I have an equation for a parabolic curve intersecting a specified point, in my case where the user clicked on a graph.
// this would typically be mouse coords on the graph
var _target:Point = new Point(100, 50);
public static function plot(x:Number, target:Point):Number{
return (x * x) / target.x * (target.y / target.x);
[code]......
I want to curve a dynamic text from a straight line to circular curve (using a slider). I have placed the characters of the string in each textfield created at runtime.
View 3 RepliesFinding the intersection point of 2 line segments is easy enough.
But now I need to test wether a line with thickness intersects another (non-thick) line.
My idea is to actually perform 2 tests, one at the top and bottom of the thickness of the line. Does that make sense? Is there a better way to do it? I dont need the intersection point, just a boolean yes or no.
I'm trying to improve upon the hitTest() function.I have a game in development that involves square robots, rectangular wall shapes, and line segment shots rotating and moving around. Without the rotation, hitTest works fine, but with rotation, problems arise.Walls at rotation 0,and square robots work fine. There is a small amount of funkyness with a rotated robot by a wall corner, but it's not very noticable.The big issue is collision of two rotated square robots.
I can create a function to get the line segments that make up each robot, and the check to see if any intersect. This will mean finding the location of eight points (using height and width and some trig to deal with rotation), finding the slope of eight lines, and then testing lines for intersection up to 16 times. This would be needed to find the intersection of each pair of robots. Those are worst case numbers, some colisions can be detected or ruled out before getting that far in the algorithm, but this check would need to be run every frame against all robots and walls and shots (shots could be a single line segment, though)Right now I'm talking about 8 robots max, maybe 6-20 walls, maybe 5-80 shots on screen @ 30 frames a second.
This is easy enough to create, but before I spend a day coding it all, I'm wondering if the computation requirements are going to make it prohibitive.(If so, I'll probably have to switch to circular robots).I feel like there should be a simple formula to find if two rectangles on a cartesian plane intersect, but I can't find one.
There is some information but I couldn't figure it out:How can I detect if a line intersects with a triangle ? And how can I detect the point of intersection in AS3 ?
View 1 RepliesI'm new to Flex, I've tried to do this using a CartesianDataCanvas inside backgroundElements in mxml, then using ActionScript to draw lines on the data canvas using moveTo(x1,y1) and lineTo(x2,y2), which draws a line between (x1,y1) and (x2,y2).
The problem with the above method is the tick mark length is a function of the chart area (which depends on the browser window size).
What I need is a method that:
(1) starts at a data coordinate (e.g. moveTo(x1,y1) works fine for this)
(2) draws a line to a screen coordinate (e.g. lineTo(x_screen, y_screen) where x_screen and y_screen are screen coordinates).
Is there anything that can accomplish this in Flex/AS3?
Alternatively, could I use screen coordinates for both steps above? If so, how to convert between screen and data coordinates? For example, is the upper right corner of the screen always a fixed data coordinate that I could reference is creating such a conversion?
Alternatively, could I save a five-pixel line in Illustrator and simply paste that image in the chart somehow? If so, how to paste it exactly at a data coordinate?
How do draw a vertical line and make it bend into a curve as the mouse hits it.
or better yet,
a box that traps the mouse in it and stretches out when mouse hits the side.
Using AS2, how can I have a character movie clip walk along a line/curve without falling through it? By this I mean the character could say, walk over a hill whilst jumping (falling back down due to gravity physics) but would not fall through the curve that represents the hill.An example of this would be BMX star or BMX backflips and any game that is a side-on view of a character walking.
View 1 RepliesI was hoping someone could help me working out some advanced data reformatting. What I'm hoping for is a function where I can input a value along with an array of key positions like so:
function remap(percentage:Number, keypoints:Array) { ...
The array would start with the minimum and end with the maximum point, with nested key points along the way. For example, I would input something like remap(0.25, [0:0,80:50,100:100] ) and the function would 'imagine' a spline curve graph from (0,0)-(100,100) with a key point of (80,50), then return the y value that is 25% along that graph.
I have a curveTo an anchor point and a control point.Then I have a function that will return the x and y of a point along that curve if I give it a number as a percentage of the curve (0 to 1).It looks like this, and works perfectly..
Code:
function drawOnCurve( interval:Number, x0,y0,x1,y1,x2,y2)
{
interval = Math.max( Math.min( 1, interval ), 0 );[code]....
x0,y0 are the start point, x1,y1 the control point and x2,y2 the final anchor point.But... I want to give it a _y value instead of a percentage (interval) and it return where on the curve that would intersect.
You can assume that the first image below is the original Gaussian curve. The second image is the desired output. I have these equations:Equation of each red line segment (let's call this the piecewise function f(x))Equation of the Gaussian curve (g(x)) am trying to make an equation that can alter the Gaussian curve to match the curve in the second image. I have tried plotting (f(x) + g(x)) / 2 (last image) but it doesn't do the trick. I have also tried using the red line segment on far right as the independent axis for plotting the right part of the curve but that leads to a huge discontinuity.
View 2 Repliesas possible because I'm having a competition of some sort of..... In Flash Action Script Language Form the code of Vector Intersection will be in this way:
Code:
v3={vx:v2.p0.x-v1.p0.x, vy:v2.p0.y-v1.p0.y};
var t=perP(v3, v2)/perP(v1, v2);
[code]....
I need to calculate the intersection between two shapes in flash / action script. The problem is I can't access the shape's nodes and segments, and their coordinates, so there's no way I can calculate this. Do you know a way?
edit: further explanation: I imported irregular polygons from an EPS file to a movieclip with shapes in it.The mathematical solution to the problem is trivial, but to do that, I need to access by AS code to the coordinates of the nodes that make up the polygons, which I tried with no success. That is what I'm trying to accomplish.
edit2: dismiss this question. It's not possible. The workaround I'm applying is to save the polygons in SVG and parse them to get a list of nodes. then will feed that list to flash to calculate the intersection and areas on runtime.
I am currently working my way through a book on Game Programming in Actionscript 3, and have gotten to a formula required for collision detection on finding the intersection point of two vectors. Im not sure if the author uses vectors in the strictest definition, but the convention he uses is e.g for a vector V1 :
V1.a is the start point of the vector V1.b is the end point of the vector V1.ln is the vector perpendicular to V1 (its 'left normal') V1.vx is the difference between the x coordinate of V1.b and V1.a V1.vy similar to vx V1.dx is the same as vx , but for V1 scaled down to a unit vector (the direction vector) Now,in the example we have V1 which is the motion vector of the ship, and V2, which is the target vector (i.e the line the ship is going to collide with at some point)
In order to calculate at what point on V2 the ship will collide travelling along motion vector V1, the book gives the following code using the "perpendicular dot product" (Which i have not come across before) and creating a third vector V3 between the start point of V1 and the start point of V2 (V1.a and V2.a):
[Code]...
I am plotting an AreaSeries and a LineSeries on a AreaChart using Flex 3 in built chart components. I want to code a custom item renderer for LineSeries to be shown at the intersection points where LineSeries crosses AreaSeries.
View 1 RepliesI am creating a website in Flash CS4 Actionscript 3.0? I want to have buttons that will only exist within a "Demo_Page" section of the timeline. I have the code below which works fine for buttons that exist through out the intire timeline.
[Code]...
I need to limit an angle so it fits into a segment. I have drawn and links to a diagram below to better describe what I am after. I am trying to calculate this for a computer program, where I have an angle (slope), and a point (the mouse pointer). The distance does not matter to me, just the angles. If the point is within b1 (green area) then that's fine. But if the point is within b2 or b3 (red or orange) areas, then the angle should snap back to the limit of the green area (along the line s).
The main problem I am having in figuring this out, is snapping the angle to the correct side e.g. If the point is in the red area, then the angle should snap to the angle s on the red side and vice versa. I am also having trouble because s could be any angle, so I am being tripped up because I can't just do something like this:
[Code]...
Currently I have the code:piechart.l1.gotoAndStop("percent_20")But I really need it to play from label "percent_1" to "percent_20" and then stop. Is there an easy way to do that?
View 2 RepliesI have a long video of 50 minutes duration..
I want only show a segment for that video, for example I want to start from minute 15 until minute 16, Only shows a minute for that video, but, I want to see that video as a complete short video of 1 minute duration.
I have a long video of 50 minutes duration..I want only show a segment for that video, for example I want to start from minute 15 until minute 16, Only shows a minute for that video, but, I want to see that video as a complete short video of 1 minute duration.How can I make this goal?
View 1 RepliesI have 3 text fields that display weather conditions from the Weather.com XML web service. The 3 text fields need to be visible only during a certain segment of the Flash Video that is set as the application's background. Do I use AS3 to specify visiblity? If so, how do I reference a certain range of frames in which the fields should be visible?
View 1 RepliesIn raw format stream data are divided into many files named "segments". How can I configure the size of this files? I want to make them twice smaller.
View 1 RepliesI know the length of the triangle segments and the xy coordinates of two points. How do I figure out the xy of the 3rd point?
View 3 RepliesI have a flex pie chart:
[Code]...
Basically, what annoys me is that when I click a segment to activate the interpolated event, the datatips disappear for it's duration. Whilst this is only half a second, it still detracts from user experience. Is there anything I can do to avoid it??
[Code]....
i have an xml file and i want my code in flash to read it line by line but its only showing the first line out of 5 lines.Below is the code:
var NigeriaNumber:Number;
var stateName:String;
var year:String;
[code].....
We're using FMIS 4.5 exclusively for recording streams from webcams via RTMP. We don't have a lot of load currently, maybe a couple hundred videos being recorded every day. Every 1 or 2 days the FMS starts logging "The FLV segment cache is full" and refuses to record anymore until a restart. I've adjusted the cache setting to the max for Linux:I suspect that it's putting everything recorded into the cache, and refuses to record anymore when the cache is full. Why is it doing this? The files are written to disk, why won't the data be evicted from the cache? Am I misunderstanding what's happening?
View 4 RepliesI'm draving a loooong curve and i want to see what is the length of that, how to do that?
View 1 RepliesI am trying to bend 2 parallel lines into a circle, but with a motion tween, it curves under eachother... (see att)how would I make them curl to a circle
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[code].....
I am using the code attached below to make dynamic text curve.
My question is: How can I invert the curve or arc, while making sure that it still reads the same? up to down.
How can I animate a curve being drawn with as3 drawing api.I am not interested in masking it out or other tricks. I am interested in drawing it whith the api.This would be the equivalent, but only a straight line:
var steps:Number = 30;
var currentStep:Number = 0;
var startPoint:Point = new Point(100,100);
[code]....