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Translation of values for ggplot2 size and stroke #80

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ijlyttle opened this issue Dec 27, 2019 · 0 comments
Open

Translation of values for ggplot2 size and stroke #80

ijlyttle opened this issue Dec 27, 2019 · 0 comments

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@ijlyttle
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This concerns when we specify a value, as opposed to a field (variable) to map to:

Points:

  • ggplot2: size refers to the width of the point in mm
  • Vega-Lite: size refers to the area of the point in pixels

Other marks:

  • ggplot2: size refers to the width of a line stroke in mm
  • Vega-Lite: strokeWidth refers to the width of a line in pixels

Given a standard dpi of 96, we ought to be able to come up with straightforward translations.
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@ijlyttle