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Merge pull request #23 from benjaminluck/dev/new
Finished scrolling mechanism detection.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,280 @@ | ||
| var ScrollingController = (function () { | ||
| var self = {}; | ||
| // idle, playing, muted | ||
| self.applySmoothScrolling = false; | ||
| self.scrollingCurrentSpeed = 0; | ||
| self.scrollingLeftSpeed = 0; | ||
| self.scrollingRightSpeed = 0; | ||
| self.scrollingProgress = 0; // float bewteen 0 <-> 1 | ||
|
|
||
| self.scrollingIncrement = 0.03; | ||
| self.dampingFactor = self.scrollingIncrement * 1; | ||
| self.scrollingStartSpeed = 0.01; | ||
| self.scrollingCap = 0.02; | ||
| self.scrollDuration = 100; //in ms | ||
| self.scrollStartTime = {}; | ||
| self.scrollTimeLeft = 0; | ||
| self.scrollEndTime; | ||
| self.isScrolling = false; | ||
| self.isStopping = false; | ||
|
|
||
| self.scrollingCooldown = 25; // period (in ms) AFTER scroll when wheel events will be ignored | ||
| self.scrollingCooldownStart; // timestamp when cooldown started | ||
| self.scrollingThreshold = 155; | ||
|
|
||
| self.scrollingTypeCheck = { | ||
| status: 0, | ||
| startTime : 0, | ||
| endTime : 0, | ||
| duration: 200, | ||
| eventTimestamps: [], | ||
| numEvents: 0, | ||
| maxResults: 50, | ||
| checkResults: [] | ||
| }; | ||
|
|
||
| self.determinedScrollingMechanism = 'continous'; // default stepping | ||
|
|
||
| self.scrollingMechanismReads = { | ||
| data: {}, | ||
| minPercentage: 0.6, | ||
| minReads: 15, | ||
| countMemory: 50, | ||
| init: function(){ | ||
| standard = { | ||
| total: 0, | ||
| history: { | ||
| "stepper": { | ||
| count: 0, | ||
| percentage: 0 | ||
| }, | ||
| "continous": { | ||
| count: 0, | ||
| percentage: 0 | ||
| } | ||
| } | ||
| } | ||
| return standard; | ||
| } | ||
| }; | ||
|
|
||
| self.scrollingMechanismReads.data = self.scrollingMechanismReads.init(); | ||
|
|
||
| self.determineScrollType = function(){ | ||
| self.scrollingMechanismReads; | ||
| if(self.scrollingMechanismReads){ | ||
| if(self.scrollingMechanismReads.data && self.scrollingMechanismReads.data.history){ | ||
| for(key in self.scrollingMechanismReads.data.history){ | ||
| if(self.scrollingMechanismReads.data.history[key].count > self.scrollingMechanismReads.minReads){ | ||
| if(self.scrollingMechanismReads.data.history[key].percentage > self.scrollingMechanismReads.minPercentage){ | ||
| self.determinedScrollingMechanism = key; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| switch(self.determinedScrollingMechanism){ | ||
| case 'continous': | ||
| self.applySmoothScrolling = false; | ||
| break; | ||
| case 'stepper': | ||
| self.applySmoothScrolling = true; | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| self.readScrollingType = function(){ | ||
| if(self.scrollingTypeCheck.checkResults){ | ||
| var arrLength = self.scrollingTypeCheck.checkResults.length; | ||
| var targetResult = self.scrollingTypeCheck.checkResults[arrLength - 1]; | ||
| } | ||
|
|
||
| if(targetResult){ | ||
|
|
||
| if(targetResult.timeDeltaAvg < 20){ | ||
| self.scrollingMechanismReads.data.total++; | ||
| var determinedMechanism = 'continous'; | ||
| } | ||
|
|
||
| if(targetResult.timeDeltaAvg > 20){ | ||
| self.scrollingMechanismReads.data.total++; | ||
| var determinedMechanism = 'stepper'; | ||
| } | ||
|
|
||
| self.determinedScrollingMechanism = determinedMechanism | ||
| self.scrollingMechanismReads.data.history[determinedMechanism].count++; | ||
| self.scrollingMechanismReads.data.history[determinedMechanism].percentage = self.scrollingMechanismReads.data.history[determinedMechanism].count / self.scrollingMechanismReads.data.total; | ||
| self.applySmoothScrolling = false; | ||
| } | ||
|
|
||
| if(self.scrollingMechanismReads.data.total > self.scrollingMechanismReads.countMemory){ | ||
| self.scrollingMechanismReads.data = self.scrollingMechanismReads.init(); | ||
| } | ||
| } | ||
|
|
||
| self.runScrollingTypeCheck = function(){ | ||
| var currentTime = new Date().getTime(); | ||
| function init(status){ | ||
| self.scrollingTypeCheck.status = status; | ||
| self.scrollingTypeCheck.startTime = currentTime; | ||
| self.scrollingTypeCheck.endTime = self.scrollingTypeCheck.startTime + self.scrollingTypeCheck.duration; | ||
| self.scrollingTypeCheck.numEvents = 0; | ||
| self.scrollingTypeCheck.eventTimestamps = []; | ||
| } | ||
|
|
||
| if(self.scrollingTypeCheck.status == 0){ | ||
| init(1); | ||
| } | ||
|
|
||
| // on running | ||
| if(self.scrollingTypeCheck.status == 1){ | ||
| self.scrollingTypeCheck.numEvents++; | ||
| self.scrollingTypeCheck.eventTimestamps.push(currentTime); | ||
| } | ||
|
|
||
| // on end | ||
| if(self.scrollingTypeCheck.status == 1 && currentTime > self.scrollingTypeCheck.endTime){ | ||
| var avg = self.scrollingTypeCheck.eventTimestamps.reduce(function(acc, element, index, array) { | ||
| acc.current = array[index -1]; | ||
| acc.current = element - acc.current; | ||
|
|
||
| if(!acc.current.isNan){ | ||
| acc.timeDeltas.push(acc.current); | ||
| } | ||
| var sum = 0; | ||
| for(i = 0 ; i < acc.timeDeltas.length; i++){ | ||
| if(!isNaN(acc.timeDeltas[i]) ){ | ||
| sum = sum + acc.timeDeltas[i]; | ||
| } | ||
| } | ||
|
|
||
| var avg = sum / array.length; | ||
| if(index == array.length -1){ | ||
| return avg; | ||
| } | ||
|
|
||
| return acc; | ||
| }, {timeDeltas:[], current: self.scrollingTypeCheck.eventTimestamps[0]}); | ||
|
|
||
| self.scrollingTypeCheck.checkResults.push({timestamp: self.scrollingTypeCheck.startTime, count: self.scrollingTypeCheck.numEvents, timeDeltaAvg: avg}); | ||
| if(self.scrollingTypeCheck.checkResults.length > self.scrollingTypeCheck.maxResults){ | ||
| self.scrollingTypeCheck.checkResults = []; | ||
| } | ||
|
|
||
| init(0); | ||
| } | ||
|
|
||
| self.readScrollingType(); | ||
| self.determineScrollType(); | ||
| } | ||
| // on scroll up/down event: | ||
| // 1) scroll left speed increases (if event.deltaY < 0) | ||
| // 1) scroll right speed increases (if event.deltaY > 0) | ||
| // every frame the scroll speed decreases so that after {{scrollDuration}} the speed is 0 | ||
|
|
||
|
|
||
| self.determineTargetDirection = function(event){ | ||
| if(event.deltaY < 0){ | ||
| self.scrollingTargetDirection = -1; | ||
| if(self.scrollingLeftSpeed < self.scrollingCap){ | ||
| self.scrollingLeftSpeed = self.scrollingLeftSpeed + (self.scrollingIncrement); | ||
| // self.scrollingLeftSpeed = self.scrollingIncrement * (1 - self.scrollingProgress); | ||
| } | ||
| } | ||
| if(event.deltaY > 0){ | ||
| self.scrollingTargetDirection = 1; | ||
| if(self.scrollingRightSpeed < self.scrollingCap){ | ||
| self.scrollingRightSpeed = self.scrollingRightSpeed + (self.scrollingIncrement); | ||
| // self.scrollingRightSpeed = self.scrollingIncrement * (1 - self.scrollingProgress); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| self.updateProgress = function(){ | ||
| if(self.isScrolling){ | ||
| var currentTime = new Date().getTime(); | ||
| self.scrollingProgress = (currentTime - self.scrollStartTime) / self.scrollDuration; | ||
| } | ||
| if(self.scrollingProgress > 1){ | ||
| self.scrollingProgress = 1; | ||
| } | ||
| } | ||
|
|
||
| self.handleEvent = function(event){ | ||
| var currentTime = new Date().getTime(); | ||
| var wheelDelta = event.deltaY; | ||
| if(wheelDelta < 0){ | ||
| wheelDelta = wheelDelta * -1; | ||
| } | ||
|
|
||
|
|
||
| if(currentTime < (self.scrollingCooldownStart + self.scrollingCooldown)){ | ||
| self.scrollingCooldownStart = currentTime; | ||
| if(wheelDelta < self.scrollingThreshold){ | ||
| return false; | ||
| } | ||
| //return false; | ||
| } | ||
|
|
||
|
|
||
| self.determineTargetDirection(event); | ||
|
|
||
| if(!self.isScrolling){ | ||
| self.scrollStartTime = new Date().getTime(); | ||
| self.scrollingProgress = 0; | ||
| self.scrollEndTime = self.scrollStartTime + self.scrollDuration; | ||
| self.scrollingCurrentSpeed = self.scrollingStartSpeed; | ||
| self.isScrolling = true; | ||
| self.scrollingCooldownStart = new Date().getTime(); | ||
| }else{ | ||
| // if already scrolling: | ||
| } | ||
| } | ||
|
|
||
| self.updateSpeed = function(){ | ||
| self.scrollingCurrentSpeed = (self.scrollingLeftSpeed * -1) + self.scrollingRightSpeed; | ||
| self.scrollingCurrentSpeed = self.scrollingCurrentSpeed * (1 - self.scrollingProgress); | ||
| } | ||
|
|
||
| self.applyDamping = function(){ | ||
|
|
||
| if(self.scrollingLeftSpeed > 0){ | ||
| self.scrollingLeftSpeed = self.scrollingLeftSpeed - (self.dampingFactor); | ||
| }else{ | ||
| self.scrollingLeftSpeed = 0; | ||
| } | ||
| if(self.scrollingRightSpeed > 0){ | ||
| self.scrollingRightSpeed = self.scrollingRightSpeed - (self.dampingFactor); | ||
| }else{ | ||
| self.scrollingRightSpeed = 0; | ||
| } | ||
|
|
||
| if(self.scrollingCurrentSpeed < 0){ | ||
| self.scrollingActualDirection = 0; | ||
| self.scrollingTargetDirection = 0; | ||
| } | ||
| } | ||
|
|
||
| self.updateTimeElapsed = function(){ | ||
| if(self.isScrolling){ | ||
| self.scrollTimeLeft = self.scrollEndTime - new Date().getTime(); | ||
| if(self.scrollStartTime < (new Date().getTime() - self.scrollDuration)){ | ||
| self.applyDamping(); | ||
| self.isScrolling = false; | ||
|
|
||
| } | ||
| } | ||
| } | ||
|
|
||
| self.applyScrollRotation = function(){ | ||
| if(self.applySmoothScrolling){ | ||
| self.updateTimeElapsed(); | ||
| window.controls.rotate(self.scrollingCurrentSpeed); | ||
| self.updateSpeed(); | ||
| self.updateProgress(); | ||
| } | ||
| } | ||
|
|
||
| return self; | ||
| }()); |
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