整理一些非常有用的gems

1. will_paginate
   URL:
   Fuction: 
   Install:
   Use:
   代码如下：
   
   
   
2. open_flash_chart
   URL: https://github.com/pullmonkey/open_flash_chart
   DEMO:http://pullmonkey.com/projects/open_flash_chart2/
   Fuction: 能非常的开发出各种漂亮，强大的图表
   code:
   

   class TestItController < ApplicationController
     
     #柱状图
     def index
       actionname = params[:actionname] || "index"
       Rails.logger.info("actionname is #{actionname}")
       respond_to do |wants|
         wants.html {
           @graph = open_flash_chart_object( 600, 300, url_for( :action => actionname, :format => :json ) )
         }
         wants.json { 
           chart = OpenFlashChart.new("我的柱状图") do |c|
             c << BarGlass.new( :values => (1..10).sort_by{rand} )
           end
           render :text => chart, :layout => false
         }
       end
     end
   
     #饼状图
     def bar
      respond_to do |format|
        format.json{
          title = Title.new("Pie Chart Example For Chipster")
          pie = Pie.new
          pie.start_angle = 35
          pie.animate = true
          pie.tooltip = '#val# of #total#<br>#percent# of 100%'
          pie.colours = ["#d01f3c", "#356aa0", "#C79810"]
          pie.values  = [2,3, PieValue.new(6.5,"Hello (6.5)")]
   
          chart = OpenFlashChart.new
          chart.title = title
          chart.add_element(pie)
   
          chart.x_axis = nil
   
          render :text => chart.to_s
        }
      end
     end
   
     #line
      def line
       title = Title.new("Multiple Lines")
   
       data1 = []
       data2 = []
       data3 = []
   
       10.times do |x|
         data1 << rand(5) + 1
         data2 << rand(6) + 7
         data3 << rand(5) + 14
       end
   
       line_dot = LineDot.new
       line_dot.text = "Line Dot"
       line_dot.width = 4
       line_dot.colour = '#DFC329'
       line_dot.dot_size = 5
       line_dot.values = data1
       Rails.logger.info("line_hollow data is : #{line_dot.inspect}")
       line_hollow = LineHollow.new
       line_hollow.text = "Line Hollow"
       line_hollow.width = 1
       line_hollow.colour = '#6363AC'
       line_hollow.dot_size = 5
       line_hollow.values = data2
       Rails.logger.info("line_hollow data is : #{line_hollow.inspect}")
       line = Line.new
       line.text = "Line"
       line.width = 1
       line.colour = '#5E4725'
       line.dot_size = 5
       line.values = data3
       Rails.logger.info("line data is : #{line.inspect}")
       
       y = YAxis.new
       y.set_range(0,20,5)
   
       x_legend = XLegend.new("MY X Legend")
       x_legend.set_style('{font-size: 20px; color: #778877}')
   
       y_legend = YLegend.new("MY Y Legend")
       y_legend.set_style('{font-size: 20px; color: #770077}')
   
       chart =OpenFlashChart.new
       chart.set_title(title)
       chart.set_x_legend(x_legend)
       chart.set_y_legend(y_legend)
       chart.y_axis = y
   
       chart.add_element(line_dot)
       chart.add_element(line_hollow)
       chart.add_element(line)
       respond_to do |format|
         format.json {
           render :text => chart.to_s
         }
       end
     end
   
     #波动图
     def chart
       data1 = []
       data2 = []
       year = Time.now.year
   
       31.times do |i|
         x = "#{year}-1-#{i+1}".to_time.to_i
         y = (Math.sin(i+1) * 2.5) + 10
   
         data1 << ScatterValue.new(x,y)
         data2 << (Math.cos(i+1) * 1.9) + 4
       end
   
       dot = HollowDot.new
       dot.size = 3
       dot.halo_size = 2
       dot.tooltip = "#date:d M y#<br>Value: #val#"
   
       line = ScatterLine.new("#DB1750", 3)
       line.values = data1
       line.default_dot_style = dot
   
       x = XAxis.new
       x.set_range("#{year}-1-1".to_time.to_i, "#{year}-1-31".to_time.to_i)
       x.steps = 86400
   
       labels = XAxisLabels.new
       labels.text = "#date: Y-M-d#"
       labels.steps = 86400
       labels.visible_steps = 2
       labels.rotate = 90
   
       x.labels = labels
   
       y = YAxis.new
       y.set_range(0,15,5)
   
       chart = OpenFlashChart.new
       title = Title.new(data2.size)
   
       chart.title = title
       chart.add_element(line)
       chart.x_axis = x
       chart.y_axis = y
   
       respond_to do |format|
         format.json {
           render :text => chart.to_s
         }
       end
     end
   
   end
   

   line图还有一些问题,需要研究一下
   访问方法
   http://192.168.1.21/test_it?actionname=%22bar%22
   
   
3. cache_money
   URL:https://github.com/nkallen/cache-money
   
4. auto_complete
   URL:https://github.com/edendevelopment/auto_complete
   
5. 二维码生车插件
   http://code.google.com/p/qrcode-rails/