Games how move object to another object position ?

[sager]

how move object to another object position ?
and control with speed and direction

 

[Erel]

I like to use the MotorJoint to move objects to a target position. Check this example: https://www.b4x.com/android/forum/threads/xui2d-mouse-following-a-path.98895/#content

 

[Gunther]

to another object position

and if they collide then the other object will be moved by an impuls. You may avoid that by setting the correct Collision Mask Bits:
Collision Mask Calculator
Collision Tutorial

 

[sager]

I like to use the MotorJoint to move objects to a target position. Check this example: https://www.b4x.com/android/forum/threads/xui2d-mouse-following-a-path.98895/#content

thank you , but can give me simple code to move object to another without path ?

 

[Gunther]

move object to another without path

thing.body.Position = X2.CreateVec2( x1, y1 )

this moves the "thing" at position x1,y1 (in the next GameLoop = at once)

 

[sager]

thing.body.Position = X2.CreateVec2( x1, y1 )

Maybe I did not explain what I want correctly,
I want the enemy move to player Position
i try : template.BodyDef.LinearVelocity
But it gave me different results

 

[Gunther]

Well, that is for sure different!

1) calculate the direction vector by subtracting the enemy Position from the Player position
2) normalize the direction vector
3) now your approach is taken: set the LinearVelocity with this new vector from 2)
4) may be it shall go faster or slower then in step 3) you should multiply the new vector 2) with a scalar

You may add a more sofisticated solution by using "easing" (check google on 'easing')

 

[sager]

Well, that is for sure different!

1) calculate the direction vector by subtracting the enemy Position from the Player position
2) normalize the direction vector
3) now your approach is taken: set the LinearVelocity with this new vector from 2)
4) may be it shall go faster or slower then in step 3) you should multiply the new vector 2) with a scalar

You may add a more sofisticated solution by using "easing" (check google on 'easing')

can you give me simple example , thanks

 

[Erel]

Example: https://www.b4x.com/android/forum/threads/xui2d-example-pack.96454/page-2#post-651573

 

[Gunther]

give me simple example

Erel modified his Mouse Example and this is the code extract that I explained in post #7:

Private Sub MoveEnemy
    Dim v As B2Vec2 = Mouse.Body.Position.CreateCopy
    v.SubtractFromThis(Enemy.Body.Position)
    If v.Length > 0.7 Then ' <--- check, if they are too close to each other
        v.NormalizeThis
        ' you could multiply that v by a scalar to change the speed like:
        ' v.MultiplyThis(1.5) ' >1 = faster, <1 = slower 
        Enemy.Body.LinearVelocity = v
        Enemy.Body.SetTransform(Enemy.Body.Position, ATan2(v.Y, v.X) + cPI / 2) ' <--- turning the enemy in player direction
    Else
        Enemy.Body.LinearVelocity = X2.CreateVec2(0, 0) ' <--- yes, too close, therefore stop enemy
        Enemy.Body.AngularVelocity = 0 ' <--- stops the spinning
    End If
 
End Sub