[1.7.10] Changing texture based on item in Gui slot

[Choonster]

Create a

StaffInventory

instance from the

ItemStack

's NBT, then use the methods of

StaffInventory

to check the item in the slot.

[shmcrae]

So i did

 

public ItemStack stack; // I created a new ItemStack because it needed a parameter

StaffInventory staffInv = new StaffInventory(stack);

 

 

@Override

public IIcon getIconIndex(ItemStack itemstack)

{

        if(staffInv.getStackInSlot(0).equals(MItems.FireCrystal)

        {

                return staffTexture[staff.length];

        }

 

        else

        {

                return staffTexture[empty.length];

        }

}

 

[shmcrae]

Alright, i moved it in my getIconIndex method and used that ItemStack's parameter.

 

 

 

@Override

public IIcon getIconIndex(ItemStack itemstack)

{

      StaffInventory staffInv = new StaffInventory(itemstack);

      if(staffInv.getStackInSlot(0).equals(MItems.FireCrystal)

        {

                return staffTexture[staff.length];

        }

 

        else

        {

                return staffTexture[empty.length];

        }

}

 

 

[Choonster]

IInventory#getStackInSlot

returns an

ItemStack

,

MItems.FireCrystal

is an

Item

; so the two will never be equal.

 

You need to check that the

ItemStack

in the slot isn't

null

, then call

ItemStack#getItem

to get its

Item

.

Item

s are singletons (only one instance exists per item type), so they should be compared with

==

rather than the

equals

method.

[shmcrae]

 

@Override

public IIcon getIconIndex(ItemStack itemstack)

{

      StaffInventory staffInv = new StaffInventory(itemstack);

      if(staffInv.getStackInSlot(1) != null && itemstack.getItem() == MItems.FireCrystal)

        {

                return staffTexture[staff.length];

        }

 

        else

        {

                return staffTexture[empty.length];

        }

}

 

[Choonster]

Slot numbers are 0-based, like most things in Minecraft/Java. 0 is the first slot, 1 is the second.

 

Why are you using the lengths of two unrelated arrays as indexes to your icon array? Are you ever actually initialising the icon array?

[shmcrae]

I would have one array but i don't know how to switch between them

 

private IIcon[staffTexture];

private static String[] staff = new String[] {RefStrings.MODID + ":elementStaff_fire"};

private static String[] empty = new String[] {RefStrings.MODID + ":elementStaff_empty"};

[Choonster]

You really need to read up on the basics of Java, including how arrays work. What you posted won't even compile.

 

You need two fields here: a

String

array containing the names of both icons (set in the field initialiser) and an

IIcon

array containing the icons (not set in the field initialiser).

 

In your override of

Item#registerIcons

, do the following:

• Set the icon array field to a new array of the same length as the icon name array
  
• Iterate through the icon name array, calling

  IIconRegister#registerIcon

  for each icon name and storing the returned

  IIcon

  in the same index of the icon array
  

 

In your override of

Item#getIconIndex

, return the appropriate

IIcon

from the icon array (i.e. the one at index 0 or 1).

 

Since you only have two icons, you could also use two separate

IIcon

fields instead of an array.

[Draco18s]

You really need to go learn programming before modding.  What you are trying to do is really quite straight forward.

 

This won't solve your problem, but it will show you how I handled something similar.

 

	@Override
public IIcon getIcon(ItemStack stack, int pass)
    {
	IIcon i = itemIcon;
	if(pass == 0) {
		if(stack.stackTagCompound == null) {
			return itemIcon;
		}
		i = (IIcon) ArtifactsAPI.itemicons.icons.get(stack.stackTagCompound.getString("icon").toLowerCase());
		if(i == null) {
			i = itemIcon;
		}
	}
	else {
		if(stack.stackTagCompound == null) {
			return (IIcon) ArtifactsAPI.itemicons.icons.get("overlay_artifact1");
		}
		i = (IIcon) ArtifactsAPI.itemicons.icons.get("overlay_"+stack.stackTagCompound.getString("icon").toLowerCase());
		if(i == null) {
			i = (IIcon) ArtifactsAPI.itemicons.icons.get("overlay_artifact1");
		}
	}
	return i;
    }