initial

1 files changed, 65 insertions, 0 deletions

diff --git a/camera.rb b/camera.rb
new file mode 100644
index 0000000..7e93f7e
--- /dev/null
+++ b/camera.rb
@@ -0,0 +1,65 @@
+
+class Camera
+  
+  def self.elasticity
+    @elasticity ||= 1
+  end
+
+  def self.elasticity= speed
+    @elasticity = speed
+  end
+
+  def self.follow item
+    self.move_to((item.x - (Window.width / 2))/self.elasticity,
+                 (item.y - (Window.height / 2))/self.elasticity)
+  end
+
+  def self.objects
+    @objects ||= []
+  end
+
+  def self.<< item
+    unless self.objects.include?(item)
+      self.objects.push(item)
+    end
+  end
+
+  def self.add item
+    self << item
+  end
+
+  def self.remove item
+    if self.objects.include?(item)
+      self.objects.delete(item)
+    end
+  end
+
+  
+  def self.move_by(x,y)
+    self.camera_position[0] += x
+    self.camera_position[1] += y
+    objects.each do |object|
+      object.x -= x
+      object.y -= y
+    end
+  end
+  def self.move_to(x,y)
+    self.camera_position = [x+camera_position[0],y+camera_position[1]]
+    objects.each do |object|
+      object.x -= x
+      object.y -= y
+    end
+  end
+  
+  def self.camera_position
+    @camera_position ||= [0,0]
+  end
+
+  private
+
+  def self.camera_position= array
+    @camera_position = array
+  end
+
+  
+end