Physic Spaceship with Speedlimit

I want to make a Spaceship with Physic and give it a speedlimit:

<img src="https://dl.dropbox.com/u/34146606/Question.PNG" border="0">

Accelerate:

If Velocity > Max_Speed Then

Get Angle of this Motion:

Current_X_Velocity + Sin ( ShipAngle ) * Acceleration * dt   

Current_Y_Velocity - Cos ( ShipAngle ) * Acceleration * dt

Use the Angle:

Set X_Velocity: Sin (MotionAngle) * Old_Velocity

Set Y_Velocity:-Cos (MotionAngle) * Old_Velocity

Endif

Here is the capx:

CAPX

(at update_Spaceship/Apply_Input marked with comments)

(Use Arrow Keys and Ctrl)

Hope you can help me with sin/cos and the math ;)

Thank you

And this is my attempt:

<font size="6">Spaceship (Physic) Set Velosity</font>

<font color=magenta>X Component:</font>

<font color=blue>sin(angle(0,0,</font><font color=green>Spaceship.Physics.VelocityX</font>+<font color=red>sin(Spaceship.Angle)*Spaceship.Acceleration*dt</font>,

<font color=green>Spaceship.Physics.VelocityY</font><font color=red>-cos(Spaceship.Angle)*Spaceship.Acceleration*dt</font><font color=blue>))</font><font color=green>*

distance(0,0,Spaceship.Physics.VelocityX,Spaceship.Physics.VelocityY)</font>

<font color=magenta>Y Component:</font>

<font color=blue> -cos(angle(0,0,</font><font color=green>Spaceship.Physics.VelocityX</font>+<font color=red>sin(Spaceship.Angle)*Spaceship.Acceleration*dt</font>,

<font color=green>Spaceship.Physics.VelocityY</font><font color=red>-cos(Spaceship.Angle)*Spaceship.Acceleration*dt</font><font color=blue>))</font><font color=green>*

distance(0,0,Spaceship.Physics.VelocityX,Spaceship.Physics.VelocityY)</font>

Can anyone help me with the math?

bump

Why not just use the 8Way direction behavior? It has Max Speed, Acceleration, Decel? Seems like it does everything you want. Without any super fun geometry that I used to use in things like XNA.

No I want the Physic for bounce off and stuff. It's really just a math problem I can't put my finger on.

Still not understanding why you would do this manually. 8Way direction and physics behavior would cover this right? You could set the mass/density of your ship in relation to the speed as well.

firebelly I could be wrong , but using two behaviors in one shot would overlap the physics and cause some unusual problems ... The easy way isn't the always the best one !

Your Script Is pretty much too complicated ... I'm sorry ! I'm only Second Grade in High School ... Didn't study cos , sin and that stuff :p !

The Only thing that I can tell you is that you made your life complicated ...

Whiteclaw is right it messes everything up. And its really just the math, the script works fine (when you toggle the maximum capping of )

Can anyone take a look at the math?

Before getting grey hair with the math, have you tried the custom movement behaviour? I used it together with physics and it should work.

In my spaceship game I used Set Speed to Sprite[CustomMovement].Speed * 0.999

• so it would always slow down a little. This was in construct classic, but I believe it's the same principle.

The main idea is that the speed factor in custom movement behaviour have already made the math you're trying to do.

Can't you just set the velocity to the max_speed and let the physics behavior do the hard work for you ?

Segoi: I don't see how custom behavior should work this out without using the same math problem

Magistross: I could do that but I find it dissatisfying. When the ship gets a hit, say from an explosion and is tossed around, it shouldn't slow down instantly (very slow ships). I want to mix Arcade action feeling with a physical responsive world, in a way that you are still in control of the ship most of the time <img src="smileys/smiley2.gif" border="0" align="middle" />

I think I messed up the angle_of_motion, but I don't know how. <img src="smileys/smiley5.gif" border="0" align="middle" />

For the "tossing around", have you tried using directional impulse ? The ship would still have a limited velocity though...

The tossing works already in the game. Making the limit work well really is the problem.