Attached is a mockup of what I'm after. Notes:
1. Spline appears smooth
2. Spline does not necessarily go through the points
3. The start and end point of the spline is not important
I'm sure there are ways to calculate this, but without knowing the proper terminology searching isn't turning much up,
I 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.
Envrironment: Flash CS3, AS3 I have a horizontal image scrolling project that I am working on, and it works but is not super smooth, I would like it to be smoother when it scrolls, and realize that this is a function of pixels scrolled over time and the FPS of the document.
Right now I am moving the items 1 pixel at a time on a timer with delay of 8 to get it to scroll at the speed I want. I am moving it at 1 pixel in order to catch exactly when an object should wraparound to the beginning of the scroller to show up again. So I don't know that I can really change the number of pixels moved to more than 1 and still have the images spaced perfectly, which makes me think I need to increase or decrease the FPS and or the timer delay to make it scroll smoother. Right now it is at 30FPS and as mentioned the timer delay is 8. Small changes to the delay is not a problem.
This is one aspect of flash i don't fully understand. I would really like to know how to figure this out so I can apply it to future projects as well without doing trial and error to make it smooth. Can it be function, like a way to figure out I need to move a 120pixel picture 60 pixels in 2 seconds, what should my FPS be and the picture size and movement size and number of seconds can be variables?
find a points in a line Actually i want to make some footsteps in a sand. The footsteps are dhynamically placed on the stage. How to find the points in a dioganal. see the image
View 1 Repliesi'm trouble to find a points in a line Actually i want to make some footsteps in a sand. The footsteps are dhynamically placed on the stage. How to find the points in a dioganal.
View 1 RepliesI just jumped from cs3 to cs5 and i'm curious about some behaviors of motion editor. I made a motion tween with some keyframes on x and y. I open the motion editor and try to convert those keys on x and y channels to Smooth points. Motion editor shows now nice curves on x & y but nothing changes on stage. The motion of my movie clip is not changed in anyway. Its like those keys are still Corner points. No smooth motion. Of course I can change the motion path straight from the stage or create a custom ease to smooth motion.
View 1 RepliesI have a series of variables created that store the distances between two points. I need to find the shortest distance between the two points so I'm storing the results in an array, then sorting the array to show me the smallest number which is the shortest distance. But the problem I have is that I don't need the number I need the variable in the calculation that relates to that number. Make any sense? So if the equation (herexPos - column3Begin) produces the smallest number I need to be able to reference column3Begin after I've sorted the array.
[Code]...
So, right now when I want to find the distance between two points, I go: dist = Math.sqrt((this_x-that_x)*(this_x-that_x)+(this_y-that_y)*(this_y-that_y)) BLECH! I don't want to do that every time. So I want to make a nice little function that I can apply to an object. Problem is, I don't know how to do this. Is it possible to end up with something as easy as: Math.dist(thisclipname, thatclipname)? How do you guys set up functions that do bulky math and return nice clean numbers?
View 4 RepliesHere is the problem:
var p:int = 0;
var n:Number = 0;
n = 32.999999999999999;
p = Math.floor(n);
trace(p); // returns 33
n = 32.11111111111111;
p = Math.floor(n);
trace(p); // returns 32
I would expect both of these to return 32. I have searched, and it seems this is an unreported bug in AS3. Or ... am I doing something wrong?
Wat is the diffrence between these two?
View 2 RepliesI have a function that sometimes is non-differentiable at a point. When I now use a spline (Bezierspline in degrafa) for interpolation the interpolation at this point does not work as expected (at this point my function has a kink). Now when interpolating with a spline it draws some kind of loop around this point. I think this happens because the spline needs the derivatives of the functions which is not unique at this point.
View 2 RepliesMy Flash application receives B-spline data from an external application but the Flash drawing API only allows quadratic bezier curves using the Graphics#curveTo() method.Is it possible to convert a B-spline into a series of curveTo() calls?
View 1 RepliesI have five dots(MovieClips) in my stage. I want to draw a curve which should touch all the five dots. The x position of dots are incremented by 50 px and y position is random.I can do this using lineTo. But it has not got any curve effect.
Here is the code using lineTo
Code:
_root.createEmptyMovieClip("circle",1);
with (_root.circle) {
clear();
[code]...
I tried curveTo to achieve this. But it is not working.
I have a code in which I have to use Math.round if a certain value is for example 3.67 (67 is higher than 50) and Math.ceil if a value is for example 3.23 (23 is lower than 50). What can I do to make flash calculate if what after the dot �.� in 3.23 (for example) is higher than 50?
View 2 RepliesI have a movieclip that I want to be resized when a button is clicked. I want the animation to be smooth as if it had weight though. I read the tutorial on this but I need something slightly different, I would rather it where I can just refer to a function that is set in another movieclip. That way I could easily refer to it again and just set the height, width, and if possible, x, and y.
And my second question, is how to keep the border of my movieclip that is going to be resized the same thickness. I want the inside to be resized but the sides to stay the same width but move to stay on the edge.
I am trying to create a similar effect to what is used in CityVille for dropping coins and experience icons, they do a custom move animation and it first moves a little bit up and then down. It looks like it is following a spline or a sine function.
View 2 RepliesI want to insert a bezier spline into my Canvas by this code
<mx:Canvas
id="graphCanvas"
width="100%"
[code].....
I have been tasked with trying to create a drawing tool that draws dotted lines as you drag the mouse across the stage. I can easily capture the points on MouseEvent.MOUSE_MOVE and store them in a vector and then draw the points as dots:
The problem is that I need to calculate evenly distributed points on an ever growing Vector of points so I can only draw the line between say every 5th point (say using modulus). I have been battling away with Bezier curve equations both Quadratic and Cubic but still can't quite figure out how to convert my Vector of points into an evenly distributed Vector of Points without sucking the life from the CPU.
So here is a piece of code that I have seen used a lot but don't really quite understand:
myVar = Math.min(Math.max(myVar, this.min), this.max);
or some variation thereof. I understand that the function first finds the maximum value of two values then turns around and uses that to find the minimum between two values.why this is done? And how do you know when to use it?
So here is a piece of code that I have seen used a lot but don't really quite understand:[code]or some variation thereof. I understand that the function first finds the maximum value of two values then turns around and uses that to find the minimum between two values.And how do you know when to use it?
View 3 RepliesI am trying to create a mindmap where the user can drag points about the screen. I have gotten as far as drawing the line via actionscript, and drag+drop the points (defined as movie clips on stage). This is the existing script - I don't know how to get the lines to follow the points. Something to do with ENTER_FRAME or updateAfterEvent?
var line:MovieClip = new MovieClip();
line.graphics.lineStyle(1,1);
line.graphics.moveTo(ptOne.x,ptOne.y);
[code]....
I have created a flash 3d racing game which relies heavily on AS3's Math functions (sin, cos, tan, asin, acos, atan). It also makes heavy use of Matrix3D and Vector3D functions. The game works great on a PC, but the cars flip around and display innacurate positions on Mac computers. I know this is an issue due to the note on the Math docs page: [URL]
which states: "Note: The Math functions acos, asin, atan, atan2, cos, exp, log, pow, sin, and sqrt may result in slightly different values depending on the algorithms used by the CPU or operating system. Flash runtimes call on the CPU (or operating system if the CPU doesn't support floating point calculations) when performing the calculations for the listed functions, and results have shown slight variations depending upon the CPU or operating system in use."
how do I get this game to work on a Mac? I've tried using lookup tables and inline FastMath style approximations. But lookup tables still create the same problem, and the inline approximations I have found are not accurate enough for my game. I've also tried rounding values with floating point errors, but that has not seemed to help (in my implementation) either. I think the specific problem is with the use of Math.atan. I have not found an accurate approximation for this.. but I maybe that is not even necessary.
How do I get a random number between 0.8 and 1.2 using Math.random(); ? It would be nice if you explain.
View 1 RepliesWhat is math.round() do? In kirupa's Random numbers tutorial, he explained the use of math.floor(), but said round() was for another time. Yet I see that, and not .floor() in use in the random movement tutorial.
View 1 RepliesAre there any math libraries for as3?
I need primarily statistics and regression formulas.
[Code]....
why is it undefined?
here's where all you math genius' get to help me out. I know that this principal is not difficult and was taught sometime during my highschool years.I need a math formula which reduces the ratio of any x:y to the smallest quanity possible. Basicaly so that the smaller of the two numbers is 1 and the other number is whatever it would be, compared to 1... but, I need it to work for both posative and negative numbers.(I'm the ultimate Math newb.. bear with me)
so. I have x=20, y=20 is 1:1
-20, y=-10 is -2:-1
x=10, y=-5 is 2:-1
ect.
so what is the formula for that?
this math isn't working well. I'm using it for a rotated drag and drop (of a tone arm on a vinyl, a kind of abstract turntable simulation). Right now it just moves a bit in the middle of the vinyl (values between 21 and 36, is this degree or what unit is this?), but it should move between the two edges. The problem is that I don't know enough about trigonometry functions. Therefore I can't optimize the math for envisaged behaviour. Does anybody have an idea/tip how I can get a bit more control on the math and its effect? (maybe with more trace functions)
[Code]...
Set variable as numbers
var monthly_num:Number = 0;
var ttl_num:Number = 0;
var ttl_rev_num:Number = 0;
// user-entered numbers from an Input textfields
monthly_num = monthly_txt.text;
ttl_num = ttl_txt.text;
// Multiply two user-entered number together to get new result
ttl_rev_num = ttl_num*monthly_num;
Attempts to assign numbers typed into textfields to numeric variables causes errors.
1067: Implicit coercion of a value of type String to an unrelated type Number.
I'm not that good with Math and i have a formula for a that it's universal from what i understood but i dont know how to transform it to work with Flash's Math API.
View 2 Replies