Start at Zero (#6)

src/cartographerFlatXYZ.js

@@ -10,9 +10,15 @@ export default class CartographerFlatXYZ extends Cartographer {
 		super(settings);
 
 		[
+			'tileHeight',
+			'tileWidth',
+
 			'maxWidth',
 			'minWidth',
 
+			'horizontalOverhang',
+			'verticalOverhang',
+
 			'horizontalDistance',
 			'verticalDistance',
 
@@ -25,6 +31,14 @@ export default class CartographerFlatXYZ extends Cartographer {
 		].map(method => this[method] = this[method].bind(this));
 	}
 
+	tileHeight() {
+		return this.minWidth();
+	}
+
+	tileWidth() {
+		return this.maxWidth();
+	}
+
 	maxWidth() {
 		return this.scale * 2;
 	}
@@ -33,6 +47,14 @@ export default class CartographerFlatXYZ extends Cartographer {
 		return this.scale * sqrt3;
 	}
 
+	horizontalOverhang() {
+		return this.maxWidth() * 0.25;
+	}
+
+	verticalOverhang() {
+		return 0;
+	}
+
 	horizontalDistance() {
 		return this.maxWidth() * (3/4);
 	}
@@ -42,7 +64,7 @@ export default class CartographerFlatXYZ extends Cartographer {
 	}
 
 	calculateHorizontalScale(pixels, tiles) {
-		return pixels / (tiles * (3/4)) / 2;
+		return pixels / (tiles * 0.75 + 0.25) / 2;
 	}
 
 	calculateVerticalScale(pixels, tiles) {