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I have a column chart which I am trying to set the vertical axis scale to whole numbers i.e. 0, 1, 2... instead of 0, 0.5, 1...
Using vAxis : {format : '#'} merely rounds up the decimals, leaving duplicates i.e. 0, 1, 1, 2, 2...
Using vAxis : { gridlines : { count : 5 // for example } } does not seem to have an effect.
Ticks look like a solution but my question is what if my chart is to be dynamic? If I don't know what the max number of jobs would be, so as to set the ticks?
The last resort seems to be putting a height constraint on the chart, forcing the v-axis unit to be larger.
Thank you in advance!
to use ticks and still be dynamic,
you can use data table method getComumnRange(columnIndex)
to determine the min and max values of the y-axis values
then use those values to build the ticks array,
see following working snippet...
google.charts.load('current', {
packages:['corechart']
}).then(function () {
var data = google.visualization.arrayToDataTable([
['category', 'value'],
['a', 1],
['b', 10],
['c', 4],
['d', 3],
['e', 7]
]);
var yAxisRange = data.getColumnRange(1);
var ticks = [];
for (var i = 0; i <= yAxisRange.max; i++) {
ticks.push(i);
}
var chart = new google.visualization.ColumnChart(document.getElementById('chart_div'));
chart.draw(data, {
vAxis: {
format: '0',
ticks: ticks
}
});
});
<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="chart_div"></div>
I've this strange behaviour when i make a get request. A query to mysql calls for totals of sells(float) group by days (nvarchar). I've made 2 arrays (for totals and datas) where i push the content of the result
router.get('/movmensili', function(req, res ,next){
if(!req.session.user){
return res.redirect('/');
}
executeQuery("SELECT SUM(price) as Totale, Data FROM db10101.10101 group by Data order
by Data", function(error, resmov){
var dateArray = [];
var totaliArray = [] ;
for (var i = 0; i<resmov.length; i++) {
dateArray.push(resmov[i].Data)
}
for (var i = 0; i<resmov.length; i++) {
totaliArray.push(resmov[i].Totale)
}
res.render('movmensili', {title: 'movs', date: (dateArray), totali: totaliArray
});
});
});
console.log(dateArray); //['2022-05-01','2022-05-02','2022-05-03','2022-05-04','2022-05-05']
console.log(totaliArray); //[ '4.00', '5.50', '3.00', '1.75', null ]
so far so good
once I open my Pug page i got to draw a bar chart with Chart.js
the two arrays used for the chart axes, contains numeric values, no problems for the sell totals, but the xlabels should be strings. So far the xlabes are 2016(=2022 minus 05 minus 01), 2015, 2014 and so on....
canvas#myChart(style='width: 100%; height: 100%; margin: 10 auto')
script.
const xlabels = [#{date}] //[2022-05-01,2022-05-02,2022-05-03,2022-05-04,2022-05-05]
const ydatas = [#{totali}] //[4.00,5.50,3.00,1.75,]
I wasn't able to convert / cast / stringify the x values to get the result needed.
Any suggestions?
David, this worked for me. Are you sure you are passing the labels correctly on render (try date: dateArray instead of date: (dateArray)). I didn't create a render function for this page so hard coded the labels and data arrays:
script.
var labels = ['2022-05-01','2022-05-02','2022-05-03','2022-05-04','2022-05-05',]
var data = {
labels: labels,
datasets: [{
label: 'My First dataset',
backgroundColor: 'rgb(255, 99, 132)',
borderColor: 'rgb(255, 99, 132)',
data: ['4.00', '5.50', '3.00', '1.75', null],
}]
};
var config = {type: 'line',data: data,options: {}};
var myChart = new Chart(document.getElementById("myChart"),config);
Not best solution, but it works....
async function GetData()
var xlabel = '#{date}';
var xlabel = xlabel.replace(/"/g, '"');
alert(xlabel);
var xlabel = xlabel.split(",");
alert(xlabel);
for(i = 0; i < xlabel.length; i += 1){
xlabel[i] = xlabel[i];
//alert(numarray[i]);
xlabels.push(xlabel[i]);
}
if I hardcode the labels in:
const xlabels = [#{date}]
instead of importing from page render, everything works fine. It's exactly that the point. The console.log of dateArray is perfectly as I would like to be in the xlabels, while once imported the quotes disappear
console.log(dateArray); // ['2022-05-01','2022-05-02','2022-05-03','2022-05-04','2022-05-05']
const xlabels = [#{date}]; // [2022-05-01,2022-05-02,2022-05-03,2022-05-04,2022-05-05]
I am calculating Land surface temperature(LST) using Landsat-8 data LANDSAT/LC08/C02/T1_L2 since LANDSAT/LC08/C01/T1_SR has been deprecated. I am following the example here.
I have modified the same code but it is giving different and possibly incorrect results.
// Import country boundaries feature collection.
var dataset = ee.FeatureCollection('USDOS/LSIB_SIMPLE/2017');
// Apply filter where country name equals Uganda.
var geometry = dataset.filter(ee.Filter.eq('country_na', 'Uganda'));
function applyScaleFactors(image) {
var opticalBands = image.select('SR_B.').multiply(0.0000275).add(-0.2);
var thermalBands = image.select('ST_B.*').multiply(0.00341802).add(149.0);
return image.addBands(opticalBands, null, true)
.addBands(thermalBands, null, true);
}
//loading
{
var dataset = ee.ImageCollection("LANDSAT/LC08/C02/T1_L2")
.filterDate('2018-01-01','2018-12-31')
.filterBounds(geometry);
}
//applying scaling factor
dataset = dataset.map(applyScaleFactors);
var image = dataset.median();
var ndvi = image.normalizedDifference(['SR_B5',
'SR_B4']).rename('NDVI');
//selecting thermal band ST_B10
var thermal= image.select('ST_B10');
;
// find the min and max of NDVI
{
var min = ee.Number(ndvi.reduceRegion({
reducer: ee.Reducer.min(),
geometry: geometry,
scale: 30,
maxPixels: 1e9
}).values().get(0));
print(min, 'min');
var max = ee.Number(ndvi.reduceRegion({
reducer: ee.Reducer.max(),
geometry: geometry,
scale: 30,
maxPixels: 1e9
}).values().get(0));
print(max, 'max')
}
//fractional vegetation
var fv =(ndvi.subtract(min).divide(max.subtract(min))).pow(ee.Number(2)).rename('FV');
//Emissivity
var a= ee.Number(0.004);
var b= ee.Number(0.986);
var EM=fv.multiply(a).add(b).rename('EMM');
//LST in Celsius Degree bring -273.15
//NB: In Kelvin don't bring -273.15
var LST = thermal.expression(
'(Tb/(1 + (0.00115* (Tb / 1.438))*log(Ep)))-273.15', {
'Tb': thermal.select('ST_B10'),
'Ep': EM.select('EMM')
}).rename('LST');
Map.addLayer(LST, {min: 20.569706944223423, max:29.328077233404645, palette: [
'040274', '040281', '0502a3', '0502b8', '0502ce', '0502e6',
'0602ff', '235cb1', '307ef3', '269db1', '30c8e2', '32d3ef',
'3be285', '3ff38f', '86e26f', '3ae237', 'b5e22e', 'd6e21f',
'fff705', 'ffd611', 'ffb613', 'ff8b13', 'ff6e08', 'ff500d',
'ff0000', 'de0101', 'c21301', 'a71001', '911003'
]},'LST');
Result using collection1, which seems accurate,
Result using collection2 which seems incorrect,
As I understand it, collection 2 landsat has already been preprocessed so B10 is already converted into thermal. All that needs to be done is to use the following multipliers to convert it into Kelvin. Someone correct me if this is wrong?
var thermalBands = image.select('ST_B.*').multiply(0.00341802).add(149.0);
I have a requirement to render a set of time series data of contiguous blocks.
I need to describe a series of bars which could span many hours, or just minutes, with their own Y value.
I'm not sure if ChartJS is what I should be using for this, but I have looked at extending the Bar type, but it seems very hard coded for each bar to be the same width. The Scale Class internally is used for labels, chart width etc, not just the bars themselves.
I am trying to achieve something like this that works in Excel: http://peltiertech.com/variable-width-column-charts/
Has anyone else had to come up with something similar?
I found I needed to do this and the answer by #potatopeelings was great, but out of date for version 2 of Chartjs. I did something similar by creating my own controller/chart type via extending bar:
//controller.barw.js
module.exports = function(Chart) {
var helpers = Chart.helpers;
Chart.defaults.barw = {
hover: {
mode: 'label'
},
scales: {
xAxes: [{
type: 'category',
// Specific to Bar Controller
categoryPercentage: 0.8,
barPercentage: 0.9,
// grid line settings
gridLines: {
offsetGridLines: true
}
}],
yAxes: [{
type: 'linear'
}]
}
};
Chart.controllers.barw = Chart.controllers.bar.extend({
/**
* #private
*/
getRuler: function() {
var me = this;
var scale = me.getIndexScale();
var options = scale.options;
var stackCount = me.getStackCount();
var fullSize = scale.isHorizontal()? scale.width : scale.height;
var tickSize = fullSize / scale.ticks.length;
var categorySize = tickSize * options.categoryPercentage;
var fullBarSize = categorySize / stackCount;
var barSize = fullBarSize * options.barPercentage;
barSize = Math.min(
helpers.getValueOrDefault(options.barThickness, barSize),
helpers.getValueOrDefault(options.maxBarThickness, Infinity));
return {
fullSize: fullSize,
stackCount: stackCount,
tickSize: tickSize,
categorySize: categorySize,
categorySpacing: tickSize - categorySize,
fullBarSize: fullBarSize,
barSize: barSize,
barSpacing: fullBarSize - barSize,
scale: scale
};
},
/**
* #private
*/
calculateBarIndexPixels: function(datasetIndex, index, ruler) {
var me = this;
var scale = ruler.scale;
var options = scale.options;
var isCombo = me.chart.isCombo;
var stackIndex = me.getStackIndex(datasetIndex);
var base = scale.getPixelForValue(null, index, datasetIndex, isCombo);
var size = ruler.barSize;
var dataset = me.chart.data.datasets[datasetIndex];
if(dataset.weights) {
var total = dataset.weights.reduce((m, x) => m + x, 0);
var perc = dataset.weights[index] / total;
var offset = 0;
for(var i = 0; i < index; i++) {
offset += dataset.weights[i] / total;
}
var pixelOffset = Math.round(ruler.fullSize * offset);
var base = scale.isHorizontal() ? scale.left : scale.top;
base += pixelOffset;
size = Math.round(ruler.fullSize * perc);
size -= ruler.categorySpacing;
size -= ruler.barSpacing;
}
base -= isCombo? ruler.tickSize / 2 : 0;
base += ruler.fullBarSize * stackIndex;
base += ruler.categorySpacing / 2;
base += ruler.barSpacing / 2;
return {
size: size,
base: base,
head: base + size,
center: base + size / 2
};
},
});
};
Then you need to add it to your chartjs instance like this:
import Chart from 'chart.js'
import barw from 'controller.barw'
barw(Chart); //add plugin to chartjs
and finally, similar to the other answer, the weights of the bar widths need to be added to the data set:
var data = {
labels: ['A', 'B', 'C', 'D', 'E', 'F', 'G'],
datasets: [
{
label: "My First dataset",
fillColor: "rgba(220,220,220,0.5)",
strokeColor: "rgba(220,220,220,0.8)",
highlightFill: "rgba(220,220,220,0.7)",
highlightStroke: "rgba(220,220,220,1)",
data: [65, 59, 80, 30, 56, 65, 40],
weights: [1, 0.9, 1, 2, 1, 4, 0.3]
},
]
};
This will hopefully get someone onto the right track. What I have certainly isn't perfect, but if you make sure you have the right number of weight to data points, you should be right.
Best of luck.
This is based on the #Shane's code, I just posted to help, since is a common question.
calculateBarIndexPixels: function (datasetIndex, index, ruler) {
const options = ruler.scale.options;
const range = options.barThickness === 'flex' ? computeFlexCategoryTraits(index, ruler, options) : computeFitCategoryTraits(index, ruler, options);
const barSize = range.chunk;
const stackIndex = this.getStackIndex(datasetIndex, this.getMeta().stack);
let center = range.start + range.chunk * stackIndex + range.chunk / 2;
let size = range.chunk * range.ratio;
let start = range.start;
const dataset = this.chart.data.datasets[datasetIndex];
if (dataset.weights) {
//the max weight should be one
size = barSize * dataset.weights[index];
const meta = this.chart.controller.getDatasetMeta(0);
const lastModel = index > 0 ? meta.data[index - 1]._model : null;
//last column takes the full bar
if (lastModel) {
//start could be last center plus half of last column width
start = lastModel.x + lastModel.width / 2;
}
center = start + size * stackIndex + size / 2;
}
return {
size: size,
base: center - size / 2,
head: center + size / 2,
center: center
};
}
For Chart.js you can create a new extension based on the bar class to do this. It's a bit involved though - however most of it is a copy paste of the bar type library code
Chart.types.Bar.extend({
name: "BarAlt",
// all blocks that don't have a comment are a direct copy paste of the Chart.js library code
initialize: function (data) {
// the sum of all widths
var widthSum = data.datasets[0].data2.reduce(function (a, b) { return a + b }, 0);
// cumulative sum of all preceding widths
var cumulativeSum = [ 0 ];
data.datasets[0].data2.forEach(function (e, i, arr) {
cumulativeSum.push(cumulativeSum[i] + e);
})
var options = this.options;
// completely rewrite this class to calculate the x position and bar width's based on data2
this.ScaleClass = Chart.Scale.extend({
offsetGridLines: true,
calculateBarX: function (barIndex) {
var xSpan = this.width - this.xScalePaddingLeft;
var x = this.xScalePaddingLeft + (cumulativeSum[barIndex] / widthSum * xSpan) - this.calculateBarWidth(barIndex) / 2;
return x + this.calculateBarWidth(barIndex);
},
calculateBarWidth: function (index) {
var xSpan = this.width - this.xScalePaddingLeft;
return (xSpan * data.datasets[0].data2[index] / widthSum);
}
});
this.datasets = [];
if (this.options.showTooltips) {
Chart.helpers.bindEvents(this, this.options.tooltipEvents, function (evt) {
var activeBars = (evt.type !== 'mouseout') ? this.getBarsAtEvent(evt) : [];
this.eachBars(function (bar) {
bar.restore(['fillColor', 'strokeColor']);
});
Chart.helpers.each(activeBars, function (activeBar) {
activeBar.fillColor = activeBar.highlightFill;
activeBar.strokeColor = activeBar.highlightStroke;
});
this.showTooltip(activeBars);
});
}
this.BarClass = Chart.Rectangle.extend({
strokeWidth: this.options.barStrokeWidth,
showStroke: this.options.barShowStroke,
ctx: this.chart.ctx
});
Chart.helpers.each(data.datasets, function (dataset, datasetIndex) {
var datasetObject = {
label: dataset.label || null,
fillColor: dataset.fillColor,
strokeColor: dataset.strokeColor,
bars: []
};
this.datasets.push(datasetObject);
Chart.helpers.each(dataset.data, function (dataPoint, index) {
datasetObject.bars.push(new this.BarClass({
value: dataPoint,
label: data.labels[index],
datasetLabel: dataset.label,
strokeColor: dataset.strokeColor,
fillColor: dataset.fillColor,
highlightFill: dataset.highlightFill || dataset.fillColor,
highlightStroke: dataset.highlightStroke || dataset.strokeColor
}));
}, this);
}, this);
this.buildScale(data.labels);
// remove the labels - they won't be positioned correctly anyway
this.scale.xLabels.forEach(function (e, i, arr) {
arr[i] = '';
})
this.BarClass.prototype.base = this.scale.endPoint;
this.eachBars(function (bar, index, datasetIndex) {
// change the way the x and width functions are called
Chart.helpers.extend(bar, {
width: this.scale.calculateBarWidth(index),
x: this.scale.calculateBarX(index),
y: this.scale.endPoint
});
bar.save();
}, this);
this.render();
},
draw: function (ease) {
var easingDecimal = ease || 1;
this.clear();
var ctx = this.chart.ctx;
this.scale.draw(1);
Chart.helpers.each(this.datasets, function (dataset, datasetIndex) {
Chart.helpers.each(dataset.bars, function (bar, index) {
if (bar.hasValue()) {
bar.base = this.scale.endPoint;
// change the way the x and width functions are called
bar.transition({
x: this.scale.calculateBarX(index),
y: this.scale.calculateY(bar.value),
width: this.scale.calculateBarWidth(index)
}, easingDecimal).draw();
}
}, this);
}, this);
}
});
You pass in the widths like below
var data = {
labels: ['A', 'B', 'C', 'D', 'E', 'F', 'G'],
datasets: [
{
label: "My First dataset",
fillColor: "rgba(220,220,220,0.5)",
strokeColor: "rgba(220,220,220,0.8)",
highlightFill: "rgba(220,220,220,0.7)",
highlightStroke: "rgba(220,220,220,1)",
data: [65, 59, 80, 30, 56, 65, 40],
data2: [10, 20, 30, 20, 10, 40, 10]
},
]
};
and you call it like so
var ctx = document.getElementById('canvas').getContext('2d');
var myLineChart = new Chart(ctx).BarAlt(data);
Fiddle - http://jsfiddle.net/moye0cp4/
I'd like to link this question that doesn't have any answers. Exporting HTML table to PDF with its format with jsPDF. I'm having the same problem with him and the tables looks exactly alike. I have a 20 column html table and I want them to be exported to pdf without any problem. I'm using jsPDF for exporting the table. I have tried the html <colgroup> tag for the column width of my table and it didn't work out. I have the first 8 columns showing and 12 columns hidden. I want all of them to be exported to pdf.
I'd like to try this code but I didn't know how I will execute it using my button in my html.
$(document).on("click", "#btnExportToPDF", function () {
var table1 =
tableToJson($('#table1').get(0)),
cellWidth = 35,
rowCount = 0,
cellContents,
leftMargin = 2,
topMargin = 12,
topMarginTable = 55,
headerRowHeight = 13,
rowHeight = 9,
l = {
orientation: 'l',
unit: 'mm',
format: 'a3',
compress: true,
fontSize: 8,
lineHeight: 1,
autoSize: false,
printHeaders: true
};
var doc = new jsPDF(l, '', '', '');
doc.setProperties({
title: 'Test PDF Document',
subject: 'This is the subject',
author: 'author',
keywords: 'generated, javascript, web 2.0, ajax',
creator: 'author'
});
doc.cellInitialize();
$.each(table1, function (i, row)
{
rowCount++;
$.each(row, function (j, cellContent) {
if (rowCount == 1) {
doc.margins = 1;
doc.setFont("helvetica");
doc.setFontType("bold");
doc.setFontSize(9);
doc.cell(leftMargin, topMargin, cellWidth, headerRowHeight, cellContent, i)
}
else if (rowCount == 2) {
doc.margins = 1;
doc.setFont("times ");
doc.setFontType("italic"); // or for normal font type use ------ doc.setFontType("normal");
doc.setFontSize(8);
doc.cell(leftMargin, topMargin, cellWidth, rowHeight, cellContent, i);
}
else {
doc.margins = 1;
doc.setFont("courier ");
doc.setFontType("bolditalic ");
doc.setFontSize(6.5);
doc.cell(leftMargin, topMargin, cellWidth, rowHeight, cellContent, i); // 1st=left margin 2nd parameter=top margin, 3rd=row cell width 4th=Row height
}
})
})
doc.save('sample Report.pdf'); })
function tableToJson(table) {
var data = [];
// first row needs to be headers
var headers = [];
for (var i=0; i<table.rows[0].cells.length; i++) {
headers[i] = table.rows[0].cells[i].innerHTML.toLowerCase().replace(/ /gi,'');
}
// go through cells
for (var i=1; i<table.rows.length; i++) {
var tableRow = table.rows[i];
var rowData = {};
for (var j=0; j<tableRow.cells.length; j++) {
rowData[ headers[j] ] = tableRow.cells[j].innerHTML;
}
data.push(rowData);
}
return data; }
This is my code btw,
function demoFromHTML() {
$(document).find('tfoot').remove();
$('#table td:nth-child(8)').remove();
var pdf = new jsPDF('p', 'pt', 'letter', true);
// source can be HTML-formatted string, or a reference
// to an actual DOM element from which the text will be scraped.
source = $('#table')[0];
// we support special element handlers. Register them with jQuery-style
// ID selector for either ID or node name. ("#iAmID", "div", "span" etc.)
// There is no support for any other type of selectors
// (class, of compound) at this time.
specialElementHandlers = {
// element with id of "bypass" - jQuery style selector
'#bypassme': function (element, renderer) {
// true = "handled elsewhere, bypass text extraction"
return true
}
};
margins = {
top: 80,
bottom: 60,
left: 55,
width: 522
};
// all coords and widths are in jsPDF instance's declared units
// 'inches' in this case
pdf.fromHTML(
source, // HTML string or DOM elem ref.
margins.left, // x coord
margins.top, { // y coord
'width': margins.width, // max width of content on PDF
'elementHandlers': specialElementHandlers
},
function (dispose) {
// dispose: object with X, Y of the last line add to the PDF
// this allow the insertion of new lines after html
var name = document.getElementById("name").innerHTML;
pdf.save(name);
}, margins);
setTimeout("window.location.reload()",0.0000001);
}
With this code btw, $(document).find('tfoot').remove(); $('#table td:nth-child(8)').remove(); I remove my footer and the 8th column of my table.