diff --git a/src/cartographer.js b/src/cartographer.js
index 8cf3a14..787a759 100644
--- a/src/cartographer.js
+++ b/src/cartographer.js
@@ -65,7 +65,10 @@ export default class Cartographer {
 			canvasHeight - (this.tileHeight() / 2);
 	}
 
-	move(event) {
+	move (event) {
+		if (!has(event, 'height')) event.height = event.target.offsetHeight;
+		if (!has(event, 'width')) event.width = event.target.offsetWidth;
+
 		const newX = this.originX + event.deltaX;
 		const newY = this.originY + event.deltaY;
 
@@ -88,8 +91,8 @@ export default class Cartographer {
 	}
 
 	_checkMovePositiveTiles(event) {
-		const canvasWidth = event.target.offsetWidth;
-		const canvasHeight = event.target.offsetHeight;
+		const canvasWidth = event.width;
+		const canvasHeight = event.height;
 
 		const colWidth = this.horizontalDistance();
 		const rowHeight = this.verticalDistance();
@@ -120,7 +123,7 @@ export default class Cartographer {
 		const rowHeight = this.verticalDistance();
 
 		if (this.width) {
-			const canvasWidth = event.target.offsetWidth;
+			const canvasWidth = event.width;
 			const halfBoardWidth = (this.width * colWidth + this.horizontalOverhang()) / 2;
 
 			this.originX = this.originX > halfBoardWidth ? halfBoardWidth :
@@ -129,7 +132,7 @@ export default class Cartographer {
 		}
 
 		if (this.height) {
-			const canvasHeight = event.target.offsetHeight;
+			const canvasHeight = event.height;
 			const halfBoardHeight = (this.height * rowHeight + this.verticalOverhang()) / 2;
 
 			this.originY = this.originY > halfBoardHeight ? halfBoardHeight :
@@ -153,10 +156,8 @@ export default class Cartographer {
 			this.move({
 				deltaX: (((event.offsetX - this.originX) / scaleOrig) * (scaleOrig - scaleTemp)),
 				deltaY: (((event.offsetY - this.originY) / scaleOrig) * (scaleOrig - scaleTemp)),
-				target: {
-					offsetWidth: event.target.offsetWidth,
-					offsetHeight: event.target.offsetHeight,
-				},
+				width: event.target.offsetWidth,
+				height: event.target.offsetHeight,
 			});
 		}
 	}
diff --git a/src/tessellate.js b/src/tessellate.js
index 3b98202..7327b24 100644
--- a/src/tessellate.js
+++ b/src/tessellate.js
@@ -253,10 +253,8 @@ export class Tessellate {
 		const moveForScale = {
 			deltaX: (((centerX - originX) / scaleOrig) * (scaleOrig - scaleNew)),
 			deltaY: (((centerY - originY) / scaleOrig) * (scaleOrig - scaleNew)),
-			target: {
-				offsetWidth: event.width,
-				offsetHeight: event.height,
-			},
+			height: event.height,
+			width: event.width,
 		};
 
 		this.move(moveForScale);