Use easing within the carousel view sliding

projects/mtg/src/CarouselDeckView.cpp

@@ -1,9 +1,9 @@
 #include "CarouselDeckView.h"
 
-const float CarouselDeckView::scroll_speed = 5.0f;
+const float CarouselDeckView::slide_animation_duration = 0.6f;
 
 CarouselDeckView::CarouselDeckView() :
-    DeckView(10), mScrollOffset(0), mSlide(0),  mScrollTarget(2), mStage(NONE)
+    DeckView(10), mScrollOffset(0), mSlide(0),  mScrollTarget(2)
 {
 }
 
@@ -35,39 +35,30 @@ void CarouselDeckView::UpdateViewState(float dt)
         dirtyCardPos = true;
     }
 
-    switch(mStage)
+    if(!mSlide.finished())
     {
-    case SLIDE_DOWN:
-        mSlide -= 0.05f;
-        if (mSlide < -1.0f)
+        mSlide.update(dt);
+
+        if(mSlide.value < mSlide.start_value)
         {
-            dirtyFilters = true;
-            mSlide = 1;
+            //going downwards
+            if(mSlide.value < -1.0f)
+            {
+                mSlide.translate(2.0f);
+                SwitchFilter(1);
+            }
         }
-        else if (mSlide > 0 && mSlide < 0.05)
+        else if(mSlide.value > mSlide.start_value)
         {
-            mStage = NONE;
-            mSlide = 0;
+            //upwards
+            if(mSlide.value > 1.0f)
+            {
+                mSlide.translate(-2.0f);
+                SwitchFilter(-1);
+            }
         }
+
         dirtyCardPos = true;
-        break;
-    case SLIDE_UP:
-        mSlide += 0.05f;
-        if (mSlide > 1.0f)
-        {
-            dirtyFilters = true;
-            mSlide = -1;
-        }
-        else if (mSlide < 0 && mSlide > -0.05)
-        {
-            mStage = NONE;
-            mSlide = 0;
-        }
-        dirtyCardPos = true;
-        break;
-    default:
-        mStage = NONE;
-        break;
     }
 }
 
@@ -78,7 +69,7 @@ void CarouselDeckView::UpdateCardPosition(CardRep &rep, int index)
     rep.x = x_center + cos((rotation) * M_PI / 12) * (right_border - x_center);
     rep.scale = max_scale / 1.12f * cos((rep.x - x_center) * 1.5f / (right_border - x_center)) + 0.2f * max_scale * cos(
                 cos((rep.x - x_center) * 0.15f / (right_border - x_center)));
-    rep.y = (SCREEN_HEIGHT_F) / 2.0f + SCREEN_HEIGHT_F * mSlide * (rep.scale + 0.2f);
+    rep.y = (SCREEN_HEIGHT_F) / 2.0f + SCREEN_HEIGHT_F * mSlide.value * (rep.scale + 0.2f);
 }
 
 void CarouselDeckView::Reset()
@@ -86,7 +77,6 @@ void CarouselDeckView::Reset()
     mScrollOffset = 0;
     mSlide = 0;
     mScrollTarget = 2;
-    mStage = NONE;
     DeckView::Reset();
 }
 
@@ -136,16 +126,17 @@ MTGCard * CarouselDeckView::Click(int x, int y)
     last_user_activity = 0;
 
     //clicked active card, and no animation is running
-    if(n == 2 && mStage == NONE)
+    if(mSlide.finished() && mScrollOffset.finished())
     {
-        return getActiveCard();
-    }
-
-    //clicked not the active card, start animation:s
-    if(n != 2 && mStage == NONE)
-    {
-        DebugTrace(">>>>> " << n);
-        changePosition(n - 2);
+        if(n == 2)
+        {
+            return getActiveCard();
+        }
+        else
+        {
+            DebugTrace(">>>>> " << n);
+            changePosition(n - 2);
+        }
     }
 
     return NULL;
@@ -161,17 +152,14 @@ void CarouselDeckView::changePosition(int offset)
 
 void CarouselDeckView::changeFilter(int offset)
 {
-    if(offset > 0)
+    if(offset < 0)
     {
-        mStage = SLIDE_UP;
-        SwitchFilter(1);
+        mSlide.start(-2.0f, slide_animation_duration);
     }
-    else if(offset < 0)
+    else if(offset > 0)
     {
-        mStage = SLIDE_DOWN;
-        SwitchFilter(-1);
+        mSlide.start(2.0f, slide_animation_duration);
     }
-
     last_user_activity = 0;
 }