Initial Commit

src/circle.rs

@@ -0,0 +1,42 @@
+use std::f64::consts::PI;
+use tui::style::Color;
+use tui::widgets::canvas::{Painter, Shape};
+
+pub struct Circle {
+    pub x: f64,
+    pub y: f64,
+    pub r: f64,
+    pub start: u16,
+    pub stop: u16,
+    pub color: Color,
+}
+
+impl Default for Circle {
+    fn default() -> Self {
+        Self {
+            x: 0.0,
+            y: 0.0,
+            r: 1.0,
+            start: 0,
+            stop: 360,
+            color: Color::White,
+        }
+    }
+}
+
+impl Shape for Circle {
+    fn draw(&self, painter: &mut Painter) {
+        let (x, y) = (self.x, self.y - self.r);
+
+        for angle in (self.start..self.stop).map(|n| n as f64 / 180.0 * PI) {
+            let (x, y) = rotate(x, y, angle);
+            if let Some((x, y)) = painter.get_point(x, y) {
+                painter.paint(x, y, self.color);
+            }
+        }
+    }
+}
+
+fn rotate(x: f64, y: f64, a: f64) -> (f64, f64) {
+    ((x * a.cos() - y * a.sin()), (x * a.sin() + y * a.cos()))
+}