I want to display X and Y coordinates of a multiple lineseries on hovering any lineseries in qml chartview. The X and Y coordinates displaying should be the plotted values only.
Please go through the attachment.
I came across mapToValue() function of ChartView. But, I did not get how to use it. Could some one please help me on this.
I have implemented a sample code below, but could not able to print the x and y coordinates of each lineseries.
import QtQuick 2.12
import QtQuick.Window 2.12
import QtCharts 2.3
Window {
id: window
visible: true
width: 640
height: 480
title: qsTr("Hello World")
property var x1Val : [0,1,2,3,4,5,6,7,8,9]
property var y1Val : [0,1,2,3,4,5,6,7,8,9]
property var x2Val : [0,1,2,3,4,5,6,7,8,9]
property var y2Val : [1,2,3,4,5,6,7,8,9,10]
property var lineSeries: 0
Component.onCompleted: {
var xVal, yVal
for(let i = 0; i < 2; i++) {
lineSeries = chartView.createSeries(ChartView.SeriesTypeLine, "strend" + i)
lineSeries.hovered.connect(
function(point, state) {
if (state) {
for(let i = 0; i < 2; i++) {
console.log("Name = ", chartView.series(i).name)
//console.log("x = ", point.x + ", y = ", point.y)
//console.log("x = ", chartView.series(i).at(i).x + ", y = ", chartView.series(i).at(i).y)
// How to get x and Y coordinates for each lineseries here ??
}
}
})
lineSeries.axisX.min = 0
lineSeries.axisX.max = 10
lineSeries.axisY.min = 0
lineSeries.axisY.max = 10
lineSeries.pointsVisible = true;
if(i === 0) {
xVal = x1Val
yVal = y1Val
}
else {
xVal = x2Val
yVal = y2Val
}
for(var iLoop = 0; iLoop < x1Val.length; iLoop++) {
lineSeries.append(xVal[iLoop], yVal[iLoop])
}
}
}
ChartView {
id: chartView
anchors.fill: parent
antialiasing: true
legend.visible: true
}
}
I have a Scatter Series with a set of points, like the one shown here. https://developers.google.com/chart/interactive/docs/gallery/scatterchart
The points are grouped and each group is shown in different color. I would like to draw a polygon around each group (convex hull). Looks like there is not a straightforward way to add polygons each with n boundary-points to the chart.
if you have an algorithm to find the boundary points,
you can use a ComboChart to draw both the scatter and line series...
use option seriesType to set the default type
use option series to customize the type for a particular series
in the following working snippet,
the algorithm used was pulled from --> Convex Hull | Set 1 (Jarvis’s Algorithm or Wrapping)
(converted from the Java version)
google.charts.load('current', {
packages: ['corechart']
}).then(function () {
var groupA = [
[0,3],[2,3],[1,1],[2,1],[3,0],[0,0],[3,3],[2,2]
];
var groupB = [
[11,11],[12,12],[12,10],[12,14],[13,13],[14,12],[15,12],[16,12]
];
var data = new google.visualization.DataTable();
data.addColumn('number', 'x');
data.addColumn('number', 'y');
data.addRows(groupA);
data.addRows(groupB);
addGroup('A', data, groupA)
addGroup('B', data, groupB)
var options = {
chartArea: {
bottom: 48,
height: '100%',
left: 36,
right: 24,
top: 36,
width: '100%'
},
height: '100%',
seriesType: 'line',
series: {
0: {
type: 'scatter'
}
},
width: '100%'
};
var chart = new google.visualization.ComboChart(document.getElementById('chart_div'));
drawChart();
window.addEventListener('resize', drawChart, false);
function drawChart() {
chart.draw(data, options);
}
function addGroup(group, dataTable, points) {
var polygon = convexHull(points);
var colIndex = dataTable.addColumn('number', group);
for (var i = 0; i < polygon.length; i++) {
var rowIndex = dataTable.addRow();
dataTable.setValue(rowIndex, 0, polygon[i][0]);
dataTable.setValue(rowIndex, colIndex, polygon[i][1]);
}
}
function orientation(p, q, r) {
var val = (q[1] - p[1]) * (r[0] - q[0]) -
(q[0] - p[0]) * (r[1] - q[1]);
if (val == 0) {
return 0; // collinear
} else if (val > 0) {
return 1; // clock wise
} else {
return 2; // counterclock wise
}
}
function convexHull(points) {
// must be at least 3 rows
if (points.length < 3) {
return;
}
// init
var l = 0;
var p = l;
var q;
var hull = [];
// find leftmost point
for (var i = 1; i < points.length; i++) {
if (points[i][0] < points[l][0]) {
l = i;
}
}
// move counterclockwise until start is reached
do {
// add current point to result
hull.push(points[p]);
// check orientation (p, x, q) of each point
q = (p + 1) % points.length;
for (var i = 0; i < points.length; i++) {
if (orientation(points[p], points[i], points[q]) === 2) {
q = i;
}
}
// set p as q for next iteration
p = q;
} while (p !== l);
// add back first hull point to complete line
hull.push(hull[0]);
// set return value
return hull;
}
});
html, body, #chart_div {
height: 100%;
}
<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="chart_div"></div>
i need help with my Chart.js interactivity. When I click on the label, I need to return the column(index) number at which I clicked.
I tried to use getElementsAtEvent but it only work if I click directly at chart.
This http://jsfiddle.net/yxz2sjam/ is pretty much what I am looking for but getPointsAtEvent is no longer available in the new versions.
canvas.onclick = function (evt) {
var points = chart.getPointsAtEvent(evt);
alert(chart.datasets[0].points.indexOf(points[0]));
};
I also found this http://jsfiddle.net/1Lngmtz7/ but it isn't working with bar chart.
var ctx = document.getElementById("myChart").getContext("2d");
var myRadarChart = new Chart(ctx, {
type: 'radar',
data: data
})
$('#myChart').click(function (e) {
var helpers = Chart.helpers;
var eventPosition = helpers.getRelativePosition(e, myRadarChart.chart);
var mouseX = eventPosition.x;
var mouseY = eventPosition.y;
var activePoints = [];
helpers.each(myRadarChart.scale.ticks, function (label, index) {
for (var i = this.getValueCount() - 1; i >= 0; i--) {
var pointLabelPosition = this.getPointPosition(i, this.getDistanceFromCenterForValue(this.options.reverse ? this.min : this.max) + 5);
var pointLabelFontSize = helpers.getValueOrDefault(this.options.pointLabels.fontSize, Chart.defaults.global.defaultFontSize);
var pointLabeFontStyle = helpers.getValueOrDefault(this.options.pointLabels.fontStyle, Chart.defaults.global.defaultFontStyle);
var pointLabeFontFamily = helpers.getValueOrDefault(this.options.pointLabels.fontFamily, Chart.defaults.global.defaultFontFamily);
var pointLabeFont = helpers.fontString(pointLabelFontSize, pointLabeFontStyle, pointLabeFontFamily);
ctx.font = pointLabeFont;
var labelsCount = this.pointLabels.length,
halfLabelsCount = this.pointLabels.length / 2,
quarterLabelsCount = halfLabelsCount / 2,
upperHalf = (i < quarterLabelsCount || i > labelsCount - quarterLabelsCount),
exactQuarter = (i === quarterLabelsCount || i === labelsCount - quarterLabelsCount);
var width = ctx.measureText(this.pointLabels[i]).width;
var height = pointLabelFontSize;
var x, y;
if (i === 0 || i === halfLabelsCount)
x = pointLabelPosition.x - width / 2;
else if (i < halfLabelsCount)
x = pointLabelPosition.x;
else
x = pointLabelPosition.x - width;
if (exactQuarter)
y = pointLabelPosition.y - height / 2;
else if (upperHalf)
y = pointLabelPosition.y - height;
else
y = pointLabelPosition.y
if ((mouseY >= y && mouseY <= y + height) && (mouseX >= x && mouseX <= x + width))
activePoints.push({ index: i, label: this.pointLabels[i] });
}
}, myRadarChart.scale);
var firstPoint = activePoints[0];
if (firstPoint !== undefined) {
alert(firstPoint.index + ': ' + firstPoint.label);
}
});
Thank for response.
I solve the problem with
document.getElementById("chart").onclick = function(e)
{
var activeElement = weatherMainChart.lastTooltipActive;
console.log(activeElement[0]._index);
};
this solution register clicks on chart and label, then I restricted it with e.layerY to register only clicks on label section.
document.getElementById("chart").onclick = function(e)
{
var activeElement = weatherMainChart.lastTooltipActive;
if(e.layerY > 843 && e.layerY < 866 && activeElement[0] !== undefined)
console.log(activeElement[0]._index);
};
If you add a click handler through the onClick option you can use the following code using the getElementsAtEventForMode() call:
function handleClick(evt) {
var col;
switch(chartType) {
case "horizontalBar":
this.getElementsAtEventForMode(evt, "y", 1).forEach(function(item) { col = item._index });
break;
case "bar":
this.getElementsAtEventForMode(evt, "x", 1).forEach(function(item) { col = item._index });
break;
}
if (!col) {
return;
}
alert("Column " + col + " was selected");
};
You'll probably need to add extra switch checks for other chart types but I'm sure you get the idea.
Using version 2.4.0, i created an onClick Event, and inside it
var activeIndex = localChart.tooltip._lastActive[0]._index;
var clickCoordinates = Chart.helpers.getRelativePosition(e, localChart.chart);
if (clickCoordinates.y >= 530) { //custom value, depends on chart style,size, etc
alert("clicked on " + localChart.data.labels[activeIndex]);
}
I Solved this problem with single or multiple label click you will be find using true/false
First you need to set your chartJs Id click
below code SessionChart = Your ChartJs ID e.g. ("myChart") I was replace it for my Id
document.getElementById("SessionChart").onclick = function (evt) {
var meta = SubscriberSessionChart.getDatasetMeta(0);
if (meta.$filler.chart.legend.legendItems[0].text.toLowerCase() "sessions")
{
if (meta.$filler.chart.legend.legendItems[0].hidden) {
sessionHidden = true;
}
}
}
here "sessions" = first label text
meta.$filler.chart.legend.legendItems[0].text.toLowerCase() = is your first label
from Array so you can get multiple label's click here true / false
if (meta.$filler.chart.legend.legendItems[0].hidden) = your label is not active then
you will get hidden true otherwise you will get false if not tick on label
by default label tick hidden is false in chart js
I am using jsPDF in my site to generate PDFs. But now I have multiple DIVs to print in a single PDF. which may take 2 to 3 pages.
For example:
<div id="part1">
content
</div>
<div id="part2">
content
</div>
<div id="part2">
content
</div>
my JS code
This works but not as I expected, It add a part of the content(which cannot be included in more than one page).
It removes html tags like br, h1 etc.
function formtoPDF() {
jsPDF.API.mymethod = function() {
// 'this' will be ref to internal API object. see jsPDF source
// , so you can refer to built-in methods like so:
// this.line(....)
// this.text(....)
};
var doc = new jsPDF();
doc.mymethod();
var pdfPart1 = jQuery('#genPDFpart1');
var pdfPart2 = jQuery(".ltinerary");
var pdfPart3 = jQuery("#domElementHTML");
var specialElementHandlers = {
'#loadVar': function(element, renderer) {
return true;
}
};
doc.fromHTML(pdfPart1.html() + pdfPart3.html() + pdfPart3.html(), 15, 15, {
'width': 170,
'elementHandlers': specialElementHandlers
});
doc.output('save', 'Download.pdf');
}
What's the solution for this?
I have the same working issue. Searching in MrRio github I found this: https://github.com/MrRio/jsPDF/issues/101
Basically, you have to check the actual page size always before adding new content
doc = new jsPdf();
...
pageHeight= doc.internal.pageSize.height;
// Before adding new content
y = 500 // Height position of new content
if (y >= pageHeight)
{
doc.addPage();
y = 0 // Restart height position
}
doc.text(x, y, "value");
here's an example using html2canvas & jspdf, although how you generate the canvas doesn't matter--we're just going to use the height of that as the breakpoint on a for loop, in which a new page is created and content added to it.
after the for loop, the pdf is saved.
function makePDF() {
var quotes = document.getElementById('container-fluid');
html2canvas(quotes).then((canvas) => {
//! MAKE YOUR PDF
var pdf = new jsPDF('p', 'pt', 'letter');
for (var i = 0; i <= quotes.clientHeight/980; i++) {
//! This is all just html2canvas stuff
var srcImg = canvas;
var sX = 0;
var sY = 980*i; // start 980 pixels down for every new page
var sWidth = 900;
var sHeight = 980;
var dX = 0;
var dY = 0;
var dWidth = 900;
var dHeight = 980;
window.onePageCanvas = document.createElement("canvas");
onePageCanvas.setAttribute('width', 900);
onePageCanvas.setAttribute('height', 980);
var ctx = onePageCanvas.getContext('2d');
// details on this usage of this function:
// https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Using_images#Slicing
ctx.drawImage(srcImg,sX,sY,sWidth,sHeight,dX,dY,dWidth,dHeight);
// document.body.appendChild(canvas);
var canvasDataURL = onePageCanvas.toDataURL("image/png", 1.0);
var width = onePageCanvas.width;
var height = onePageCanvas.clientHeight;
//! If we're on anything other than the first page,
// add another page
if (i > 0) {
pdf.addPage(612, 791); //8.5" x 11" in pts (in*72)
}
//! now we declare that we're working on that page
pdf.setPage(i+1);
//! now we add content to that page!
pdf.addImage(canvasDataURL, 'PNG', 20, 40, (width*.62), (height*.62));
}
//! after the for loop is finished running, we save the pdf.
pdf.save('Test.pdf');
});
}
I found the solution on this page: https://github.com/MrRio/jsPDF/issues/434
From the user: wangzhixuan
I copy the solution here:
// suppose your picture is already in a canvas
var imgData = canvas.toDataURL('image/png');
/*
Here are the numbers (paper width and height) that I found to work.
It still creates a little overlap part between the pages, but good enough for me.
if you can find an official number from jsPDF, use them.
*/
var imgWidth = 210;
var pageHeight = 295;
var imgHeight = canvas.height * imgWidth / canvas.width;
var heightLeft = imgHeight;
var doc = new jsPDF('p', 'mm');
var position = 0;
doc.addImage(imgData, 'PNG', 0, position, imgWidth, imgHeight);
heightLeft -= pageHeight;
while (heightLeft >= 0) {
position = heightLeft - imgHeight;
doc.addPage();
doc.addImage(imgData, 'PNG', 0, position, imgWidth, imgHeight);
heightLeft -= pageHeight;
}
doc.save( 'file.pdf');
var doc = new jsPDF('p', 'mm');
var imgData = canvas.toDataURL('image/png');
var pageHeight= doc.internal.pageSize.getHeight();
var pageWidth= doc.internal.pageSize.getWidth();
var imgheight = $('divName').height() * 25.4 / 96; //px to mm
var pagecount = Math.ceil(imgheight / pageHeight);
/* add initial page */
doc.addPage('l','mm','a4');
doc.addImage(imgData, 'PNG', 2, 0, pageWidth-4, 0);
/* add extra pages if the div size is larger than a a4 size */
if (pagecount > 0) {
var j = 1;
while (j != pagecount) {
doc.addPage('l','mm','a4');
doc.addImage(imgData, 'PNG', 2, -(j * pageHeight), pageWidth-4, 0);
j++;
}
}
You can use html2canvas plugin and jsPDF both. Process order:
html to png & png to pdf
Example code:
jQuery('#part1').html2canvas({
onrendered: function( canvas ) {
var img1 = canvas.toDataURL('image/png');
}
});
jQuery('#part2').html2canvas({
onrendered: function( canvas ) {
var img2 = canvas.toDataURL('image/png');
}
});
jQuery('#part3').html2canvas({
onrendered: function( canvas ) {
var img3 = canvas.toDataURL('image/png');
}
});
var doc = new jsPDF('p', 'mm');
doc.addImage( img1, 'PNG', 0, 0, 210, 297); // A4 sizes
doc.addImage( img2, 'PNG', 0, 90, 210, 297); // img1 and img2 on first page
doc.addPage();
doc.addImage( img3, 'PNG', 0, 0, 210, 297); // img3 on second page
doc.save("file.pdf");
$( document ).ready(function() {
$('#cmd').click(function() {
var options = {
pagesplit: true //include this in your code
};
var pdf = new jsPDF('p', 'pt', 'a4');
pdf.addHTML($("#pdfContent"), 15, 15, options, function() {
pdf.save('Menu.pdf');
});
});
});
This is my first post which support only a single page http://www.techumber.com/html-to-pdf-conversion-using-javascript/
Now, the second one will support the multiple pages.
http://www.techumber.com/how-to-convert-html-to-pdf-using-javascript-multipage/
Below is my code but the problem is that the document doesn't split to display the other part of the document in a new page.
Please improve this code.
<script type='text/javascript'>
$(document).on("click", "#btnExportToPDF", function () {
var table1 =
tableToJson($('#table1')[0]),
cellWidth =42,
rowCount = 0,
cellContents,
leftMargin = 2,
topMargin = 12,
topMarginTable =5,
headerRowHeight = 13,
rowHeight = 12,
l = {
orientation: 'p',
unit: 'mm',
format: 'a3',
compress: true,
fontSize: 11,
lineHeight: 1,
autoSize: false,
printHeaders: true
};
var doc = new jsPDF(l,'pt', 'letter');
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("Times New Roman");
doc.setFontType("bold");
doc.setFontSize(11);
doc.cell(leftMargin, topMargin, cellWidth, headerRowHeight, cellContent, i)
}
else if (rowCount == 2) {
doc.margins = 1;
doc.setFont("Times ");
doc.setFontType("normal");
// or for normal font type use ------ doc.setFontType("normal");
doc.setFontSize(11);
doc.cell(leftMargin, topMargin, cellWidth, rowHeight, cellContent, i);
}
else {
doc.margins = 1;
doc.setFont("Times ");
doc.setFontType("normal ");
doc.setFontSize(11);
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;
}
</script>
Automatically not split data to multi pages. You may split manually.
If your ( rowCount * rowHeight ) > 420mm ( A3 Height in mm ) add new page function. ( Sorry I can't edit your code without run )
After add new page leftMargin, topMargin = 0; ( start over )
I added sample code with yours. I hope it's right.
else {
doc.margins = 1;
doc.setFont("Times ");
doc.setFontType("normal ");
doc.setFontSize(11);
if ( rowCount * rowHeight > 420 ) {
doc.addPage();
rowCount = 3; // skip 1 and 2 above
} else {
// now rowcount = 3 ( top of new page for 3 )
// j is your x axis cell index ( j start from 0 on $.each function ) or you can add cellCount like rowCount and replace with
// rowcount is your y axis cell index
left = ( ( j ) * ( cellWidth + leftMargin );
top = ( ( rowcount - 3 ) * ( rowHeight + topMargin );
doc.cell( leftMargin, top, cellWidth, rowHeight, cellContent, i);
// 1st=left margin 2nd parameter=top margin, 3rd=row cell width 4th=Row height
}
}
You can convert html directly to pdf lossless. Youtube video for html => pdf example
html2canvas(element[0], {
onrendered: function (canvas) {
pages = Math.ceil(element[0].clientHeight / 1450);
for (i = 0; i <= pages; i += 1) {
if (i > 0) {
pdf.addPage();
}
srcImg = canvas;
sX = 0;
sY = 1450 * i;
sWidth = 1100;
sHeight = 1450;
dX = 0;
dY = 0;
dWidth = 1100;
dHeight = 1450;
window.onePageCanvas = document.createElement("canvas");
onePageCanvas.setAttribute('width', 1100);
onePageCanvas.setAttribute('height', 1450);
ctx = onePageCanvas.getContext('2d');
ctx.drawImage(srcImg, sX, sY, sWidth, sHeight, dX, dY, dWidth, dHeight);
canvasDataURL = onePageCanvas.toDataURL("image/png");
width = onePageCanvas.width;
height = onePageCanvas.clientHeight;
pdf.setPage(i + 1);
pdf.addImage(canvasDataURL, 'PNG', 35, 30, (width * 0.5), (height * 0.5));
}
pdf.save('testfilename.pdf');
}
});
var a = 0;
var d;
var increment;
for(n in array){
d = a++;
if(n % 6 === 0 && n != 0){
doc.addPage();
a = 1;
d = 0;
}
increment = d == 0 ? 10 : 50;
size = (d * increment) <= 0 ? 10 : d * increment;
doc.text(array[n], 10, size);
}
So the createImageRegion method ignores all pixels with a tiny bit of alpha/opacity.
How can you make this function so that also pixels with an opacity of .5 or something will be count for hitdetection?
I looked into KineticJS. A colorKey is added to a hitregion, but it transforms the key to a hex key with no alpha. I can't figure out a way how i could make this work.
Help is much appriciated!
this is where the magic happens. But i don't understand how i can include pixels whith any kind of transpanacy but 0
createImageHitRegion: function (callback) {
var canvas = new Kinetic.Canvas(this.attrs.width, this.attrs.height);
var context = canvas.getContext();
context.drawImage(this.attrs.image, 0, 0);
try {
var imageData = context.getImageData(0, 0, canvas.getWidth(), canvas.getHeight());
var data = imageData.data;
var rgbColorKey = Kinetic.Type._hexToRgb(this.colorKey);
// replace non transparent pixels with color key
for (var i = 0, n = data.length; i < n; i += 4) {
data[i] = rgbColorKey.r;
data[i + 1] = rgbColorKey.g;
data[i + 2] = rgbColorKey.b;
// i+3 is alpha (the fourth element)
}
var that = this;
Kinetic.Type._getImage(imageData, function (imageObj) {
that.imageHitRegion = imageObj;
if (callback) {
callback();
}
});
}
catch (e) {
Kinetic.Global.warn('Unable to create image hit region. ' + e.message);
}
}
When i include: data[i + 3] = 255 (rgbColorKey.a) does not excist, none of the imageevents are working anymore
I found the answer:
for (var i = 0, n = data.length; i < n; i += 4) {
data[i] = rgbColorKey.r;
data[i + 1] = rgbColorKey.g;
data[i + 2] = rgbColorKey.b;
if (!ignoreAlpha && data[i + 3] > 0) {
data[i + 3] = 255;
}
}
This way, every pixel which has a bit of transparancy left, it will get a full color. So if you prototype this to kinetixJS it should work:
Kinetic.Image.prototype.createImageHitRegion = function (callback, ignoreTransparantPixels) {
var canvas = new Kinetic.Canvas(this.attrs.width, this.attrs.height);
var context = canvas.getContext();
var _ignoreTransparantPixels;
if(typeof ignoreTransparantPixels == 'undefined'){
_ignoreTransparantPixels = false;
}
context.drawImage(this.attrs.image, 0, 0);
try {
var imageData = context.getImageData(0, 0, canvas.getWidth(), canvas.getHeight());
var data = imageData.data;
var rgbColorKey = Kinetic.Type._hexToRgb(this.colorKey);
// replace non transparent pixels with color key
for (var i = 0, n = data.length; i < n; i += 4) {
data[i] = rgbColorKey.r;
data[i + 1] = rgbColorKey.g;
data[i + 2] = rgbColorKey.b;
if (!_ignoreTransparantPixels && data[i + 3] > 0) {
data[i + 3] = 255;
}
//trace(data[i + 3]);
// i+3 is alpha (the fourth element)
}
var that = this;
Kinetic.Type._getImage(imageData, function (imageObj) {
that.imageHitRegion = imageObj;
if (callback) {
callback();
}
});
}
catch (e) {
Kinetic.Global.warn('Unable to create image hit region. ' + e.message);
}
}