+square

src/ex.rs

@@ -78,6 +78,20 @@ pub fn stadion(t: f64, gap: f64) -> [f64; 2] {
     }
 }
 
+pub fn square(t: f64) -> [f64; 2] {
+    let t4 = t * 4.0;
+    let (a, b) = if t < 0.25 {
+        (t4, 0.0)
+    } else if t < 0.5 {
+        (1.0, t4 - 1.0)
+    } else if t < 0.75 {
+        (3.0 - t4, 1.0)
+    } else {
+        (0.0, 4.0 - t4)
+    };
+    [a, b]
+}
+
 pub fn wobbly(t: f64, wob: u32) -> [f64; 2] {
     let tt2pi = t * core::f64::consts::TAU;
     let (ttsin, ttcos) = tt2pi.sin_cos();

src/lib.rs

@@ -21,6 +21,7 @@ pub enum SelectExample {
     Spiral1D { k: u32 },
 
     Circle,
+    Square,
     Intersect8,
     Intersect8pp,
 }
@@ -48,6 +49,7 @@ impl SelectExample {
             Self::Spiral { .. }
             | Self::Spiral1D { .. }
             | Self::Circle
+            | Self::Square
             | Self::Intersect8
             | Self::Intersect8pp => {
                 panic!("offsetting not supported for this example")
@@ -69,6 +71,7 @@ impl SelectExample {
             Self::Spiral { k } => Box::new(ex::spiral(k)),
             Self::Spiral1D { k } => Box::new(ex::spiral_1d(k)),
             Self::Circle => Box::new(ex::circle),
+            Self::Square => Box::new(ex::square),
             Self::Intersect8 => Box::new(ex::intersect_eight),
             Self::Intersect8pp => Box::new(ex::intersect_8pp),
         }