Class: Budgie::Application

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Includes:
GL, GLU, GLUT
Defined in:
lib/budgie/application.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(filename, width = 800, height = 600) ⇒ Application

Returns a new instance of Application.



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# File 'lib/budgie/application.rb', line 25

def initialize(filename, width = 800, height = 600)
  usage unless filename

  @filename = filename

  glutInit
  glutInitDisplayMode GLUT_RGB | GLUT_DOUBLE | GLUT_ALPHA | GLUT_DEPTH
  glutInitWindowSize width, height
  glutInitWindowPosition width / 2, height / 2

  @window = glutCreateWindow "ffxel"

  glutIdleFunc :idle
  glutMouseFunc :click
  glutDisplayFunc :display
  glutReshapeFunc :reshape
  glutKeyboardFunc :press
  glutKeyboardUpFunc :release
  glutPassiveMotionFunc :mouse

  glutSetKeyRepeat GLUT_KEY_REPEAT_OFF

  reshape width, height

  setup

  glutMainLoop
end

Instance Attribute Details

#camera ⇒ Object (readonly)

Returns the value of attribute camera.



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# File 'lib/budgie/application.rb', line 21

def camera
  @camera
end

#height ⇒ Object (readonly)

Returns the value of attribute height.



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# File 'lib/budgie/application.rb', line 21

def height
  @height
end

#map ⇒ Object (readonly)

Returns the value of attribute map.



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# File 'lib/budgie/application.rb', line 21

def map
  @map
end

#palette ⇒ Object (readonly)

Returns the value of attribute palette.



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# File 'lib/budgie/application.rb', line 21

def palette
  @palette
end

#selection ⇒ Object (readonly)

Returns the value of attribute selection.



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# File 'lib/budgie/application.rb', line 21

def selection
  @selection
end

#width ⇒ Object (readonly)

Returns the value of attribute width.



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# File 'lib/budgie/application.rb', line 21

def width
  @width
end

Instance Method Details

#centered_mouse_mode ⇒ Object

hides cursor image centers cursor rotates camera



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# File 'lib/budgie/application.rb', line 210

def centered_mouse_mode
  glutSetCursor GLUT_CURSOR_NONE

  center_x = @width / 2
  center_y = @height / 2

  dx = center_x - @mouse_x
  dy = center_y - @mouse_y

  return if dx == 0 && dy == 0

  glutWarpPointer center_x, center_y

  quarter_x = center_x / 2
  quarter_y = center_y / 2

  return if dx.abs > quarter_x || dy.abs > quarter_y

  dx = 50.0 * dx / @width
  dy = 50.0 * dy / @height

  @camera.alpha += dx
  @camera.beta  += dy
end

#click(button, state, x, y) ⇒ Object

Event: mouse click



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# File 'lib/budgie/application.rb', line 131

def click(button, state, x, y)
  return unless state == GLUT_UP

  update_selection_at x, y

  if button == GLUT_LEFT_BUTTON && glutGetModifiers == GLUT_ACTIVE_SHIFT
    @scene.replace
  elsif button == GLUT_LEFT_BUTTON && glutGetModifiers == GLUT_ACTIVE_CTRL
    @scene.remove
  elsif button == GLUT_LEFT_BUTTON
    @scene.place
  elsif button == GLUT_RIGHT_BUTTON
    update_selection_color_at x, y
  end
end

#color_at(x, y) {|r, g, b| ... } ⇒ Object

yields pixel color at (x, y) in window coordinates

Yields:

  • (r, g, b) 


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# File 'lib/budgie/application.rb', line 155

def color_at(x, y, &block)
  y = @height - y
  rgb = glReadPixels x, y, 1, 1, GL_RGB, GL_UNSIGNED_BYTE
  r, g, b = rgb.unpack 'C*'
  yield r, g, b
end

#display ⇒ Object

Event: redraw



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# File 'lib/budgie/application.rb', line 84

def display
  @scene.display
  glutSwapBuffers
end

#escape ⇒ Object

User action: exit application



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# File 'lib/budgie/application.rb', line 148

def escape
  @store_map.save @map
  glutDestroyWindow @window
  exit 0
end

#free_mouse_mode ⇒ Object

draws default cursor



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# File 'lib/budgie/application.rb', line 203

def free_mouse_mode
  glutSetCursor GLUT_CURSOR_INHERIT
end

#idle ⇒ Object

Event: no events



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# File 'lib/budgie/application.rb', line 90

def idle
  time = Time.now.to_f
  @time = time unless @time
  delta = time - @time
  @time = time

  update_window_title(delta)
  update_camera_step(delta)

  send_key_presses
  update_selection_at @mouse_x, @mouse_y

  glutPostRedisplay
end

#message ⇒ Object 



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# File 'lib/budgie/application.rb', line 259

def message
  %{
    Usage
    -----

    $ budgie model-file.png


    Keyboard controls
    -----------------

     WASD  horizontal movement
    space  move up
        C  move down
        E  toggle palette
        F  free mouse mode


    Mouse controls
    --------------

              Left Click  place a block
             Right Click  colorpicker
      Shift + Left Click  replace current block color
    Control + Left Click  remove block

  }
end

#mouse(x, y) ⇒ Object

Event: mouse move



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# File 'lib/budgie/application.rb', line 123

def mouse(x, y)
  @mouse_x = x
  @mouse_y = y

  send mouse_mode
end

#mouse_mode ⇒ Object 



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# File 'lib/budgie/application.rb', line 251

def mouse_mode
  if @keyboard[@settings.free_mouse_mode_key]
    'free_mouse_mode'
  else
    'centered_mouse_mode'
  end
end

#press(key, x, y) ⇒ Object

Event: key press



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# File 'lib/budgie/application.rb', line 106

def press(key, x, y)
  @keyboard[key.downcase] = true
end

#release(key, x, y) ⇒ Object

Event: key release



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# File 'lib/budgie/application.rb', line 111

def release(key, x, y)
  @keyboard[key.downcase] = false
  if key == @settings.palette_key
    if @scene.fixed?
      @scene.release
    else
      @scene.fix
    end
  end
end

#reshape(width, height) ⇒ Object

Event: window size change



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# File 'lib/budgie/application.rb', line 70

def reshape(width, height)
  @width = width
  @height = height

  height = 1 if height == 0

  glViewport 0, 0, width, height

  glMatrixMode GL_PROJECTION
  glLoadIdentity
  gluPerspective 90.0, width.to_f / height.to_f, 0.001, 100.0
end

#send_key_presses ⇒ Object 



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# File 'lib/budgie/application.rb', line 195

def send_key_presses
  @keyboard.each do |key, pressed|
    key = @settings.keymap[key]
    send key if key && pressed
  end
end

#setup ⇒ Object 



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# File 'lib/budgie/application.rb', line 54

def setup
  @settings = Settings.new
  @keyboard = {}
  @mouse_x = @mouse_y = 0

  @camera = Camera.new
  @palette = Palette.new
  @selection = Selection.new

  @store_map = StoreMap.new @filename, @palette
  @map = @store_map.load

  @scene = Scene.new self
end

#update_camera_step(delta) ⇒ Object

smooth camera movement



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# File 'lib/budgie/application.rb', line 191

def update_camera_step(delta)
  @camera.step = 30 * delta
end

#update_selection_at(x, y) ⇒ Object

saves (x, y, z) coordinates of the block under cursor



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# File 'lib/budgie/application.rb', line 163

def update_selection_at(x, y)
  @scene.picker
  color_at x, y do |r, g, b|
    @selection.from_color r, g, b
  end
  update_selection_normal_at x, y
end

#update_selection_color_at(x, y) ⇒ Object

saves (r, g, b) color of the pixel under cursor



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# File 'lib/budgie/application.rb', line 181

def update_selection_color_at(x, y)
  @scene.color_picker
  color_at x, y do |r, g, b|
    @selection.r = r
    @selection.g = g
    @selection.b = b
  end
end

#update_selection_normal_at(x, y) ⇒ Object

saves (x, y, z) normal of the block’s face under cursor



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# File 'lib/budgie/application.rb', line 172

def update_selection_normal_at(x, y)
  return unless @selection.selected
  @scene.normal_picker
  color_at x, y do |r, g, b|
    @selection.normal_from_color r, g, b
  end
end

#update_window_title(delta) ⇒ Object 



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# File 'lib/budgie/application.rb', line 235

def update_window_title(delta)
  @delta = 0 unless @delta
  @frames = 0 unless @frames

  @delta += delta
  @frames += 1

  if @delta > 1
    s = @selection
    glutSetWindowTitle "@map.max: #{@map.max}; fps: #{@frames}; selection: #{s.new_x}, #{s.new_y}, #{s.new_z}"

    @delta = 0
    @frames = 0
  end
end

#usage ⇒ Object 



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# File 'lib/budgie/application.rb', line 288

def usage
  puts message.gsub /^ {4}/, ''
  exit 0
end