Forums » Help » Friction in 1 direction

Hi,

Does anyone have an idea of how I would handle friction in 1 direction only (y-axis). I've got a top down "driving" game (it's not a car but requires up,down,left,right movement). If the player is moving up or down, I want them to accelerate and slowly come to a halt if they remove their hand from the direction keys. However I want the player to be able to move left and right, but instantly stop on the x-axis. The below sort of works, though the player won't move left and only seems to move right when going up or down:
//props:
maxVel:{x:200,y:200},
accelGround:50,
brakeSpeed:20,
friction:{x:10000, y:50},

// code in update() to handle movement
if(ig.input.state('left')){
this.accel.x = -this.accelGround;
}else{
this.accel.x = 0;
}

if(ig.input.state('right')){
this.accel.x = this.accelGround;

}else{
this.accel.x = 0;
}

if(ig.input.state('up')){
this.accel.y = -this.accelGround;


}else if(ig.input.state('down')){
this.accel.y = this.accelGround;
}else{
this.accel.x = 0;
this.accel.y = 0;
this.currentAnim = this.anims.idle;
}


I understand why the if-else above isn't really working, as the else conditions further down are firing and setting the accel to 0. But when I try it as follows, the friction on x doesn't seem to apply:

if(ig.input.state('left')){
this.accel.x = -this.accelGround;
}else if(ig.input.state('right')){
this.accel.x = this.accelGround;
}else if(ig.input.state('up')){
this.accel.y = -this.accelGround;


}else if(ig.input.state('down')){
this.accel.y = this.accelGround;
}else{
this.accel.x = 0;
this.accel.y = 0;
this.currentAnim = this.anims.idle;
}

It's late here as I type this, but a thought just occured to me. Am I better of setting this.vel.x = 0; Rather than the accel for left and right?

Thanks

That should work if you were to assign vel.x = 0 in your else statement for the left/right keys. Though, you would want to do this in a combined check to ensure that neither the left or right key is currently pressed.

If you do them separately, then any accumulated velocity would be lost each frame that you are not holding down both keys.