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.
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...
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 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'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]...
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]...
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.
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 want to create circle, and put 8 points on it. So, user can drag each point in order to change it's shape.
Is there any way to do this in flash?
I have some following code:
Ref. - How to draw a continuous curved line from 3 given points at a time
package{import flash.display.Sprite;
import flash.events.MouseEvent;
import flash.geom.Point;
[Code].....
So, can anyone convert these three point curve line to 8 points circle?
How can I move a point (or circle) slowly and the point let behind a line.When the point turn back the line will be erase.
View 8 RepliesI'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.
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 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 haven't worked very much with bitmap manipulation and I need to create an app that can find a bitmap (or a pattern of pixels really) in another bitmap.Are there other methods of doing it besides iterating through the pixels and using getPixel()?I'm of course looking for the most effective solution.
View 14 RepliesI have been working on this and thinking about it for days but I just can't seem to get it right. I want to have a circle that I can "pick up" with the mouse and then rotate (with the rotation point in the center). Currently I have done this with the following code:
PHP Code:
var radians = Math.atan2(mouseY-circle.y, mouseX-circle.x);
var degrees = Math.round((radians*180/Math.PI));
circle.rotation = degrees + 90;
I have added a mouse listener for movement to the circle mc and then checked if a button was down. On button down this code would be executed on enter frame. This code works but the main problem is that I want to be able to "pick the circle up" at any angle and rotate it. If I pick it up with this code the circle automatically rotates to 90 degrees.
How do I draw a ring or a center less circle in as?
View 2 RepliesI can do it on pen and paper using a compass, but can't do it in Actionscript 3.As the title says, essentially I need to find the centre of a circle using multiple points from the radius.
View 1 RepliesI have a circle with 8 dots around the edge of it. Based on the center of the circle and the mouse's location, I want the dot that the mouse is closest to, to get bigger. I've got this so far ActionScript Code: angle = Math.atan2(rt.mouseY - y, rt.mouseX - x); But I'm getting some weird quadrant values returned that are between -3 and 3. Is there a way to know which degree out of a 360 circle my mouse is at in regards to the center of the circle?
View 4 RepliesI want to draw a simple circle behind my class both center aligned, but I'm getting problems with the coordenates of my class/movieclip.Here is my class.
public class SM extends MovieClip {
public var auxx:Number;
public var auxy:Number;[code].....
I think that my class/movieclip isn't at (100,50) because when I manually substitute 'auxx' and 'auxy' in drawCircle for 100 and 50, still not ok.
I have a circle (bounding circle) offset from the centre point of my entity and I'm looking on how to move that circle around the entity as it rotates so that it's always in the same spot of the character.For example,say I have a bounding circle for the front of a car, when the car turns, that bounding circle needs to turn to So I have two points: position which is the position of the entity's centre point and offset which is the offset of the circle from that position. This assumes an angle of 0.
So if my car is facing 0 degrees: position (150, 150) and offset (50, 0) then the bounding circle would be at 200, 150.Now if I rotated the car 90 degrees, the bounding circle should be at position 150, 200.This is what I have now:
var differenceX : Number = _centre.x - _offset.x;
var differenceY : Number = _centre.y - _offset.y;
var rotatedX : Number = differenceX * Math.cos(_angle);[code]........But it's giving me these long ovals and now a perfect circle.
how can me move point arrount circle
just i want the point that you press on it and move it arrount the circle
I want to add point to curve when i click on the curve ,make sure the Original point not change ,eg. a Original point is a control point after add it is Still a control point ，so，may be it is need add two point at the same time
View 3 RepliesI'm trying to create sort of an eraser to remove sections of a bitmap on stage.
I have achieved this by creating a MovieClip in flash that is a circle and exporting it as a Class called Hole.
Now I use this MovieClip to erase a circle section of the image using the following.
var mat = new Matrix();
var ct = new ColorTransform();
var hole = new Hole();
mat.translate(x,y);
image.draw(hole, mat, ct, "erase");
Now what im trying to do is scale the size of the circle depending on a certain variable but no matter what I try the scale doesn't seem to change and. The size seems to stay the same as I drew it in Flash. I tried adding the following line
hole.width = hole.height = size;
I even created a class file called Hole and the size as a parameter
var hole = new Hole(200);
This didn't work either it still appeared to have the same size. I have even tried altering the scaleX and Y values with no success.
-Take a circle and place it in the center of a square scene.
-Make a rectangle and snap its left edge to the circle's center.
-Make another rectangle and snap its left edge to the right edge of the first rectangle.
How would you make it so movement doesn't happen at the registration point but on the whole arm. Say i ran a rotation script on the upper arm with +=1 and the lower arm with +=2. How would you place the parts, what format would they be converted to and what would the script format be. Multiple methods would be welcome of course!
I am trying to get a circle to move across from one horizontal point to another. I want this to circle to repeat itself after a certain amount of time but for the previous circle to carry on moving. I also want the circle to appear at different vertical points.
[Code]..
What I'm trying to do is make a dial-type of interface, where you click on a point on the edge of a circle and that point will rotate to another point at the top of the circle. What I can't figure out is how the make "Point B" rotate to "Point A", where "Point A" is always fixed at the top of the circle and "Point B" (and Point C and Point D, etc...) are located along different points on the edge of the circle. I'm using the tween function to rotate, so what I need to figure out is how to get the difference in the rotation between the two points.
View 7 RepliesOkay without putting a million boxes around the circle, which i found laggs out my game alot. How can i use some sort of code to find all the coordinates inside a circle.
View 2 RepliesIt's the beginning of a Monkey Island / Grisworld The Goblin kind of ultra short and simple game. Actually this is the only think I have to figure out.
Actually it already works if you click the x where it's positioned on the screenshot, but it doesn't work other places. And yes I've tried everything, and I'm just nok smart enough to figure this out.
More precisely it's the alternative path, after the arrow collides with the circle, that's causing me problems - since it's going to find it's way to the point clicked on stage.
How to make a point rotate about the circumference of a circle upon dragging. How do I go about doing it? Is there something to do with the
startDrag(...); ?
From what I have right now, I can move the point but not on the circumference of the circle.
I posted a while back looking for a function to make one movieClip circle around a fixed point. The solution I was given (which has worked perfectly up until now) is:[code]This function is called repeatedly by a Timer (loopTimer) with delay 10.The problem I have hit now though, is that if I want to modify or reverse the speed of rotation at any point it causes a jump in position (because I am setting the x and y values directly, rather than incrementing them e.g. "x = ..." rather than "x += ..."). Can anyone see a way to modify this function so that I can just increment the x/y positions?
View 5 RepliesI have a BitmapData with 2 red circles. I want to find the rectangle area or each circle. If i use [B]getColorBoundsRect[/B] I get the smallest area enclosed by the 2 circles. How can i go about this and get individual area of the circles?
View 1 Replies