Class: Camera

Inherits:
Object
  • Object
show all
Defined in:
lib/entities/camera.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#target ⇒ Object

Returns the value of attribute target.



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# File 'lib/entities/camera.rb', line 3

def target
  @target
end

#x ⇒ Object

Returns the value of attribute x.



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# File 'lib/entities/camera.rb', line 2

def x
  @x
end

#y ⇒ Object

Returns the value of attribute y.



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# File 'lib/entities/camera.rb', line 2

def y
  @y
end

#zoom ⇒ Object

Returns the value of attribute zoom.



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# File 'lib/entities/camera.rb', line 2

def zoom
  @zoom
end

Instance Method Details

#desired_spot ⇒ Object 



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# File 'lib/entities/camera.rb', line 11

def desired_spot
  if @target.physics.moving?
    Utils.point_at_distance(
      @target.x, @target.y,
      @target.direction,
      @target.physics.speed.ceil * 25)
  else
    [@target.x, @target.y]
  end
end

#draw_crosshair ⇒ Object 



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# File 'lib/entities/camera.rb', line 89

def draw_crosshair
  factor = 0.5
  x = $window.mouse_x
  y = $window.mouse_y
  c = crosshair
  c.draw(x - c.width * factor / 2,
         y - c.height * factor / 2,
         1000, factor, factor)
end

#mouse_coords ⇒ Object 



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# File 'lib/entities/camera.rb', line 22

def mouse_coords
  x, y = target_delta_on_screen
  mouse_x_on_map = @target.x +
    (x + $window.mouse_x - ($window.width / 2)) / @zoom
  mouse_y_on_map = @target.y +
    (y + $window.mouse_y - ($window.height / 2)) / @zoom
  [mouse_x_on_map, mouse_y_on_map].map(&:round)
end

#target_delta_on_screen ⇒ Object 



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# File 'lib/entities/camera.rb', line 85

def target_delta_on_screen
  [(@x - @target.x) * @zoom, (@y - @target.y) * @zoom]
end

#to_s ⇒ Object 



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# File 'lib/entities/camera.rb', line 79

def to_s
  "FPS: #{Gosu.fps}. " <<
    "#{@x}:#{@y} @ #{'%.2f' % @zoom}. " <<
    'WASD to move, arrows to zoom.'
end

#update ⇒ Object 



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# File 'lib/entities/camera.rb', line 31

def update
  des_x, des_y = desired_spot
  shift = Utils.adjust_speed(
    @target.physics.speed).floor *
    @target.speed_modifier + 1
  if @x < des_x
    if des_x - @x < shift
      @x = des_x
    else
      @x += shift
    end
  elsif @x > des_x
    if @x - des_x < shift
      @x = des_x
    else
      @x -= shift
    end
  end
  if @y < des_y
    if des_y - @y < shift
      @y = des_y
    else
      @y += shift
    end
  elsif @y > des_y
    if @y - des_y < shift
      @y = des_y
    else
      @y -= shift
    end
  end

  zoom_delta = @zoom > 0 ? 0.01 : 1.0
  zoom_delta = Utils.adjust_speed(zoom_delta)
  if $window.button_down?(Gosu::KbUp)
    @zoom -= zoom_delta unless @zoom < 0.7
  elsif $window.button_down?(Gosu::KbDown)
    @zoom += zoom_delta unless @zoom > 10
  else
    target_zoom = @target.physics.speed > 1.1 ? 0.75 : 1.0
    if @zoom <= (target_zoom - 0.01)
      @zoom += zoom_delta / 3
    elsif @zoom > (target_zoom + 0.01)
      @zoom -= zoom_delta / 3
    end
  end
end

#viewport ⇒ Object 



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# File 'lib/entities/camera.rb', line 99

def viewport
  x0 = @x - ($window.width / 2)  / @zoom
  x1 = @x + ($window.width / 2)  / @zoom
  y0 = @y - ($window.height / 2) / @zoom
  y1 = @y + ($window.height / 2) / @zoom
  [x0, x1, y0, y1]
end