funfriend wanders around

src/ease.cr

@@ -0,0 +1,15 @@
+module Funfriend::Ease
+  extend self
+
+  include Math
+
+  def inSine(x)
+    1 - cos(x * (PI * 0.5))
+  end
+  def outSine(x)
+    sin(x * (PI * 0.5))
+  end
+  def inOutSine(x)
+    0.5 - 0.5 * cos(x * PI)
+  end
+end

src/funfriend.cr

@@ -4,6 +4,7 @@ require "crystgl"
 require "crystimage"
 
 require "./log.cr"
+require "./ease.cr"
 require "./gl.cr"
 require "./textureman.cr"
 require "./fontman.cr"

src/funfriend_context.cr

@@ -1,12 +1,4 @@
 class Funfriend::FunfriendContext < Funfriend::WindowContext
-  getter renderer : FunfriendRenderer
-  property chatter_timer : Float64
-  property chatter_index : Int32
-  property chatter_array : Array(String)?
-
-  property held : Bool
-  property held_at : NamedTuple(x: Int32, y: Int32)
-
   WINDOW_SIZE = {width: 82, height: 82}
   CHATTER_TIMER = 3.0
 
@@ -17,6 +9,26 @@ class Funfriend::FunfriendContext < Funfriend::WindowContext
     ["INTERLOPER!", "WELCOME", "BUT ALSO PLEASE DO NOT BOTHER ME", "VERY BUSY"]
   ]
 
+  getter renderer : FunfriendRenderer
+  property chatter_timer : Float64 = 1.0
+  property chatter_index : Int32 = 0
+  property chatter_array : Array(String)? = CHATTER_ARRAY.sample
+
+  property held : Bool = false
+  property held_at : NamedTuple(x: Int32, y: Int32) = {x: 0, y: 0}
+  STAY_STILL_AFTER_HELD = 1.0
+  property held_timer : Float64 = 0.0
+
+  property static_pos : NamedTuple(x: Int32, y: Int32)
+
+  property easing_from : NamedTuple(x: Int32, y: Int32) = {x: 0, y: 0}
+  property easing_to : NamedTuple(x: Int32, y: Int32) = {x: 0, y: 0}
+  property easing_dur : Float64 = 0.0
+  property easing_t : Float64 = 0.0
+
+  WANDER_TIMER = 4.0
+  property wander_timer : Float64 = WANDER_TIMER
+
   def initialize
     super(
       title: "??_FUNFRIEND_??",
@@ -24,13 +36,6 @@ class Funfriend::FunfriendContext < Funfriend::WindowContext
       transparent: true
     )
 
-    @chatter_timer = 1.0
-    @chatter_index = 0
-    @chatter_array = CHATTER_ARRAY.sample
-
-    @held = false
-    @held_at = {x: 0, y: 0}
-
     # just for initialization, let OpenGL know this is the current context
     window.make_context_current
     @renderer = FunfriendRenderer.new
@@ -41,11 +46,13 @@ class Funfriend::FunfriendContext < Funfriend::WindowContext
       end
       if event.mouse_button.one?
         if event.action.press?
+          @easing_dur = 0.0
           @held = true
           @held_at = {
             x: window.cursor.position[:x].to_i,
             y: window.cursor.position[:y].to_i,
           }
+          @held_timer = STAY_STILL_AFTER_HELD
           window.cursor Window::Cursor::Shape::Hand
         elsif event.action.release?
           @held = false
@@ -66,6 +73,7 @@ class Funfriend::FunfriendContext < Funfriend::WindowContext
       x: monitor.position[:x] + (monitor.video_mode.size[:width] * rand((0.0..1.0))).to_i,
       y: monitor.position[:y] + (monitor.video_mode.size[:height] * rand((0.0..1.0))).to_i
     }
+    @static_pos = window.position
   end
 
   def render(dt : Float64)
@@ -76,12 +84,49 @@ class Funfriend::FunfriendContext < Funfriend::WindowContext
     renderer.render(dt, WINDOW_SIZE[:width], WINDOW_SIZE[:height])
   end
 
+  def goto(pos : NamedTuple(x: Int32, y: Int32), dur : Float64)
+    @easing_t = 0.0
+    @easing_dur = dur
+    @easing_from = window.position
+    @easing_to = pos
+
+    LOG.info { "going from #{easing_from} to #{easing_to}" }
+  end
+
+  def update_wander(dt : Float64)
+    if @easing_dur != 0.0 && @easing_t <= @easing_dur
+      @easing_t = @easing_t + dt
+      a = Ease.inOutSine(@easing_t / @easing_dur)
+
+      window.position = {
+        x: (@easing_from[:x] * (1.0 - a) + @easing_to[:x] * a).to_i,
+        y: (@easing_from[:y] * (1.0 - a) + @easing_to[:y] * a).to_i,
+      }
+
+      @wander_timer = WANDER_TIMER
+    else
+      @wander_timer = @wander_timer - dt
+      if @wander_timer <= 0
+        goto({
+          x: @static_pos[:x] + (-40 .. 40).sample,
+          y: @static_pos[:y] + (-40 .. 40).sample,
+        }, 4.0)
+      end
+    end
+  end
+
   def update_pos(dt : Float64)
     if held
       window.position = {
         x: window.position[:x] - held_at[:x] + window.cursor.position[:x].to_i,
         y: window.position[:y] - held_at[:y] + window.cursor.position[:y].to_i,
       }
+      @static_pos = window.position
+    else
+      @held_timer = @held_timer - dt
+      if @held_timer <= 0
+        update_wander(dt)
+      end
     end
   end