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/// Mark types for Grammar of Graphics
///
/// Marks define how data is visually represented (points, lines, areas, etc.)
/// Visual mark types for data representation
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Mark {
/// Line connecting data points
Line,
/// Filled area under/between lines
Area,
/// Vertical or horizontal bars
Bar,
/// Individual points/circles
Point,
/// Circles with variable size
Circle,
/// Arcs (for Pie and Donut charts)
Arc,
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_mark_equality() {
assert_eq!(Mark::Line, Mark::Line);
assert_ne!(Mark::Line, Mark::Bar);
}
#[test]
fn test_mark_copy() {
let mark1 = Mark::Point;
let mark2 = mark1;
assert_eq!(mark1, mark2);
}
#[test]
fn test_mark_debug() {
let mark = Mark::Area;
let debug_str = format!("{:?}", mark);
assert!(debug_str.contains("Area"));
}
}