# Filename: IndivStaff.rb# # This is a class representing a single staff# with specific numbers of leger lines above# and below the staff.require 'rubygems'require 'RMagick'class IndivStaff < Magick::ImageList def initialize # thickness in pixels of the staff lines draws @lineThickness = 2 # how far apart a staff line is from the next (incl leger lines) @lineSpacing = 15 # how many leger lines above the staff @upperLegers = 0 # how many leger lines below the staff @lowerLegers = 0 # how much extra space (in pixels) to allow above the staff and upper legers @extraTopSpace = 0 # how much space to allow below the staff and lower legers @extraBottomSpace = 0 # how wide the staff is (not including insets) @staffWidth = 300 # how much space in pixels to allow on the left and right sides of the staff @horizontalInset = 30 # @staffX and @staffY are upperleft corner of staff wrt the pane drawn in @staffX = @horizontalInset @staffY = @extraTopSpace \ + ((@upperLegers + 1) * @lineSpacing) # @paneW and @paneH are width and height of the pane to draw the staff in @paneW = @staffWidth + @horizontalInset * 2 @paneH = @extraTopSpace \ + (@upperLegers + 1) * @lineSpacing \ + 5 * @lineSpacing \ + @lowerLegers * @lineSpacing \ + @extraBottomSpace super self.new_image(@paneW, @paneH) # @staff is the drawing environemnt for the staff @staff = Magick::Draw.new @staff.stroke_width(@lineThickness) @staff.stroke('black') @staff.fill_opacity(0) @staff.stroke_opacity(1) end def display 5.times \ { | i | \ @staff.line( @staffX, @staffY + @lineSpacing * i, @staffX + @staffWidth, @staffY + @lineSpacing * i ) } @staff.draw(self) super end def showVars puts "@staffX = #{@staffX}" puts "@staffY = #{@staffY}" puts "@staffWidth = #{@staffWidth}" puts "@lineSpacing = #{@lineSpacing}" puts "@upperLegers = #{@lowerLegers}" puts "@lowerLegers = #{@lowerLegers}" puts "@extraTopSpace = #{@extraTopSpace}" puts "@extraBottomSpace = #{@extraBottomSpace}" puts "@horizontalInset = #{@horizontalInset}" puts "@lineThickness = #{@lineThickness}" puts "@paneW = #{@paneW}" puts "@paneH = #{@paneH}" endend