Working on tap behavior of scatter and flippables.

dist/iwmlib.js

@@ -987,6 +987,13 @@
             return Math.sqrt(dx * dx + dy * dy)
         }
 
+        // Distance == 0.0 indicates an inside relation.
+        static distanceToRect(p, r) {
+            var cx = Math.max(Math.min(p.x, r.x + r.width), r.x);
+            var cy = Math.max(Math.min(p.y, r.y + r.height), r.y);
+            return Math.sqrt((p.x - cx) * (p.x - cx) + (p.y - cy) * (p.y - cy))
+        }
+
         static fromPageToNode(element, p) {
             //    if (window.webkitConvertPointFromPageToNode) {
             //             return window.webkitConvertPointFromPageToNode(element,
@@ -3815,38 +3822,6 @@
                 onMove = null
             } = {}
         ) {
-<<<<<<< HEAD
-            this.onCapture = null;
-            this.element = element;
-            if (stopEvents === 'auto') {
-                /*
-                The events have to be stopped in Safari, otherwise the whole page will be zoomed with
-                a pinch gesture (preventDefault in method preventPinch). In order to enable the
-                movement of scatter objects, the touchmove event has to be bound again.
-                */
-                if (Capabilities.isSafari) {
-                    document.addEventListener(
-                        'touchmove',
-                        event => this.preventPinch(event),
-                        false
-                    );
-                    stopEvents = false;
-                } else {
-                    stopEvents = true;
-                }
-            }
-            this.stopEvents = stopEvents;
-            this.claimEvents = claimEvents;
-            if (touchAction !== null) {
-                Elements$1.setStyle(element, { touchAction });
-            }
-            this.scatter = new Map();
-            this.delegate = new InteractionMapper$1(element, this, {
-                useCapture,
-                mouseWheelElement: window
-            });
-=======
->>>>>>> a3f7eb0b3cc9f48cfee3ce6c45887bf25617d1bc
 
 
             let notchPosition = (switchPos && point.y < 50) ? "topCenter" : "bottomCenter";
@@ -4753,52 +4728,6 @@
             }
         }
 
-<<<<<<< HEAD
-    class DOMFlippable {
-        constructor(element, scatter, flip) {
-            // Set log to console.log or a custom log function
-            // define data structures to store our touchpoints in
-
-            this.element = element;
-            this.flip = flip;
-            this.card = element.querySelector('.flipCard');
-            this.front = element.querySelector('.front');
-            this.back = element.querySelector('.back');
-            this.flipped = false;
-            this.scatter = scatter;
-            this.onFrontFlipped = flip.onFrontFlipped;
-            this.onBackFlipped = flip.onBackFlipped;
-            this.onClose = flip.onClose;
-            this.onRemoved = flip.onRemoved;
-            this.onUpdate = flip.onUpdate;
-
-            this.flipDuration = flip.flipDuration;
-            this.fadeDuration = flip.fadeDuration;
-            scatter.addTransformEventCallback(this.scatterTransformed.bind(this));
-            console.log('lib.DOMFlippable', 5000);
-            TweenLite.set(this.element, { perspective: 5000 });
-            TweenLite.set(this.card, { transformStyle: 'preserve-3d' });
-            TweenLite.set(this.back, { rotationY: -180 });
-            TweenLite.set([this.back, this.front], {
-                backfaceVisibility: 'hidden',
-                perspective: 5000
-            });
-            TweenLite.set(this.front, { visibility: 'visible' });
-            this.infoBtn = element.querySelector('.infoBtn');
-            this.backBtn = element.querySelector('.backBtn');
-            this.closeBtn = element.querySelector('.closeBtn');
-            /* Buttons are not guaranteed to exist. */
-            if (this.infoBtn) {
-                InteractionMapper$1.on('tap', this.infoBtn, event => this.flip.start());
-                this.enable(this.infoBtn);
-            }
-            if (this.backBtn) {
-                InteractionMapper$1.on('tap', this.backBtn, event => this.start());
-            }
-            if (this.closeBtn) {
-                InteractionMapper$1.on('tap', this.closeBtn, event => this.close());
-                this.enable(this.closeBtn);
-=======
         /**
          * For a given zoom, a new scale is calculated, taking
          * min and max scale into account.
@@ -4814,7 +4743,6 @@
             if (scale < minScale) {
                 scale = minScale;
                 zoom = scale / this.scale;
->>>>>>> a3f7eb0b3cc9f48cfee3ce6c45887bf25617d1bc
             }
             if (scale > maxScale) {
                 scale = maxScale;
@@ -5065,6 +4993,11 @@
             this.onCapture = null;
             this.element = element;
             if (stopEvents === 'auto') {
+                /*
+                The events have to be stopped in Safari, otherwise the whole page will be zoomed with
+                a pinch gesture (preventDefault in method preventPinch). In order to enable the
+                movement of scatter objects, the touchmove event has to be bound again.
+                */
                 if (Capabilities.isSafari) {
                     document.addEventListener(
                         'touchmove',
@@ -5118,7 +5051,7 @@
                 context.stroke();
             }
             requestAnimationFrame(dt => {
-                this.showTouches(dt);
+                this.showTouches(dt, canvas);
             });
         }
 
@@ -5230,6 +5163,7 @@
                 height = null,  // required
                 resizable = false,
                 clickOnTap = false,
+                allowClickDistance = 44,
                 verbose = true,
                 onResize = null,
                 touchAction = 'none',
@@ -5293,7 +5227,8 @@
                 rotation: this.startRotationDegrees,
                 transformOrigin: transformOrigin
             };
-
+            this.tapNodes = new Map();
+            this.allowClickDistance = allowClickDistance;
 
             // For tweenlite we need initial values in _gsTransform
             TweenLite.set(element, this.initialValues);
@@ -5486,16 +5421,99 @@
         }
 
         onTap(event, interaction, point) {
+            
             if (this.clickOnTap) {
-                let p = Points.fromPageToNode(this.element, point);
+                let directNode = document.elementFromPoint(point.x, point.y);
-                let element = document.elementFromPoint(p.x, p.y);
+                let nearestNode = this.nearestClickable(event);
-                if (element != null) {
+
-                    console.log('tap simulates click');
+                console.log("onTap", directNode, nearestNode.tagName);
-                    element.click();
+                if (directNode != null && this.isClickable(directNode)) {
+                    directNode.click();
+                }
+                else {
+                    if (nearestNode.tagName == 'svg' && this.isClickable(nearestNode)) {
+                        let handler = this.tapNodes.get(nearestNode);
+                        console.log("Clicking beneath SVG: to be done", handler);
+                        Events.stop(event);
+                        //nearestNode.click()
+                    }
                 }
             }
         }
 
+        /**
+         * Adds a click or tap behavior to the node. Uses
+         * either the scatter clickOnTap version which requires click handlers
+         * or uses the hammer.js driven tap handler.
+         *
+         * @param {*} node
+         * @param {*} handler
+         * @memberof DOMScatter
+         */
+
+        addTapListener(node, handler) {
+            if (this.clickOnTap) {
+                node.addEventListener('click', handler);
+                this.tapNodes.set(node, handler);
+            }
+            else {
+                InteractionMapper$1.on('tap', node, handler);
+            }
+        }
+
+        isClickable(node) {
+            if (node.tagName == 'A')
+                return true
+            if (this.tapNodes.has(node)) 
+                return true
+            return false
+        }
+
+        /**
+         * Returns an array of all clickable nodes.
+         * Unfortunately we cannot search for all nodes with an attached 'click' event listener
+         * See https://stackoverflow.com/questions/11455515/how-to-check-whether-dynamically-attached-event-listener-exists-or-not
+         * Therefore we can only detect the following standard cases:
+         * I. All clickable objects like clickables
+         * II. Objects that have been attached a click handler by the scatter itself via 
+         */
+        clickableNodes() {
+            let result = [];
+            for (let node of this.element.querySelectorAll("*")) {
+                if (this.isClickable(node))
+                    result.push(node);
+            }
+            return result
+        }
+
+        nearestClickable(event) {
+            let element = this.element;
+            let clickables = this.clickableNodes();
+            let globalClick = (event.center) ? event.center : { x: event.x, y: event.y };
+            let localClick = Points.fromPageToNode(element, globalClick);
+
+            let clickRects = clickables.map(link => {
+                let rect = link.getBoundingClientRect();
+                let topLeft = Points.fromPageToNode(element, rect);
+                let center = Points.fromPageToNode(element, { x: rect.x + rect.width / 2, y: rect.y + rect.height / 2 });
+                return { x: topLeft.x, y: topLeft.y, width: rect.width, height: rect.height, center, link }
+            });
+
+            let distances = [];
+            clickRects.forEach(rect => {
+                let distance = Points.distanceToRect(localClick, rect);
+                distances.push(parseInt(distance));
+            });
+
+            let closestClickIndex = distances.indexOf(Math.min(...distances));
+            let closestClickable = clickables[closestClickIndex];
+            if (distances[closestClickIndex] < this.allowClickDistance) {
+                console.log("found closest clickables", closestClickable);
+                return closestClickable
+            }
+            return null
+        }
+
         isDescendant(parent, child) {
             let node = child.parentNode;
             while (node != null) {
@@ -5815,6 +5833,7 @@
                 translatable = true,
                 scalable = true,
                 rotatable = true,
+                clickOnTap = false,
                 onFront = null,
                 onBack = null,
                 onClose = null,
@@ -5834,6 +5853,7 @@
             this.translatable = translatable;
             this.scalable = scalable;
             this.rotatable = rotatable;
+            this.clickOnTap = clickOnTap;
             this.onFrontFlipped = onFront;
             this.onBackFlipped = onBack;
             this.onClose = onClose;
@@ -5888,7 +5908,8 @@
                         translatable: this.translatable,
                         scalable: this.scalable,
                         rotatable: this.rotatable,
-                        overdoScaling: this.overdoScaling
+                        overdoScaling: this.overdoScaling,
+                        clickOnTap: this.clickOnTap
                     }
                 );
 
@@ -5897,7 +5918,6 @@
                 }
 
                 if (this.closeOnMinScale) {
-
                     const removeOnMinScale = function () {
                         if (scatter.scale <= scatter.minScale) {
                             this.flippable.close();
@@ -5912,11 +5932,7 @@
                                 scatter.onTransform.splice(callbackIdx, 1);
                             }
                         }
-
                     }.bind(this);
-
-
-
                     scatter.addTransformEventCallback(removeOnMinScale);
                 }
 
@@ -5952,8 +5968,11 @@
         }
 
         start({ targetCenter = null } = {}) {
-            console.log('DOMFlip.start', targetCenter);
+            console.log("DOMFlip.start", targetCenter);
-            if (this.preloadBack) this.flippable.start({ duration: this.flipDuration, targetCenter });
+            if (this.preloadBack) {
+                
+                this.flippable.start({ duration: this.flipDuration, targetCenter });
+            }
             else {
                 let back = this.cardWrapper.querySelector('.back');
                 let flippable = this.flippable;
@@ -6005,7 +6024,7 @@
             this.flipDuration = flip.flipDuration;
             this.fadeDuration = flip.fadeDuration;
             scatter.addTransformEventCallback(this.scatterTransformed.bind(this));
-            console.log('lib.DOMFlippable', 5000);
+
             TweenLite.set(this.element, { perspective: 5000 });
             TweenLite.set(this.card, { transformStyle: 'preserve-3d' });
             TweenLite.set(this.back, { rotationY: -180 });
@@ -6018,16 +6037,24 @@
             this.backBtn = element.querySelector('.backBtn');
             this.closeBtn = element.querySelector('.closeBtn');
             /* Buttons are not guaranteed to exist. */
-            if (this.infoBtn) {
-                InteractionMapper$1.on('tap', this.infoBtn, event => this.flip.start());
 
+            if (this.infoBtn) {
+                scatter.addTapListener(this.infoBtn, event => {
+                    console.log("within click handler", this);
+                    this.flip.start();
+                });
                 this.enable(this.infoBtn);
             }
             if (this.backBtn) {
-                InteractionMapper$1.on('tap', this.backBtn, event => this.start());
+                scatter.addTapListener(this.backBtn, event => {
+                    console.log("within click handler", this);
+                    this.start();
+                });
             }
             if (this.closeBtn) {
-                InteractionMapper$1.on('tap', this.closeBtn, event => this.close());
+                scatter.addTapListener(this.closeBtn, event => {
+                    this.close();
+                });
                 this.enable(this.closeBtn);
             }
             this.scaleButtons();
@@ -6077,18 +6104,6 @@
         }
 
         scaleButtons() {
-            //This also works for svgs.
-            // if (this.infoBtn)
-            //     this.infoBtn.style.transform = "scale(" + this.buttonScale + ")"
-
-            // if (this.backBtn)
-            //     this.backBtn.style.transform = "scale(" + this.buttonScale + ")"
-
-            // if (this.closeBtn)
-            //     this.closeBtn.style.transform = "scale(" + this.buttonScale + ")"
-
-            console.log(this.buttonScale);
-            //// This did not work with svgs!
             TweenLite.set([this.infoBtn, this.backBtn, this.closeBtn], {
                 scale: this.buttonScale
             });
@@ -6101,6 +6116,7 @@
 
         clickInfo() {
             this.bringToFront();
+            console.log("clickInfo");
             this.infoBtn.click();
         }
 
@@ -6142,8 +6158,6 @@
             }
         }
 
-
-
         enable(button) {
             this.show(button, this.fadeDuration);
             if (button) {
@@ -6153,9 +6167,6 @@
 
         disable(button) {
             this.hide(button, this.fadeDuration);
-            if (button) {
-                TweenLite.set(button, { pointerEvents: 'none' });
-            }
         }
 
         start({ targetCenter = null } = {}) {
@@ -6199,7 +6210,6 @@
             let x = this.flipped ? xx : this.startX;
             let y = this.flipped ? yy : this.startY;
 
-            console.log("DOMFlippable.start", this.flipped, targetCenter, x, y, this.saved);
             let onUpdate = this.onUpdate !== null ? () => this.onUpdate(this) : null;
             console.log(this.flipDuration);
             TweenLite.to(this.card, this.flipDuration, {

dist/iwmlib.pixi.js

@@ -3263,6 +3263,13 @@
             return Math.sqrt(dx * dx + dy * dy)
         }
 
+        // Distance == 0.0 indicates an inside relation.
+        static distanceToRect(p, r) {
+            var cx = Math.max(Math.min(p.x, r.x + r.width), r.x);
+            var cy = Math.max(Math.min(p.y, r.y + r.height), r.y);
+            return Math.sqrt((p.x - cx) * (p.x - cx) + (p.y - cy) * (p.y - cy))
+        }
+
         static fromPageToNode(element, p) {
             //    if (window.webkitConvertPointFromPageToNode) {
             //             return window.webkitConvertPointFromPageToNode(element,
@@ -6922,6 +6929,7 @@
                 height = null,  // required
                 resizable = false,
                 clickOnTap = false,
+                allowClickDistance = 44,
                 verbose = true,
                 onResize = null,
                 touchAction = 'none',
@@ -6985,7 +6993,8 @@
                 rotation: this.startRotationDegrees,
                 transformOrigin: transformOrigin
             };
-
+            this.tapNodes = new Map();
+            this.allowClickDistance = allowClickDistance;
 
             // For tweenlite we need initial values in _gsTransform
             TweenLite.set(element, this.initialValues);
@@ -7178,16 +7187,99 @@
         }
 
         onTap(event, interaction, point) {
+            
             if (this.clickOnTap) {
-                let p = Points.fromPageToNode(this.element, point);
+                let directNode = document.elementFromPoint(point.x, point.y);
-                let element = document.elementFromPoint(p.x, p.y);
+                let nearestNode = this.nearestClickable(event);
-                if (element != null) {
+
-                    console.log('tap simulates click');
+                console.log("onTap", directNode, nearestNode.tagName);
-                    element.click();
+                if (directNode != null && this.isClickable(directNode)) {
+                    directNode.click();
+                }
+                else {
+                    if (nearestNode.tagName == 'svg' && this.isClickable(nearestNode)) {
+                        let handler = this.tapNodes.get(nearestNode);
+                        console.log("Clicking beneath SVG: to be done", handler);
+                        Events$1.stop(event);
+                        //nearestNode.click()
+                    }
                 }
             }
         }
 
+        /**
+         * Adds a click or tap behavior to the node. Uses
+         * either the scatter clickOnTap version which requires click handlers
+         * or uses the hammer.js driven tap handler.
+         *
+         * @param {*} node
+         * @param {*} handler
+         * @memberof DOMScatter
+         */
+
+        addTapListener(node, handler) {
+            if (this.clickOnTap) {
+                node.addEventListener('click', handler);
+                this.tapNodes.set(node, handler);
+            }
+            else {
+                InteractionMapper$1.on('tap', node, handler);
+            }
+        }
+
+        isClickable(node) {
+            if (node.tagName == 'A')
+                return true
+            if (this.tapNodes.has(node)) 
+                return true
+            return false
+        }
+
+        /**
+         * Returns an array of all clickable nodes.
+         * Unfortunately we cannot search for all nodes with an attached 'click' event listener
+         * See https://stackoverflow.com/questions/11455515/how-to-check-whether-dynamically-attached-event-listener-exists-or-not
+         * Therefore we can only detect the following standard cases:
+         * I. All clickable objects like clickables
+         * II. Objects that have been attached a click handler by the scatter itself via 
+         */
+        clickableNodes() {
+            let result = [];
+            for (let node of this.element.querySelectorAll("*")) {
+                if (this.isClickable(node))
+                    result.push(node);
+            }
+            return result
+        }
+
+        nearestClickable(event) {
+            let element = this.element;
+            let clickables = this.clickableNodes();
+            let globalClick = (event.center) ? event.center : { x: event.x, y: event.y };
+            let localClick = Points.fromPageToNode(element, globalClick);
+
+            let clickRects = clickables.map(link => {
+                let rect = link.getBoundingClientRect();
+                let topLeft = Points.fromPageToNode(element, rect);
+                let center = Points.fromPageToNode(element, { x: rect.x + rect.width / 2, y: rect.y + rect.height / 2 });
+                return { x: topLeft.x, y: topLeft.y, width: rect.width, height: rect.height, center, link }
+            });
+
+            let distances = [];
+            clickRects.forEach(rect => {
+                let distance = Points.distanceToRect(localClick, rect);
+                distances.push(parseInt(distance));
+            });
+
+            let closestClickIndex = distances.indexOf(Math.min(...distances));
+            let closestClickable = clickables[closestClickIndex];
+            if (distances[closestClickIndex] < this.allowClickDistance) {
+                console.log("found closest clickables", closestClickable);
+                return closestClickable
+            }
+            return null
+        }
+
         isDescendant(parent, child) {
             let node = child.parentNode;
             while (node != null) {
@@ -7373,6 +7465,7 @@
                 translatable = true,
                 scalable = true,
                 rotatable = true,
+                clickOnTap = false,
                 onFront = null,
                 onBack = null,
                 onClose = null,
@@ -7392,6 +7485,7 @@
             this.translatable = translatable;
             this.scalable = scalable;
             this.rotatable = rotatable;
+            this.clickOnTap = clickOnTap;
             this.onFrontFlipped = onFront;
             this.onBackFlipped = onBack;
             this.onClose = onClose;
@@ -7446,7 +7540,8 @@
                         translatable: this.translatable,
                         scalable: this.scalable,
                         rotatable: this.rotatable,
-                        overdoScaling: this.overdoScaling
+                        overdoScaling: this.overdoScaling,
+                        clickOnTap: this.clickOnTap
                     }
                 );
 
@@ -7455,7 +7550,6 @@
                 }
 
                 if (this.closeOnMinScale) {
-
                     const removeOnMinScale = function () {
                         if (scatter.scale <= scatter.minScale) {
                             this.flippable.close();
@@ -7470,11 +7564,7 @@
                                 scatter.onTransform.splice(callbackIdx, 1);
                             }
                         }
-
                     }.bind(this);
-
-
-
                     scatter.addTransformEventCallback(removeOnMinScale);
                 }
 
@@ -7510,8 +7600,11 @@
         }
 
         start({ targetCenter = null } = {}) {
-            console.log('DOMFlip.start', targetCenter);
+            console.log("DOMFlip.start", targetCenter);
-            if (this.preloadBack) this.flippable.start({ duration: this.flipDuration, targetCenter });
+            if (this.preloadBack) {
+                
+                this.flippable.start({ duration: this.flipDuration, targetCenter });
+            }
             else {
                 let back = this.cardWrapper.querySelector('.back');
                 let flippable = this.flippable;
@@ -7563,7 +7656,7 @@
             this.flipDuration = flip.flipDuration;
             this.fadeDuration = flip.fadeDuration;
             scatter.addTransformEventCallback(this.scatterTransformed.bind(this));
-            console.log('lib.DOMFlippable', 5000);
+
             TweenLite.set(this.element, { perspective: 5000 });
             TweenLite.set(this.card, { transformStyle: 'preserve-3d' });
             TweenLite.set(this.back, { rotationY: -180 });
@@ -7576,15 +7669,24 @@
             this.backBtn = element.querySelector('.backBtn');
             this.closeBtn = element.querySelector('.closeBtn');
             /* Buttons are not guaranteed to exist. */
+
             if (this.infoBtn) {
-                InteractionMapper$1.on('tap', this.infoBtn, event => this.flip.start());
+                scatter.addTapListener(this.infoBtn, event => {
+                    console.log("within click handler", this);
+                    this.flip.start();
+                });
                 this.enable(this.infoBtn);
             }
             if (this.backBtn) {
-                InteractionMapper$1.on('tap', this.backBtn, event => this.start());
+                scatter.addTapListener(this.backBtn, event => {
+                    console.log("within click handler", this);
+                    this.start();
+                });
             }
             if (this.closeBtn) {
-                InteractionMapper$1.on('tap', this.closeBtn, event => this.close());
+                scatter.addTapListener(this.closeBtn, event => {
+                    this.close();
+                });
                 this.enable(this.closeBtn);
             }
             this.scaleButtons();
@@ -7634,18 +7736,6 @@
         }
 
         scaleButtons() {
-            //This also works for svgs.
-            // if (this.infoBtn)
-            //     this.infoBtn.style.transform = "scale(" + this.buttonScale + ")"
-
-            // if (this.backBtn)
-            //     this.backBtn.style.transform = "scale(" + this.buttonScale + ")"
-
-            // if (this.closeBtn)
-            //     this.closeBtn.style.transform = "scale(" + this.buttonScale + ")"
-
-            console.log(this.buttonScale);
-            //// This did not work with svgs!
             TweenLite.set([this.infoBtn, this.backBtn, this.closeBtn], {
                 scale: this.buttonScale
             });
@@ -7658,6 +7748,7 @@
 
         clickInfo() {
             this.bringToFront();
+            console.log("clickInfo");
             this.infoBtn.click();
         }
 
@@ -7699,8 +7790,6 @@
             }
         }
 
-
-
         enable(button) {
             this.show(button, this.fadeDuration);
             if (button) {
@@ -7710,9 +7799,6 @@
 
         disable(button) {
             this.hide(button, this.fadeDuration);
-            if (button) {
-                TweenLite.set(button, { pointerEvents: 'none' });
-            }
         }
 
         start({ targetCenter = null } = {}) {
@@ -7756,7 +7842,6 @@
             let x = this.flipped ? xx : this.startX;
             let y = this.flipped ? yy : this.startY;
 
-            console.log("DOMFlippable.start", this.flipped, targetCenter, x, y, this.saved);
             let onUpdate = this.onUpdate !== null ? () => this.onUpdate(this) : null;
             console.log(this.flipDuration);
             TweenLite.to(this.card, this.flipDuration, {

lib/flippable.html

@@ -72,7 +72,7 @@ if (Capabilities.supportsTemplate()) {
                             flipTemplate,
                             new ImageLoader('./examples/king.jpeg'),
                             new ImageLoader('./examples/women.jpeg'),
-                            { onUpdate: e => console.log(e)})
+                            { clickOnTap: true})
     flip.load().then((flip) => {
         flip.centerAt({ x: 150, y: 120})
     })
@@ -80,10 +80,5 @@ if (Capabilities.supportsTemplate()) {
 else {
     alert("Templates not supported, use Edge, Chrome, Safari or Firefox.")
 }
-
-setTimeout(function() {
-    const infoBtn = document.querySelector('.infoBtn')
-    InteractionMapper.on('tap', infoBtn, event => console.log('go'))
-}, 2000)
 </script>
 </body>

lib/flippable.js

@@ -199,6 +199,7 @@ export class DOMFlip {
             translatable = true,
             scalable = true,
             rotatable = true,
+            clickOnTap = false,
             onFront = null,
             onBack = null,
             onClose = null,
@@ -218,6 +219,7 @@ export class DOMFlip {
         this.translatable = translatable
         this.scalable = scalable
         this.rotatable = rotatable
+        this.clickOnTap = clickOnTap
         this.onFrontFlipped = onFront
         this.onBackFlipped = onBack
         this.onClose = onClose
@@ -272,7 +274,8 @@ export class DOMFlip {
                     translatable: this.translatable,
                     scalable: this.scalable,
                     rotatable: this.rotatable,
-                    overdoScaling: this.overdoScaling
+                    overdoScaling: this.overdoScaling,
+                    clickOnTap: this.clickOnTap
                 }
             )
 
@@ -281,7 +284,6 @@ export class DOMFlip {
             }
 
             if (this.closeOnMinScale) {
-
                 const removeOnMinScale = function () {
                     if (scatter.scale <= scatter.minScale) {
                         this.flippable.close()
@@ -296,11 +298,7 @@ export class DOMFlip {
                             scatter.onTransform.splice(callbackIdx, 1)
                         }
                     }
-
                 }.bind(this)
-
-
-
                 scatter.addTransformEventCallback(removeOnMinScale)
             }
 
@@ -336,8 +334,11 @@ export class DOMFlip {
     }
 
     start({ targetCenter = null } = {}) {
-        console.log('DOMFlip.start', targetCenter)
+        console.log("DOMFlip.start", targetCenter)
-        if (this.preloadBack) this.flippable.start({ duration: this.flipDuration, targetCenter })
+        if (this.preloadBack) {
+            
+            this.flippable.start({ duration: this.flipDuration, targetCenter })
+        }
         else {
             let back = this.cardWrapper.querySelector('.back')
             let flippable = this.flippable
@@ -389,7 +390,7 @@ export class DOMFlippable {
         this.flipDuration = flip.flipDuration
         this.fadeDuration = flip.fadeDuration
         scatter.addTransformEventCallback(this.scatterTransformed.bind(this))
-        console.log('lib.DOMFlippable', 5000)
+
         TweenLite.set(this.element, { perspective: 5000 })
         TweenLite.set(this.card, { transformStyle: 'preserve-3d' })
         TweenLite.set(this.back, { rotationY: -180 })
@@ -402,15 +403,24 @@ export class DOMFlippable {
         this.backBtn = element.querySelector('.backBtn')
         this.closeBtn = element.querySelector('.closeBtn')
         /* Buttons are not guaranteed to exist. */
+
         if (this.infoBtn) {
-            InteractionMapper.on('tap', this.infoBtn, event => this.flip.start())
+            scatter.addTapListener(this.infoBtn, event => {
+                console.log("within click handler", this)
+                this.flip.start()
+            })
             this.enable(this.infoBtn)
         }
         if (this.backBtn) {
-            InteractionMapper.on('tap', this.backBtn, event => this.start())
+            scatter.addTapListener(this.backBtn, event => {
+                console.log("within click handler", this)
+                this.start()
+            })
         }
         if (this.closeBtn) {
-            InteractionMapper.on('tap', this.closeBtn, event => this.close())
+            scatter.addTapListener(this.closeBtn, event => {
+                this.close()
+            })
             this.enable(this.closeBtn)
         }
         this.scaleButtons()
@@ -460,18 +470,6 @@ export class DOMFlippable {
     }
 
     scaleButtons() {
-        //This also works for svgs.
-        // if (this.infoBtn)
-        //     this.infoBtn.style.transform = "scale(" + this.buttonScale + ")"
-
-        // if (this.backBtn)
-        //     this.backBtn.style.transform = "scale(" + this.buttonScale + ")"
-
-        // if (this.closeBtn)
-        //     this.closeBtn.style.transform = "scale(" + this.buttonScale + ")"
-
-        console.log(this.buttonScale)
-        //// This did not work with svgs!
         TweenLite.set([this.infoBtn, this.backBtn, this.closeBtn], {
             scale: this.buttonScale
         })
@@ -484,6 +482,7 @@ export class DOMFlippable {
 
     clickInfo() {
         this.bringToFront()
+        console.log("clickInfo")
         this.infoBtn.click()
     }
 
@@ -525,8 +524,6 @@ export class DOMFlippable {
         }
     }
 
-
-
     enable(button) {
         this.show(button, this.fadeDuration)
         if (button) {
@@ -537,7 +534,7 @@ export class DOMFlippable {
     disable(button) {
         this.hide(button, this.fadeDuration)
         if (button) {
-            TweenLite.set(button, { pointerEvents: 'none' })
+           // TweenLite.set(button, { pointerEvents: 'none' })
         }
     }
 
@@ -582,7 +579,6 @@ export class DOMFlippable {
         let x = this.flipped ? xx : this.startX
         let y = this.flipped ? yy : this.startY
 
-        console.log("DOMFlippable.start", this.flipped, targetCenter, x, y, this.saved)
         let onUpdate = this.onUpdate !== null ? () => this.onUpdate(this) : null
         console.log(this.flipDuration)
         TweenLite.to(this.card, this.flipDuration, {

lib/scatter.html

@@ -15,10 +15,10 @@
         context.clearRect(0, 0, debugCanvas.width, debugCanvas.height)
 
         let stage = scatterContainer.polygon
-        stage.draw(context, { stroke: '#FF0000'})
+        stage.draw(context, { stroke: '#0000FF'})
         for(let scatter of scatterContainer.scatter.values()) {
             let polygon = scatter.polygon
-            polygon.draw(context, { stroke: '#FF0000'})
+            polygon.draw(context, { stroke: '#0000FF'})
         }
     }
 
@@ -48,7 +48,7 @@ we describe the more basic DOM scatter.
     <img id="women" draggable="false" style="position: absolute;" src="examples/women.jpeg" />
     <img id="king" draggable="false"  style="position: absolute;" src="examples/king.jpeg" />
 
-    <canvas id="debugCanvas" height="280" style="z-index: 100000; pointer-events: none; position: absolute; border: 1px solid red;">
+    <canvas id="debugCanvas" height="280" style="z-index: 100000; pointer-events: none; position: absolute; border: 1px solid blue;">
         Canvas not supported.
     </canvas>
 </div>
@@ -81,4 +81,39 @@ app.run()
 animatePolygons()
 </script>
 
+<h1>
+	Interactive Content
+</h1>
+<p>
+Scatter objects may contain interactive HTML structures. There is one major flag that allows
+to simulate click events by using taps. If the scatter detects a tap it looks for clickable
+elements under or nearby the event position and calls the click handler. Thus gestures
+can be disambiguated as moves, zooms. or taps.
+</p>
+
+<div id="main2" class="grayBorder interactive" style="position: relative; width: 100%; height: 280px;">
+    <!-- Note that we need to set draggable to false to avoid conflicts. The DOM elements
+    must also be positioned absolutely. -->
+    <div id="interactiveContent">
+        <img draggable="false" style="position: absolute;" src="examples/women.jpeg" />
+        <a style="position:absolute; top: 10px; right: 10px; color:white;" href="https://www.iwm-tuebingen.de" target="_blank">A Link</a>
+        <div onclick="alert('clicked')" style="position:absolute; top: 30px; right: 10px; color:white;">A Div with click handler</div>
+    </div>
+</div>
+
+<script class="doctest">
+  
+    let app2 = new App()
+    let scatterContainer2 = new DOMScatterContainer(main2)
+    let scatter2 = new DOMScatter(interactiveContent, scatterContainer2, {
+                        x: 44,
+                        y: 44,
+                        width: 274,
+                        height: 184,
+                        throwVisibility: 88,
+                        minScale: 0.5,
+                        maxScale: 1.5})
+    app2.run()
+</script>
+
 </body>

lib/scatter.js

@@ -931,7 +931,7 @@ export class DOMScatterContainer {
             context.stroke()
         }
         requestAnimationFrame(dt => {
-            this.showTouches(dt)
+            this.showTouches(dt, canvas)
         })
     }
 
@@ -1043,6 +1043,7 @@ export class DOMScatter extends AbstractScatter {
             height = null,  // required
             resizable = false,
             clickOnTap = false,
+            allowClickDistance = 44,
             verbose = true,
             onResize = null,
             touchAction = 'none',
@@ -1106,7 +1107,8 @@ export class DOMScatter extends AbstractScatter {
             rotation: this.startRotationDegrees,
             transformOrigin: transformOrigin
         }
-
+        this.tapNodes = new Map()
+        this.allowClickDistance = allowClickDistance
 
         // For tweenlite we need initial values in _gsTransform
         TweenLite.set(element, this.initialValues)
@@ -1299,16 +1301,99 @@ export class DOMScatter extends AbstractScatter {
     }
 
     onTap(event, interaction, point) {
+        
         if (this.clickOnTap) {
-            let p = Points.fromPageToNode(this.element, point)
+            let directNode = document.elementFromPoint(point.x, point.y)
-            let element = document.elementFromPoint(p.x, p.y)
+            let nearestNode = this.nearestClickable(event)
-            if (element != null) {
+
-                console.log('tap simulates click')
+            console.log("onTap", directNode, nearestNode.tagName)
-                element.click()
+            if (directNode != null && this.isClickable(directNode)) {
+                directNode.click()
+            }
+            else {
+                if (nearestNode.tagName == 'svg' && this.isClickable(nearestNode)) {
+                    let handler = this.tapNodes.get(nearestNode)
+                    console.log("Clicking beneath SVG: to be done", handler)
+                    Events.stop(event)
+                    //nearestNode.click()
+                }
             }
         }
     }
 
+    /**
+     * Adds a click or tap behavior to the node. Uses
+     * either the scatter clickOnTap version which requires click handlers
+     * or uses the hammer.js driven tap handler.
+     *
+     * @param {*} node
+     * @param {*} handler
+     * @memberof DOMScatter
+     */
+
+    addTapListener(node, handler) {
+        if (this.clickOnTap) {
+            node.addEventListener('click', handler)
+            this.tapNodes.set(node, handler)
+        }
+        else {
+            InteractionMapper.on('tap', node, handler)
+        }
+    }
+
+    isClickable(node) {
+        if (node.tagName == 'A')
+            return true
+        if (this.tapNodes.has(node)) 
+            return true
+        return false
+    }
+
+    /**
+     * Returns an array of all clickable nodes.
+     * Unfortunately we cannot search for all nodes with an attached 'click' event listener
+     * See https://stackoverflow.com/questions/11455515/how-to-check-whether-dynamically-attached-event-listener-exists-or-not
+     * Therefore we can only detect the following standard cases:
+     * I. All clickable objects like clickables
+     * II. Objects that have been attached a click handler by the scatter itself via 
+     */
+    clickableNodes() {
+        let result = []
+        for (let node of this.element.querySelectorAll("*")) {
+            if (this.isClickable(node))
+                result.push(node)
+        }
+        return result
+    }
+
+    nearestClickable(event) {
+        let element = this.element
+        let clickables = this.clickableNodes()
+        let globalClick = (event.center) ? event.center : { x: event.x, y: event.y }
+        let localClick = Points.fromPageToNode(element, globalClick)
+
+        let clickRects = clickables.map(link => {
+            let rect = link.getBoundingClientRect()
+            let topLeft = Points.fromPageToNode(element, rect)
+            let center = Points.fromPageToNode(element, { x: rect.x + rect.width / 2, y: rect.y + rect.height / 2 })
+            return { x: topLeft.x, y: topLeft.y, width: rect.width, height: rect.height, center, link }
+        })
+
+        let distances = []
+        clickRects.forEach(rect => {
+            let distance = Points.distanceToRect(localClick, rect)
+            distances.push(parseInt(distance))
+        })
+
+        let closestClickIndex = distances.indexOf(Math.min(...distances))
+        let closestClickable = clickables[closestClickIndex]
+        if (distances[closestClickIndex] < this.allowClickDistance) {
+            console.log("found closest clickables", closestClickable)
+            return closestClickable
+        }
+        return null
+    }
+
     isDescendant(parent, child) {
         let node = child.parentNode
         while (node != null) {

lib/utils.js

@@ -402,6 +402,13 @@ export class Points {
         return Math.sqrt(dx * dx + dy * dy)
     }
 
+    // Distance == 0.0 indicates an inside relation.
+    static distanceToRect(p, r) {
+        var cx = Math.max(Math.min(p.x, r.x + r.width), r.x)
+        var cy = Math.max(Math.min(p.y, r.y + r.height), r.y)
+        return Math.sqrt((p.x - cx) * (p.x - cx) + (p.y - cy) * (p.y - cy))
+    }
+
     static fromPageToNode(element, p) {
         //    if (window.webkitConvertPointFromPageToNode) {
         //             return window.webkitConvertPointFromPageToNode(element,