[cairo-commit] rcairo/samples text2.rb,1.1,1.2

[Kouhei Sutou]

Committed by: kou

Update of /cvs/cairo/rcairo/samples
In directory kemper:/tmp/cvs-serv1550/samples

Modified Files:
	text2.rb 
Log Message:
* packages/cairo/ext/rb_cairo_context.c (cr_select_font_face):
  made slang and weight arguments of Cairo::Context#select_font_face
  optional.

* samples/text2.rb: added --fade-out option.


Index: text2.rb
===================================================================
RCS file: /cvs/cairo/rcairo/samples/text2.rb,v
retrieving revision 1.1
retrieving revision 1.2
diff -u -d -r1.1 -r1.2
--- text2.rb	1 Jun 2006 02:55:51 -0000	1.1
+++ text2.rb	20 Oct 2006 14:41:49 -0000	1.2
@@ -14,20 +14,17 @@
   options.width = 595.275590551181.round
   options.height = 841.889763779528.round
   options.font_description = "Monospace 12"
+  options.fade_out = false
 
   opts = OptionParser.new do |opts|
-    opts.on("--width=WIDTH", "paper width") do |width|
-      options.width = width.to_i
-    end
-
-    opts.on("--height=HEIGHT", "paper width") do |width|
-      options.width = width.to_i
-    end
-
+    opts.on("--width=WIDTH", Integer, "paper width") {|options.width|}
+    opts.on("--height=HEIGHT", Integer, "paper height") {|options.height|}
     opts.on("--font-description=DESCRIPTION",
             "font description (e.g. 'Monospace 14')") do |desc|
       options.font_description = desc
     end
+    opts.on("--[no-]fade-out",
+            "fade-out one-third of page") {|options.fade_out|}
   end
 
   opts.parse!(args)
@@ -35,43 +32,74 @@
   options
 end
 
-def render(text, width, height, font_description, output, surface_class)
-  margin_left = (width * 0.05).ceil
-  margin_right = (width * 0.05).ceil
-  margin_top = (height * 0.05).ceil
-  margin_bottom = (height * 0.05).ceil
-  body_width = width - margin_left - margin_right
-  body_height = height - margin_top - margin_bottom
-
-  surface = surface_class.new(output, width, height)
-  cr = Cairo::Context.new(surface)
-
+def render_background(cr)
   cr.set_source_rgba(1.0, 1.0, 1.0)
   cr.paint
+end
 
-  cr.set_source_rgba(0, 0, 0, 1)
+def make_layout(cr, text, width, font_description)
   layout = cr.create_pango_layout
   layout.text = text
-  layout.width = body_width * Pango::SCALE
+  layout.width = width * Pango::SCALE
   layout.font_description = Pango::FontDescription.new(font_description)
   cr.update_pango_layout(layout)
+  layout
+end
+
+def setup_fade_out(cr, width)
+  fade_out = Cairo::LinearPattern.new(0, 0, width, 0)
+  fade_out.add_color_stop_rgba(0, 0, 0, 0, 1)
+  fade_out.add_color_stop_rgba(0.66, 0, 0, 0, 1)
+  fade_out.add_color_stop_rgba(1, 0, 0, 0, 0)
+
+  cr.set_source(fade_out)
+end
+
+def render_layout(cr, layout, initial_x, initial_y, initial_rest_height)
+  x = initial_x
+  y = initial_y
+  rest_height = initial_rest_height
 
-  x = margin_left
-  y = margin_top
-  rest_height = body_height
   layout.lines.each do |line|
     ink_rect, logical_rect = line.pixel_extents
     line_height = logical_rect.height
     if rest_height < line_height
       cr.show_page
-      rest_height = body_height
-      y = margin_top
+      y = initial_y
+      rest_height = initial_rest_height
     end
     cr.move_to(x + logical_rect.x, y - logical_rect.y)
     cr.show_pango_layout_line(line)
-    rest_height -= line_height
     y += line_height
+    rest_height -= line_height
   end
+end
+
+def render(options, output, surface_class)
+  text = options.text
+  width = options.width
+  height = options.height
+  font_description = options.font_description
+  fade_out = options.fade_out
+
+  margin_left = (width * 0.05).ceil
+  margin_right = (width * 0.05).ceil
+  margin_top = (height * 0.05).ceil
+  margin_bottom = (height * 0.05).ceil
+  body_width = width - margin_left - margin_right
+  body_height = height - margin_top - margin_bottom
+
+  surface = surface_class.new(output, width, height)
+  cr = Cairo::Context.new(surface)
+
+  render_background(cr)
+  layout = make_layout(cr, text, body_width, font_description)
+  if fade_out
+    setup_fade_out(cr, body_width)
+  else
+    cr.set_source_rgba(0, 0, 0, 1)
+  end
+  render_layout(cr, layout, margin_left, margin_top, body_height)
 
   cr.show_page
 
@@ -79,21 +107,17 @@
   cr
 end
 
-def output(text, width, height, font_description, surface_class_name, suffix)
+def output(options, surface_class_name, suffix)
   if Cairo.const_defined?(surface_class_name)
     surface_class = Cairo.const_get(surface_class_name)
-    render(text, width, height, font_description,
-           "text2.#{suffix}", surface_class)
+    render(options, "text2.#{suffix}", surface_class)
   else
     puts("#{surface_class_name} isn't supported.")
   end
 end
 
 options = parse
-width = options.width
-height = options.height
-font_description = options.font_description
-text = ARGF.read
-output(text, width, height, font_description, "PSSurface", "ps")
-output(text, width, height, font_description, "PDFSurface", "pdf")
-output(text, width, height, font_description, "SVGSurface", "svg")
+options.text = ARGF.read
+output(options, "PSSurface", "ps")
+output(options, "PDFSurface", "pdf")
+output(options, "SVGSurface", "svg")