Greenfoot

Applez

2018/5/10

#

Hi, I've made a speedometer in my car game and I've made code so that the needle stops at zero :

if (Greenfoot.isKeyDown("up") == false [code]&& getRotation() != 359)

        {
            turn(-1);
        }

But this means that i cant set a limit to the needle turning to the max speed (160). I tried

if (Greenfoot.isKeyDown("up") && getRotation() != 10)
        {
            turn(2);
        }

But that doesnt let the needle move far enough, anything less that 359 is in the blank area of the speedometer range (below zero). Please help thanks

Applez

2018/5/10

#

I Also have another problem, I want cars to spawn randomly in my endless scrolling world so that my main car can dodge it, I dont know how to do this since its in a borderless world. Even if i can randomly spawn the cars, i need to make them move to the left :

move(-1);

So that all the cars keep going left and my main car goes right and dodges them, if my main car touches the other cars, how can i delete my main car (to make it look like it crashed)? Thanks

danpost

2018/5/11

#

Applez wrote...

But that doesnt let the needle move far enough, anything less that 359 is in the blank area of the speedometer range (below zero).

Use '> 0' and '< 11' or higher.

Applez wrote...

if my main car touches the other cars, how can i delete my main car (to make it look like it crashed)?

if (isTouching(Car.class)) getWorld().removeObject(this);

Applez

2018/5/11

#

Thanks, and how do I make cars randomly spawn?

danpost

2018/5/11

#

Applez wrote...

Thanks, and how do I make cars randomly spawn?

Well, you probably do no want cars to spawn on each other, so using a random timer would probably be best. Something like this:

// add a timer field
private int spawnTimer;

// in action code
if (--spawnTimer < 0)
{
    getWorld().addObject(new Car(), << some x, some y >>);
    spawnTimer = 30+Greenfoot.getRandomNumber(150); // adjust values as needed
}

In line 8, the added value, 30, is the minimum delay time and the random part, 150 is the variable delay range beyond the initial 30.

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