[Phaser Tanks] - How to move... Backwards ?

[Mikoziq]

Hello Everyone,

 

So... how should I refactor the code to gain my tank ability to move reverse ?

 

Should i use else if statement in those lines ?

if (cursors.left.isDown)    {        tank.angle -= 4;    }    else if (cursors.right.isDown)    {        tank.angle += 4;    }    if (cursors.up.isDown)    {        //  The speed we'll travel at        currentSpeed = 300;    }   if (cursors.down.isDown) ???    {         //something   }    else    {        if (currentSpeed > 0)        {            currentSpeed -= 4;        }    }

[Snade]

If you put in a number thats below zero it should move backwards if I am right.

if (cursors.up.isDown){	//  The speed we'll travel at        currentSpeed = 300;}if (cursors.down.isDown){ 	//  The speed we'll travel at        currentSpeed = -300;}

[Skeptron]

You should use else if statements for opposite directions : if(goUp)else if(goDown) // if(goRight) else if(goLeft).

 

Other than that you want to be able to go left AND up, or right AND down for example, so no else if between these directions.

[Janzen]

I'm having the same issue. I already tried what Snade and Skeptron suggested:

if (cursors.up.isDown){	//  The speed we'll travel at        currentSpeed = 300;}
else if (cursors.down.isDown){ 	//  The speed we'll travel at        currentSpeed = -300;}

Pressing the down arrow still does nothing. Seems simple enough, but I'm new to phaser. What am I missing here? Does it have to do with this?

if (currentSpeed > 0)
    {
        game.physics.arcade.velocityFromRotation(tank.rotation, currentSpeed, tank.body.velocity);
    }

 

[Janzen]

I figured out that currentSpeed can't be negative.

velocityFromRotation doesn't move the tank when currentSpeed is negative. Not sure why. Can I make it work somehow?

[Janzen]

Solved this by using P2 physics and the moveForward and moveBackward variables.

[gratis_reckon]

            if (cursors.up.isDown) {
                if (currentSpeed >= 300) {
                    currentSpeed = 300;
                } else {
                    currentSpeed += 20;
                }
            } else if (cursors.down.isDown) {
                if (currentSpeed <= -300) {
                    currentSpeed = -300;
                } else {
                    currentSpeed -= 20;
                }
            } else {
                if (currentSpeed > 10) {
                    currentSpeed -= 10;
                } else if (currentSpeed < -10) {
                    currentSpeed += 10;
                } else {
                    currentSpeed = 0;
                }
            }

            game.physics.arcade.velocityFromRotation(tank.rotation, currentSpeed, tank.body.velocity);

--------------------------

This worked for me.