From c103609550f9d0f53f9faacc48336b2df1c70244 Mon Sep 17 00:00:00 2001
From: Henry Schimke <henry@azule.info>
Date: Fri, 31 Mar 2023 20:08:57 -0500
Subject: [PATCH] port stepToNextEdge

---
 .../fast_edge_to_edge_counter.rs              | 34 +++++++++++--------
 1 file changed, 19 insertions(+), 15 deletions(-)

diff --git a/src/common/cpp_essentials/fast_edge_to_edge_counter.rs b/src/common/cpp_essentials/fast_edge_to_edge_counter.rs
index 3913f19..10aad9f 100644
--- a/src/common/cpp_essentials/fast_edge_to_edge_counter.rs
+++ b/src/common/cpp_essentials/fast_edge_to_edge_counter.rs
@@ -45,22 +45,26 @@ impl FastEdgeToEdgeCounter {
         }
     }
 
-    pub fn stepToNextEdge(&self, _range: i32) -> i32 {
-        todo!()
-        // int maxSteps = std::min(stepsToBorder, range);
-        // int steps = 0;
-        // do {
-        // 	if (++steps > maxSteps) {
-        // 		if (maxSteps == stepsToBorder)
-        // 			break;
-        // 		else
-        // 			return 0;
-        // 	}
-        // } while (p[steps * stride] == p[0]);
+    pub fn stepToNextEdge(&self, range: u32) -> u32 {
+        let maxSteps = std::cmp::min(self.stepsToBorder, range);
+        let steps = 0;
+        loop {
+            steps += 1;
+            if (steps > maxSteps) {
+                if (maxSteps == self.stepsToBorder) {
+                    break;
+                } else {
+                    return 0;
+                }
+            }
+            if !(self.arr.get((steps * self.stride) as usize) == self.arr.get(0)) {
+                break;
+            }
+        } // while (p[steps * stride] == p[0]);
 
-        // p += steps * stride;
-        // stepsToBorder -= steps;
+        self.p += steps * self.stride;
+        self.stepsToBorder -= steps;
 
-        // return steps;
+        return steps;
     }
 }