Fill color is number array. e.g: [r, g, b, a]
id is used by business logic to manage(find, update, delete, etc.) drawables
Line color is number array. e.g: [r, g, b, a]
Two dimension float array stores 2d or 3d points. e.g., You can use "[[1, 1], [2.5, 3]]" to represent a distance measurement result, "[1, 1]" is the first point, and "[2.5, 3]" is the second point.
Drawable dta type
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Drawable data, including measurement data, markup data, etc.