Refactor graph and misc

factorio-core/src/visualize/mod.rs

@@ -85,6 +85,14 @@ impl Color {
         Self::new(255, 255, 255)
     }
 
+    pub fn cyan() -> Self {
+        Self::new(0x0f, 0xf0, 0xfc)
+    }
+
+    pub fn gray(l: u8) -> Self {
+        Self::new(l, l, l)
+    }
+
     pub fn index(i: usize) -> Self {
         let c = [
             Color::new(0xe6, 0x00, 0x49),