Added touch controller

scripts/TouchController.ts

@@ -0,0 +1,53 @@
+export class TouchController {
+	x: number
+	y: number
+
+	threshold: number
+
+	leftSwipe: Function
+	rightSwipe: Function
+	upSwipe: Function
+	downSwipe: Function
+
+	constructor() {
+		document.addEventListener("touchstart", evt => this.handleTouchStart(evt), false)
+		document.addEventListener("touchmove", evt => this.handleTouchMove(evt), false)
+
+		this.downSwipe = this.upSwipe = this.rightSwipe = this.leftSwipe = () => null
+		this.threshold = 5
+	}
+
+	handleTouchStart(evt) {
+		this.x = evt.touches[0].clientX
+		this.y = evt.touches[0].clientY
+	}
+
+	handleTouchMove(evt) {
+		if(!this.x || !this.y) {
+			return
+		}
+
+		let xUp = evt.touches[0].clientX
+		let yUp = evt.touches[0].clientY
+
+		let xDiff = this.x - xUp
+		let yDiff = this.y - yUp
+
+		if(Math.abs(xDiff) > Math.abs(yDiff)) {
+			if(xDiff > this.threshold) {
+				this.leftSwipe()
+			} else if(xDiff < -this.threshold) {
+				this.rightSwipe()
+			}
+		} else {
+			if(yDiff > this.threshold) {
+				this.upSwipe()
+			} else if(yDiff < -this.threshold) {
+				this.downSwipe()
+			}
+		}
+		
+		this.x = undefined
+		this.y = undefined
+	}
+}