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Type: Posts; User: Nialsh

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by Nialsh
Replies
4
Views
14,398

### This is a great way to teach physics. I...

This is a great way to teach physics. I definitely understand LRC circuits better for having played with this. I also have a lot of suggestions.

The dynamic text boxes on the bottom should be...

by Nialsh
Replies
1
Views
10,838

### var x = /* user input */ if (x < 10) { //...

var x = /* user input */
if (x < 10) {
// bottom unbounded range x < 10
} else if (x < 15) {
// 10 <= x < 15
} else if (x < 20) {
// 15 <= x < 20
} else {
// top unbounded range x...

by Nialsh
Replies
1
Views
11,243

### I'm not aware of a tutorial but generally...

I'm not aware of a tutorial but generally speaking, that system is called an inverted pendulum.

You can find a lot more about it here http://en.wikipedia.org/wiki/Inverted_pendulum
4. ## Thread: Tile-based collision detection

by Nialsh
Replies
3
Views
15,448

### If you're pretty certain that you won't change...

If you're pretty certain that you won't change your mind about representing the player's shape as a non-rotating rectangle, you can keep the math simple. Just check to see which dimension has the...
5. ## Thread: Tile-based collision detection

by Nialsh
Replies
3
Views
15,448

### You're checking the vertical cases before the...

You're checking the vertical cases before the horizontal cases, so they're winning every time.

Try making them weaker.

function CollisionObjectTile(object)
{
var BOUNCE = 0.5;
var...

by Nialsh
Replies
1
Views
433

### It depends how realistic you want to get. Like...

It depends how realistic you want to get. Like if you drive off a ramp, should the bike stay airborne for a couple of seconds? Should it behave like this game?...
7. ## Thread: How to detect the point of intersection of a Line and a Triangle (3D)

by Nialsh
Replies
2
Views
6,328

### That site looks like it gives a pretty thorough...

That site looks like it gives a pretty thorough explanation of what needs to be done.

I assume you're trying to implement a function like this

import flash.geom.Vector3D;

function...

by Nialsh
Replies
3
Views
6,740

### What you're talking about is "continuous" versus...

What you're talking about is "continuous" versus "discrete" physics simulation.

Until you start dealing with collisions, continuous simulation is actually quite easy. The arcs you see in Sling...

by Nialsh
Replies
1
Views
4,525

Check out the last section of this page on pool physics http://archive.ncsa.illinois.edu/Classes/MATH198/townsend/math.html

It even tells you how to calculate the spin, if you're into that sort of...
10. ## Thread: Scrolling Top Down with Hit Test (Brute Force)

by Nialsh
Replies
2
Views
1,096

### At the end of HitTestPoint.as, I uncommented ...

At the end of HitTestPoint.as, I uncommented

camera.x = player.x;
camera.y = player.y;
and that seemed to fix it...

I'm using CS5 if that means anything.
11. ## Thread: Finding the normal vector of rotated object

by Nialsh
Replies
5
Views
4,781

### Interesting question. I think I figured...

Interesting question. I think I figured something out.

Let's say the normal vector for a flat sprite is pointing out of the page (ie. <0,0,-1>). You can use your the transformation matrix from...
12. ## Thread: Finding the normal vector of rotated object

by Nialsh
Replies
5
Views
4,781

### Normally sprites are 2D so I'm not sure what you...

Normally sprites are 2D so I'm not sure what you would be doing with a 3D vector...

Can you give an example of what you're doing?
13. ## Thread: Simple problem, how to get angle between two points?

by Nialsh
Replies
5
Views
31,272

### Suthers, Welcome to flashkit, I see you've...

Suthers,

Welcome to flashkit, I see you've found all the old threads.

If you look at Adobe's documentation, the parameters for atan2 are actually (y,x)....
14. ## Thread: How to draw the normal to line

by Nialsh
Replies
8
Views
7,080

### If you points are A and B, your normals are:...

If you points are A and B, your normals are:
<By-Ay, Ax-Bx>
<Ay-By, Bx-Ax>
15. ## Thread: How to draw the normal to line

by Nialsh
Replies
8
Views
7,080

### How is your line defined? Is it a line segment...

How is your line defined? Is it a line segment formed by two points?
16. ## Thread: How to draw the normal to line

by Nialsh
Replies
8
Views
7,080

### A line has two normal vectors, pointing in...

A line has two normal vectors, pointing in opposite directions.

If you know the angle of the line (theta) in radians, the angles of the normal vectors are:
theta+PI/2
theta-PI/2

Or if you...
17. ## Thread: How to draw the normal to line

by Nialsh
Replies
8
Views
7,080

### Not sure what you mean. Why don't you draw a...

Not sure what you mean. Why don't you draw a picture and post it?
18. ## Thread: [game] "Whoosh!" Something to actually show for myself, heh

by Nialsh
Replies
15
Views
2,570

### Cool game. I agree the controls could use some...

Cool game. I agree the controls could use some help. But it came together nicely.

Here's how I would set power. http://megaswf.com/view/1f6a1593a9de3086ce223c46f400613b.html

And maybe make...

by Nialsh
Replies
5
Views
4,897

### Here you go. I fixed that other code but decided...

Here you go. I fixed that other code but decided it was the wrong approach, so here's another take.

function onRollOver():Void {
lightning._alpha = 100;
videostopped = true;
var xOffset...

by Nialsh
Replies
5
Views
4,897

### Yeah, you can get away with just one arrow. ...

Yeah, you can get away with just one arrow. Here's some code off the top of my head.

function onRollOver():Void {
lightning._alpha = 100;
videostopped = true;

var...
21. ## Thread: Need help finding coordinates of a triangle

by Nialsh
Replies
3
Views
5,050

### length of BC = L*tan(angle CAB) length of BD =...

length of BC = L*tan(angle CAB)
length of BD = L*tan(angle DAB)

Tangent is a good function to know. http://en.wikipedia.org/wiki/Trigonometric_functions#Tangent

In Flash it's Math.tan(). ...
22. ## Thread: Maximum screen size?

by Nialsh
Replies
3
Views
1,847

### Put that command in an onEnterFrame?

Put that command in an onEnterFrame?

by Nialsh
Replies
10
Views
1,029

### This should do it. var feet=(6*ammount)/100;...

This should do it.

var feet=(6*ammount)/100;
var inches=Math.floor(12*(feet-Math.floor(feet)));
feet=Math.floor(feet);
if(feet == 0)
else
...
24. ## Thread: [RESOLVED] two rectangle collision REACTION

by Nialsh
Replies
7
Views
5,842

### I've never seen a Flash program that allocated...

I've never seen a Flash program that allocated too much memory. Making things invisible can make improve speed because it reduces the rendering time. But I wouldn't worry about it - just write your...
25. ## Thread: [RESOLVED] two rectangle collision REACTION

by Nialsh
Replies
7
Views
5,842

### Yeah, I don't know why nobody answered you... ...

Yeah, I don't know why nobody answered you...

What you're talking about is called "rigid body dynamics". It's a branch of physics that describes the way rigid objects move (and collide) in space....
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