Class: Screen

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(transform, artist, basis, legend_box = LegendBox.new(artist), output = TextOutput.new) ⇒ Screen

Returns a new instance of Screen.



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# File 'lib/screen.rb', line 15

def initialize(transform, artist, basis, legend_box=LegendBox.new(artist), output=TextOutput.new)
	@legend_box = legend_box
	@transform = transform
	@artist = artist
	@basis = basis
	join = false
	@points = []
	@data = []
	@output = output
	@transform_matrix = Matrix.rows([[@transform.scale[:x], 0],[0, @transform.scale[:y]]])
	nhm = @transform_matrix* @basis.basis_matrix
	@affine_transform = PMatrix2D.new(nhm[0,0],nhm[0,1],@transform.origin[:x],nhm[1,0],nhm[1,1],@transform.origin[:y])
	@inverse_affine_transform = @affine_transform.get
	@inverse_affine_transform.invert
end

Instance Attribute Details

#points ⇒ Object

Returns the value of attribute points.



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# File 'lib/screen.rb', line 7

def points
  @points
end

Instance Method Details

#at(point, &block) ⇒ Object 



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# File 'lib/screen.rb', line 43

def at(point, &block)
	if (!point[:x] || !point[:y])
		@artist.reset_matrix
		block.call(point, self) if block
		return
	end
	p = transformed(point)
	if (block)
		@artist.reset_matrix
		block.call(point, p, self)
	end
end

#build ⇒ Object 



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# File 'lib/screen.rb', line 31

def build
	KnnBall.build(@data)
end

#draw_axes(x_interval, y_interval, options = {}) ⇒ Object 



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# File 'lib/screen.rb', line 128

def draw_axes(x_interval, y_interval, options = {})
	f = @artist.createFont("Georgia", 24, true);
	@artist.text_font(f,16)
	axis_screen_transform = Transform.new({:x => 800, :y => -800}, @transform.origin)
	origin = {:x => 0, :y => 0}
	screen_origin = @transform.apply(origin)
	x_basis_edge = axis_screen_transform.apply(@basis.x_basis_vector)
	y_basis_edge = axis_screen_transform.apply(@basis.y_basis_vector)

	x_ticks = @basis.x_ticks(x_interval)
	y_ticks = @basis.y_ticks(y_interval)

	x_ticks = x_ticks.collect {|t| {:from => @transform.apply(t[:from]), :to => @transform.apply(t[:to]), :label => t[:label]}}
	y_ticks = y_ticks.collect {|t| {:from => @transform.apply(t[:from]), :to => @transform.apply(t[:to]), :label => t[:label]}}

	@artist.line(x_ticks.first[:from][:x],x_ticks.first[:from][:y],x_ticks.last[:from][:x],x_ticks.last[:from][:y])
	@artist.line(y_ticks.first[:from][:x],y_ticks.first[:from][:y],y_ticks.last[:from][:x],y_ticks.last[:from][:y])

	x_axis_label_position = {:x => (x_ticks.first[:from][:x] + x_ticks.last[:from][:x])/2, :y => (x_ticks.first[:from][:y] + x_ticks.last[:from][:y])/2 + 50}
	y_axis_label_position = {:x => (y_ticks.first[:from][:x] + y_ticks.last[:from][:x])/2 - 60, :y => (y_ticks.first[:from][:y] + y_ticks.last[:from][:y])/2}
	
	@artist.push_matrix
	@artist.translate(x_axis_label_position[:x], x_axis_label_position[:y])
	@artist.rotate(2*Math::PI - Math.atan2(@basis.x_basis_vector[:y], @basis.x_basis_vector[:x]))
	@artist.text(@basis.x_basis_vector[:label], 0, 0)
	@artist.pop_matrix

	@artist.push_matrix
	@artist.translate(y_axis_label_position[:x], y_axis_label_position[:y])
	@artist.rotate(2*Math::PI - Math.atan2(@basis.y_basis_vector[:y], @basis.y_basis_vector[:x]))
	@artist.text(@basis.y_basis_vector[:label], 0, 0)
	@artist.pop_matrix
	
	draw_ticks(x_ticks, {:x => 0, :y => 20}, options[:x])
	draw_ticks(y_ticks, {:x => -50, :y => 0}, options[:y])
	
	@artist.stroke(0.4, 1.0, 0.5, 0.2)
	return if !options[:gridlines].nil? && options[:gridlines] == false
	grid_lines = @basis.grid_lines(x_interval, y_interval).collect {|gl| {:from => @transform.apply(gl[:from]), :to => @transform.apply(gl[:to])}}
	grid_lines.each do |l|
		@artist.line(l[:from][:x],l[:from][:y],l[:to][:x],l[:to][:y])
	end
end

#draw_crosshairs(p) ⇒ Object 



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# File 'lib/screen.rb', line 35

def draw_crosshairs(p)
	@basis.crosshairs(p).each do |hair|
		from = @transform.apply(hair[:from])
		to = @transform.apply(hair[:to])
		@artist.line(from[:x], from[:y], to[:x], to[:y])
	end
end

#in_basis(&blk) ⇒ Object 



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# File 'lib/screen.rb', line 89

def in_basis(&blk)
	@artist.apply_matrix(@affine_transform)
	blk.call
	@artist.reset_matrix
end

#join=(should_join) ⇒ Object 



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# File 'lib/screen.rb', line 10

def join=(should_join)
	@should_join = should_join
	@buffer = nil if !@should_join
end

#original(onscreen_point) ⇒ Object 



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# File 'lib/screen.rb', line 105

def original(onscreen_point)
	transformed_p = @inverse_affine_transform.mult([onscreen_point[:x], onscreen_point[:y]].to_java(:float), nil)
	{:x => transformed_p[0], :y => transformed_p[1]}
end

#outside_basis(&blk) ⇒ Object 



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# File 'lib/screen.rb', line 95

def outside_basis(&blk)
	@artist.reset_matrix
	blk.call
end

#plot(points, options = {:bar => false, :track => false, :legend => ''}, &block) ⇒ Object 



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# File 'lib/screen.rb', line 56

def plot(points, options = {:bar => false, :track => false, :legend => ''}, &block)
	if points.kind_of? Array
		points.each {|p| plot_single(p, options, &block)}
	else
		plot_single(points, options, &block)
	end
	return if options[:legend].nil?
	outside_basis do
		@legend_box.draw(options[:legend])
	end
end

#transformed(data_point) ⇒ Object 



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# File 'lib/screen.rb', line 100

def transformed(data_point)
	transformed_p = @affine_transform.mult([data_point[:x], data_point[:y]].to_java(:float), nil)
	{:x => transformed_p[0], :y => transformed_p[1]}
end

#write(p) ⇒ Object 



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# File 'lib/screen.rb', line 172

def write(p)
	@output.notify(p)
end