[1.12] Increase Minecart speed

[Dongle12]

I am looking at increasing the maximum speed of a minecart, but EntityMinecart class doesn't have a way to set the max speed, only get. Would there be an easier way to simply change the max speed of the cart, or do I have to create a new Entity class, override the function, and then spawn in the custom cart in place of the default one? If the latter is true, can anyone point me to a good tutorial on registering entity's and spawning them in? I have seen other tutorials on the registering entities, but they all deal with mobs and I don't think mobs and carts are the same entities.

[Draco18s]

Does the function return a hardcoded value or does it reference a field?

If it references a field you can use reflection to modify it.

If not, you'll have to make your own Minecart entity class.  Keep in mind however, that any subclasses of EntityMinecart that already exist will not see your adjustment.

Edited January 3, 2018 by Draco18s

[lethinh]

3 hours ago, Dongle12 said:

I am looking at increasing the maximum speed of a minecart, but EntityMinecart class doesn't have a way to set the max speed, only get. Would there be an easier way to simply change the max speed of the cart, or do I have to create a new Entity class, override the function, and then spawn in the custom cart in place of the default one? If the latter is true, can anyone point me to a good tutorial on registering entity's and spawning them in? I have seen other tutorials on the registering entities, but they all deal with mobs and I don't think mobs and carts are the same entities.

You should use Minecraft.getMinecraft().timer.timerSpeed

[Dongle12]

9 hours ago, Draco18s said:

Does the function return a hardcoded value or does it reference a field?

If it references a field you can use reflection to modify it.

The EntityMinecart class has this function: 

    public float getMaxCartSpeedOnRail()
    {
        return 1.2f;
    }

 That does return a static value, and that function is used here:

    public final void setCurrentCartSpeedCapOnRail(float value)
    {
        value = Math.min(value, getMaxCartSpeedOnRail());
        currentSpeedRail = value;
    }

in order to limit the actual speed.

 

I have looked at reflection for both these functions, but I can't find the SRG name for either function, and all the tutorials for ReflectionHelper use the SRG names. I'm not sure if that has changed with newer versions of MC, or if ReflectionHelper does in fact still need the SRG when I use it. I have gone through all the MCP names with no luck of finding the names. Is there some debug I can do manually in eclipse to get the SRG name of the functions?

[Draco18s]

10 hours ago, Draco18s said:

If not...

It does not

10 hours ago, Draco18s said:

you'll have to make your own Minecart entity class.  Keep in mind however, that any subclasses of EntityMinecart that already exist will not see your adjustment.

 

[Dongle12]

4 minutes ago, Draco18s said:

It does not

 

Alright thanks, I suspected as much.