sprite deceleration

[jerome]

Hi,

 

I want to have a sprite (laser) decelerate from its original position (cannon) to its destination (current pointer position on click).

I tried negative values with accelerateToPointer :

game.physics.accelerateToPointer(laser, this.game.input.activePointer, -600, 100, 100);

but the behavior isn't the one I expected since the sprite goes immediatly backward.

 

So I tried to play with body.acceleration instead :

laser.body.velocity.x = 500;laser.body.velocity.y = 500;laser.body.acceleration.x = -500;laser.body.acceleration.y = -500;

The behavior is far more better (the sprite slows down til a certain point, but then goes backward), but I couldn't find how to set the minVelocity for the sprite to decelerate.

Whether I use body.maxVelocity or nothing, it finally goes backward (negative speed, I guess).

 

Is there a way to set this minVelocity for negative accelerations or need I just to test by myself the velocity in the update loop ?

 

[rich]

Have you tried applying a drag to the Sprite?

[jerome]

laser.body.velocity.x = 800;laser.body.velocity.y = 800;laser.body.drag.x = 800;laser.body.drag.y = 800;

no effect at all    (no slow down)

Am I doing it wrong ?

Maybe is it worth I compute decreasing velocity in my code ...

[rich]

Currently drag is only applied if there's no acceleration set, also the drag value you've got there is really high. Make sure you've no acceleration set and set drag to something smaller (try 100 to start with) and see if that effects velocity the way you'd expect.

[jerome]

function fireLaser() {  laser = lasers.getFirstExists(false);  if (laser) {    laser.reset(80,20, 1);    laser.outOfBoundsKill = true;    //laser.rotation = game.physics.accelerateToPointer(laser);    laser.body.velocity.x = 800;    laser.body.velocity.y = 800;    laser.body.drag.x = 50;    laser.body.drag.y = 50;    }  }}

Still no deceleration effect, although there's no acceleration set

 

prototype here : http://jerome.bousquie.fr/phaser/game1/

 

but please don't mind, I'll compute the decreasing velocity

[jerome]

oops : mouse to aim, click to fire, wrong laser direction and velocity for now ... just prototyping