code snippets Cloud :

public void onMouse(final MouseEvent a) {

        if (a.buttonstate && a.button == 0 && (mc.objectMouseOver == null || mc.objectMouseOver.entityHit == null) && findEnt(R) != null) {

            mc.playerController.attackEntity((EntityPlayer)mc.thePlayer, findEnt(R));

        }

    }



public static Entity findEnt(final double a) {

        final Minecraft minecraft;

        final Minecraft getMinecraft = minecraft = Minecraft.getMinecraft();

        final MovingObjectPosition rayTrace = getMinecraft.thePlayer.rayTrace(a, 1.0f);

        double distanceTo = a;

        final Vec3 getPosition = getMinecraft.thePlayer.getPosition(1.0f);

        if (rayTrace != null) {
            distanceTo = rayTrace.hitVec.distanceTo(getPosition);

        }

        final Minecraft minecraft2 = minecraft;

        final Vec3 getLook = minecraft2.thePlayer.getLook(1.0f);

        final Vec3 addVector = getPosition.addVector(getLook.xCoord * a, getLook.yCoord * a, getLook.zCoord * a);

        Entity entity = null;

        final float n = 1.0f;

        final WorldClient theWorld = minecraft2.theWorld;

        final Minecraft minecraft3 = minecraft;

        final List getEntitiesWithinAABBExcludingEntity = theWorld.getEntitiesWithinAABBExcludingEntity((Entity)minecraft3.thePlayer, minecraft3.thePlayer.boundingBox.addCoord(getLook.xCoord * a, getLook.yCoord * a, getLook.zCoord * a).expand(1.0, 1.0, 1.0));

        double n2 = distanceTo;

        int i;

        for (int n3 = i = 0; i < getEntitiesWithinAABBExcludingEntity.size(); i = ++n3) {

            final Entity entity2;

            if ((entity2 = (Entity) getEntitiesWithinAABBExcludingEntity.get(n3)).canBeCollidedWith()) {

                final Entity entity3 = entity2;

                final float getCollisionBorderSize = entity3.getCollisionBorderSize();

                final AxisAlignedBB expand = entity3.boundingBox.expand((double)getCollisionBorderSize, (double)getCollisionBorderSize, (double)getCollisionBorderSize);

                final MovingObjectPosition calculateIntercept = expand.calculateIntercept(getPosition, addVector);

                if (expand.isVecInside(getPosition)) {

                    if (0.0 < n2 || n2 == 0.0) {

                        entity = entity2;

                        n2 = 0.0;

                    }

                }

                else {

                    final double distanceTo2;

                    if (calculateIntercept != null && ((distanceTo2 = getPosition.distanceTo(calculateIntercept.hitVec)) < n2 || n2 == 0.0)) {

                        if (entity2 == minecraft.thePlayer.ridingEntity) {

                            if (n2 == 0.0) {

                                entity = entity2;

                            }

                       }else {

                            entity = entity2;

                            n2 = distanceTo2;

                        }

                    }

                }

            }

        }

        return entity;

    }