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Added Ray Trace class from code in the empire engine

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DarkGuardsman 2013-11-08 12:05:21 -05:00
parent 18fe6f072d
commit c6bcb4ce17
1 changed files with 134 additions and 0 deletions
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src/dark/core/prefab/helpers/RayTraceHelper.java Normal file
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package dark.core.prefab.helpers;
import java.util.List;
import net.minecraft.entity.Entity;
import net.minecraft.util.AxisAlignedBB;
import net.minecraft.util.MathHelper;
import net.minecraft.util.MovingObjectPosition;
import net.minecraft.util.Vec3;
import net.minecraft.world.World;
public class RayTraceHelper
{
public static MovingObjectPosition raytraceEntities(World world, Entity entity, Vec3 error, double reachDistance, boolean collisionFlag)
{
MovingObjectPosition pickedEntity = null;
Vec3 playerPosition = Vec3.createVectorHelper(entity.posX, entity.posY + entity.getEyeHeight(), entity.posZ);
Vec3 playerLook = entity.getLookVec();
Vec3 playerViewOffset = Vec3.createVectorHelper(playerPosition.xCoord + playerLook.xCoord * reachDistance + error.xCoord, playerPosition.yCoord + playerLook.yCoord * reachDistance + error.yCoord, playerPosition.zCoord + playerLook.zCoord * reachDistance + error.zCoord);
double playerBorder = 1.1 * reachDistance;
AxisAlignedBB boxToScan = entity.boundingBox.expand(playerBorder, playerBorder, playerBorder);
List entitiesHit = world.getEntitiesWithinAABBExcludingEntity(entity, boxToScan);
double closestEntity = reachDistance;
if (entitiesHit == null || entitiesHit.isEmpty())
{
return null;
}
for (Entity entityHit : (Iterable<Entity>) entitiesHit)
{
if (entityHit != null && entityHit.canBeCollidedWith() && entityHit.boundingBox != null)
{
float border = entityHit.getCollisionBorderSize();
AxisAlignedBB aabb = entityHit.boundingBox.expand(border, border, border);
MovingObjectPosition hitMOP = aabb.calculateIntercept(playerPosition, playerViewOffset);
if (hitMOP != null)
{
if (aabb.isVecInside(playerPosition))
{
if (0.0D < closestEntity || closestEntity == 0.0D)
{
pickedEntity = new MovingObjectPosition(entityHit);
if (pickedEntity != null)
{
pickedEntity.hitVec = hitMOP.hitVec;
closestEntity = 0.0D;
}
}
}
else
{
double distance = playerPosition.distanceTo(hitMOP.hitVec);
if (distance < closestEntity || closestEntity == 0.0D)
{
pickedEntity = new MovingObjectPosition(entityHit);
pickedEntity.hitVec = hitMOP.hitVec;
closestEntity = distance;
}
}
}
}
}
return pickedEntity;
}
public static MovingObjectPosition raytraceBlocks(World world, Entity entity, Vec3 error, double reachDistance, boolean collisionFlag)
{
Vec3 playerPosition = Vec3.createVectorHelper(entity.posX, entity.posY + entity.getEyeHeight(), entity.posZ);
Vec3 playerLook = entity.getLookVec();
Vec3 playerViewOffset = Vec3.createVectorHelper(playerPosition.xCoord + playerLook.xCoord * reachDistance + error.xCoord, playerPosition.yCoord + playerLook.yCoord * reachDistance + error.yCoord, playerPosition.zCoord + playerLook.zCoord * reachDistance + error.zCoord);
return world.rayTraceBlocks_do_do(playerPosition, playerViewOffset, collisionFlag, !collisionFlag);
}
public static MovingObjectPosition ray_trace_do(World world, Entity entity, Vec3 e, double reachDistance, boolean collisionFlag)
{
MovingObjectPosition hitBlock = raytraceBlocks(world, entity, e, reachDistance, collisionFlag);
MovingObjectPosition hitEntity = raytraceEntities(world, entity, e, reachDistance, collisionFlag);
if (hitEntity == null)
{
return hitBlock;
}
else if (hitBlock == null)
{
return hitEntity;
}
else
{
Vec3 playerPosition = Vec3.createVectorHelper(entity.posX, entity.posY + entity.getEyeHeight(), entity.posZ);
if (hitEntity.hitVec.distanceTo(playerPosition) < hitBlock.hitVec.distanceTo(playerPosition))
{
return hitEntity;
}
else
{
return hitBlock;
}
}
}
public static Vec3 getLook(Entity entity, float par1)
{
float f1;
float f2;
float f3;
float f4;
if (par1 == 1.0F)
{
f1 = MathHelper.cos(-entity.rotationYaw * 0.017453292F - (float) Math.PI);
f2 = MathHelper.sin(-entity.rotationYaw * 0.017453292F - (float) Math.PI);
f3 = -MathHelper.cos(-entity.rotationPitch * 0.017453292F);
f4 = MathHelper.sin(-entity.rotationPitch * 0.017453292F);
return entity.worldObj.getWorldVec3Pool().getVecFromPool((f2 * f3), f4, (f1 * f3));
}
else
{
f1 = entity.prevRotationPitch + (entity.rotationPitch - entity.prevRotationPitch) * par1;
f2 = entity.prevRotationYaw + (entity.rotationYaw - entity.prevRotationYaw) * par1;
f3 = MathHelper.cos(-f2 * 0.017453292F - (float) Math.PI);
f4 = MathHelper.sin(-f2 * 0.017453292F - (float) Math.PI);
float f5 = -MathHelper.cos(-f1 * 0.017453292F);
float f6 = MathHelper.sin(-f1 * 0.017453292F);
return entity.worldObj.getWorldVec3Pool().getVecFromPool((f4 * f5), f6, (f3 * f5));
}
}
}