... | ... | @@ -133,4 +133,10 @@ So the best arragement depends on how much categories have to be depicted in the |
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### Complex bar charts
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When it comes to displaying multiple sets of data in a single bar chart, there is the possibility to group the bars into categories or to stack them. However, stacked bar charts will not be discussed further or implemented, since they tend not to be well known amongst visually impaired users. In a recent evaluation conducted with a wide heterogenous set of 48 participants, "most participants were unfamiliar with stacked bars (69%). [...] The meaning of stacked bar charts can be misunderstood. Participants reported high mental effort when analysing data in stacked bar charts." (Engel & Weber, 2019: 13) |
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When it comes to displaying multiple sets of data in a single bar chart, there is the possibility to group the bars into categories or to stack them. However, stacked bar charts will not be discussed further or implemented, since they tend not to be well known amongst visually impaired users. In a recent evaluation conducted with a wide heterogenous set of 48 participants, "most participants were unfamiliar with stacked bars (69%). [...] The meaning of stacked bar charts can be misunderstood. Participants reported high mental effort when analysing data in stacked bar charts." (Engel & Weber, 2019: 13)
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The width of the generated bars is mostly dependend on the overall available space and the distance between bars. When using textured bars, wider bars are considered more readable for the majority of visually impaired users as shown by (Engel & Weber, 2019: 13). Any implementation creating a braille version bar chart should therefore choose the maximum possible bar width. Since some users may disagree and to prevent *very wide* bars, a user defined limit should still be possible to apply.
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Engel & Weber (2019) also presented the importance of the bar distance for the chart readability. Because of this, the user should also be able to define the distances between groups of bars and bars inside a group. |
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