Differences

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--- dev:element_tutorial [2014/09/04 20:51] – ackley
+++ dev:element_tutorial [2014/09/17 20:00] (current) – [Create the C++ Compilation file] tsmall1
@@ Line 1: / Line 1: @@
 ====== Creating an MFM Element ======
-**NOTE THESE INSTRUCTIONS ARE FOR THE SOON-TO-BE RELEASED v2.0.8!  THEY WILL NOT WORK FOR MFM2.0.6!**
 **You will need to have the MFM ready to build from source to do this.** Follow the instructions at [[Dev:clone_from_github|Cloning from Github]] if you have not done so yet.
@@ Line 29: / Line 27: @@
 <code>
-MFMv2/src/elements/src/Element_Creg.h
+MFMv2/src/elements/src/Element_Creg.cpp
 </code>
@@ Line 59: / Line 57: @@
 m_targetDensity(this, "density", "Target Density",
                       "The Creg will try to fill this many spots in its event "
-                      "window with other Creg.", 0, 3, 45, 1)
+                      "window with other Creg.", 0, 3, 41, 1)
 </code>
@@ Line 96: / Line 94: @@
 virtual void Behavior(EventWindow<CC>& window) const
 {
-  const MDist<R> md = MDist<R>::get();
+      const MDist<R> md = MDist<R>::get();
-  u32 cregCount = 0;
+      Random& rand = window.GetRandom();
-  u32 fulli = 0, empti = 0;
-  SPoint fulls[50] = {SPoint(-1, -1)};
+      SPoint cregAtom;
-  SPoint empts[50] = {SPoint(-1, -1)};
+      s32 cregCount = 0;
+      SPoint nonCregAtom;
-  for(u32 i = md.GetFirstIndex(1); i <= md.GetLastIndex(R); i++)
+      s32 nonCregCount = 0;
-  {
-    const SPoint& rel = md.GetPoint(i);
+      for(u32 i = md.GetFirstIndex(0); i <= md.GetLastIndex(R); i++)
-    const T& atom = window.GetRelativeAtom(rel);
+      {
-    if(Atom<CC>::IsType(atom, Element<CC>::GetType()))
+        const SPoint& rel = md.GetPoint(i);
-    {
+        const T& atom = window.GetRelativeAtom(rel);
-      cregCount++;
+        if(Atom<CC>::IsType(atom, Element<CC>::GetType()))
-      fulls[fulli++] = rel;
+        {
-    }
+          cregCount++;
-    else
+          if(rand.OneIn(cregCount))
-    {
+          {
-      empts[empti++] = rel;
+            cregAtom = rel;
+          }
+        }
+        else
+        {
+          nonCregCount++;
+          if(rand.OneIn(nonCregCount))
+          {
+            nonCregAtom = rel;
+          }
+        }
+      }
+      if(cregCount > m_targetDensity.GetValue())
+      {
+        window.SetRelativeAtom(cregAtom,
+        Element_Empty<CC>::THE_INSTANCE.GetDefaultAtom());
+      }
+      else if(cregCount < m_targetDensity.GetValue())
+      {
+        window.SetRelativeAtom(nonCregAtom,
+        Element_Creg<CC>::THE_INSTANCE.GetDefaultAtom());
+      }
     }
-  }
-  u32 nidx;
-  if(cregCount > m_targetDensity.GetValue())
-  {
-    nidx = window.GetRandom().Create(fulli);
-    window.SetRelativeAtom(fulls[nidx],
-                           Element_Empty<CC>::THE_INSTANCE.GetDefaultAtom());
-  }
-  else
-  {
-    nidx = window.GetRandom().Create(empti);
-    window.SetRelativeAtom(empts[nidx],
-                           Element_Empty<CC>::THE_INSTANCE.GetDefaultAtom());
-  }
 }
 </code>
@@ Line 136: / Line 141: @@
 If the number of Cregs is greater than the thresold, it will delete one of the elements that isn't a Creg. Otherwise, it will delete one that is a Creg.
-===== Register Element with a Driver =====
+===== Register Element witn StdElement.inc =====
 Open:
@@ Line 144: / Line 150: @@
 </code>
-Add the line:
+Put, at the end of the file:
 <code>
 #include "Element_Creg.h"
 </code>
-This lets the driver know that there is a Creg element to use.
+This elemental include file is used by all drivers so they know about the elements to use.
-Next, open:
+===== Register Element with a Driver =====
+Open:
 <code>