[1.8.9] Changing the Values of Bow Damage

NovaViper · February 12, 2016

Is there anyway to modify the amount of damage bows deal? I'm making custom bows and making a wikia page for them and I'm curious if the bow damage can be changed at all.

Choonster · February 13, 2016

The damage dealt by arrows is calculated in

EntityArrow#onUpdate

, which uses values set in

ItemBow#onPlayerStoppedUsing

. You can override these methods in your own classes to do whatever you want.

NovaViper · February 13, 2016

Thanks and one other thing, is there a way to make the bows continuously shoot?

Choonster · February 13, 2016

Set the maximum use duration to 0, the use action to

NONE

and fire the arrows from

Item#onItemRightClick

instead of

Item#onItemUseFinish

.

NovaViper · February 13, 2016

There's nothing in onItemUseFinish, do I use the stuff thats in onPlayerStoppedUsing?

Choonster · February 13, 2016

Ah, I got a bit confused. That is indeed the method I meant.

NovaViper · February 13, 2016

Ok.. I got the method changed and got it continously firing.. Now how do I decrease that firing rate? I want it like the Draconic Bow in Draconic Evolution?

Choonster · February 13, 2016

You need to store the last use time (

World#getTotalWorldTime

) in the NBT and compare it against the current time in

Item#onItemRightClick

. If it's been at least

COOLDOWN

ticks, update the last use time and fire the arrow.

I have an example of a similar weapon here that fires snowballs at a fixed rate while right click is held.

NovaViper · February 13, 2016

What do I do with the other events in the arrow? So far I have the code like this but I'm not sure wthat to do with the rest

package novaviper.tetracraft.common.item;

import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.enchantment.Enchantment;
import net.minecraft.enchantment.EnchantmentHelper;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.projectile.EntityArrow;
import net.minecraft.init.Items;
import net.minecraft.item.EnumAction;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagLong;
import net.minecraft.stats.StatList;
import net.minecraft.world.World;

/**
* Created by NovaViper on 2/12/2016.
* Class Purpose:
*/
public class ItemContinousBow extends ItemModBow{
int fireRate;

public ItemContinousBow(String unlocalizedName, CreativeTabs tab, String type, int damage, int fireRate) {
	super(unlocalizedName, tab, type, damage);
	this.fireRate = fireRate;
}

/**
 * Has it been at least FIRE_RATE ticks since the bow was last used?
 *
 * @param stack The launcher ItemStack
 * @param world The World to check the time against
 * @return True if the ItemStack was last used at least FIRE_RATE ticks ago or if it has never been used
 */
private boolean isOffCooldown(ItemStack stack, World world) {
	return !stack.hasTagCompound() || (world.getTotalWorldTime() - stack.getTagCompound().getLong("lastUsage")) >= fireRate;
}

/**
 * Set the bow's last use time to the specified time.
 *
 * @param stack The bow ItemStack
 * @param time  The time
 */
private void setLastUsage(ItemStack stack, long time) {
	stack.setTagInfo("lastUsage", new NBTTagLong(time));
}

/**
 * Does the player need ammunition to fire the bows?
 *
 * @param stack  The bow ItemStack
 * @param player The player to check
 * @return True if the player is not in creative mode and the launcher doesn't have the Infinity enchantment
 */
private boolean playerNeedsAmmo(ItemStack stack, EntityPlayer player) {
	return !player.capabilities.isCreativeMode && EnchantmentHelper.getEnchantmentLevel(Enchantment.infinity.effectId, stack) == 0;
}

/**
 * How long it takes to use or consume an item
 */
@Override
public int getMaxItemUseDuration(ItemStack stack)
{
	return 20;
}

/**
 * returns the action that specifies what animation to play when the items is being used
 */
@Override
public EnumAction getItemUseAction(ItemStack stack)
{
	return EnumAction.BOW;
}

/**
 * Called whenever this item is equipped and the right mouse button is pressed. Args: itemStack, world, entityPlayer
 */
@Override
public ItemStack onItemRightClick(ItemStack stack, World worldIn, EntityPlayer playerIn)
{

	boolean cooldownOfff = isOffCooldown(stack, worldIn);
	boolean needsAmmo = playerNeedsAmmo(stack, playerIn);
	{

		if (cooldownOfff && (!needsAmmo || playerIn.inventory.consumeInventoryItem(Items.arrow))) {
			setLastUsage(stack, worldIn.getTotalWorldTime());
			net.minecraftforge.event.entity.player.ArrowLooseEvent event = new net.minecraftforge.event.entity.player.ArrowLooseEvent(playerIn, stack, i);
			if (net.minecraftforge.common.MinecraftForge.EVENT_BUS.post(event)) return null;
			i = event.charge;
			float f = (float) i / 20.0F;
			f = (f * f + f * 2.0F) / 3.0F;

			if ((double) f < 0.1D) {
				return null;
			}

			if (f > 1.0F) {
				f = 1.0F;
			}

			EntityArrow entityarrow = new EntityArrow(worldIn, playerIn, f * 2.0F);

			if (f == 1.0F) {
				entityarrow.setIsCritical(true);
			}

			int j = EnchantmentHelper.getEnchantmentLevel(Enchantment.power.effectId, stack);

			if (j > 0) {
				entityarrow.setDamage(entityarrow.getDamage() + (double) j * 0.5D + 0.5D);
			}

			int k = EnchantmentHelper.getEnchantmentLevel(Enchantment.punch.effectId, stack);

			if (k > 0) {
				entityarrow.setKnockbackStrength(k);
			}

			if (EnchantmentHelper.getEnchantmentLevel(Enchantment.flame.effectId, stack) > 0) {
				entityarrow.setFire(100);
			}

			stack.damageItem(1, playerIn);
			worldIn.playSoundAtEntity(playerIn, "random.bow", 1.0F, 1.0F / (itemRand.nextFloat() * 0.4F + 1.2F) + f * 0.5F);

			if (flag) {
				entityarrow.canBePickedUp = 2;
			} else {
				playerIn.inventory.consumeInventoryItem(Items.arrow);
			}

			playerIn.triggerAchievement(StatList.objectUseStats[item.getIdFromItem(this)]);

			if (!worldIn.isRemote) {
				worldIn.spawnEntityInWorld(entityarrow);
			}
		}
	}
	return stack;
}
}

Choonster · February 13, 2016

You've got a block (pair of braces) surrounding the

if

statement, which isn't required.

You don't need to consume an arrow in the body of the

if

statement, the

InventoryPlayer#consumeInventoryItem

call in the conditional already does that.

There's no point in setting the maximum use duration (

Item#getMaxItemUseDuration

) and use action (

Item#getItemUseAction

) if you never set the item in use (

EntityPlayer#setItemInUse

).

You should rename the variables in

onItemRightClick

with meaningful names that describe their purpose, e.g.

charge

instead if

(because that holds the bow's charge).

You never declare the variable

.

What is it that want to know?

NovaViper · February 13, 2016

I was asking about the usage time for the charge, the default one takes the maxUse and subtracts it by the time. Do I use the worldTime instead of the useTime?

Choonster · February 13, 2016

Since the player doesn't actually draw back your bow like they do with the vanilla one, I'd just use a fixed charge value.

NovaViper · February 14, 2016

Alright.. I got everything up, now I need help modding the textures

package novaviper.tetracraft.common.item;

import net.minecraft.client.resources.model.ModelResourceLocation;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.enchantment.Enchantment;
import net.minecraft.enchantment.EnchantmentHelper;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.projectile.EntityArrow;
import net.minecraft.init.Items;
import net.minecraft.item.EnumAction;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagLong;
import net.minecraft.stats.StatList;
import net.minecraft.world.World;
import novaviper.tetracraft.common.lib.ModelJsonReference;

/**
* Created by NovaViper on 2/12/2016.
* Class Purpose:
*/
public class ItemContinousBow extends ItemModBow{
int fireRate;

public ItemContinousBow(String unlocalizedName, CreativeTabs tab, String type, int damage, int fireRate) {
	super(unlocalizedName, tab, type, damage);
	this.fireRate = fireRate;
}

/**
 * Has it been at least FIRE_RATE ticks since thebowr was last used?
 *
 * @param stack The launcher ItemStack
 * @param world The World to check the time against
 * @return True if the ItemStack was last used at least FIRE_RATE ticks ago or if it has never been used
 */
private boolean isOffCooldown(ItemStack stack, World world) {
	return !stack.hasTagCompound() || (world.getTotalWorldTime() - stack.getTagCompound().getLong("lastUsage")) >=fireRate;
}

/**
 * Set thbower's last use time to the specified time.
 *
 * @param stack Thbower ItemStack
 * @param time  The time
 */
private void setLastUsage(ItemStack stack, long time) {
	stack.setTagInfo("lastUsage", new NBTTagLong(time));
}

/**
 * Does the player need ammunition to fire tbowsher?
 *
 * @param stack  Tbowher ItemStack
 * @param player The player to check
 * @return True if the player is not in creative mode and the launcher doesn't have the Infinity enchantment
 */
private boolean playerNeedsAmmo(ItemStack stack, EntityPlayer player) {
	return !player.capabilities.isCreativeMode && EnchantmentHelper.getEnchantmentLevel(Enchantment.infinity.effectId, stack) == 0;
}

/**
 * How long it takes to use or consume an item
 */
@Override
public int getMaxItemUseDuration(ItemStack stack){return 0;}

/**
 * returns the action that specifies what animation to play when the items is being used
 */
@Override
public EnumAction getItemUseAction(ItemStack stack)
{
	return EnumAction.BOW;
}

@Override
public ModelResourceLocation getModel(ItemStack stack, EntityPlayer player, int useRemaining) {
	ModelResourceLocation modelresourcelocation = new ModelResourceLocation(ModelJsonReference.getBowStandbyModel(bowType), "inventory");

	//System.out.println(player.getItemInUse() +":" + useRemaining); //USE FOR DEBUGGING ONLY

	if (stack.getItem() == this && player.getItemInUse() != null) {
		if (useRemaining >= 71987) {
			modelresourcelocation = new ModelResourceLocation(ModelJsonReference.getBowPullingModel(bowType, "0"), "inventory");
		}
		else if (useRemaining > 71980) {
			modelresourcelocation = new ModelResourceLocation(ModelJsonReference.getBowPullingModel(bowType, "1"), "inventory");
		}
		else if (useRemaining <= 71976 || useRemaining >= 71976) {
			modelresourcelocation = new ModelResourceLocation(ModelJsonReference.getBowPullingModel(bowType, "2"), "inventory");
		}
	}
	return modelresourcelocation;
}

/**
 * Called whenever this item is equipped and the right mouse button is pressed. Args: itemStack, world, entityPlayer
 */
@Override
public ItemStack onItemRightClick(ItemStack itemStackIn, World worldIn, EntityPlayer playerIn)
{

	boolean offCooldown = isOffCooldown(itemStackIn, worldIn);
	boolean needsAmmo = playerNeedsAmmo(itemStackIn, playerIn);
	{

		if (offCooldown && (!needsAmmo || playerIn.inventory.consumeInventoryItem(Items.arrow))) {
			setLastUsage(itemStackIn, worldIn.getTotalWorldTime());
			net.minecraftforge.event.entity.player.ArrowLooseEvent event = new net.minecraftforge.event.entity.player.ArrowLooseEvent(playerIn, itemStackIn, fireRate);
			if (net.minecraftforge.common.MinecraftForge.EVENT_BUS.post(event)) return null;
			int charge = event.charge + 15;
			float charge2 = (float) charge / 20.0F;
			charge2 = (charge2 * charge2 + charge2 * 2.0F) / 3.0F;

			if ((double) charge2 < 0.1D) {
				return null;
			}

			if (charge2 > 1.0F) {
				charge2 = 1.0F;
			}

			EntityArrow entityarrow = new EntityArrow(worldIn, playerIn, charge2 * 2.0F);
			int j = EnchantmentHelper.getEnchantmentLevel(Enchantment.power.effectId, itemStackIn);
			entityarrow.setIsCritical(true);

			if (j > 0) {
				entityarrow.setDamage(entityarrow.getDamage() + (double) j * 0.5D + 0.5D);
			}

			int k = EnchantmentHelper.getEnchantmentLevel(Enchantment.punch.effectId, itemStackIn);

			if (k > 0) {
				entityarrow.setKnockbackStrength(k);
			}

			if (EnchantmentHelper.getEnchantmentLevel(Enchantment.flame.effectId, itemStackIn) > 0) {
				entityarrow.setFire(100);
			}

			itemStackIn.damageItem(1, playerIn);
			worldIn.playSoundAtEntity(playerIn, "random.bow", 1.0F, 1.0F / (itemRand.nextFloat() * 0.4F + 1.2F) + charge2 * 0.5F);

			playerIn.triggerAchievement(StatList.objectUseStats[item.getIdFromItem(this)]);

			if (!worldIn.isRemote) {
				worldIn.spawnEntityInWorld(entityarrow);
			}
		}
	}
	return itemStackIn;
}
}

Choonster · February 14, 2016

Just register a model for the bow like you would any other item (

ModelBakery.registerItemVariants

and

ModelLoader.setCustomModelResourceLocation

or

ModelLoader.setCustomMeshDefinition

). Since it's never set in use, the pulling models will never be used.

NovaViper · February 14, 2016

Ah, ok. I thought I could make the textures load like normal bows but just quicker

Choonster · February 14, 2016

If you set the item in use from

Item#onItemRightClick

, the pulling models returned by

Item#getModel

will be used (you can adjust the timings for each model in that method). Just make sure you override

Item#onItemUseStopped

to do nothing.

NovaViper · February 14, 2016

I'm using the setUsage method like the one in your rocket launcher, do I use the data from the methods I used?

Choonster · February 14, 2016

Call

EntityPlayer#setItemInUse

from

Item#onItemRightClick

like

ItemBow

does.

NovaViper · February 18, 2016

Sorry for taking a while to respond, been busy and I put the method in but still having texture issues

package novaviper.tetracraft.common.item;

import net.minecraft.client.resources.model.ModelResourceLocation;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.enchantment.Enchantment;
import net.minecraft.enchantment.EnchantmentHelper;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.projectile.EntityArrow;
import net.minecraft.init.Items;
import net.minecraft.item.EnumAction;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagLong;
import net.minecraft.stats.StatList;
import net.minecraft.world.World;
import novaviper.tetracraft.common.lib.ModelJsonReference;

/**
* Created by NovaViper on 2/12/2016.
* Class Purpose:
*/
public class ItemContinousBow extends ItemModBow{
int fireRate;
//int using;

public ItemContinousBow(String unlocalizedName, CreativeTabs tab, String type, int damage, int fireRate) {
	super(unlocalizedName, tab, type, damage);
	this.fireRate = fireRate;
}

/**
 * Has it been at least FIRE_RATE ticks since thebowr was last used?
 *
 * @param stack The launcher ItemStack
 * @param world The World to check the time against
 * @return True if the ItemStack was last used at least FIRE_RATE ticks ago or if it has never been used
 */
private boolean isOffCooldown(ItemStack stack, World world) {
	return !stack.hasTagCompound() || (world.getTotalWorldTime() - stack.getTagCompound().getLong("lastUsage")) >=fireRate;
}

/**
 * Set thbower's last use time to the specified time.
 *
 * @param stack Thbower ItemStack
 * @param time  The time
 */
private void setLastUsage(ItemStack stack, long time) {
	stack.setTagInfo("lastUsage", new NBTTagLong(time));
}

/**
 * Does the player need ammunition to fire tbowsher?
 *
 * @param stack  Tbowher ItemStack
 * @param player The player to check
 * @return True if the player is not in creative mode and the launcher doesn't have the Infinity enchantment
 */
private boolean playerNeedsAmmo(ItemStack stack, EntityPlayer player) {
	return !player.capabilities.isCreativeMode && EnchantmentHelper.getEnchantmentLevel(Enchantment.infinity.effectId, stack) == 0;
}

/**
 * How long it takes to use or consume an item
 */
@Override
public int getMaxItemUseDuration(ItemStack stack){return 10;}

/**
 * returns the action that specifies what animation to play when the items is being used
 */
@Override
public EnumAction getItemUseAction(ItemStack stack)
{
	return EnumAction.BOW;
}

@Override
public ModelResourceLocation getModel(ItemStack stack, EntityPlayer player, int useRemaining) {
	ModelResourceLocation modelresourcelocation = new ModelResourceLocation(ModelJsonReference.getBowStandbyModel(bowType), "inventory");

	//System.out.println(player.getItemInUse() +":" + useRemaining); //USE FOR DEBUGGING ONLY

	if (stack.getItem() == this && isOffCooldown(stack, player.getEntityWorld() )) {
		if (useRemaining >= 9) {
			modelresourcelocation = new ModelResourceLocation(ModelJsonReference.getBowPullingModel(bowType, "0"), "inventory");
		}
		else if (useRemaining > 6) {
			modelresourcelocation = new ModelResourceLocation(ModelJsonReference.getBowPullingModel(bowType, "1"), "inventory");
		}
		else if (useRemaining <= 4 || useRemaining >= 3) {
			modelresourcelocation = new ModelResourceLocation(ModelJsonReference.getBowPullingModel(bowType, "2"), "inventory");
		}
	}
	return modelresourcelocation;
}

/**
 * Called whenever this item is equipped and the right mouse button is pressed. Args: itemStack, world, entityPlayer
 */
@Override
public ItemStack onItemRightClick(ItemStack itemStackIn, World worldIn, EntityPlayer playerIn)
{

	boolean offCooldown = isOffCooldown(itemStackIn, worldIn);
	boolean needsAmmo = playerNeedsAmmo(itemStackIn, playerIn);
	{

		if (offCooldown && (!needsAmmo || playerIn.inventory.consumeInventoryItem(Items.arrow))) {
			setLastUsage(itemStackIn, worldIn.getTotalWorldTime());
			playerIn.setItemInUse(itemStackIn, this.getMaxItemUseDuration(itemStackIn));
			net.minecraftforge.event.entity.player.ArrowLooseEvent event = new net.minecraftforge.event.entity.player.ArrowLooseEvent(playerIn, itemStackIn, fireRate);
			if (net.minecraftforge.common.MinecraftForge.EVENT_BUS.post(event)) return null;
			int charge = event.charge + 15;
			float charge2 = (float) charge / 20.0F;
			charge2 = (charge2 * charge2 + charge2 * 2.0F) / 3.0F;

			if ((double) charge2 < 0.1D) {
				return null;
			}

			if (charge2 > 1.0F) {
				charge2 = 1.0F;
			}

			EntityArrow entityarrow = new EntityArrow(worldIn, playerIn, charge2 * 2.0F);
			int j = EnchantmentHelper.getEnchantmentLevel(Enchantment.power.effectId, itemStackIn);
			entityarrow.setIsCritical(true);

			if (j > 0) {
				entityarrow.setDamage(entityarrow.getDamage() + (double) j * 0.5D + 0.5D);
			}

			int k = EnchantmentHelper.getEnchantmentLevel(Enchantment.punch.effectId, itemStackIn);

			if (k > 0) {
				entityarrow.setKnockbackStrength(k);
			}

			if (EnchantmentHelper.getEnchantmentLevel(Enchantment.flame.effectId, itemStackIn) > 0) {
				entityarrow.setFire(100);
			}

			itemStackIn.damageItem(1, playerIn);
			worldIn.playSoundAtEntity(playerIn, "random.bow", 1.0F, 1.0F / (itemRand.nextFloat() * 0.4F + 1.2F) + charge2 * 0.5F);

			playerIn.triggerAchievement(StatList.objectUseStats[item.getIdFromItem(this)]);

			if (!worldIn.isRemote) {
				worldIn.spawnEntityInWorld(entityarrow);
			}
		}
	}
	return itemStackIn;
}
}

NovaViper · February 19, 2016

Alright, I got the method in but I can't seem to get the timing of the textures correct

coolAlias · February 19, 2016

Timing is as follows:

int ticks = stack.getMaxItemUseDuration() - useRemaining;
int iconIndex = (ticks > 17 ? 3 : ticks > 13 ? 2 : ticks > 0 ? 1 : 0);

Where iconIndex is the integer variation of the model location to retrieve.

Choonster · February 19, 2016

If you want to fire arrows continuously but still have the player draw back the bow, it may be better to fire them from

Item#onItemUseFinish

and

Item#onPlayerStoppedUsing

instead of from

Item#onItemRightClick

with a cooldown.

I've written an example of this here (parent class).

Draco18s · February 19, 2016

Just to jump in real quick.

You've got a block (pair of braces) surrounding the
if
statement, which isn't required.

While not required, there are totally legitimate reasons to do untyped code blocks.

I was working on something just the other week where I wanted to tab stuff in just to reduce the mental gymnastics necessary to understand what it was doing, and the IDE kept untabbing it, so I said "fuck it, code block."

Incidentally, code blocks also add another level of local scope.

int v = 1;
{
    int v = 2;
    System.out.println("v is " + v); //prints 2
}

NovaViper · February 20, 2016

If you want to fire arrows continuously but still have the player draw back the bow, it may be better to fire them from
Item#onItemUseFinish
and
Item#onPlayerStoppedUsing
instead of from
Item#onItemRightClick
with a cooldown.

I've written an example of this here (parent class).

I tried out the methods you made and they work perfectly (I did put your name next to them so I won't steal the credit from you)

NovaViper · March 2, 2016

Oh, I did forgot to ask one question (sorry if this counts as bumping, I just want it to stay in the same thread in case someone comes across this) I did finally manage to figure out how to set the damage of the bows. Now my question is how do I know the number im putting in is the acutal damage that an entity takes?

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[1.8.9] Changing the Values of Bow Damage

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