Start at Zero (#6)

src/cartographerFlatXY.js

@@ -10,9 +10,15 @@ export default class CartographerFlatXY extends Cartographer {
 		super(settings);
 
 		[
+			'tileHeight',
+			'tileWidth',
+
 			'maxWidth',
 			'minWidth',
 
+			'horizontalOverhang',
+			'verticalOverhang',
+
 			'horizontalDistance',
 			'verticalDistance',
 
@@ -25,6 +31,14 @@ export default class CartographerFlatXY extends Cartographer {
 		].map(method => this[method] = this[method].bind(this));
 	}
 
+	tileHeight() {
+		return this.minWidth();
+	}
+
+	tileWidth() {
+		return this.minWidth();
+	}
+
 	maxWidth() {
 		return this.minWidth() * sqrt2;
 	}
@@ -33,6 +47,14 @@ export default class CartographerFlatXY extends Cartographer {
 		return this.scale * 2;
 	}
 
+	horizontalOverhang() {
+		return 0;
+	}
+
+	verticalOverhang() {
+		return 0;
+	}
+
 	horizontalDistance() {
 		return this.minWidth();
 	}