Line is defined by two 3d points; (0,0,0) and (x,y,z). And there is also this 3d point. How can rotate this 3d point around the line?
Something like this (points indicate vectors in my expression, it's the same thing) :
I found some stuff on the internet but I couldn't really figure it out.
I am using AS2 with Flash 8 Professional So, my problem is that I currently have a man in the middle of the screen, who shoots a line towards the mouse when I click. However, when I use hitTest to see if the line collides with another object, Flash recognizes the line as a large box if it is diagonal, so the hitTest isn't very accurate. The line only satys there for one frame, so I can't have the usual moving-bullet-style. I am either looking for a way to create an imaginary line with AS from the starting point to the mouse and beyond, and tell whether or not this line intersects with an object... or some other way that I haven't thought of to fix my problem. Keep in mind that the line rotates from a center point towards anywhere around it for 360 degrees.
View 1 RepliesHow 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 RepliesLets say I have two objects, and I want to use action script to draw a line connecting them, which will update automatically as they are moved/ dragged.Can anyone show me how to do that, and also how to control line's parameters like colour, weight etc?
View 1 Replieshow 2 sript: to draw a line ( 4 example ) frm point A to point B and then code it such that the viewer can see the line being drawn ?
View 9 RepliesI am developing a white board application which allows the user to draw line with arrow head (some like Microsoft Word line with arrow feature). I am using graphics property along with lineTo() method to draw a line. Now i have to draw a angular arrow on the last point of line. I am drawing the arrow by connecting the points around last points. As 360 line can pass through this point and each line can have a different angle of arrow.
View 1 Repliesconcept I can't wrap my mind around.If you've been the the sitehe has a "picture map"I've seen this used at other sites too.But what the rotation. The pictures always rotate around the point you click on.I just don't get it. I understand the momentum and all for the swing though
View 1 Replieshow can I make the green movieclip rotate in the point that the claw has catch it. To give an impression of physics. Here´s the image, to give you an idea:
The point (x,y) that the claw catches the colored movieclips below is not unique it can be any number. As long as the claw catches the colored movieclip.
how to do an effect like the one seen on this page?: http:[url]....
View 1 RepliesI 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.
var point:Point=new Point(spr_box.x+spr_box.width/2, spr_box.y+spr_box.height/2);
rotateAroundCenter(spr_box,45);
function rotateAroundCenter (ob:*, angleDegrees) {
[Cde].....
I have a MovieClip, that is representing a character in my game. Id like to "create bullets" shooting out from the tip of my characters gun. Problem is that when my character turns around, also the point rotates around the MovieClips pivot.
Is it possible to anyhow easily track this point, so that I could dynamically create new objects at the same location.
I tried to add a new MC as a child to my character, with the initial position at the guntip. In some systems child-objects "follow" their parents around, but it didnt seem to work here.
Is there any other "native" way of doing this, or do I just have to have a Polar-coordinates representation of the point relative to character-MovieClips origin, and add the MC rotation to theta, so that I can calculate the X and Y coordinates?
I'm working on creating an animation in which there are insects randomly moving around - based on tutorials on this site. Does anybody know how to make the insect rotate so that it always points towards the direction of travel.here's what's on my movie clip:
Code:
onClipEvent (load) {
scale = (random(100)+50);
this._alpha = random(50)+20;
this._xscale = scale;
[code]....
I'm actually coding this in Java (with which I have just a few days experience), but as far as the logic goes, I thought this would still be an appropriate place. I'm making a Tetris-eque game and having trouble with rotation. Each shape (rectangle, L, "step", etc) consists of 4 or 5 smaller squares (image below), and I want to be able to rotate the pattern of squares 0, 90, 180 and 270 degrees around a designated point.
x = originX + cos(angle) * radius;
y = originY + sin(angle) * radius;
I thought I understood these, but apparently not, since I can't seem to get it working� For each shape, I would declare the x, y coordinates for each of its smaller squares, relative to one another. Then, I'd send these values to a function that should take the pattern and rotate it according to the specified angle. In Java (to the best of my knowledge), the upper-left is always the "registration point" for graphics. So, I set the relative coordinates for the squares of each shape such that the left side of the leftmost square is at x = 0 and the top side of the uppermost square is at y = 0. Here's an example, the shape of a plus sign (+).
Code:
//top-center
x = squareWidth;
y = 0;
[code]....
no rotation (just the shapes)and this is what happens when I implement the rotation adjustment.
I am trying to make a line point to wherever the cursor is when I stumbled upon the Math.atan2(); function. It appeared that i would put
line.rotation = Math.atan2(1,1);
to get 45 degrees or pi/4, but I was wrong. It barely moved the movieclip at all. So what I'm trying to do is to get this movie clip to rotate along with the mouse so the line is always pointing at the cursor. Also, how would you get movieclip to move along the line created by the line of these two points?
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 RepliesI 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 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;
}
I've been trying to figure this out for a while now and cannot get it to work. I have a movieclip that can be moved up, down, left and right with the arrow keys, and reflected/flipped using the arrow and control keys together. However, I want to be able to use the arrow keys and shift to rotate the movieclip about a point with x co-ordinate 230 and y co-ordinate 180, regardless as to whether or not the movie clip has been moved up, left, etc.I've tried several different codes based on examples I've found online, but none have worked. I cannot make sure the centre point of rotation never changes.
View 0 RepliesHow 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 want to be able to rotate the ship around the center point and be able to update the .x and .y at the same time.I've got this two versions of code.1
Code:
if (aKeyPress[38])
{
[code].....
I have problem in fixing a starting and ending point of a drawing line, looking for assistance
View 18 RepliesI have been looking at how to reflect a point in a line, and found this question which seems to do the trick, giving this formula to calculate the reflected point:
Given (x,y) and a line y = ax + c we want the point (x', y') reflected on the line.
Set d:= (x + (y - c)*a)/(1 + a^2)
Then x' = 2*d - x
and y' = 2*d*a - y + 2c
However there are two problems with this implementation for my needs:
My line is not described in the form y = ax + c (so I'd have to translate it, which is easy to do, but it means the process is slower). What if a is infinity ie. a vertical line?
Is there a simple way to calculate (x', y'), the reflection of point (x, y) in a line, where the line is described by the two points (x1, y1) and (x2, y2)?
Edit:
I've found a formula which does this, but it seems as though it does not work with lines that look like they have equation y = x.
Here it is in actionscript:
public static function reflect(p:Point, l:Line):Point
{
// (l.sx, l.sy) = start of line
[Code]....
Can anyone tell me if an instance of a line as origin point and end point properties that can be read or changed? I know that if you create a line with actionscript you have to set them. But can the X and Y coordinates of the points be accessed once the line exists and moved to a different location?
View 3 RepliesIs there a way to tween a line's length to a point using actionscript? I have a diagram of a product and when the user clicks a button I want lines to draw to points on the product.
View 2 Repliesis there a short hand way to reassign a point in 1 line?
something like:
Code:
var p:Point= new Point(0,4);
p= [5, 10]; // doesn't work
i know you can just say
p.x=10;p.y=40;
but when auto formatting it will drop it down to 2 lines
I am trying to make an animation where there are several locations(say A,B,C,D,......) made on a map. If a person clicks on one location A and then another location B, I wanted to draw a dotted line from point A (from destination of the plane) to point B (to destination of the plane) using AS3.
View 15 RepliesTo 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 RepliesI have a motion tween right now with a moving point that is following a copied and pasted motion path. Is there a quick way to have the point draw a line behind it as it moves along the motion path??? I can't seem to find a good way to do it in AS3.
View 1 Replies