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sankey.js
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sankey.js
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var svg;
const width = document.getElementById("sankey-display").offsetWidth,
height = document.getElementById("sankey-display").offsetHeight;
const baseSize = 100;
var nodes;
var nodeHandles;
var links;
var outputs;
var inputs;
var difference;
var sankeyIsMade = false;
var editingMode = false;
var numberOfInputs;
var numberOfOutputs;
var totalNumberOfInputsAndOutputs = 0;
var increaseOfInputsOrOutputs = false;
var lastLength = 0;
var isNodeHandleDeleted = false;
var sequence;
var columns = 0;
var decimalPlaces = 0;
var mydragg = function(){
return {
move : function(divid,xpos,ypos){
divid.style.left = xpos + 'px';
divid.style.top = ypos + 'px';
},
startMoving : function(divid,container,evt){
evt = evt || window.event;
var posX = evt.clientX,
posY = evt.clientY,
divTop = divid.style.top,
divLeft = divid.style.left,
eWi = parseFloat(divid.style.width),
eHe = parseFloat(divid.style.height),
cWi = parseFloat(document.getElementById(container).style.width),
cHe = parseFloat(document.getElementById(container).style.height);
document.getElementById(container).style.cursor='move';
divTop = divTop.replace('px','');
divLeft = divLeft.replace('px','');
var diffX = posX - divLeft,
diffY = posY - divTop;
document.onmousemove = function(evt){
evt = evt || window.event;
var posX = evt.clientX,
posY = evt.clientY,
aX = posX - diffX,
aY = posY - diffY;
if (aX < 0) aX = 0;
if (aY < 0) aY = 0;
if (aX + eWi > cWi) aX = cWi - eWi;
if (aY + eHe > cHe) aY = cHe -eHe;
mydragg.move(divid,aX,aY);
}
},
stopMoving : function(container){
document.getElementById(container).style.cursor='default';
document.onmousemove = function(){}
}
}
}();
var eventX;
var eventY;
var imageCount = 0;
var fileStorage = [];
var order = [];
function handleFileSelect(evt){
evt.stopPropagation();
evt.preventDefault();
var files = null;
var isBtnInput = false;
if(evt.dataTransfer != null) {
files = evt.dataTransfer.files; // FileList object.
}
else{
files = evt.target.files;
isBtnInput = true;
}
// files is a FileList of File objects. List some properties.
for (var i = 0, f; f = files[i]; i++) {
fileStorage[fileStorage.length] = files[i];
order[order.length] = imageCount;
// Only process image files.
if (!f.type.match('image.*')) {
continue;
}
var reader = new FileReader();
// Closure to capture the file information.
reader.onload = (function(theFile) {
return function(e) {
var imageContainer = document.createElement('div');
imageContainer.id = 'imageContainer' + imageCount;
imageContainer.className += "imageContainer";
if(isBtnInput){
imageContainer.style.left = "0px";
imageContainer.style.top = "0px";
}
else{
imageContainer.style.left = (eventX - 50) + "px";
imageContainer.style.top = (eventY - 50) + "px";
}
imageContainer.style.width = "100px";
imageContainer.style.height = "100px";
imageContainer.onmousedown = function(){mydragg.startMoving(imageContainer,'sankey-display',event)};
imageContainer.onmouseup = function(){mydragg.stopMoving('sankey-display')};
imageContainer.style.zIndex = imageCount;
var image = document.createElement("img");
imageContainer.appendChild(image);
image.src = e.target.result;
image.id = "image" + imageCount;
image.style.width = "100%";
image.style.height = "100%";
image.ondragstart = function() { return false; };
document.getElementById("banner").onmouseover = function(){mydragg.stopMoving('sankey-display')};
//document.getElementById("sankey-create").onmouseover = function(){mydragg.stopMoving('sankey-display')};
var resizer = document.createElement('div');
resizer.className = 'resizer';
resizer.style.backgroundColor = "#34ff00";
resizer.style.width = "10px";
resizer.style.height = "10px";
resizer.style.right = "0px";
resizer.style.bottom = "0px";
resizer.style.cursor = "se-resize";
resizer.style.position = "absolute";
resizer.style.display = "none";
imageContainer.appendChild(resizer);
imageContainer.onmouseover = function(){
imageContainer.addEventListener('mouseover', function init() {
imageContainer.removeEventListener('mouseover', init, false);
imageContainer.className = imageContainer.className + ' resizable';
resizer.style.display = null;
resizer.onmousedown = function(e){
imageContainer.onmousedown = function(){};
imageContainer.onmouseup = function(){};
initDrag(e, imageContainer)
};
resizer.onmouseup = function(){
imageContainer.onmousedown = function(){mydragg.startMoving(imageContainer,'sankey-display',event)};
imageContainer.onmouseup = function(){mydragg.stopMoving('sankey-display')};
};
}, false);
};
imageContainer.onmouseout = function(){
resizer.style.display = "none";
};
document.getElementById("sankey-display").appendChild(imageContainer);
var span = document.createElement('span');
span.id = "thumb"+imageCount;
span.className = "image-span";
span.innerHTML = [ '<span class="glyphicon glyphicon-arrow-up" style="font-size: 25px; color: #ff7226; cursor: pointer;" onclick="moveUpImage(' + imageCount + ')"></span>' +
'<span class="glyphicon glyphicon-arrow-down" style="font-size: 25px; padding-right: 10px; color: #ff7226; cursor: pointer;" onclick="moveDownImage(' + imageCount + ')"></span>' +
'' +
'<img class="thumb" src="', e.target.result,
'" title="', escape(theFile.name), '"/><button class="btn btn-secondary btn-pop" title="edit" onclick="removeImage(' + imageCount + ');" style="background-color: #d4161c;"><i class="glyphicon glyphicon-minus"></i></button><br>'].join('');
document.getElementById('list').insertBefore(span, document.getElementById('list').firstChild);
imageCount++;
};
})(f);
// Read in the image file as a data URL.
reader.readAsDataURL(f);
}
document.getElementById('sankey-display').addEventListener('change', handleFileSelect, false);
if(isBtnInput){
document.getElementById('selectImageInput').value = "";
}
}
function moveUpImage(number){
if(document.getElementById("imageContainer" + number).nextSibling != null) {
$("#thumb" + number).after($(document.getElementById("thumb" + number).previousSibling));
var temp = document.getElementById("imageContainer" + number).style.zIndex;
document.getElementById("imageContainer" + number).style.zIndex = document.getElementById("imageContainer" + number).nextSibling.style.zIndex;
document.getElementById("imageContainer" + number).nextSibling.style.zIndex = temp;
$("#imageContainer" + number).before($(document.getElementById("imageContainer" + number).nextSibling));
}
}
function moveDownImage(number){
if(document.getElementById("imageContainer" + number).previousSibling != null) {
$("#thumb" + number).before($(document.getElementById("thumb" + number).nextSibling));
var temp = document.getElementById("imageContainer" + number).style.zIndex;
document.getElementById("imageContainer" + number).style.zIndex = document.getElementById("imageContainer" + number).previousSibling.style.zIndex;
document.getElementById("imageContainer" + number).previousSibling.style.zIndex = temp;
$("#imageContainer" + number).after($(document.getElementById("imageContainer" + number).previousSibling));
}
}
function moveUpSankey(number){
if(document.getElementById("sankey-svg").nextSibling != null) {
$("#thumb" + number).after($(document.getElementById("thumb" + number).previousSibling));
var temp = document.getElementById("sankey-svg").style.zIndex;
document.getElementById("sankey-svg").style.zIndex = document.getElementById("sankey-svg").nextSibling.style.zIndex;
document.getElementById("sankey-svg").nextSibling.style.zIndex = temp;
$("#sankey-svg").before($(document.getElementById("sankey-svg").nextSibling));
}
}
function moveDownSankey(number){
if(document.getElementById("sankey-svg").previousSibling != null) {
$("#thumb" + number).before($(document.getElementById("thumb" + number).nextSibling));
var temp = document.getElementById("sankey-svg").style.zIndex;
document.getElementById("sankey-svg").style.zIndex = document.getElementById("sankey-svg").previousSibling.style.zIndex;
document.getElementById("sankey-svg").previousSibling.style.zIndex = temp;
$("#sankey-svg").after($(document.getElementById("sankey-svg").previousSibling));
}
}
function removeImage(number){
$("#image" + number).remove();
$("#imageContainer"+number).remove();
$("#thumb"+number).remove();
fileStorage.splice(number, 1);
}
function removeThumb(number){
$('#thumb'+number).remove();
}
function handleDragOver(evt) {
evt.stopPropagation();
evt.preventDefault();
evt.dataTransfer.dropEffect = 'copy'; // Explicitly show this is a copy.
}
// Setup the dnd listeners.
// var dropZone = document.getElementById('sankey-display');
// dropZone.addEventListener('dragover', handleDragOver, false);
// dropZone.addEventListener('drop', handleFileSelect, false);
var inputBtn = document.getElementById('selectImageInput');
inputBtn.onclick = addEventListener('change', handleFileSelect, false);
inputBtn.onchange = addEventListener('change', handleFileSelect, false);
var startX, startY, startWidth, startHeight;
var element;
function initDrag(e, elem) {
element = elem;
startX = e.clientX;
startY = e.clientY;
startWidth = parseFloat(document.defaultView.getComputedStyle(element).width, 10);
startHeight = parseFloat(document.defaultView.getComputedStyle(element).height, 10);
document.documentElement.addEventListener('mousemove', doDrag, false);
document.documentElement.addEventListener('mouseup', stopDrag, false);
}
function doDrag(e) {
element.style.left = startX;
element.style.top = startY;
element.style.width = (startWidth + e.clientX - startX) + 'px';
element.style.height = (startHeight + e.clientY - startY) + 'px';
}
function stopDrag(e) {
document.documentElement.removeEventListener('mousemove', doDrag, false); document.documentElement.removeEventListener('mouseup', stopDrag, false);
}
function makeNodes(){
loadSequence();
nodes = [];
//make input node
nodes.push({
name: sequence[0].name,
id: "firstInput",
value: sequence[0].value,
displaySize: baseSize,
width: 300,
x: 150,
y:0,
input: true,
difference: false,
inter: false,
top: false,
units: sequence[0].units,
type: sequence[0].type,
first: true
});
//take all the outputs and make nodes and internodes starting at input and going to output
//Start at 1 for the input that must always come first
for(var i = 1; i < sequence.length; i++) {
if(nodeHandles == null){
if (sequence[i].type === "output") {
//top
//give nodes top based top position of the last nodeHandle output or input
if (i % 2 != 0) {
nodes.push({
name: "inter #" + i,
id: sequence[i].id,
value: 0,
displaySize: 0,
width: 0,
x: 400 + (i - 1) * 230,
y: 0,
input: false,
difference: false,
inter: true,
top: true,
units: sequence[i].units,
type: sequence[i].type,
first: false,
lastY: null
});
nodes.push({
name: sequence[i].name,
id: sequence[i].id,
value: sequence[i].value,
displaySize: 0,
width: 0,
x: 600 + (i - 1) * 230,
y: 0,
input: false,
difference: false,
inter: false,
top: true,
units: sequence[i].units,
type: sequence[i].type,
first: false,
lastY: null
});
}
//bottom
else {
nodes.push({
name: "inter #" + i,
id: sequence[i].id,
value: 0,
displaySize: 0,
width: 0,
x: 450 + (i - 1) * 230,
y: 0,
input: false,
difference: false,
inter: true,
top: false,
units: sequence[i].units,
type: sequence[i].type,
first: false,
lastY: null
});
nodes.push({
name: sequence[i].name,
id: sequence[i].id,
value: sequence[i].value,
displaySize: 0,
width: 0,
x: 650 + (i - 1) * 230,
y: 0,
input: false,
difference: false,
inter: false,
top: false,
units: sequence[i].units,
type: sequence[i].type,
first: false,
lastY: null
});
}
}
else if(sequence[i].type === "input"){
//top
if (i % 2 != 0) {
nodes.push({
name: "inter #" + i,
id: sequence[i].id,
value: 0,
displaySize: 0,
width: 0,
x: 400 + (i - 1) * 230,
y: 0,
input: false,
difference: false,
inter: true,
top: true,
units: sequence[i].units,
type: sequence[i].type,
first: false,
lastY: null
});
nodes.push({
name: sequence[i].name,
id: sequence[i].id,
value: sequence[i].value,
displaySize: 0,
width: 0,
x: 200 + (i - 1) * 230,
y: 0,
input: true,
difference: false,
inter: false,
top: true,
units: sequence[i].units,
type: sequence[i].type,
first: false,
lastY: null
});
}
//bottom
else {
nodes.push({
name: "inter #" + i,
id: sequence[i].id,
value: 0,
displaySize: 0,
width: 0,
x: 450 + (i - 1) * 230,
y: 0,
input: false,
difference: false,
inter: true,
top: false,
units: sequence[i].units,
type: sequence[i].type,
first: false,
lastY: null
});
nodes.push({
name: sequence[i].name,
id: sequence[i].id,
value: sequence[i].value,
displaySize: 0,
width: 0,
x: 250 + (i - 1) * 230,
y: 0,
input: true,
difference: false,
inter: false,
top: false,
units: sequence[i].units,
type: sequence[i].type,
first: false,
lastY: null
});
}
}
}
else{
if (sequence[i].type === "output") {
//top
//give nodes top based top position of the last nodeHandle output or input
if ((i*2 < nodeHandles.length && nodeHandles[i*2].top) || i*2 > nodeHandles.length+1 && !nodes[nodes.length-1].top || ( increaseOfInputsOrOutputs && i*2 == nodeHandles.length && !nodeHandles[nodeHandles.length-2].top)) {
nodes.push({
name: "inter #" + i,
id: sequence[i].id,
value: 0,
displaySize: 0,
width: 0,
x: 400 + (i - 1) * 230,
y: 0,
input: false,
difference: false,
inter: true,
top: true,
units: sequence[i].units,
type: sequence[i].type,
first: false,
lastY: null
});
nodes.push({
name: sequence[i].name,
id: sequence[i].id,
value: sequence[i].value,
displaySize: 0,
width: 0,
x: 600 + (i - 1) * 230,
y: 0,
input: false,
difference: false,
inter: false,
top: true,
units: sequence[i].units,
type: sequence[i].type,
first: false,
lastY: null
});
}
//bottom
else {
nodes.push({
name: "inter #" + i,
id: sequence[i].id,
value: 0,
displaySize: 0,
width: 0,
x: 450 + (i - 1) * 230,
y: 0,
input: false,
difference: false,
inter: true,
top: false,
units: sequence[i].units,
type: sequence[i].type,
first: false,
lastY: null
});
nodes.push({
name: sequence[i].name,
id: sequence[i].id,
value: sequence[i].value,
displaySize: 0,
width: 0,
x: 650 + (i - 1) * 230,
y: 0,
input: false,
difference: false,
inter: false,
top: false,
units: sequence[i].units,
type: sequence[i].type,
first: false,
lastY: null
});
}
}
else if(sequence[i].type === "input"){
//top
if ((i*2 < nodeHandles.length && nodeHandles[i*2].top) || i*2 > nodeHandles.length+1 && !nodes[nodes.length-1].top || ( increaseOfInputsOrOutputs && i*2 == nodeHandles.length&& !nodeHandles[nodeHandles.length-2].top)) {
nodes.push({
name: "inter #" + i,
id: sequence[i].id,
value: 0,
displaySize: 0,
width: 0,
x: 400 + (i - 1) * 230,
y: 0,
input: false,
difference: false,
inter: true,
top: true,
units: sequence[i].units,
type: sequence[i].type,
first: false,
lastY: null
});
nodes.push({
name: sequence[i].name,
id: sequence[i].id,
value: sequence[i].value,
displaySize: 0,
width: 0,
x: 200 + (i - 1) * 230,
y: 0,
input: true,
difference: false,
inter: false,
top: true,
units: sequence[i].units,
type: sequence[i].type,
first: false,
lastY: null
});
}
//bottom
else {
nodes.push({
name: "inter #" + i,
id: sequence[i].id,
value: 0,
displaySize: 0,
width: 0,
x: 450 + (i - 1) * 230,
y: 0,
input: false,
difference: false,
inter: true,
top: false,
units: sequence[i].units,
type: sequence[i].type,
first: false,
lastY: null
});
nodes.push({
name: sequence[i].name,
id: sequence[i].id,
value: sequence[i].value,
displaySize: 0,
width: 0,
x: 250 + (i - 1) * 230,
y: 0,
input: true,
difference: false,
inter: false,
top: false,
units: sequence[i].units,
type: sequence[i].type,
first: false,
lastY: null
});
}
}
}
}
if(!nodes[nodes.length-1].top) {
nodes.push({
name: difference.name,
id: "difference",
value: 0,
displaySize: 0,
width: 0,
x: 400 + i *230,
y: 0,
input: false,
difference: true,
inter: false,
top: true,
units: difference.units,
type: "difference",
first: false,
lastY: null
});
}
else {
nodes.push({
name: difference.name,
id: "difference",
value: 0,
displaySize: 0,
width: 0,
x: 400 + i * 230,
y: 0,
input: false,
difference: true,
inter: false,
top: false,
units: difference.units,
type: "difference",
first: false,
lastY: null
});
}
}
function linkNodes(){
links = [];
if(sequence.length > 1) {
links.push({
source: 0,
target: 1,
endWidth: 0
});
var source = 1;
for (var i = 1; i <= (sequence.length-1); i++) {
//Flip for input
if(sequence[i].type === "input") {
links.push({
source: source + 1,
target: source,
endWidth: 0
});
}
else{
links.push({
source: source,
target: source + 1,
endWidth: 0
});
}
links.push({
source: source,
target: source+2,
endWidth: 0
});
source = source+2;
}
}
else{
links.push({
source: 0,
target: 1,
endWidth: 0
});
}
}
function updateNodeHandles(){
if(nodeHandles.length != 0) {
if(increaseOfInputsOrOutputs){
//save difference node's x and y position
var tmpX = nodeHandles[nodeHandles.length-1].x;
var tmpY = nodeHandles[nodeHandles.length-1].y;
var newNodeCount = 0;
var shitfX = 0;
if(nodeHandles.length > 4){
if(nodes[nodeHandles.length - 5].top){
shitfX = nodeHandles[nodeHandles.length - 3].x - (400 + (((nodeHandles.length - 2)/2) - 1) * 230);
}
else{
shitfX = nodeHandles[nodeHandles.length - 3].x - (450 + (((nodeHandles.length - 2)/2) - 1) * 230);
}
}
else{
if(nodes[nodeHandles.length - 3].top){
shitfX = nodeHandles[nodeHandles.length - 3].x - (400 + (((nodeHandles.length - 2)/2) - 1) * 230);
}
else{
shitfX = nodeHandles[nodeHandles.length - 3].x - (450 + (((nodeHandles.length - 2)/2) - 1) * 230);
}
}
//Remove the last difference node
nodeHandles.pop();
for (var x = lastLength-1; x < nodes.length; x++) {
addNodeHandle(x);
newNodeCount++;
nodeHandles[x].x += shitfX;
}
//Add back in the difference node and apply its previous changes
nodeHandles[nodeHandles.length-1].x = tmpX + 230 * ((newNodeCount-1)/2) + shitfX;
//Shift difference depending on type and if it is top or bottom
if(nodes[nodes.length-2].type === "output"){
if(nodes[nodes.length-2].top){
nodeHandles[nodeHandles.length-1].y = tmpY + nodes[nodes.length-2].displaySize/2;
}
else{
nodeHandles[nodeHandles.length-1].y = tmpY - nodes[nodes.length-2].displaySize/2;
}
}
else{
if(nodes[nodes.length-2].top){
nodeHandles[nodeHandles.length-1].y = tmpY - nodes[nodes.length-2].displaySize/2;
}
else{
nodeHandles[nodeHandles.length-1].y = tmpY + nodes[nodes.length-2].displaySize/2;
}
}
}
else{
for (var x = nodeHandles.length; x < nodes.length; x++) {
addNodeHandle(x);
}
}
}
else{
for (var x = 0; x < nodes.length; x++) {
addNodeHandle(x);
}
}
if(nodeHandles[0].lastValue == nodes[0].value){
//Check to see if any values have changed, and if so shift the nodes
for(var i = 0; i < nodes.length; i++){
if(nodeHandles[i].lastValue != nodes[i].value) {
if (nodeHandles[i].top || isNodeHandleDeleted) {
for (var x = i; x < nodes.length; x++) {
//Shift amount calculated
nodeHandles[x].y += calcDisplayValue(nodeHandles[i].lastValue - nodes[i].value) / 2;
}
}
else {
for (var x = i; x < nodes.length; x++) {
//Shift amount calculated
nodeHandles[x].y -= calcDisplayValue(nodeHandles[i].lastValue - nodes[i].value) / 2;
}
}
break;
}
}
}
else{
//Shift nodes to new size while preserving differences previously made by the users
for(var i = 0; i < nodes.length; i++){
nodeHandles[i].y = nodes[i].y + (nodeHandles[i].y - nodeHandles[i].lastBaseY);
}
}
//Update all changes
for(var i = 0; i < nodes.length; i++){
nodeHandles[i].lastValue = nodes[i].value;
nodeHandles[i].lastDisplaySize = nodes[i].displaySize
}
isNodeHandleDeleted = false;
}
function addNodeHandle(i){
nodeHandles.push({
x: nodes[i].x,
y: nodes[i].y,
top: nodes[i].top,
lastValue: nodes[i].value,
lastDisplaySize: nodes[i].displaySize,
id: nodes[i].id,
lastBaseY: nodes[i].y
});
}
function initDifference(){
difference = {
name: "Difference",
units: ""
};
}
var zoom = d3.zoom()
.on("zoom", zoomed);
var lastTransformX = 1;
var lastTransformY = 1;
var lastTransformK = 1;
function zoomed() {
lastTransformX = d3.event.transform.x;
lastTransformY = d3.event.transform.y;
lastTransformK = d3.event.transform.k;
d3.select('#sankey-svg').select('g').attr('transform', 'translate(' + d3.event.transform.x + ',' + d3.event.transform.y + ') scale(' + d3.event.transform.k + ')');
}
function recenterAndResize(){
d3.select('#sankey-svg').call(zoom.transform, d3.zoomIdentity.scale(1));
lastTransformX = 1;
lastTransformY = 1;
lastTransformK = 1;
}
function makeSankeySVG(location){
//Remove all Sankeys
d3.select(location).selectAll('svg').remove();
lastTransformX = 1;
lastTransformY = 1;
lastTransformK = 1;
svg = d3.select(location).append('svg')
.attr("width", "100%")
.attr("height", "100%")
.attr("preserveAspectRatio", "xMinYMin")
.attr("id", "sankey-svg")
.style("position", "relative")
.style("top", "-34px")
.style("z-index", imageCount)
.call(zoom)
.append("g");
}
function updateSankeySVG(){
if(svg != null){
svg
.call(calcSankey)
.call(findColor);
}
}
function calcSankey() {
var diffrenceValue = parseFloat(nodes[0].value);
nodes[0].y = (400 - nodes[0].displaySize / 2);
nodes.forEach(function (d, i) {
if (d.inter) {
//Reset height
if (i == 1) {
//First interNode
if (nodes[i + 1] != null && nodes[i + 1].type === "input") {
d.value = (parseFloat(nodes[i - 1].value) + parseFloat(nodes[i + 1].value));
d.displaySize = calcDisplayValue(d.value);
}
else {
d.value = nodes[i - 1].value - nodes[i + 1].value;
d.displaySize = calcDisplayValue(d.value);
}
}
else {
if (nodes[i + 1].type === "input") {
d.value = (parseFloat(nodes[i - 2].value) + parseFloat(nodes[i + 1].value));
d.displaySize = calcDisplayValue(d.value);
}
else {
d.value = (parseFloat(nodes[i - 2].value) - parseFloat(nodes[i + 1].value));
d.displaySize = calcDisplayValue(d.value);
}
}
}
else {
if (!d.input) {
if (d.difference) {
//This is where difference is calculated
diffrenceValue = diffrenceValue.toFixed(decimalPlaces);
d.value = diffrenceValue;
d.displaySize = calcDisplayValue(d.value);
document.getElementById("differenceTable").childNodes[3].childNodes[1].value = d.value;
}
else {
if (d.top) {
d.displaySize = calcDisplayValue(d.value);
diffrenceValue -= parseFloat(d.value);
}
else {
d.displaySize = calcDisplayValue(d.value);
diffrenceValue -= parseFloat(d.value);
}
}
}
else {
if (!d.first) {
if (d.top) {
d.displaySize = calcDisplayValue(d.value);
diffrenceValue += parseFloat(d.value);
}
else {
d.displaySize = calcDisplayValue(d.value);
diffrenceValue += parseFloat(d.value);
}
}
}
}
});
nodes.forEach(function (d, i) {
if (d.inter) {
if (i == 1) {
if (nodes[i + 1].type === "input") {
//Adjust if first ist top or bottom
if(nodes[i].top){
d.y = nodes[0].y - nodes[i + 1].displaySize / 2;
}
else{