rename modifier to transformer

src/transformer.rs

@@ -0,0 +1,59 @@
+use crate::point::Point;
+
+pub trait Transformers {
+    fn apply(&self, point_list: &Vec<Point>) -> Vec<Point>;
+}
+
+/// Translate
+
+#[derive(Debug,Clone,Copy)]
+pub struct Translate {
+    x: f32,
+    y: f32
+}
+
+impl Translate {
+    pub fn new(x: f32, y: f32) -> Self {
+	Self { x, y }
+    }
+}
+
+impl Transformers for Translate {
+    fn apply(&self, point_list: &Vec<Point>) -> Vec<Point> {
+	point_list.iter()
+	    .map(| pt | {
+		Point { x: pt.x + self.x,
+			y: pt.y + self.y,
+			..*pt
+		}
+	    }).collect()
+    }
+}
+
+/// Replicate
+
+#[derive(Debug,Clone,Copy)]
+pub enum Replicate {
+    Until(usize),
+    Times(usize)
+}
+
+impl Transformers for Replicate {
+    fn apply(&self, point_list: &Vec<Point>) -> Vec<Point> {
+	let mut point_list2 = vec![];
+	match self {
+	    Replicate::Until(n) => {
+		while point_list2.len() < *n {
+		    point_list2.append(&mut point_list.clone());
+		}
+	    },
+	    Replicate::Times(n) => {
+		for _ in 0..*n {
+		    point_list2.append(&mut point_list.clone());
+		}
+	    }
+	}
+	point_list2
+    }
+}
+