From f25ab51cef533d27115f6aa6fc053ffd6d08bd49 Mon Sep 17 00:00:00 2001
From: FajsiEx <fajsiexofficial@gmail.com>
Date: Fri, 30 Jul 2021 21:34:36 +0200
Subject: [PATCH] + scrolling transition to song wheel

---
 scripts/common/easings.lua       |  2 +-
 scripts/songselect/songwheel.lua | 46 ++++++++++++++++++++++++++++----
 2 files changed, 42 insertions(+), 6 deletions(-)

diff --git a/scripts/common/easings.lua b/scripts/common/easings.lua
index 19fd2e7..a8bb608 100644
--- a/scripts/common/easings.lua
+++ b/scripts/common/easings.lua
@@ -23,7 +23,7 @@ local pow = function (a,b)
     return a ^ b;
 end
 
-local function inQuad(t, b, c, d)
+local function inQuad(t)
     t = t / 1
     return 1 * pow(t, 2) + 0
 end
diff --git a/scripts/songselect/songwheel.lua b/scripts/songselect/songwheel.lua
index b7e7acb..04abea0 100644
--- a/scripts/songselect/songwheel.lua
+++ b/scripts/songselect/songwheel.lua
@@ -1,4 +1,6 @@
 
+local Easing = require('common.easings');
+
 local backgroundImage = gfx.CreateSkinImage("song_select/bg.png", 1)
 local songPlateBg = gfx.CreateSkinImage("song_select/plate/bg.png", 1)
 local songPlateBottomBarOverlayImage = gfx.CreateSkinImage("song_select/plate/bottom_bar_overlay.png", 1)
@@ -33,11 +35,17 @@ local resx, resy = game.GetResolution()
 local desw, desh;
 local scale;
 
+local songPlateHeight = 172;
+
 local selectedIndex = 1;
 local selectedDifficulty = 1;
 
 local jacketCache = {}
 
+local transitionScrollScale = 0;
+local transitionScrollOffsetY = 0;
+local scrollingUp = false;
+
 function resetLayoutInformation()
     resx, resy = game.GetResolution()
     desw = 1080
@@ -142,22 +150,23 @@ function drawSong(song, y)
 end
 
 function drawSongList()
-    local numOfSongsAround = 4; -- How many songs should be up and how many should be down of the selected one
+    local numOfSongsAround = 7; -- How many songs should be up and how many should be down of the selected one
+
 
     local i=1;
     while (i <= numOfSongsAround) do
         local songIndex = getCorrectedIndex(selectedIndex, -i)
-        drawSong(songwheel.songs[songIndex], desh/2-172/2-172*i)
+        drawSong(songwheel.songs[songIndex], desh/2-songPlateHeight/2-songPlateHeight*i + transitionScrollOffsetY)
         i=i+1;
     end;
     
     -- Draw the selected song
-    drawSong(songwheel.songs[selectedIndex], desh/2-172/2)
+    drawSong(songwheel.songs[selectedIndex], desh/2-songPlateHeight/2 + transitionScrollOffsetY)
 
     i=1;
     while (i <= numOfSongsAround) do
         local songIndex = getCorrectedIndex(selectedIndex, i)
-        drawSong(songwheel.songs[songIndex], desh/2-172/2+172*i)
+        drawSong(songwheel.songs[songIndex], desh/2-songPlateHeight/2+songPlateHeight*i + transitionScrollOffsetY)
         i=i+1;
     end;
 end
@@ -167,8 +176,23 @@ function drawCursor()
     gfx.ImageRect(desw/2-14, desh/2-213/2, 555, 213, cursorImage, 1, 0)
 end
 
+function tickTransitions(deltaTime)
+    if transitionScrollScale < 1 then
+        transitionScrollScale = transitionScrollScale + deltaTime / 0.1 -- transition should last for that time in seconds
+    else
+        transitionScrollScale = 1
+    end
+
+    if scrollingUp then 
+        transitionScrollOffsetY = Easing.inQuad(1-transitionScrollScale) * songPlateHeight;
+    else
+        transitionScrollOffsetY = Easing.inQuad(1-transitionScrollScale) * -songPlateHeight;
+    end
+end
+
 render = function (deltaTime)
     resetLayoutInformation();
+    tickTransitions(deltaTime);
     gfx.Scale(scale, scale);
 
     if not difficultyNumbers then
@@ -180,13 +204,25 @@ render = function (deltaTime)
     drawSongList()
     drawCursor()
 
+
     gfx.BeginPath();
     gfx.FontSize(18)
     gfx.TextAlign(gfx.TEXT_ALIGN_LEFT + gfx.TEXT_ALIGN_TOP)
-    gfx.Text('DELTA: ' .. deltaTime .. ' // SELECTED_INDEX: ' .. selectedIndex .. ' // SELECTED_DIFF: ' .. selectedDifficulty .. ' // #JACKET_CACHE: ' .. #jacketCache, 8, 8);
+    local debugScrollingUp= "FALSE"
+    if scrollingUp then debugScrollingUp = "TRUE" end;
+    gfx.Text('DELTA: ' .. deltaTime .. ' // SELECTED_INDEX: ' .. selectedIndex .. ' // SELECTED_DIFF: ' .. selectedDifficulty .. ' // SCROLLING_UP: ' .. debugScrollingUp, 8, 8);
 end
 
 set_index = function(newIndex)
+    transitionScrollScale = 0;
+
+	scrollingUp = false;
+	if ((newIndex > selectedIndex and not (newIndex == #songwheel.songs and selectedIndex == 1)) or (newIndex == 1 and selectedIndex == #songwheel.songs)) then
+		scrollingUp = true;
+	end;
+
+    -- TODO: add sfx for cursor change
+
     selectedIndex = newIndex;
 end;