Differences

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--- dev:abstract_elements [2014/09/23 19:03] – tsmall1
+++ dev:abstract_elements [2014/09/23 19:35] (current) – [Create abstract class] tsmall1
@@ Line 19: / Line 19: @@
 We should also not define ''GetDefaultPhysicsColor'', since the children will want to be different colors.
+We also cannot define **THE_INSTANCE**, since an abstract class cannot be instantiated.
 We need a behavior method which wanders the same for all children. This looks like:
@@ Line 29: / Line 31: @@
   MDist<R> md = MDist<R>::get();
   Dir d = (Dir)rand.Create(Dirs::DIR_COUNT);
-  u32 maxWanderDist = Dirs::IsCorner(d) ? R : (R / 2);
-  maxWanderDist = MAX(GetWanderDistance(), maxWanderDist);
-  Dirs::FillPoint(wanderPt, d);
+  Dirs::FillDir(wanderPt, d);
-  wanderPt *= maxWanderDist;
+  wanderPt *= Dirs::IsCorner(d) ? (GetWanderDistance() / 2) : GetWanderDistance();
-  if(window.GetRelativeAtom(wanderPt).GetType() ==
+  if(window.IsLiveSite(wanderPt))
-     Element_Empty<CC>::THE_INSTANCE.GetType())
   {
-    window.SwapAtoms(wanderPt, SPoint(0, 0));
+    if(window.GetRelativeAtom(wanderPt).GetType() ==
+       Element_Empty<CC>::THE_INSTANCE.GetType())
+       {
+         window.SwapAtoms(wanderPt, SPoint(0, 0));
+       }
+    }
   }
 }
@@ Line 51: / Line 54: @@
 ===== Create child classes =====
+Next, we need some child classes to inherit from this one. We will create two classes, which are nearly identical, to do this.
+First, each of these classes gets an ''ElementParameterS32'' named ''m_wanderDistance''. **These need to be initialized with unique tags!**
+Next, change the class definition and the constructor to use ''AbstractElement_Wanderer<CC>'' instead of ''Element<CC>''.
+Next, define ''DefaultPhysicsColor'' to return ''0xff00ffff'' for the Cyan element, and ''0xffff00ff'' for the Magenta element.
+Finally, define ''GetWanderDistance'' as such:
+<code>
+protected:
+ virtual u32 GetWanderDistance() const
+ {
+    return (u32)m_wanderDistance.GetValue();
+ }
+</code>