Class: RAGE::InputHandlers::SimpleCameraInputHandler

Inherits:
Object
  • Object
show all
Defined in:
lib/rage/input.rb

Overview

Input handler providing the following simple controls

  • Mouse wheel in/out - zoom camera in/out

  • Hold left mouse button & drag, rotate camera

  • Hold right mouse button & drag, pan camera

Class Method Summary collapse

Class Method Details

.handle(event) ⇒ Object 



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# File 'lib/rage/input.rb', line 77

def self.handle(event)
   @@left_button_pressed  = false unless defined? @@left_button_pressed
   @@right_button_pressed = false unless defined? @@right_button_pressed

   case event
   when SDL::Event::MouseMotion
      # get state of mouse buttons
      left_pressed  = ((event.state & SDL::Mouse::BUTTON_LMASK) != 0)
      right_pressed = ((event.state & SDL::Mouse::BUTTON_RMASK) != 0)

      # if left button is down, rotate camera
      if left_pressed
        xpos, ypos, zpos    = RAGE::to_3d_coordinates(event.x, event.y)
        oxpos, oypos, ozpos = RAGE::to_3d_coordinates(event.x-event.xrel, event.y-event.yrel)

        if xpos > oxpos
           Game.current_viewport.camera.xrotate += 1
        elsif xpos < oxpos
           Game.current_viewport.camera.xrotate -= 1
        end

        if ypos > oypos
           Game.current_viewport.camera.yrotate += 1
        elsif ypos < oypos
           Game.current_viewport.camera.yrotate -= 1
        end

        if zpos > ozpos
           Game.current_viewport.camera.zrotate += 1
        elsif zpos < ozpos
           Game.current_viewport.camera.zrotate -= 1
        end

      # if right is down pan camera
      elsif right_pressed
        if event.xrel > 0
           Game.current_viewport.camera.pos[0]    -= 1
        elsif event.xrel < 0
           Game.current_viewport.camera.pos[0]    += 1
        end

        if event.yrel > 0
           Game.current_viewport.camera.pos[1]    += 1
        elsif event.yrel < 0
           Game.current_viewport.camera.pos[1]    -= 1
        end

      end

   when SDL::Event::MouseButtonDown
      # zoom out the camera
      if event.button == 5 # wheeldown
        Game.current_viewport.camera.pos[2]    += 1
      end

   when SDL::Event::MouseButtonUp
      # zoom in the camera
      if event.button == 4 # wheel up
        Game.current_viewport.camera.pos[2]    -= 1
      end

   end
end