start work on laser gun

Author: htmlcsjs

src/main/java/net/htmlcsjs/htmlTech/common/item/behaviors/LaserGunBehaviour.java

@@ -1,25 +1,119 @@
 package net.htmlcsjs.htmlTech.common.item.behaviors;
 
 import codechicken.lib.vec.Vector3;
+import com.google.common.base.Predicates;
 import gregtech.api.GTValues;
 import gregtech.api.items.metaitem.stats.IItemBehaviour;
 import gregtech.client.particle.GTLaserBeamParticle;
 import gregtech.client.particle.GTParticleManager;
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.EntityLivingBase;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.item.ItemStack;
-import net.minecraft.util.ActionResult;
-import net.minecraft.util.EnumActionResult;
-import net.minecraft.util.EnumHand;
-import net.minecraft.util.ResourceLocation;
+import net.minecraft.util.*;
+import net.minecraft.util.math.*;
 import net.minecraft.world.World;
 
+import java.util.List;
+
 public class LaserGunBehaviour implements IItemBehaviour {
+
+    private GTLaserBeamParticle particle;
+
     @Override
     public ActionResult<ItemStack> onItemRightClick(World world, EntityPlayer player, EnumHand hand) {
-        GTLaserBeamParticle particle = new GTLaserBeamParticle(world, Vector3.fromEntity(player), new Vector3(player.getLookVec()).add(0,-0.5,0).multiply(0,-1,0).multiply(100.1))
-                .setBody(new ResourceLocation(GTValues.MODID,"textures/fx/laser/laser.png")); // create a beam particle and set its texture.
+        RayTraceResult rayTracedLooking = rayTrace(player, 100, 1.0F, false, true);
+
+        if (particle != null) {
+            GTParticleManager.INSTANCE.clearAllEffects(true);
+        }
+        particle = new GTLaserBeamParticle(world, Vector3.fromEntity(player).add(0, player.getEyeHeight(), 0), Vector3.fromEntity(player).subtract(new Vector3(rayTracedLooking.hitVec)))
+                .setBody(new ResourceLocation(GTValues.MODID, "textures/fx/laser/laser.png")); // create a beam particle and set its texture.
         GTParticleManager.INSTANCE.addEffect(particle); // add it to the particle manager.
         ItemStack itemStack = player.getHeldItem(hand);
-        return ActionResult.newResult(EnumActionResult.SUCCESS, itemStack);
+        return ActionResult.newResult(EnumActionResult.PASS, itemStack);
     }
+
+    /**
+     * raytraces player, taken from https://github.com/Lach01298/QMD with permission
+     */
+    private RayTraceResult rayTrace(EntityLivingBase entity, double reachDistance, float partialTicks, boolean hitBlocks, boolean hitEntities) {
+        Vec3d eyesPos = entity.getPositionEyes(partialTicks);
+        Vec3d lookVec = entity.getLook(1.0F);
+        Vec3d rayVec = eyesPos.add(lookVec.scale(reachDistance));
+        Entity pointedEntity = null;
+        Vec3d hitVec = null;
+        RayTraceResult entityHit = null;
+        RayTraceResult blockHit = null;
+        RayTraceResult missHit = new RayTraceResult(RayTraceResult.Type.MISS, eyesPos.subtract(rayVec), EnumFacing.UP, new BlockPos(MathHelper.floor(eyesPos.subtract(rayVec).x), MathHelper.floor(eyesPos.subtract(rayVec).y), MathHelper.floor(eyesPos.subtract(rayVec).z)));
+
+        if (hitEntities) {
+            List<Entity> list = entity.world.getEntitiesInAABBexcluding(entity, entity.getEntityBoundingBox().expand(lookVec.x * reachDistance, lookVec.y * reachDistance, lookVec.z * reachDistance).grow(1.0D, 1.0D, 1.0D),
+                    Predicates.and(EntitySelectors.NOT_SPECTATING, entity12 -> entity12 != null && entity12.canBeCollidedWith()));
+
+            double d2 = reachDistance;
+
+            for (Entity entity1 : list) {
+                AxisAlignedBB axisalignedbb = entity1.getEntityBoundingBox().grow((double) entity1.getCollisionBorderSize());
+                RayTraceResult raytraceresult = axisalignedbb.calculateIntercept(eyesPos, rayVec);
+
+                if (axisalignedbb.contains(eyesPos)) {
+                    pointedEntity = entity1;
+                    hitVec = raytraceresult == null ? eyesPos : raytraceresult.hitVec;
+                } else if (raytraceresult != null) {
+                    double d3 = eyesPos.distanceTo(raytraceresult.hitVec);
+
+                    if (d3 < d2 || d2 == 0.0D) {
+                        if (entity1.getLowestRidingEntity() == entity.getLowestRidingEntity() && !entity1.canRiderInteract()) {
+                            if (d2 == 0.0D) {
+                                pointedEntity = entity1;
+                                hitVec = raytraceresult.hitVec;
+                            }
+                        } else {
+                            pointedEntity = entity1;
+                            hitVec = raytraceresult.hitVec;
+                            d2 = d3;
+                        }
+                    }
+                }
+            }
+            if (pointedEntity != null) {
+                entityHit = new RayTraceResult(pointedEntity, hitVec);
+            }
+        }
+
+        if (hitBlocks) {
+            blockHit = entity.world.rayTraceBlocks(eyesPos, rayVec, false, false, true);
+        }
+
+        double blockDistance = 0;
+        double entityDistance = 0;
+
+        if (entityHit != null) {
+            entityDistance = entityHit.hitVec.distanceTo(entity.getPositionVector());
+        }
+
+        if (blockHit != null) {
+            blockDistance = blockHit.hitVec.distanceTo(entity.getPositionVector());
+        }
+
+        if (hitEntities && hitBlocks) {
+            if (entityDistance < blockDistance && entityDistance > 0) {
+                return entityHit;
+            } else {
+                return blockHit;
+            }
+        } else if (hitEntities) {
+            if (entityHit == null) {
+                return missHit;
+            }
+            return entityHit;
+        } else {
+            if (blockHit == null) {
+                return missHit;
+            }
+            return blockHit;
+        }
+    }
+
 }

src/main/resources/assets/gregtech/models/item/metaitems/laser_gun.json

@@ -0,0 +1,6 @@
+{
+  "parent": "item/generated",
+  "textures": {
+    "layer0": "gregtech:items/metaitems/laser_gun"
+  }
+}

src/main/resources/assets/gregtech/textures/items/metaitems/laser_gun.png

@@ -0,0 +1,5 @@
+{
+  "animation": {
+    "frametime": 1
+  }
+}