = objB.transform.matrix.clone();
It's throwing a 1009. Playing arounf with trace I have come to the point, that the hero in my little game has no transform.matrix (it's null). This is not related to the CollisionClass, i traced it independently of that.
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Oct 18, 2010
I have a UI component that I wish to relocate and scale, but in a rather complex way. I've figured out the necessary transformations using the transform matrix, to which I applied several translate and scale operations. I can set the new transform matrix for this UI component to be the above calculated matrix, and the results are accurate; but I need to animate the transition. I can't use the Scale/Move effects alone because they aren't as powerful when it comes to calculating the necessary transformation as the matrices are.So how can I animate the transition of an object given a source and a target transform matrix?Figured it outUsing a tweener and its onUpdate event to reassign the matrix with each intermediate value:
var animMatrix : Matrix = gi.transform.matrix;
TweenMax.to(animMatrix, 1, {
a : m.a,
[code]......
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Jun 29, 2011
I'm working on a project wherein a user can take a snapshot of themselves using their webcam and then edit this image by transforming scale and rotation and save the result.
I've got most of it working, the user can take a snapshot of themselves, transform the object using Senocular's Transform Tool and i'm using .draw() to then save this transformed object. The problem is .draw() is only grabbing data from the top left corner of the stage. It is drawing the transformed object but only from the top left corner.
Why does it only draw from the top left corner and how can i get set the coordinates to only draw from the area where the captured image is set?
You can view the file as is at: [URL]
And i've zipped the FLA and relevant classes at [URL]
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.Sprite;
[Code]....
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Jul 8, 2011
someone could tell me how I can zoom a Canvas, with transform.matrix, so that the content of the component fits into the parent container (application), either inward or outward
this function is called Zoomfit(), I have this code:
[Code]...
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Jun 29, 2011
Long time since i've been on here. I'm working on a project wherein a user can take a snapshot of themselves using their webcam and then edit this image by transforming scale and rotation and save the result. I've got most of it working, the user can take a snapshot of themselves, transform the object using Senocular's Transform Tool and i'm using .draw() to then save this transformed object. The problem is .draw() is only grabbing data from the top left corner of the stage. It is drawing the transformed object but only from the top left corner. Why does it only draw from the top left corner and how can i get set the coordinates to only draw from the area where the captured image is set?
[Code]....
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Apr 14, 2011
I'm having trouble with Matrix Transforms in Flex.
I have a Flex Canvas with nothing but an Image in it, like so.
<mx:Canvas>
<mx:Image id="img" source="/some/Url" />
</mx:Canvas>
[Code].....
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Jun 26, 2009
I'm having trouble with loading in an external image that I can transform with the Senocular Transform Tool class. I have managed to load in the picture but the transform class doesn't seem want to grab it. Eventually I want to us the FileRef to upload the image but I just need to figure out how it works first. Here my code to load in the external image
[Code]...
The transform class can grab the other movieclips but it doesn't want to grab the new image loaded in from the code above.
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Mar 4, 2010
I have the starting point of a rectangle, and the rotation of the line that I would like this rectangle to be parallel to. My initial thought was to create a Rectangle() then rotate it, but there doesn't seem to be an easy method rotate a rectangle. From this rectangle I create I can obviously get the four points, but I need these to be adjusted based on an angle of rotation that I pass it.
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Jan 24, 2010
How can I rotate an Image eg. 180 degrees clockwise using the Matrix. I can use the following code to rotate the image 90 degrees, but it is incremental, meaing
var matrix:Matrix = new Matrix();
matrix.rotate(Math.PI/2);
matrix.tx = imgControl.content.height;
var bitmapData:BitmapData = new BitmapData(imgControl.content.height, imgControl.content.width);
bitmapData.draw(imgControl.content, matrix);
imgControl.source = new Bitmap( bitmapData);
[Code]...
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Dec 6, 2011
When I try to rotate using Gradient transform tool, I can't rotate my gradient 45 degrees or 90 degrees. nap to objects is enabled and holding shift also doesn't work.
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Nov 19, 2010
I have an odd problem in CS4/AS3 with one of my flash files where text is incorrectly rendered if the movieclip containing the text has a 3d matrix transform and quality is set to medium or low. It is easy to reproduce:
[Code]...
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Aug 3, 2010
My Text is visible before rotating it to verticle position using Free Transform Tool. But when once it is rotated to verticle position the text disappears from the Stage. And it is not an animated Text as well?
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Jun 16, 2010
I am doing a matrix transformation on a Display Object. I got this function from another site, but basically it scales a display object around any point.
ActionScript Code:
public static function scaleAroundExternalPoint(m:Matrix, x:Number, y:Number, multiplier:Number):void{
m.translate(-x, -y);
m.scale(multiplier, multiplier);
m.translate(x, y);
}
But my problem is that I have to do multiple scales in a sequence and after scaling, the points defined in the XML no longer correspond. Let me first say that all the points being scaled around are located in an XML file. They are all relative to the display object's registration point (0,0) when it is normal, i.e. a scale of 1. Also, I have created a class that retains the target object's original Matrix so that the percentage you pass in is relative to the original scale instead of the scale after each call. But basically, with the scaleAroundExternalPoint function by itself, if I have an object that I scaled to twice it's size, the multiplier would be 2. but say I want it back to it's original size. The multiplier would NOT be 1 since that would just leave it at a scale of 2x. It would have to be .5. The important parts of the class are below.
ActionScript Code:
public function ZoomUIComponent(isKeyboardControlled:Boolean = false, disabledAlpha:Number = .25,
max:Number = 2, min:Number = .5, precision:uint = 2,
seconds:Number = 1, step:Number = .1):void{
this.disabledAlpha = disabledAlpha;
this.inControl = InteractiveObject(getChildByName("zoomIn"));
_isKeyboardControlled = isKeyboardControlled;
[Code] .....
It's retaining the original matrix and then calculating based on that EACH TIME. So how would I find the new X and Y values of the original points so that I can scale around them?
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Mar 5, 2010
I have a slider which I want to use to rotate an image around it's center. This normally is easy but my problem is the clip is made dynamically and the size changes so I can't use the default registration point and I need to assign the center point before I rotate it. I found the rotateAroundExternalPoint function which rotates around a center point fine. How to get it to rotate to a certain angle and then have it stop at that angle. The rotateAroundExternalPoint increments the rotation rather then allowing me to set the angle to rotate to. Is there anyway that I can set what angle to rotate my clip to? It right now increments the rotation by the x coordinate of my slider bar (slider_position.x).
Code:
import flash.geom.Matrix;
import fl.motion.*;
var mat:Matrix = clip.transform.matrix;
addEventListener(Event.ENTER_FRAME,EnterFrame3);
function EnterFrame3(event:Event) {
var center_point_x = clip.height / 2
var center_point_y = clip.width / 2 //
MatrixTransformer.rotateAroundExternalPoint(mat,center_point_x,center_point_y,slider_position.x);
clip.transform.matrix = mat;
}
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Jul 16, 2010
I am trying to scale a movieclip with AS3, but always using the center of the stage as the registration point. The movieclip is larger than the stage to begin with, and uses a slider component to slide back and forth. I'd like to be able to scale the movieclip using a button, but it currently uses it's own registration point (upper left corner) as the source.
Is there a way to force the scale to use the center of the stage?
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May 20, 2011
The 3D rotation properties (rotationX, rotationY, rotationZ) all revolve around the objects registration point. Is there any trick to change where the rotation center is?
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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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Apr 1, 2007
Is it possible to make a movie clip rotate about the center point of it using the ._rotation method?
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Aug 14, 2003
i dont know the math to have a mc rotate around a central point by constricting to an arc..i have a circle and i want a mc to follow around the edge depending on the mouse position relative to the center of the circle...
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Nov 11, 2002
I have a triangular symbol that I want to rotate on a transformation point (the pointy tip). The effect is supposed to be like Hollywood searchlights panning around (see pic below). I've done basic rotations with actionscript before, but a transformation point wasn't involved. How is this done? Is the transformation point determined manually on the stage or with actionscript?
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