Add files from mc-dev for diff visibility

src/main/java/net/minecraft/server/ControllerLook.java

@@ -0,0 +1,83 @@
+package net.minecraft.server;
+
+public class ControllerLook {
+
+    private EntityLiving a;
+    private float b;
+    private float c;
+    private boolean d = false;
+    private double e;
+    private double f;
+    private double g;
+
+    public ControllerLook(EntityLiving entityliving) {
+        this.a = entityliving;
+    }
+
+    public void a(Entity entity, float f, float f1) {
+        this.e = entity.locX;
+        if (entity instanceof EntityLiving) {
+            this.f = entity.locY + (double) entity.getHeadHeight();
+        } else {
+            this.f = (entity.boundingBox.b + entity.boundingBox.e) / 2.0D;
+        }
+
+        this.g = entity.locZ;
+        this.b = f;
+        this.c = f1;
+        this.d = true;
+    }
+
+    public void a(double d0, double d1, double d2, float f, float f1) {
+        this.e = d0;
+        this.f = d1;
+        this.g = d2;
+        this.b = f;
+        this.c = f1;
+        this.d = true;
+    }
+
+    public void a() {
+        this.a.pitch = 0.0F;
+        if (this.d) {
+            this.d = false;
+            double d0 = this.e - this.a.locX;
+            double d1 = this.f - (this.a.locY + (double) this.a.getHeadHeight());
+            double d2 = this.g - this.a.locZ;
+            double d3 = (double) MathHelper.sqrt(d0 * d0 + d2 * d2);
+            float f = (float) (Math.atan2(d2, d0) * 180.0D / 3.1415927410125732D) - 90.0F;
+            float f1 = (float) (-(Math.atan2(d1, d3) * 180.0D / 3.1415927410125732D));
+
+            this.a.pitch = this.a(this.a.pitch, f1, this.c);
+            this.a.as = this.a(this.a.as, f, this.b);
+        } else {
+            this.a.as = this.a(this.a.as, this.a.aq, 10.0F);
+        }
+
+        float f2 = MathHelper.g(this.a.as - this.a.aq);
+
+        if (!this.a.getNavigation().f()) {
+            if (f2 < -75.0F) {
+                this.a.as = this.a.aq - 75.0F;
+            }
+
+            if (f2 > 75.0F) {
+                this.a.as = this.a.aq + 75.0F;
+            }
+        }
+    }
+
+    private float a(float f, float f1, float f2) {
+        float f3 = MathHelper.g(f1 - f);
+
+        if (f3 > f2) {
+            f3 = f2;
+        }
+
+        if (f3 < -f2) {
+            f3 = -f2;
+        }
+
+        return f + f3;
+    }
+}