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Posts : 318
Join date : 2012-03-04
 |  Subject: Gruff graphs problem Fri Jul 27, 2012 10:55 pm | |
| This was a previous class assignment, and I decided I wanted to make the graph look slightly better so I decided to place a min/max value and set the increment for the graph up as well. Here is the function that creates the graph: - Code:
-
def update_graph
$g = Gruff::Line.new(600)
$g.title = "Name Popularity In Census Years"
#add data to graph
$list.each do
|name|
$g.data(name.upcase,$hash[name.upcase])
end
#labels for graph, census years 1900-2000
$g.labels = {0 => '1900',1 => '10',2 => '20',3 => '30',4 => '40',
5 => '50',6 => '60',7 => '70',8 => '80',9 => '90',10 => '2000'}
#configure graph appearance
$g.minimum_value= 0
$g.maximum_value= 1000
$g.y_axis_label= "Name Rank"
$g.x_axis_label= "Census Year"
#***WHY DOESNT THIS WORK?!?!?!?***
$g.y_axis_increment= 100
$g.write('graph.gif') #create graph file
#update the output to show the graph
$output_label.configure(:image => TkPhotoImage.new(:file => "graph.gif"))
$entry_field.value = nil #clear entry field
`rm graph.gif` #remove the graph file
end
My problem is, when I use g.y_axis_increment= 100, the graph will not draw and gives the error "ArgumentError, wrong number of arguments (1 for 0)" and it points to this line: - Code:
-
$g.write('graph.gif') #create graph file
This would normally suggest that the write function shouldnt take an argument, however, when I comment the g.y_axis_increment= 100, the program runs flawlessly. Anyone have a clue why this line would break the write function? |
|
Database
Member
Posts : 318
Join date : 2012-03-04
| | Subject: Re: Gruff graphs problem Fri Jul 27, 2012 10:55 pm | |
| g.write ----- g cant be used because .write isnt a method that pretains to the object of g....write is used to write the given string to [I]IO[I]
an example of write would be this :
number = STDOUT.write( "whatever text\n")
puts "Just wrote #{number} bytes to the screen" |
|
Useless