Index: trunk/webapps/visualizer/js/vdsLayer.js =================================================================== --- trunk/webapps/visualizer/js/vdsLayer.js (revision 528) +++ trunk/webapps/visualizer/js/vdsLayer.js (revision 530) @@ -1,26 +1,4 @@ - // Build a solid colored icon to use instead of the classic pin - function dotSymbol(color) - { - var iconPath = iconVDSwhite; - if (color == 'red') - { - iconPath = iconVDSred; - } - else if (color == 'yellow') - { - iconPath = iconVDSyellow; - } - else if (color == 'lime') - { - iconPath = iconVDSgreen; - } - return { - url: iconPath, - anchor: new google.maps.Point(6, 6) - }; - } - // Load the map data from a json file and style all the points - function loadVDSlayer() + function initializeVDSlayer() { // Load the static map data and call saveCoords when done @@ -46,4 +24,27 @@ }); } + + // Build a solid colored icon to use instead of the classic pin + function dotSymbol(color) + { + var iconPath = iconVDSwhite; + if (color == 'red') + { + iconPath = iconVDSred; + } + else if (color == 'yellow') + { + iconPath = iconVDSyellow; + } + else if (color == 'lime') + { + iconPath = iconVDSgreen; + } + return { + url: iconPath, + anchor: new google.maps.Point(6, 6) + }; + } + // callback when load GeoJson completes // save each feature's Point as the original coordinates for later reference @@ -56,8 +57,7 @@ vds_coords[feature.getId()] = pt; // save the Point in a dictionary }); - // update the dot colors from the dynamic json data - updateVDSlayer(); // go adjust the marker coordinates so dots don't overlap adjustCoords(calcDistanceFactor()); + processVDS(); } @@ -114,4 +114,110 @@ } + // Load the highways static json file and update the map + function resetVDSlayer() + { + eventIndex = -1; + loadJSON(kMapStartupFile, function(response) + { + // Parse JSON string into object + //initialVDSjson = JSON.parse(response); + // Process each new marker - lookup in current map + var initialVDSjsonFeatures = JSON.parse(response).features + initialVDSjsonFeatures.forEach(updateMarker); + }); + } + + function getColorName(str){ + if (str === "R\r" || str === "R") + return "red"; + else if (str === "Y\r" || str === "Y") + return "yellow"; + else if (str === "G\r" || str === "G") + return "lime"; + } + +// Parses the traffic events file and builds an array of target dots for each line + function processVDS() { + //var parsed_JSON; + loadJSON(kMapStartupFile, function(response) + { + // Parse JSON string into object + parsed_JSON = JSON.parse(response); + // Process each new marker - lookup in current map + var parsed_features = parsed_JSON.features; + parsed_features.forEach(updateMarker); + var eventsFile = ''; + // Request the traffic events data file + var xmlhttp = new XMLHttpRequest(); + xmlhttp.open("GET",trafficEventsFile,true); // Ask the server for the traffic events file + // Establish listener for handling the traffic events once file is read + xmlhttp.onreadystatechange = function() + { + if(xmlhttp.status == 200 && xmlhttp.readyState == 4) + { + eventsFile = xmlhttp.responseText; + // Process the traffic events file + var lines = eventsFile.toString().split("\n"); + // For each line in the events file + for (var line = 1; line < lines.length; line++) + { + var trimmedLine = lines[line].trim(); + if (trimmedLine[0] !== '#') //ignores lines with # + { + var dots = []; + var event = trimmedLine.split(/[ ,]+/); + var start = parseFloat(event[4]); // extract postmile field + var range = parseFloat(event[5]); // extract distance + var newColor = getColorName(event[6]); // extract DotColor + eventTimes.push(event[1]); // extract the event time + // Process each VDS in the highway network + parsed_features.forEach(function (marker) { + var marker_fields = marker.id.split(" "); + // See if this marker's highway and direction match to this event + if (marker_fields[0] === event[2] && marker_fields[1] === event[3]) + { //computes difference in postmiles + var dist = parseFloat(marker_fields[2]) - start; + // If this marker is within computed range + if (dist <= range && dist >= 0) + { + // Add the marker to the dots representing this event + dots.push({"marker": marker, "color": newColor}); + } + } + }); + targetDots.push(dots); // add this events dots to the list of targetdots + } // end if + } // end for + // After the traffic events are processed, go build the differences array + buildDiff(); // side effect: leaves map with last event showing + resetVDSlayer(); // restore the map to initial state + } + }; + xmlhttp.send(); + }); + } + + // Calls updateMarker for all targetDots after storing the previous marker in diff_arr + // This function only needs to be done once, during startup. + function buildDiff() + { + for (var i = 0; i <= targetDots.length; i++) + { + if (targetDots[i] !== undefined) + { + var targetMarkers = new Array(); + targetDots[i].forEach(function(item) + { + item.marker.properties.color = item.color; + storePrev(item.marker, targetMarkers); + updateMarker(item.marker); + }); + diff_arr.push(targetMarkers); + } + } + } + // Helper function for BuildDiff + // Store the previous colors of the targetDots + // so it will available if the user goes "back". function storePrev(marker, targetMarkers) { @@ -129,176 +235,88 @@ } - // Load the highways dynamic json file and update the map - function updateVDSlayer() - { - index = -1; - var parsed_JSON; - loadJSON(kVDSstatusFile, function(response) - { - // Parse JSON string into object - parsed_JSON = JSON.parse(response); - // Process each new marker - lookup in current map - parsed_JSON.features.forEach(updateMarker); - }); - } - - function getColorName(str){ - if (str === "R\r" || str === "R") - return "red"; - else if (str === "Y\r" || str === "Y") - return "yellow"; - else if (str === "G\r" || str === "G") - return "lime"; - } - - function processVDS() { - var parsed_JSON; - loadJSON(kVDSstatusFile, function(response) - { - // Parse JSON string into object - parsed_JSON = JSON.parse(response); - // Process each new marker - lookup in current map - var array = parsed_JSON.features; - var txt = ''; - var xmlhttp = new XMLHttpRequest(); - xmlhttp.onreadystatechange = function(){ - if(xmlhttp.status == 200 && xmlhttp.readyState == 4){ - txt = xmlhttp.responseText; - var lines = txt.toString().split("\n"); - for (var line = 1; line < lines.length; line++) { - filters[line-1] = []; - var event = lines[line].split(/[ ,]+/); - var start = parseFloat(event[4]); // 7.73 - var range = parseFloat(event[5]); // 0.5 - var newColor = getColorName(event[6]); // "R" - times.push(event[1]); - array.forEach(function (marker) { - var id_arr = marker.id.split(" "); - if (id_arr[0] === event[2] && id_arr[1] === event[3]){ - var dist = parseFloat(id_arr[2]) - start; //difference of postmiles - if (dist <= range && dist >= 0){ - filters[line-1].push({"marker": marker, "color": newColor}); - } - } - }); - } - } - }; - xmlhttp.open("GET",trafficEventsFile,true); //read traffic events text file - xmlhttp.send(); - }); - } - - // updates color for each marker based on color in filters array - function updateVDS(forwards) { - if (forwards) { - index++; - if (index >= filters.length) - { - index = filters.length - 1; - } - if (filters[index] !== undefined) { - filters[index].forEach(function(item){ - item.marker.properties.color = item.color; - updateMarker(item.marker); - }); - } - } - else { - if (diff_arr[index] !== undefined) { - diff_arr[index].forEach(function(item){ - updateMarker(item); - }); - } - index--; - if (index < -1) - { - index = -1; - } - } - } - - function buildDiff() - { - for (var i = 0; i <= filters.length; i++) - { - if (filters[i] !== undefined) - { - var targetMarkers = new Array(); - filters[i].forEach(function(item){ - item.marker.properties.color = item.color; - storePrev(item.marker, targetMarkers); - updateMarker(item.marker); - }); - diff_arr.push(targetMarkers); - } - } - } - -function initVDSbutton() -{ - - var vdsBtnDiv = document.getElementById('vdsButton'); - map.controls[google.maps.ControlPosition.LEFT_BOTTOM].push(vdsBtnDiv) - vdsBtnDiv.title = 'Click to toggle vds view'; - - // Setup the click event listeners to toggle icon display - vdsBtnDiv.addEventListener('click', function() - { - vds_showing = !vds_showing; - // reveal or hide all the dots - map.data.forEach(function(feature) - { - map.data.overrideStyle(feature, - { - visible: vds_showing + + + // Increments the eventIndex from and updates all the targetDots on map + function updateForwards() { + eventIndex++; + // limit eventIndex to length of targetDots + if (eventIndex >= targetDots.length) + { + eventIndex = targetDots.length - 1; + } + // update all the target dots + if (targetDots[eventIndex] !== undefined) { + targetDots[eventIndex].forEach(function(item){ + item.marker.properties.color = item.color; + updateMarker(item.marker); }); - }); - // Determine which button image to show - if (vds_showing) - { - pic = "images/btnDepressed_VDS.png" - } - else - { - pic = "images/btnReady_VDS.png" - } - document.getElementById('vdsBtnImg').src = pic; - }); -} - -// init beginning and next buttons as well as time display on map -function initForwardbutton() + } + } + + // Decrements the eventIndex and updates all the targetDots from diff_arr on map + function updateBackwards() { + //update each target dot in order to revert to previous color + if (diff_arr[eventIndex] !== undefined) { + diff_arr[eventIndex].forEach(function(item){ + updateMarker(item); + }); + } + eventIndex--; + // restrict eventIndex to -1 + if (eventIndex < -1) + { + eventIndex = -1; + } + } + + +// init beginning, forward and back buttons as well as time display on map +function initControlButtons() { var i = 0; + // setup the time display var time = document.getElementById('time'); map.controls[google.maps.ControlPosition.BOTTOM_CENTER].push(time) - var start = document.getElementById('start'); - map.controls[google.maps.ControlPosition.BOTTOM_CENTER].push(start) - start.title = 'Click to see the first event'; + // set up the "beginning" button + var beginning = document.getElementById('beginning'); + map.controls[google.maps.ControlPosition.BOTTOM_CENTER].push(beginning) + beginning.title = 'Click to see the first event'; + // set up the "next" button var forward = document.getElementById('forward'); map.controls[google.maps.ControlPosition.BOTTOM_CENTER].push(forward) + // set up the "back" button var backward = document.getElementById('backward'); map.controls[google.maps.ControlPosition.BOTTOM_CENTER].push(backward) forward.title = 'Click to see the next event'; - //console.log(diff_arr); + //console.log(targetDots, eventTimes); + // Establish the listeners for each button forward.addEventListener('click', function() { - updateVDS(1); - if (i < times.length - 1) + updateForwards(); + backward.disabled = false; + if (i < eventTimes.length - 1) // get the next eventTime { ++i; - time.innerHTML = times[i]; + time.innerHTML = eventTimes[i]; + } + if (eventIndex === targetDots.length - 1) // disable next button if last event reached + { + forward.disabled = true; } }); backward.addEventListener('click', function() { - updateVDS(0); - if (i > 0) + updateBackwards(); + forward.disabled = false; + if (i > 0) // get the prev eventTime { --i; - time.innerHTML = times[i]; + time.innerHTML = eventTimes[i]; + } + if (eventIndex < 0) // disable back button if at first event + { + backward.disabled = true; } }); - start.addEventListener('click', function() { - updateVDSlayer(); + beginning.addEventListener('click', function() { + resetVDSlayer(); // redraw markers on map from startup file i = 0; time.innerHTML = "00:00:00";