ActionScript 2.0 :: Mathematics - Determine The Formula Of The Curve?
Jun 30, 2004
I can't pinpoint or make up a set of calculus to determine the right formula which describes a curve that goes through 3 specific points...I'll try to say it with a more hand-on approach. I have a spaceship which can move vertically,located to the left.The enemies, obviously, arrive from the right. Now, when i click anywhere on the scene,I want a missile/plasma orb/projectile to be shot from the spaceship, but doing more than going in a straight line: imagine 3 points, one at the spaceship, one in front (therefore to the right) of the spaceship (5/10 units in front) and the third at the click location. How do I determine the formula of the curve that goes along these three points?
i have a game inwhich a bait is thrown determined by a variable of a power meter, when the meter is full it returns a variable of 1 when half 0.5 and when low near 0, how can i use this to determine how far my "bait will be thrown" onto the screen? i have tried how ever the X value would not be consistent with my fishing rod placement, and when the point is decided i will have to move my bait to that point and stop.
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.
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.
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..
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.
I am a newbie in flash actionscript. My assignment needed me to create a simple flash mathematics game for mobile. Some Mathematics question will appear in order and 4 options will be provided for each question. On the top, there will be an object. The object will move 1 step forward if the answer for the question is correct. But if the answer is wrong, there will be a popup message "try again". when the object move to the ending point. You win the game. And the timer will stop timing and record the time in the memory. And the time will be display in a high score tab.
I've built a code to cyclically move a scene on the bottom of my stage; I've done this to make a slowing-and-stop-easing effect at anytime the command will arrive. The entire scene mc is _x long something like 6000 px. The whole code goes in this way:
1) importing on the stage (with attachMovie) a mc with this code inside:
onClipEvent(enterFrame) { _parent._parent.fondo_mc._x -= countermovement; if (_parent._parent.fondo_mc._x <= -5800) {[code].....
The code goes right, but I need to improve it.Now there is just a variable, I tought to use two vars to implement the whole code in a setInterval, but maybe it's unuseful, and actually I can't use it in the right way.
Second issue: actually when slowAndStop function is called the scene slow too fast, if I take it to 15 it slow better but the scene is running too fast...
The best would be that the scene slow down and stop following: A) a temporal variable (and I can try to implement it with setInterval, that for istance is a cycle)
B) an indipendent moving variable, so that on one side I set the speed, on the other side I set the slow-and-stop in a matter of time with countermovement.I also tried to use a second variable:
var counter:Number = 15; // set the _x increment var countermovement:Number = counter/2;
I'm having a real problem trying to work this out...
A: I start with a movieclip on stage. it's 100x100.
B: I set xscale and yscale to 150.
C: I use "attachMovie" to add a little man into the square.The problem is, the man has an xscale of 100, but he is also scaled with the movieclip square container. So he appears too big.
D: What i would like to know, is what formula you would use to reduce his scale so he is the correct height, if the container movieclip had an xscale of 100?
I need to calculate the value of a formula which is passed dynamically by using text box.This formula contains a set of variables which are already declared and assigned a value(hard coded). I will provide a submit button , on clicking this button I must be able to evaluate the formula that I have passed dynamically using the text box.
I've been trying to look this up but not had any luck so far. I'm trying to make a simple pseudo-3D app, but I'm stuck on how to pull off the movement. If I have an object with x,y,z coordinates, and its movement speed, pitch, and yaw, what formula would I use for movement? So for example, if the object is at 0,0,0, moves 6 units per frame, and has pitch 30 degrees and yaw 15 degrees, what will be its coordinates next frame?
I have a little math problem with a game I'm making, and I can't for the life of me figure out the formula needed to accomplish something..Say, there's a sniping game, and a BIG image that must scroll from left to right according to the mouse movement.
Something like this:[URL]... In that example, the scene is 550 pixels wide, and the image is 1100, exactly two times the scene, so the formula is kinda easy..
[Code]...
the center of the image would be at x 1500, way over to the right of the scene, outside it, but it would fit inside the screen, like this (the blue square represents the real size of the scene):[URL]..Then when the mouse is at the far right side, that is 550 x, the image center should be at -950 x, like this:[URL]...
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.
I've been searching for the formula used intrinsically in Flash but I couldn't find anything. Does anybody know how the result colors are obtained when the 'layer' blend mode is chosen for the upper object? I thinks it's done separately in each channel using the transparency values.There might be some bitwise operations going on there but I'm not sure.
i'm trying to dynamically layout a calendar using actionscript and i'm no good at determining algorithms to quickly and efficiently lay things out.what i want to do is set it up per the image attached:
* where there are 7 columns and a varying number of rows.
* the top row has the 2 arrows and the month and year display.
* the second row has all the day headings, i.e. S, M, T, W, R, F, S
* and the rest of the rows will have the dates.
how do i come up with a nice clean formula to calculate the positions so all these elements align?
When I print out the loan_amount I get a 0.If I do: var loan_amount = (Math.pow(trm, (1 + apr)) -1); it will give me the result 1.0331079714165e55
As soon as I add the next part of the equation (apr / (Math.pow(trm, (1 + apr)) -1 )); it will give me the actual apr value as the result instead of the apr divided by the 1.0331079714165e55.Likewise, if I try to add a fixed value instead of the apr variable, it will return that fixed value instead of doing the math.
I´d like to know how would I make a formula for the calculation of speed.It´s not as simple as distance divided by time.I want something different.I have an helicopter.This helicopter is landed.He will take off with a small speed, but increasing speed.What I want is.This helicopter movement. In other words, increasing vertical speed, in a given time, say, 2.4 seconds, in a give distance, say, 100 pixels.After that he keeps vertical speed constantly. So I think the helicopter will start with its vertical speed slow, increasing, then, decreasing untill it reachs its constant vertical speed.
how to convert it to 0 and also if the number wsa 9, convert it to 1, and if it was 8 it gets converted to 2.. and so on.. where if it was 0 it would then be 10 Is there a formula? The 0 to 10, and 10 to 0 may not be possible but that's ok.
Currently, we have an activity in class wherein we're supposed to resize a Movieclip to a specified size restricted to any value between 50 and 250% that will be entered in an input text field. If the value entered goes beyond 250 or below 50%, it's also supposed to show a warning that the entered value isn't valid. Also, when a value is entered in the textfield, supposedly, it can be entered either by using the ENTER key or by clicking the resize button.
I've already managed to resize the movie clip according to the amount specified but I think there's something wrong with the "If" condition in my resizeShape function, because it still accepts values above 250 and below 50%. Also, I don't know how to make it so that both pressing the ENTER key and clicking the resize button enters the value without repeating the whole resizeShape function.Here's what I've done so far:
ActionScript Code: var input_txt:TextField=new TextField(); var warningBig:TextField=new TextField(); var warningSmall:TextField=new TextField();[code]...........
Im having a problem with this code to convert decimal to binary ive got the formula but it wont print to the screen_txt only on the console and also my calculator wont let me change any other number other than 3 so if i press 7 binary should be 111 but it stays 11...
I have an app that was actually written for me. It's a multiple choice quiz basically where a question comes up and there are 4 answers. HOWEVER the answer always seems to be 80% on the same answer ie: BUTTON ONE out of the four. BILLIANT random function I don't think.Would this be a better answer formula to use?
function randomBetween(a:Number, b:Number):Number { return (a + Math.floor(Math.random()*(b-a+1)));}
I admit it. I'm a mathematical imbecile. should I be attempting this at home? Probably not without serious injury. Anyway. Anyone that has a bit of experience in games and physics who can review this code and provide insight into why there is a built in "loss" in velocity in prototype would be hugely admired.
the concept: the actor falls from the sky, at some point intersects a boundary (trampoline.y) after which gravity (in this example a value of 1.6) stops operating and a restitution factor (in this case a value of -6) takes over.
right now I'm trying to create a zero-sum situation where you have the same velocity coming out of the trampoline "bounce" (hero.y >= trampoline.y) as you did going in. That's just not the case as the traces reveal.
[Code]...
For now I'm hoping to have a solution where the velocity on the tic after the character leaves contact with the trampoline is the same (but negative) of the velocity just prior to going in. Heck I've even tried storing and retrieving the entry position and velocity, but that just looks like a hiccup.
I've got an object (camera) I'm trying to pan. This code works perfectly for panning it on the Y axis, but it's the exact opposite for the natural panning motion of X. By simply subtracting the velocity (as opposed to adding), the camera.x creates a crazy "Ease In" effect that shoots the camera off at a crazy speed. I've tried reversing the order of everything, but without the result I'm seeking.
I'm having a problem with a function that I have in my Flash: in the output window, it's giving me the following errors:
[Code]....
Why is the output not displaying the telephoneNum.text, it seems as though it doesn't even see the information that a user types in that field. It is also displaying the message in the incorrect_txt field regardless of what I type in the field.
so i have some scrollbar(track and button) and some content.the formula i am using to calculate to calculate y of content is the following:
//contentStarting.y and scrollbarButtonStarting.y are positions of sprites at the moment they are created content.y = -((contentStarting.y -scrollbarButtonStarting.y) +scrollbarButton.y) * ((content.height- content.mask.height) / (scrollbarTrack.height - scrollbarButton.height));
the only problem i have is that i need to add extra space after content, so basically i want forumla to act as if content. height = content.height + extraSpace , but unfortunatelly setting the height scalesY, which is what i don't want.
i'm trying to dynamically layout a calendar using actionscript and i'm no good at determining algorithms to quickly and efficiently lay things out. i was hoping for a litwhat i want to do is set it up per the image attached:* where there are 7 columns and a varying number of rows.* the top row has the 2 arrows and the month and year display.* the second row has all the day headings, i.e. S, M, T, W, R, F, S* and the rest of the rows will have the dates.
First note: mathematically, I'm not that skilled at all. I played a game on iPhone a while back where you press a point, and an arrow fires from your castle which will always intersect the point you pressed. I wanted to make a similar game, thinking it would be an easy quick make; then I ran into the realization that the mathematics for this is actually beyond my skill level.
I'm assuming they're using a parabola formula or something which would determine the velocity and angle needed when the arrow is launched for the arrow to always intersect the clicked point. I only vaguely remember how parabolas work from school and have no chance of working out any formulas.
I'm trying to just make an image center horozontally in the page when I addChild it. I figure the formula I need is the width of the of the image deducted from the width of the page divided by two... but I don't know how to make that into a formula, as in I don't know how to represent the size of the newly added child in the formula. Code is below.
