I'm working on creating an Item in my custom mod that spawns a lightning bolt at whichever block the player right clicks on whilst holding a certain item.
The item works flawlessly when the player clicks on a block within their range (a block you could normally mine/interact with). However, when the player clicks a block out of that range, Minecraft crashes with a Null Pointer Exception.
If anyone could tell me what is causing this error, or might know a possible solution, I would be very much appreciative. Thanks!
The code:
package smith.tyler.hackCraft.item;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.entity.effect.EntityLightningBolt;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.util.MathHelper;
import net.minecraft.util.MovingObjectPosition;
import net.minecraft.util.Vec3;
import net.minecraft.world.World;
public class ForGiggles extends Item {
public ForGiggles(int par1) {
super(par1);
setUnlocalizedName("forGiggles");
setCreativeTab(CreativeTabs.tabMisc);
}
public ItemStack onItemRightClick(ItemStack itemStack, World world, EntityPlayer player){
MovingObjectPosition movingobjectposition = getMovingObjectPositionFromPlayer(world, player, false);
int x = movingobjectposition.blockX;
int y = movingobjectposition.blockY;
int z = movingobjectposition.blockZ;
world.spawnEntityInWorld(new EntityLightningBolt(world, x, y, z));
System.out.println("Target X: " + x);
System.out.println("Target Y: " + y);
System.out.println("Target Z: " + z);
return itemStack;
}
public MovingObjectPosition getMovingObjectPositionFromPlayer(World par1World, EntityPlayer par2EntityPlayer, boolean par3)
{
float f = 1.0F;
float f1 = par2EntityPlayer.prevRotationPitch + (par2EntityPlayer.rotationPitch - par2EntityPlayer.prevRotationPitch) * f;
float f2 = par2EntityPlayer.prevRotationYaw + (par2EntityPlayer.rotationYaw - par2EntityPlayer.prevRotationYaw) * f;
double d0 = par2EntityPlayer.prevPosX + (par2EntityPlayer.posX - par2EntityPlayer.prevPosX) * (double)f;
double d1 = par2EntityPlayer.prevPosY + (par2EntityPlayer.posY - par2EntityPlayer.prevPosY) * (double)f + (double)(par1World.isRemote ? par2EntityPlayer.getEyeHeight() - par2EntityPlayer.getDefaultEyeHeight() : par2EntityPlayer.getEyeHeight()); // isRemote check to revert changes to ray trace position due to adding the eye height clientside and player yOffset differences
double d2 = par2EntityPlayer.prevPosZ + (par2EntityPlayer.posZ - par2EntityPlayer.prevPosZ) * (double)f;
Vec3 vec3 = par1World.getWorldVec3Pool().getVecFromPool(d0, d1, d2);
float f3 = MathHelper.cos(-f2 * 0.017453292F - (float)Math.PI);
float f4 = MathHelper.sin(-f2 * 0.017453292F - (float)Math.PI);
float f5 = -MathHelper.cos(-f1 * 0.017453292F);
float f6 = MathHelper.sin(-f1 * 0.017453292F);
float f7 = f4 * f5;
float f8 = f3 * f5;
double d3 = 5.0D;
if (par2EntityPlayer instanceof EntityPlayerMP)
{
d3 = ((EntityPlayerMP)par2EntityPlayer).theItemInWorldManager.getBlockReachDistance();
}
Vec3 vec31 = vec3.addVector((double)f7 * d3, (double)f6 * d3, (double)f8 * d3);
return par1World.rayTraceBlocks_do_do(vec3, vec31, par3, !par3);
}
}
