Implementation of the EntityDamage*Events.

Many files were added to enable the correct hooking of these events, and a new
event EntityDamageByProjectileEvent. EntityDamageByProjectileEvent adds the
ability to get the projectile entity (such as an egg) and also set if the
projectile 'bounces'. Only two projectiles currently respond to bouncing, Arrow
and Fish - were if the fish bounces it means the fish is not hooked. Bouncing
is independent of any damage caused via the event. In addition, the changes to
EntityDamageEvent that enable setting post-event damage were implemented in all
hooks.

Finally, a bug in CraftArrow was fixed, where the constructor was not declared public.

1 files changed, 269 insertions, 0 deletions

diff --git a/src/main/java/net/minecraft/server/EntitySnowball.java b/src/main/java/net/minecraft/server/EntitySnowball.java
new file mode 100644
index 00000000..4e479d53
--- /dev/null
+++ b/src/main/java/net/minecraft/server/EntitySnowball.java
@@ -0,0 +1,269 @@
+package net.minecraft.server;
+
+import java.util.List;
+import java.util.Random;
+
+//CraftBukkit start
+import org.bukkit.craftbukkit.entity.CraftEntity;
+import org.bukkit.craftbukkit.entity.CraftLivingEntity;
+import org.bukkit.craftbukkit.CraftServer;
+import org.bukkit.craftbukkit.entity.CraftSnowball;
+import org.bukkit.event.entity.EntityDamageByProjectileEvent;
+import org.bukkit.event.entity.EntityDamageEvent;
+//CraftBukkit end
+
+public class EntitySnowball extends Entity {
+
+    private int b;
+    private int c;
+    private int d;
+    private int e;
+    private boolean f;
+    public int a;
+    private EntityLiving ak;
+    private int al;
+    private int am;
+
+    public EntitySnowball(World world) {
+        super(world);
+        b = -1;
+        c = -1;
+        d = -1;
+        e = 0;
+        f = false;
+        a = 0;
+        am = 0;
+        a(0.25F, 0.25F);
+    }
+
+    protected void a() {}
+
+    public EntitySnowball(World world, EntityLiving entityliving) {
+        super(world);
+        b = -1;
+        c = -1;
+        d = -1;
+        e = 0;
+        f = false;
+        a = 0;
+        am = 0;
+        ak = entityliving;
+        a(0.25F, 0.25F);
+        c(entityliving.p, entityliving.q + (double) entityliving.w(), entityliving.r, entityliving.v, entityliving.w);
+        p -= MathHelper.b((v / 180F) * 3.141593F) * 0.16F;
+        q -= 0.10000000149011612D;
+        r -= MathHelper.a((v / 180F) * 3.141593F) * 0.16F;
+        a(p, q, r);
+        H = 0.0F;
+        float f1 = 0.4F;
+
+        s = -MathHelper.a((v / 180F) * 3.141593F) * MathHelper.b((w / 180F) * 3.141593F) * f1;
+        u = MathHelper.b((v / 180F) * 3.141593F) * MathHelper.b((w / 180F) * 3.141593F) * f1;
+        t = -MathHelper.a((w / 180F) * 3.141593F) * f1;
+        a(s, t, u, 1.5F, 1.0F);
+    }
+
+    public EntitySnowball(World world, double d1, double d2, double d3) {
+        super(world);
+        b = -1;
+        c = -1;
+        d = -1;
+        e = 0;
+        f = false;
+        a = 0;
+        am = 0;
+        al = 0;
+        a(0.25F, 0.25F);
+        a(d1, d2, d3);
+        H = 0.0F;
+    }
+
+    public void a(double d1, double d2, double d3, float f1, float f2) {
+        float f3 = MathHelper.a(d1 * d1 + d2 * d2 + d3 * d3);
+
+        d1 /= f3;
+        d2 /= f3;
+        d3 /= f3;
+        d1 += W.nextGaussian() * 0.0074999998323619366D * (double) f2;
+        d2 += W.nextGaussian() * 0.0074999998323619366D * (double) f2;
+        d3 += W.nextGaussian() * 0.0074999998323619366D * (double) f2;
+        d1 *= f1;
+        d2 *= f1;
+        d3 *= f1;
+        s = d1;
+        t = d2;
+        u = d3;
+        float f4 = MathHelper.a(d1 * d1 + d3 * d3);
+
+        x = v = (float) ((Math.atan2(d1, d3) * 180D) / 3.1415927410125732D);
+        y = w = (float) ((Math.atan2(d2, f4) * 180D) / 3.1415927410125732D);
+        al = 0;
+    }
+
+    public void b_() {
+        O = p;
+        P = q;
+        Q = r;
+        super.b_();
+        if (a > 0) {
+            a--;
+        }
+        if (f) {
+            int i = this.l.a(b, c, d);
+
+            if (i != e) {
+                f = false;
+                s *= W.nextFloat() * 0.2F;
+                t *= W.nextFloat() * 0.2F;
+                u *= W.nextFloat() * 0.2F;
+                al = 0;
+                am = 0;
+            } else {
+                al++;
+                if (al == 1200) {
+                    q();
+                }
+                return;
+            }
+        } else {
+            am++;
+        }
+        Vec3D vec3d = Vec3D.b(p, q, r);
+        Vec3D vec3d1 = Vec3D.b(p + s, q + t, r + u);
+        MovingObjectPosition movingobjectposition = this.l.a(vec3d, vec3d1);
+
+        vec3d = Vec3D.b(p, q, r);
+        vec3d1 = Vec3D.b(p + s, q + t, r + u);
+        if (movingobjectposition != null) {
+            vec3d1 = Vec3D.b(movingobjectposition.f.a, movingobjectposition.f.b, movingobjectposition.f.c);
+        }
+        if (!this.l.z) {
+            Entity entity = null;
+            List list = this.l.b(((Entity) (this)), z.a(s, t, u).b(1.0D, 1.0D, 1.0D));
+            double d1 = 0.0D;
+
+            for (int k = 0; k < list.size(); k++) {
+                Entity entity1 = (Entity) list.get(k);
+
+                if (!entity1.c_() || entity1 == ak && am < 5) {
+                    continue;
+                }
+                float f4 = 0.3F;
+                AxisAlignedBB axisalignedbb = entity1.z.b(f4, f4, f4);
+                MovingObjectPosition movingobjectposition1 = axisalignedbb.a(vec3d, vec3d1);
+
+                if (movingobjectposition1 == null) {
+                    continue;
+                }
+                double d2 = vec3d.a(movingobjectposition1.f);
+
+                if (d2 < d1 || d1 == 0.0D) {
+                    entity = entity1;
+                    d1 = d2;
+                }
+            }
+
+            if (entity != null) {
+                movingobjectposition = new MovingObjectPosition(entity);
+            }
+        }
+        if (movingobjectposition != null) {
+            if (movingobjectposition.g != null) {
+                // CraftBukkit start
+                boolean bounce;
+                if (movingobjectposition.g instanceof EntityLiving) {
+                    CraftServer server = ((WorldServer) this.l).getServer();
+                    CraftEntity damagee = new CraftLivingEntity(server, (EntityLiving) movingobjectposition.g);
+                    CraftEntity damager = new CraftLivingEntity(server, ak);
+                    CraftEntity projectile = new CraftSnowball(server, (EntitySnowball) this);
+
+                    //TODO @see EntityArrow#162
+                    EntityDamageByProjectileEvent edbpe = new EntityDamageByProjectileEvent( damager, damagee, projectile, EntityDamageEvent.DamageCause.ENTITY_ATTACK, 0);
+
+                    server.getPluginManager().callEvent(edbpe);
+                    if(!edbpe.isCancelled()) {
+                        // this function returns if the snowball should stick or not, i.e. !bounce
+                        bounce = !movingobjectposition.g.a(((Entity) (ak)), edbpe.getDamage());
+                    } else {
+                        // event was cancelled, get if the snowball should bounce or not
+                        bounce = edbpe.getBounce();
+                    }
+                } else {
+                    bounce = !movingobjectposition.g.a(((Entity) (ak)), 0);
+                }
+                if (!bounce) {
+                    // CraftBukkit end
+                    ;
+                }
+            }
+            for (int j = 0; j < 8; j++) {
+                this.l.a("snowballpoof", p, q, r, 0.0D, 0.0D, 0.0D);
+            }
+
+            q();
+        }
+        p += s;
+        q += t;
+        r += u;
+        float f1 = MathHelper.a(s * s + u * u);
+
+        v = (float) ((Math.atan2(s, u) * 180D) / 3.1415927410125732D);
+        for (w = (float) ((Math.atan2(t, f1) * 180D) / 3.1415927410125732D); w - y < -180F; y -= 360F) {
+            ;
+        }
+        for (; w - y >= 180F; y += 360F) {
+            ;
+        }
+        for (; v - x < -180F; x -= 360F) {
+            ;
+        }
+        for (; v - x >= 180F; x += 360F) {
+            ;
+        }
+        w = y + (w - y) * 0.2F;
+        v = x + (v - x) * 0.2F;
+        float f2 = 0.99F;
+        float f5 = 0.03F;
+
+        if (v()) {
+            for (int l = 0; l < 4; l++) {
+                float f3 = 0.25F;
+
+                this.l.a("bubble", p - s * (double) f3, q - t * (double) f3, r - u * (double) f3, s, t, u);
+            }
+
+            f2 = 0.8F;
+        }
+        s *= f2;
+        t *= f2;
+        u *= f2;
+        t -= f5;
+        a(p, q, r);
+    }
+
+    public void a(NBTTagCompound nbttagcompound) {
+        nbttagcompound.a("xTile", (short) b);
+        nbttagcompound.a("yTile", (short) c);
+        nbttagcompound.a("zTile", (short) d);
+        nbttagcompound.a("inTile", (byte) e);
+        nbttagcompound.a("shake", (byte) a);
+        nbttagcompound.a("inGround", (byte) (f ? 1 : 0));
+    }
+
+    public void b(NBTTagCompound nbttagcompound) {
+        b = ((int) (nbttagcompound.c("xTile")));
+        c = ((int) (nbttagcompound.c("yTile")));
+        d = ((int) (nbttagcompound.c("zTile")));
+        e = nbttagcompound.b("inTile") & 0xff;
+        a = nbttagcompound.b("shake") & 0xff;
+        f = nbttagcompound.b("inGround") == 1;
+    }
+
+    public void b(EntityPlayer entityplayer) {
+        if (f && ak == entityplayer && a <= 0 && entityplayer.an.a(new ItemStack(Item.j, 1))) {
+            l.a(((Entity) (this)), "random.pop", 0.2F, ((W.nextFloat() - W.nextFloat()) * 0.7F + 1.0F) * 2.0F);
+            entityplayer.c(((Entity) (this)), 1);
+            q();
+        }
+    }
+}