[XP Script] Moving Windows - Printable Version

Code:
class Numeric

  def sign

    return 0 if self.zero?

    return (self / self.abs).to_i

  end

end



class Window_Base

  #--------------------------------------------------------------------------

  # * Move the sprite

  #   x     : x coordinate of the destination point

  #   y     : y coordinate of the destination point

  #   speed : Speed of movement

  #--------------------------------------------------------------------------

  def move(x, y, speed = 1)

    # Set Destination Points speed and move count set moving flag

    @destination_x = x

    @destination_y = y

    @move_speed = speed

    @moving = true

    # Get the distance + (negative if to left or up positive if down or right)

    @distance_x = (@destination_x - self.x).to_f

    @distance_y = (@destination_y - self.y).to_f

    # Get slant distance (hypotenuse of the triangle (xf,yi) (xi,yf) and (xf,yf))

    @distance = Math.sqrt(@distance_x ** 2 + @distance_y ** 2)

    # Calculate angle of movement which is later used to determine direction

    # If X distance is 0 (Prevent Infinity Error)

    if @distance_x == 0

      # The Angle is sign(distance_y) * - ? / 2 (90ÃÂ° or 270ÃÂ°)

      @angle = @distance_y.sign * Math::PI / 2

    # If Y distance is 0 (Prevent Incorrect Direction for later)

    elsif @distance_y == 0

      # The Angle is sign(distance_x) - 1 * ? / 2 (0ÃÂ° or 180ÃÂ°)

      @angle = (@distance_x.sign - 1) * Math::PI / 2

    else

      # The Angle is the Arctangent of @distance_y / @distance_x (slope)

      # Returns [-?,?]

      @angle = Math.atan2(@distance_y, @distance_x.to_f)

    end

    # Convert the angle to degrees

    @angle *= 180 / Math::PI

  end

  #--------------------------------------------------------------------------

  # * Update Move

  #--------------------------------------------------------------------------

  alias moving_window_update update

  def update

    moving_window_update

    update_move

  end

  #--------------------------------------------------------------------------

  # * Moving?

  #--------------------------------------------------------------------------

  def moving?

    return @moving

  end

  #--------------------------------------------------------------------------

  # * Update Move

  #--------------------------------------------------------------------------

  def update_move

    # If not moving

    if (self.x == @destination_x and self.y == @destination_y) or not @moving

      @moving = false

      return

    end

    # move increase x = the cosine of the arctangent of the dist x over dist y

    # move increase x = cos(arctan(disty/distx)) simplified by trigonometry

    # to distance_x / slant_distance, the sprite moves (move speed) 

    # along the slanted line (if it is slanted)

    movinc_x = @move_speed * @distance_x.abs / @distance

    # same reasoning with y increase except it is the sine of the arctangent

    # move increase y = sin(arctan(disty/distx)) simplified by trigonometry

    # to distance_y / slant_distance

    movinc_y = @move_speed * @distance_y.abs / @distance

    # Move the sign of the distance left + move increase or the remaining distance

    # left if it will go past that point

    if @move_speed != 0

      # Get distance remaining

      remain_x = (@destination_x - self.x).abs

      remain_y = (@destination_y - self.y).abs

      self.x += (@destination_x - self.x).sign * [movinc_x.ceil, remain_x].min

      self.y += (@destination_y - self.y).sign * [movinc_y.ceil, remain_y].min

    end

    # If Destination Reached stop moving

    if self.x == @destination_x and self.y == @destination_y

      @moving = false

      return

    end

  end

end