django-nuages-tag 0.1.2

1. Source data

Given that we have a my_favourite_tools context variable defined like this:

my_favourite_tools = [{'name': 'Python', 'interest': 30},
                      {'name': 'Django', 'interest': 70},
                      {'name': 'Ruby', 'interest': 6}]

Note: example shows a simple list, but this also works with a Django QuerySet.

2. Compute the tag cloud

We can now do:

{% compute_tag_cloud my_favourite_tools interest font_size 10 100 lin %}

compute_tag_cloud will add a font_size attribute to each element in my_favourite_tools that is contained between 10 and 100 and is representative of the value of interest. The last parameter (lin) asks to use a linear formula to compute this tag cloud. Another option is to use a logarithmic formula (use the log parameter). You should test both options, but log will probably give you better results if there is a large variation in the values you want to compute. NOTE: 0 and negative values will be computed to 0 (with both formulas).

Our source data now looks like:

my_favourite_tools = [{'name': 'Python', 'interest': 30, 'font_size': 43.75},
                      {'name': 'Django', 'interest': 70, 'font_size': 100},
                      {'name': 'Ruby', 'interest': 6, 'font_size': 10}]

3. Render the tag cloud

This can be done very easily with the for tag and basic HTML/CSS. For example:

{% for tool in my_favourite_tools %}
  <span style="font-size: {{ tool.font_size }}px;"> {{ tool.name }} </span>
{% endfor %}