Refactoring2-7

オブジェクトに向けて

最後はオブジェクト．どう作っていくか． >|ruby| def sparkline(y_values)

 points = []
 y_values.each_index { |i| points << "#{i},#{200-y_values[i]}" }
 "<!-- sparkline -->
 #{SVG.polyline(points,"none","#333","1")}"

end

def spark(y_values)

 final_value = y_values[-1]
 centre_x=y_values.length-1
 centre_y=200-final_value
 "<!-- spark -->
 #{SVG.rect(centre_x-(SQUARE_SIDE/2),centre_y-(SQUARE_SIDE/2),
            SQUARE_SIDE,SQUARE_SIDE,'red','none',0)}
 <!-- final value -->
 #{SVG.text(centre_x+6, centre_y+4, final_value,"Verdana","9",SPARK_COLOR)}}"

end

def x_axis(y_values)

 "<!-- x-axis -->
 #{SVG.line(0,200,y_values.length,200,"#999","1")}"

end

tosses = values(10)

data = %Q{<svg xmlns="http://www.w3.org/2000/svg"

    xmlns:xlink="http://www.w3.org/1999/xlink" >
 #{x_axis(tosses)}
 #{sparkline(tosses)}
 #{spark(tosses)}

</svg>}