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class Camera
def self.zoom_level
@zoom_level ||= 1
end
def self.zoom_by zoom
objects.each do |object|
object.size *= zoom
object.x *= zoom
object.y *= zoom
end
self.move_by(Window.width/2 * (zoom-1),Window.height/2 * (zoom-1))
self.zoom_level *= zoom
end
def self.zoom_to zoom
self.zoom_by(zoom/self.zoom_level)
end
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
def self.zoom_level= value
@zoom_level = value
end
end
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