added Star element and example.

Johnathon E. Wright committed Nov 11, 2011

commit 12b0c771a0108f8227f32fb14a19711f842deed8

Showing 3 changed files with 50 additions and 9 deletions

examples/star.rb +7 -0

@@	@@ -0,0 +1,7 @@
+	class Star < Sketch
+
+	def draw(canvas)
+	Sketch::Star.new(:radius => self.width.to_f / 2.1, :x => self.width.to_f / 2, :y => self.width.to_f / 2, :fill => 'yellow', :stroke => 'black', :stroke_width => 1, :orientation => 45).draw(canvas)
+	end
+	end
+

sketch.rb b/lib/sketch.rb +1 -0

@@	@@ -48,4 +48,5 @@ require 'sketch/ellipse'
	require 'sketch/rect'
	require 'sketch/rectangle'
	require 'sketch/path'
+	require 'sketch/star'

sketch/star.rb b/lib/sketch/star.rb +42 -9

@@	@@ -5,17 +5,50 @@ class Sketch::Star < Sketch::Element
	has_value :radius
	has_value :orientation, :default => 0

+	has_value :number_of_points, :default => 5
+
+	has_value :fill
+	has_value :stroke
+	has_value :stroke_width
+
	central_point :x, :y

+	def degrees_to_radians( degrees )
+	degrees * Math::PI / 180
+	end
+
+	def angle_between_points
+	360 / number_of_points
+	end
+
+	def drawing_order_indexes
+	self.number_of_points.times.map do \|n\|
+	(n*2) % self.number_of_points
+	end
+	end
+
+	def points_in_drawing_order
+	drawing_order_indexes.map do \|index\|
+	points[index]
+	end
+	end
+
+	def points
+	@points \|\|= list = number_of_points.times.map do \|point_number\|
+	current_angle = orientation + ( angle_between_points * point_number )
+	[ x + (radius * Math.sin( degrees_to_radians( current_angle ))), y - (radius * Math.cos( degrees_to_radians( current_angle ))) ]
+	end
+	end
+
	def draw(canvas)
-	top = [x, y - radius]
-	mid_right = [x + radius, y-(.3*radius)]
-	lower_right = [x + (0.6 * radius), y + radius]
-	lower_left = [x - (0.6 * radius), y + radius]
-	mid_left = [x - radius, y-(0.3*radius)]
-	points = [ top, lower_right, mid_left, mid_right, lower_left, top ]
-	points.each{\|point\| point.join(',')}
-	points = points.join(' ')
-	canvas.polygon( :points => points)
+	if x && y && radius
+	atts = {}
+	atts['points'] = points_in_drawing_order.each{\|point\| point.join(',')}.join(' ')
+	atts['fill'] = attributes[:fill] if attributes.has_key?(:fill)
+	atts['stroke'] = attributes[:stroke] if attributes.has_key?(:stroke)
+	atts['stroke-width'] = attributes[:stroke_width] if attributes.has_key?(:stroke_width)
+
+	canvas.polygon( atts )
+	end
	end
	end