From bb9d6f403849e88776c06c339e999aecfa0539b3 Mon Sep 17 00:00:00 2001
From: Sergey Solovyev <se.solovyev@gmail.com>
Date: Sun, 13 Jan 2013 21:38:49 +0400
Subject: [PATCH] new plotter

---
 .../plot/CalculatorPlotterImpl.java           | 39 +++++++++++++++++--
 1 file changed, 36 insertions(+), 3 deletions(-)

diff --git a/core/src/main/java/org/solovyev/android/calculator/plot/CalculatorPlotterImpl.java b/core/src/main/java/org/solovyev/android/calculator/plot/CalculatorPlotterImpl.java
index 74bba028..19478641 100644
--- a/core/src/main/java/org/solovyev/android/calculator/plot/CalculatorPlotterImpl.java
+++ b/core/src/main/java/org/solovyev/android/calculator/plot/CalculatorPlotterImpl.java
@@ -71,9 +71,12 @@ public class CalculatorPlotterImpl implements CalculatorPlotter {
             yVariable = null;
         }
 
-        boolean realAdded = addFunction(new XyFunction(expression, xVariable, yVariable, false));
-
+        final PlotFunction realPlotFunction = newPlotFunction(new XyFunction(expression, xVariable, yVariable, false));
         final PlotFunction imagPlotFunction = newPlotFunction(new XyFunction(expression, xVariable, yVariable, true));
+
+        removeAllUnpinnedExcept(realPlotFunction, imagPlotFunction);
+
+        final boolean realAdded = addFunction(realPlotFunction);
         final boolean imagAdded = addFunction(plotImag ? imagPlotFunction : PlotFunction.invisible(imagPlotFunction));
 
         return imagAdded || realAdded;
@@ -97,6 +100,37 @@ public class CalculatorPlotterImpl implements CalculatorPlotter {
         }
     }
 
+
+    private boolean removeAllUnpinnedExcept(@NotNull final PlotFunction... exceptFunctions) {
+        synchronized (functions) {
+
+            boolean changed = Iterables.removeIf(functions, new Predicate<PlotFunction>() {
+                @Override
+                public boolean apply(@Nullable PlotFunction function) {
+                    if ( function != null && !function.isPinned() ) {
+
+                        for (PlotFunction exceptFunction : exceptFunctions) {
+                            if ( exceptFunction.equals(function) ) {
+                                return false;
+                            }
+                        }
+
+                        return true;
+                    } else {
+                        return false;
+                    }
+                }
+            });
+
+            if (changed) {
+                onFunctionsChanged();
+            }
+
+            return changed;
+        }
+    }
+
+
     @Override
     public void removeAllUnpinned() {
         synchronized (functions) {
@@ -267,7 +301,6 @@ public class CalculatorPlotterImpl implements CalculatorPlotter {
 
     @Override
     public void plot(@NotNull Generic expression) {
-        removeAllUnpinned();
         addFunction(expression);
         plot();
     }