I am looking for a way to find a vector if I know one point and 1 angle. Like I have A(x, y) and a vector starting from A(x, y) with an angle. I would like to know the position on a point X (x, y) that can be anywhere on that vector. I only know the coordinates of A and the angle. Possible?? I guess it has to be a function...
View 5 RepliesI know some basic trig. but how do i find an angle from an anchor point and a moving point?
adjecent = _root.anchor._x-_root._xmouse;
opposite = _root.anchor._y-_root._ymouse;
hypotenuse = ((adjacent ^ 2)+(opposite ^ 2)) ^ 0.5;
I'm not a genius in geometry, I'd like to find a point in as3 with the radius and a angle but I don't remember the rule, I know this should be simple!
View 3 RepliesI'm drawing a 3D pie chart that is calculated with in 3D vectors, projected to 2D vectors and then drawn on a Graphics object. I want to calculate the most left and right point of the circle after projected in 2d. (So not 0 and 1 Pi!) The method to create a vector, draw and project to a 2d vector are below. Anyone knows the answer?
[Code]...
if i have a movieclip or a sprite could i find (via code) where is its registration point compared to its top left point (no rotation included) ?
View 4 RepliesSay for example I have a ball and I would like to move it towards a specific angle and a specific magnitude I would use something like:
[Code]...
Now if I wanted to change this force, for example, add a force to it, say, with magnitude 0.5 and angle 20, how would I do that?
What I've done so far is using your mouse you (click & release) you shoot a ball off in that direction using radians. Now what I'd like to happen is when the ball hits the wall it bounces off in it's reflection angle. Eg. if the ball hits the right-hand-side wall travelling at in a radians of -0.65 it should bounce back in the radians of about -2.5
View 3 RepliesHow can we find out a moving movie clip's angle. I'm trying to make a shooting game in as3, I need to know the angle of the movieclip(bullet) when it gets hits on the wall. i.e., I have a movieclip named "ball", and which is moving with some speed and the coordinates are initially created by the gun's positions.
Code:
var angle:Number = gun.rotation - 1;
var bubbleX:Number = gun.x-130* Math.cos(angle * Math.PI / 180);
var bubbleY:Number = gun.y-130 * Math.sin(angle * Math.PI / 180);
var ball:MovingBall = new MovingBall();
ball.x = bubbleX;
I need to know, what is the angle of "ball" after it hitting the boundary areas..
I have a set of links (movie clips) arranged in a circle. When one of the links is clicked, I would like the circle of links to rotate until the selected link is in a certain position - straight down (90 degrees) in this case - and the others to maintain their positions relative to the clicked link (ie: they all move, but the distance between them is maintained). The behavior is intended to be like a bullet rotating into a chamber on a revolver, or - more accurately - like that of a Ferris Wheel. [URL] Here is my mangled version of the AS from the site linked above:
ActionScript Code:
// setting variables
var centerX = Stage.width/2; // Stage Center X
var centerY = Stage.height/2; // Stage Center Y
[code]....
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;
}
At the moment I am using two mini objects within the line to calculate the slope of the line I have.
I was wondering if there was some easy function within as3 to find the slope of a line that had been drawn out, if not... I suppose I have my own theories on how to do it, such as checking for hit tests in a circle until I find the line.
how I can count the B point's coordinates (see attached image... or not as I am a new user...pf!). I know the arrow's rotation - so the angle (let's say it is -120), A's coordinates (0, 0) - A is the middle point of the arrow, and that the distance between A and B is 50 px.
View 1 Replieswat's the difference between finding a angle using Math.atan2(y,x) function and by finding using the movie clip's rotation (mc._rotation*Math.PI/180);
View 9 RepliesSo 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.
atan2 returns a value measured in radians, so I'm using the classic angle*180/Math.PI formula. I've changed this original scheme into the following, using some simple math to shift the angles a bit, to resemble more accurate circle angles (going up to 360 degrees) The problem that I'm facing at the moment is should the user decide he wants to swipe clockwise, and moves through the right point, where 0 turns into 360 or 180 turns into -180, the whole angle difference thing is capsized. It registers a CCW movement (as if the user swiped his mouse all around the circle). So, I'm looking for some ideas as to how I can work around this small issue.
I got a working broad phase and collision detection is fast enough.Now my collision response is working, but slow. I have trace(using getTimer()) through the whole resolving method, and I found the slow spot is where I get the collision point and normal vector.
Right now, I test each point on each shape against each line on the other shape. This works nice on triangles, but other shapes, it much to slow.I would think that using SAT(seperating axis therom) would have a way to get this when checking collisions, but I cant seem to get it.I need a fast way to get the collision point and normal vector.(Right now, it takes about 3 milliseconds per collison on a rectangle with 4 points and 4 lines)
Vector Scaling Object Without Affecting the Original Point
View 1 RepliesI need to know the best method to find an item inside a list (Vector, Array, Dictionary, whatever is faster) of complex type (extensions of Objects and Sprites).I've used "Needle in Haystack" method, but it seems that it isn't fast enough.
E.g.Suppose that I have a collection of Sprites (a pool, in fact).Each sprite will be added to the stage and perform some action. After that, it will die.I don't want to pay the cost to dispose it (garbage collect) and create another (new) one every time so I'll keep the dead sprites in a collection.
Sometimes times I'll call a method that will add a sprite to the stage.This sprite can be a old one, if it is already dead, or a new one, if the pool don't have any free sprite.
One of the scenarios that pushed me to this question was a Particle System.A "head" particle leaving a "trail" of particles every frame and exploding into a flashy multitude of particles... Every frame...Some times this counts up to 50.000 PNGs with motion, rotation, alpha, event dispatching, scale, etc...But, this is JUST ONE scenario...At the moment I'm trying to use a Object Pool with a Linked List...Hopes that it will be faster that running a whole Array/Vector or create new instances every frame an let them dye with Garbage Collection.
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]....
i am trying to find center point of my pie.
var myTween:Tween = new Tween(piechart,"............", Strong.easeOut,1200, 510, 1, true);
i want to animate from the center and it has a xml driven data file.
I am currently looking at a way of visualising data and a part of the algorithm needs something 99% the same as A* Path Finding but I cannot wrap my head round it fully. I know it will be a fairly simple modification. (specific cost instead of least cost)
Basically I need to plot a path (2D Grid, no Diagonals) from point A to point B in X number of steps.
E.g. If the start and end points were right next to each other and I needed the path to be 3 steps it would have a tiny loop. (moves: up, right, down). Is there a known name for this algorithm or is the use of this so rare it's uncommon? I am currently looking at this AS3 Librbay for modification as it is apparently very fast and seems clean and simple to me:[URL]..
I once needed to pan a sprite full of movieClips (picture 1) which were draggable with no bounds so you could drag them up and left (higher than sprites registration point).
You could also drag them down and right and expand a sprite that way (as well) but that didnt matter.What did matter was how much is 'up' and 'left' from the sprite registration point so i can include that in my formula for panning.
This was easy to find, i just sorted my array of movieClips, sorted on x and sorted on y after each drag, and thats how i got my up and left points.
Now I am trying to do that same thing, exept my movieclips inside a sprite have a custom rotation (picture 2), so i also have an up and left point, except this time up and left are caused by rotations of movieClips inside a sprite... (and these are dragable as well with no bounds)
To make this easy, lets say I have a movie clip with a diagonal line in it (top left to bottom right).
I want to start my y position at 0, and place it in a loop and increase y by 5 every time. So we start at the top left of the clip, and move to the bottom of the clip.
Now since we have our y value (0, 5, 10, etc.) would you get the x position of the line? such as (x, y):
5, 10
or
42, 15
How could I find the distance between a given point and a drawn line? I was thinking about using the point-slope formula to draw a perpendicular line between the point and the line and measuring it as the distance, but I'm not quite sure how to do this in as3.
View 0 RepliesGiven this grid (tinyurl.com/63dgoja --> This is a trapezium/trapezoid, not a square), how do you find the point clicked by the user? I.e. When the user clicks a point in the grid, it should return the coordinates like A1 or D5.
View 2 Repliesi'm triying to make a dinamic generated plane, that plane has a grid with lines in X and Y, by now i'm able to generate a grid clicking and dragging points to make 4 lines and i generated 2 lines between the midles of the opposites lines like this:
[Code]...
i want to find third Point of Triangle i Have two point p1,p2 with respect to it i want to find third point of triangle
Note one thing triangle is 45 - 90 - 45 degree so the point i want to find is at 90 degree,
so as per my requirment p1 = 45 degree p2 = -45 degree and p3 = 90 degree so i want to find p3
I have a number of boxes on screen - each box is a rectangular movieclip, and they fall to the bottom of the screen where they pile up to make a stack of boxes. I'm using box2d for the physics. Oh, and each box may be rotated. I need to find the highest point - ie the smallest y value, of the stack of boxes.
Obviously I can find the position of the highest box's registration point easily (which is the centre of each box) - but that may not be the highest point of the pile of boxes. The highest point may not even be the highest box - it could be a lower box that is rotated on end, for example.
I want to find out if the user is currently using more than one finger to draw on the screen.currently, the TouchEvent object doesn't have any property like touchCounts, which tells the number of touches on the screen. it just has a touchPointID, which helps to identify a particular touch.
do i need to handle this on my own ? for eg: in the TOUCH_BEGIN event handler i could see how many different unique touchPointID i have received and update the count myself.
I have two circles, an inner circle and an outter circle. I'm trying to find points that reside within the area between the edge of the inner circle and the edge of the outer circle.
View 1 RepliesI've got a grid of sprites.Now I would like to drag an image on a grid-element.Therefore I need to know which x/y of the grid-element is the closest point to the mouse-position.
View 2 Replies