1 files changed, 13 insertions, 0 deletions
diff --git a/structs.go b/structs.go
index f096e2a..565ce28 100644
--- a/structs.go
+++ b/structs.go
@@ -130,6 +130,19 @@ func (r *rectType) Width() int {
 }
 
 func (r *rectType) Height() int {
+	if r.h0 == 0 && r.h1 == 0 {
+		// edge case. only return 0 for these
+		return 0
+	}
+	if r.h1 == r.h0 {
+		// if they are equal, it's actually height = 1
+		return 1
+	}
+	if r.h1-r.h0 < 1 {
+		// can't have negatives. something is wrong. return 1 for now
+		return 1
+	}
+
 	return r.h1 - r.h0
 }