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Posted 1 Apr 2015

Draw ASP.NET Chart using HTML5 and jQuery

, 14 Jul 2015
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In this article we will see using ASP.NET,HTML5 and jQuery how to draw our charts like Line,Bar,Pie,Donut and Bubble Chart

Introduction

In my previous article “Web Painting Tool Using HTML 5 CANVAS in ASP.Nethttp://www.codeproject.com/Articles/794617/ASP-NET-Web-Painting-TOOL-using-HTML  . I have explained about how to create a simple Web Painting tool using HTML5 and jQuery.I have used the program and with the help of few reference websites http://blog.yojimbocorp.com/2012/01/17/creating-a-simple-pie-chart-with-html5-canvas/ to draw a simple Chart using HTML5 and jQuery.

There might be some question on why we need to draw our own Chart as lots of free and 3rd party Charts available.
The answer to this questions are even if there are lots of free Chart controls available some time all the chart controls will not fulfill our requirement.

For example if we want to add our own water marks to our Chart, if we want to display our own alert Status Image Display, If we want to add our Company Logo to Chart and etc..

It will be hard to find the Chart controls with all other extra requirement. The Customization will not be possible with other Chart controls. Think if we draw and design our own Chart controls and use that in our projects. There are no limitations to add all our features to draw and design our own Chart. Here the limitation is up to our imagination.

For this reasons I thought to Draw a Chart with the below features using ASP.NET, HTML5 and jQuery.

In the Source Code ZIP file you can find both Visual Studio 2010 and Visual Studio 2013 Solutions .You can use any solutions as per your Visual studio Versions.

In this article we will see using HTML5 and jQuery how to draw our charts like

  1. Line Chart
  2. Bar Chart
  3. Line & Bar Chart
  4. Pie Chart
  5. Donut Chart
  6. Bubble Chart

MY BAR Chart Features

All this below features will be used for all chart types we can see one by one in code part.

Chart Source Data

The plot data from a database / Data Table / List / XML file or any source depending on your requirements. The only thing you need to do is get the data from your source and bind the result to a Dropdown List. (With the value and text. Here the value will be an integer for plotting the value and the text will be to be displayed in the label.)

Chart Number of Category

Here I have limited the Chart Category display from a minimum of 1 to a maximum of 12. This means here dynamically we can load the plots category depending on the data source. But limited, since the display plots value is within 12 plots. (But the user can redesign the code easily depending on requirements.)

Chart Title Text

The user can add their own Chart Title and dynamically change the titles if required. Here in my example I will draw the Title TextBox text at the bottom of the Bar Chart. (The user can redesign and customize this depending on requirements.)

Chart Water Mark Text

In some cases we need to add our company name as a Water Mark to our Bar Chart. Here in my example I will draw the Water Mark TextBox text at the center of the Bar Chart. (The user can redesign and customize this depending on requirements.)

Chart Company LOGO

The user can add their own company logo to the Chart. (Here for the sample I have added my own image as a log at the top-right corner. (The user can redesign and customize this depending on your requirements if needed.).
 

Chart Alert Image

Chart Alert Image Display: You can see from the article the first Image has Labels, I have displayed the Bar Chart label Text and Alert Image. If the “Alert On” radio button is checked I will display the Alert Image. If the “Alert Off” radio button is clicked then the Alert Image will not be displayed.

What is the use of an Alert Image?

Let's consider a real project. For example we need to display a Pie Chart for a manufacturing factory with production results Good and Bad. For example if the production result for each quality value is above 300 then we need to display the Alert Green image and if the quality value is below 300 then we need to display the Red image with label bars.

This Alert Image will be easy to identify each quality result as good or bad. (Here for a sample I have used 2 quality check and displayed using Green and Red images but users can customize depending on requirements and add your own image and logic.)

Chart Color Theme

The user can select any one Color Theme for the Chart as Green Theme or Blue Theme.

Legend Display
User can enable or disable the display of Legend for the Chart using the check box. If the “Show Legend “Checkbox is checked then the chart will be display with label and alert image. If not checked then the legend will not be displayed in the chart.

Save Chart as Image

The user can save the chart as an image.

Using the code

Step 1: Create new ASP.NET Web project

Click Start program then open Visual Studio 2013 or Visual Studio 2010 (depending on your installed version), select either one. Click "File" -> "New" -> "Project..." then select ASP.NET WEB Project then click Create.

Step 2:Add canvas tag to your webform

Add a new Webform and add a Canvas ELEMENT within the Section Tag.

<SECTION style="border-style: solid; border-width: 2px; width: 800px;">

<CANVAS HEIGHT="600px" WIDTH="800px" ID="canvas">

Your browser is not supporting HTML5 Canvas .Upgrade Browser to view this program or check with Chrome or in Firefox.

</CANVAS>

</SECTION>

Step 3: Script to Draw Chart in step by step

 

1) Script Global variable: First add the global variable which needs to be used to draw chart inside script tag.

I have commented the line before for each variable about its use.Here ChartWidth and chartHeigth variable will be used to store and draw the Chart width and height depend on the Canvas size.

//public Canvas object to use in all the functions.

        //this variable will be used to check for the result of Alert Image display

        var alertCheckValue = 300;

       //Adding the Pic Chart Colors to array .Here i have fixed to 12 colors and 12 datas to add as Pic Chart.if you want you can add more from here.

       var pirChartColor = ["#6CBB3C", "#F87217", "#EAC117", "#EDDA74", "#CD7F32", "#CCFB5D", "#FDD017", "#9DC209", "#E67451", "#728C00", "#617C58", "#64E986"]; // green Color Combinations

        // var pirChartColor = ["#3090C7", "#BDEDFF", "#78C7C7", "#736AFF", "#7FFFD4", "#3EA99F", "#EBF4FA", "#F9B7FF", "#8BB381", "#BDEDFF", "#B048B5", "#4E387E"]; // Blue Color Combinations

        var lineColor = "#3090C7";

        var lineOuterCircleColor = "#6CBB3C";

        var lineInnerCircleColor = "#FFFFFF";


        //declare the Canvas object

        var canvas;

        var chartCTX;


        // declare the Border Space,Chart Start X and Y Position;

        var xSpace = 80;

        var ySpace = 80;

        //declare the Chart DrawWidth and Hegith

        var chartWidth, chartHeight;


        // declared the Chart Legend Width and Hegit

        var legendWidth, legendHeight;


        //declared the Chart data Minimum Value,maximum Value and Noofplots(Bars/Arc and Line points)

        var minDataVal, maxDataVal, noOfPlots;


        //here we declare the Image for the Chart legend alert status display.

        var greenImage = new Image();

        var redImage = new Image();

        //Alert Image Size widht and hegith

        var imagesize = 20;

        var maxValdivValue;

        //Here we declare the X,YAxis Font size and Color

        var fotnColor = "#000000";

        var axisfontSize = 10;


        var LogoImage = new Image();

        var LogoImgWidth = 120;

        var LogoImgHeight = 70;

        // This arrawy wil be used to draw the Legends

        rect = {};

        rectInner = {};

 

“Note : I have used the Master pages so in script before each control I will use the ContentPlaceHolderID.

For example my green color theme radio button id is rdoColorGreen. But for jQuery I will be use like this cphBody_rdoColorGreen

For example if we use master page then we add ContentPlaceHolderID like this in script

if ($('#cphBody_rdoColorGreen:checked').val() == "rdoColorGreen") {

}

If we not used the master page and we draw chat in our webform with out including the master page then we need remove the contentploceholder id like this.

if ($('# rdoColorGreen:checked').val() == "rdoColorGreen") {

}

2) Chart Color Theme: In this method depend on the user color selection checked from the radio button I will select the Color Array to fill the color for each plots. This is common function which can be used to draw any chart like Line, bar, Pie, Donut and etc.

function ChangeChartColor() {

            if ($('#cphBody_rdoColorGreen:checked').val() == "rdoColorGreen") {

                pirChartColor = ["#6CBB3C", "#F87217", "#EAC117", "#EDDA74", "#CD7F32", "#CCFB5D", "#FDD017", "#9DC209", "#E67451", "#728C00", "#617C58", "#64E986"]; // green Color Combinations

                lineColor = "#3090C7"; // Blue Color for Line

               lineOuterCircleColor = "#6CBB3C"; // Green Color for Outer Circle

            }

            else {

                pirChartColor = ["#3090C7", "#BDEDFF", "#78C7C7", "#736AFF", "#7FFFD4", "#3EA99F", "#EBF4FA", "#F9B7FF", "#8BB381", "#BDEDFF", "#B048B5", "#4E387E"]; // Blue Color Combinations

                lineColor = "#F87217";  // Orange Color for the Line

                lineOuterCircleColor = "#F70D1A "; // Red Color for the outer circle

            }

        }

3) Chart Color Theme: This method will be used to get the X and Y Point to draw our chart. This is common function which can be used to draw any chart like Line, bar, Pie, Donut and etc.

function getXPlotvalue(val) {

            return (Math.round((chartWidth - xSpace) / noOfPlots)) * val + (xSpace * 1.5)-24;

        }

        // Return the y pixel for a graph point

        function getYPlotVale(val) {

            return chartHeight - (((chartHeight - xSpace) / maxDataVal) * val);

        }

 

4) Draw legend: This method will be used to draw the legend for the chart .In this method I will draw label with color and add label text and Alert Image inside the label. This is common function which can be used to draw any chart like Line, bar, Pie, Donut and etc.(In Line chart I don’t use this Legend as line chart is not required for the Label display)

// This function is used to draw the Legend

        function drawLengends() {

            ctx.fillStyle = "#7F462C";

            ctx.fillRect(rect.startX, rect.startY, rect.w, rect.h);

            //Drawing Inner White color Rectange with in Above brown rectangle to plot all the Lables with color,Text and Value.

            ctx.fillStyle = "#FFFFFF";

            rectInner.startX = rect.startX + 1;

            rectInner.startY = rect.startY + 1;

            rectInner.w = rect.w - 2;

            rectInner.h = rect.h - 2;

            ctx.fillRect(rectInner.startX, rectInner.startY, rectInner.w, rectInner.h);

            labelBarX = rectInner.startX + 4;

            labelBarY = rectInner.startY + 4;

            labelBarWidth = rectInner.w - 10;

            labelBarHeight = (rectInner.h / noOfPlots) - 5;

            colorval = 0;

            // here to draw all the rectangle for Lables with Image display

            $('#cphBody_DropDownList1 option').each(function () {

                ctx.fillStyle = pirChartColor[colorval];

                ctx.fillRect(labelBarX, labelBarY, labelBarWidth, labelBarHeight);

                // Here we check for the rdoAlert Status is On - If the Alert is on then we display the Alert Image as per the  Alert check value.

                if ($('#cphBody_rdoAlaramOn:checked').val() == "rdoAlaramOn") {

                    // Here we can see fo ever chart value we check with the condition .we have initially declare the alertCheckValue as 300.

                    //so if the Chart Plot value is Greater then or equal to the check value then we display the Green Image else we display the Red Image.

                    //user can change this to your requiremnt if needed.This is optioan function for the Pie Chart.

                    if (parseInt($(this).val()) >= alertCheckValue) {

                        ctx.drawImage(greenImage, labelBarX, labelBarY + (labelBarHeight / 3) - 4, imagesize, imagesize);

                    }

                    else {

                        ctx.drawImage(redImage, labelBarX, labelBarY + (labelBarHeight / 3) - 4, imagesize, imagesize);

                    }

                }

                //Draw the Pie Chart Label text and Value

                ctx.fillStyle = "#000000";

                ctx.font = '10pt Calibri';

                ctx.fillText($(this).text(), labelBarX + imagesize + 2, labelBarY + (labelBarHeight / 2));

                // To Increment and draw the next bar ,label Text and Alart Image.

                labelBarY = labelBarY + labelBarHeight + 4;

                //  labelTextYXVal = labelBarY + labelBarHeight - 4;

                colorval = colorval + 1;

            });

        }

5) Draw Chart: This is the main method .In button Draw Chart Image button clicks I will call this method first ,from this method I will call other methods as per requirement.

In this method I have explained in comment before each code .This method has 5 main code parts as we can see here.In comment I have explained using Steps at each part.

1) First we calculate and store all necessary variables like Item Maximum Value, Item total Count, Chart Width, Chart Height, legend Width, Legend height at etc.

2) Draw legend.

 3) Add Chart Title and Logo to chart.

 4) Draw X-Axis Line with Plot text.

5) Draw Y- Axis Line with Y-Axis plot value.

6) Draw Bar Chart method(Next we call the method which need to be draw as our chart. For each chart I have created a separate method. For example to draw the Bar Chart I will call the “drawBarChart()” method, to draw line chart I will call the “drawLineChart()” method and etc.

7) Draw the Water Mark text for the chart.

// This is the main function to darw the Charts

        function drawChart() {
            ChangeChartColor();
            // asign the images path for both Alert images
            greenImage.src = '../images/Green.png';
            redImage.src = '../images/Red.png';
            LogoImage.src = '../images/shanu.jpg';
            // Get the minumum and maximum value.here i have used the hidden filed from code behind wich will stored the Maximum and Minimum value of the Drop down list box.
            minDataVal = $('#cphBody_hidListMin').val();
            maxDataVal = $('#cphBody_hidListMax').val();
            // Total no of plots we are going to draw.
            noOfPlots = $("#cphBody_DropDownList1 option").length;
            maxValdivValue = Math.round((maxDataVal / noOfPlots));
            //storing the Canvas Context to local variable ctx.This variable will be used to draw the Pie Chart

            canvas = document.getElementById("canvas");
            ctx = canvas.getContext("2d");

            //globalAlpha - > is used to display the 100% opoacity of chart .because at the bottom of the code I have used the opacity to 0.1 to display the water mark text with fade effect.

            ctx.globalAlpha = 1;
            ctx.fillStyle = "#000000";
            ctx.strokeStyle = '#000000';
            //Every time we clear the canvas and draw the chart
            ctx.clearRect(0, 0, canvas.width, canvas.height);
            //If need to draw with out legend for the Line Chart
            chartWidth = canvas.width - xSpace;
            chartHeight = canvas.height - ySpace;

            //  step 1) Draw legend $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$########################

            if ($('#cphBody_chkLegend:checked').val() == "on") {
                chartWidth = canvas.width - ((canvas.width / 3) - (xSpace / 2));
                chartHeight = canvas.height - ySpace - 10;
                legendWidth = canvas.width - ((canvas.width / 3) - xSpace);
                legendHeight = ySpace;
                rect.startX = legendWidth;
                rect.startY = legendHeight;
                rect.w = canvas.width / 3 - xSpace - 10;
                rect.h = canvas.height - ySpace - 10;
                //In this method i will draw the legend with the Alert Image.
                drawLengends();
            }

            // end step 1) $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

            var chartMidPosition = chartWidth / 2 - 60;

            ////        //If need to draw with legend

            ////        chartWidth = canvas.width - ((canvas.width / 3) - (xSpace / 2));

            ////        chartHeight = canvas.height - ySpace - 10;

            // Step 2 ) +++++++++++++ To Add Chart Titel and  Company Logo

            //To Add Logo to Chart

            var logoXVal = canvas.width - LogoImgWidth - 10;
            var logolYVal = 0;
            //here we draw the Logo for teh chart and i have used the alpha to fade and display the Logo.
            ctx.globalAlpha = 0.6;
            ctx.drawImage(LogoImage, logoXVal, logolYVal, LogoImgWidth, LogoImgHeight);
            ctx.globalAlpha = 1;
            ctx.font = '22pt Calibri';
            ctx.fillStyle = "#15317E";
            ctx.fillText($('#cphBody_txtTitle').val(), chartMidPosition, chartHeight + 60);
            ctx.fillStyle = "#000000";
            ctx.font = '10pt Calibri';
            // end step 2) +++++++++++ End of Title and Company Logo Add

            // Step 3 ) +++++++++++++ toDraw the X-Axis and Y-Axis

            //  >>>>>>>>> Draw Y-Axis and X-Axis Line(Horizontal Line)

            // Draw the axises
            ctx.beginPath();
            ctx.moveTo(xSpace, ySpace);
            // first Draw Y Axis
            ctx.lineTo(xSpace, chartHeight);
            // Next draw the X-Axis
            ctx.lineTo(chartWidth, chartHeight);
            ctx.stroke();
            //  >>>>>>>>>>>>> End of X-Axis Line Draw
            //end step 3) +++++++++++++++++++++++

            // Step 4) <<<<<<<<<<<<<<<<<<<<<<< To Draw X - Axis Plot Values <<<<<<<<<<<<< }}}}}}

            // Draw the X value texts

            // --->>>>>>>>>>>>  for the Bar Chart i have draw the X-Axis plot in  drawBarChart

            //  <<<<<<<<<<<<<<<<<<<<<<< End of X Axis Draw

            // end Step 4) <<<<<<<<<<<<<<<<<<<<<<<

            // Step 5){{{{{{{{{{{{

            // {{{{{{{{{{{{{To Draw the Y Axis Plot Values}}}}}}}}}}}}}}

            var vAxisPoints = 0;

            var max = maxDataVal;

            max += 10 - max % 10;

            for (var i = 0; i <= maxDataVal; i += maxValdivValue) {

                ctx.fillStyle = fotnColor;

                ctx.font = axisfontSize + 'pt Calibri';

                ctx.fillText(i, xSpace - 40, getYPlotVale(i));

                //Here we draw the Y-Axis point line

                ctx.beginPath();

                ctx.moveTo(xSpace, getYPlotVale(i));

                ctx.lineTo(xSpace - 10, getYPlotVale(i));

                ctx.stroke();

                vAxisPoints = vAxisPoints + maxValdivValue;

            }


            //{{{{{{{{{{{{{{ End of Y- Axis Plot Values

            //end  Step 5) {{{{{{{{{{{{{{{{{{


            //Step 5) *********************************************************

            //Function to Draw our Chart here we can Call/Bar Chart/Line Chart or Pie Chart

            // to Draw Bar Chart

            drawBarChart();

            // to Draw line Chart

            drawLineChart();

            // end step 6) **************

            //Step 7)  :::::::::::::::::::: to add the Water mark Text

            // Here add the Water mark text at center of the chart

            ctx.globalAlpha = 0.1;

            ctx.font = '86pt Calibri';

            ctx.fillStyle = "#000000";

            ctx.fillText($('#cphBody_txtWatermark').val(), chartMidPosition - 40, chartHeight / 2);

            ctx.font = '10pt Calibri';

            ctx.globalAlpha = 1;

            /// end step 7) ::::::::::::::::::::::::::::::::::::::

}

Here we see the entire method one by one which will be used to draw chart.

Draw Bar Chart: in this method I will calculate all the data with plot x and y point and draw the rectangle one by one to draw the bar chart.

function drawBarChart() {

            var XvalPosition = xSpace;
            widthcalculation = parseInt(((parseInt(chartWidth) - 100) / noOfPlots));
            colorval = 0;
            $('#cphBody_DropDownList1 option').each(function () {

                // Draw Xaxis Plots Line and Text   ***********
                XvalPosition = XvalPosition + widthcalculation;
                ctx.moveTo(XvalPosition, chartHeight);
                ctx.lineTo(XvalPosition, chartHeight + 15);
                ctx.stroke();
                ctx.fillStyle = "#000000";
                ctx.font = '10pt Calibri';
                ctx.fillText('Bar' + parseInt(colorval + 1), XvalPosition - 28, chartHeight + 24);

                //  End Xval Plotting  ************

                //Draw Bar Graph  **************==================********************

                var barRatio = parseInt($(this).val()) / maxDataVal;
                var barfillHeight = parseInt(barRatio * (parseInt(chartHeight - xSpace)));
                ctx.fillRect(XvalPosition - widthcalculation - 1, chartHeight - 1, widthcalculation + 2, -barfillHeight);
                ctx.fillStyle = pirChartColor[colorval];
                //  e.DrawRectangle(B1pen, XvalPosition_Start, Ystartval, XvalPosition_new, YEndval);
                ctx.fillRect(XvalPosition - widthcalculation, chartHeight, widthcalculation, -barfillHeight);
                //ctx.fillRect(XvalPosition - widthcalculation, yLineHeight, widthcalculation, yLineHeight- parseInt($(this).val()));
                // *****

                //////            ctx.fillStyle = "#000000";
                //////            ctx.font = '10pt Calibri';
                //////            ctx.fillText($(this).val(), XvalPosition - widthcalculation + 4, chartHeight - barfillHeight - 8);
                ctx.fillStyle = pirChartColor[colorval];
                //END Draw Bar Graph  **************==================********************
                colorval = colorval + 1;
            });

        }

Draw Line Chart: in this method I will calculate all the data with plot x and y point and draw the line with Dot and Item text to be draw for each line point.

function drawLineChart() {

            // For Drawing Line

            ctx.lineWidth = 3;
            var value = $('select#cphBody_DropDownList1 option:selected').val();
             ctx.beginPath();
            // *************** To Draw the Line and Plot Value in Line
            ctx.fillStyle = "#FFFFFF";
            ctx.strokeStyle = '#FFFFFF';
            ctx.moveTo(getXPlotvalue(0), getYPlotVale(value));
            ctx.fillStyle = "#000000";
            ctx.font = '12pt Calibri';
            ctx.fillText(value, getXPlotvalue(0), getYPlotVale(value) - 12);
            var ival = 0;
            $('#cphBody_DropDownList1 option').each(function () {

                if (ival > 0) {
                    ctx.lineTo(getXPlotvalue(ival), getYPlotVale($(this).val()));
                    ctx.stroke();
                    ctx.fillStyle = "#000000";
                    ctx.font = '12pt Calibri';
                    ctx.fillText($(this).val(), getXPlotvalue(ival), getYPlotVale($(this).val()) - 16);
                }

                ival = ival + 1;
                ctx.fillStyle = lineColor;
                ctx.strokeStyle = lineColor;
            });

            // *************** To Draw the Line Dot Cericle
            //For Outer Blue Dot
           ival = 0;
            $('#cphBody_DropDownList1 option').each(function () {

                ctx.fillStyle = lineOuterCircleColor;
                ctx.strokeStyle = lineOuterCircleColor;
                ctx.beginPath();
                ctx.arc(getXPlotvalue(ival), getYPlotVale($(this).val()), 7, 0, Math.PI * 2, true);
                ctx.fill();
                ctx.fillStyle = lineInnerCircleColor;
                ctx.strokeStyle = lineInnerCircleColor;
                ctx.beginPath();
                ctx.arc(getXPlotvalue(ival), getYPlotVale($(this).val()), 4, 0, Math.PI * 2, true);
                ctx.fill();
                ival = ival + 1;
            });
            ctx.lineWidth = 1;
        }

Draw Pie Chart: same like the bar chart here I will calculate for all the point and draw the pie chart using “arc” method.

function drawPieChart() {

        var lastend = 0;

        var XvalPosition = xSpace;

        chartWidth = (canvas.width / 2) - xSpace;

        chartHeight = (canvas.height / 2) - (xSpace / 2);

        widthcalculation = parseInt(((parseInt(chartWidth) - 100) / noOfPlots));

        //Draw Xaxis Line

        //-- draw bar X-Axis and Y-Axis Line

        var XLineStartPosition = xSpace;

        var yLineStartPosition = xSpace;

        var yLineHeight = chartHeight;

        var xLineWidth = chartWidth;

        colorval = 0;

        var chartTotalResult = getChartTotal();

        $('#cphBody_DropDownList1 option').each(function () {

            ctx.fillStyle = pirChartColor[colorval];

            ctx.beginPath();

            ctx.moveTo(chartWidth, chartHeight);

            //Here we draw the each Pic Chart arc with values and size.

            ctx.arc(chartWidth, chartHeight + 6, chartHeight, lastend, lastend +

              (Math.PI * 2 * (parseInt($(this).val()) / chartTotalResult)), false);

            ctx.lineTo(chartWidth, chartHeight);

            ctx.fill();

            lastend += Math.PI * 2 * (parseInt($(this).val()) / chartTotalResult);

            //END Draw Bar Graph  **************==================********************

            colorval = colorval + 1;

        });

    }

Draw Donut Chart: same like the pie chart here I will calculate for all the point and draw the pie chart using “arc” method. For the Donut chart to draw donut shape we use the “donutoutcircle” and “donutInnsercircle” value .Here I will check for the Chart width and height I will draw the donut chart size.

function drawDonutChart() {

        var lastend = 0;
        var XvalPosition = xSpace;
        chartWidth = (canvas.width / 2) - xSpace;
        chartHeight = (canvas.height / 2) - (xSpace / 2);
        widthcalculation = parseInt(((parseInt(chartWidth) - 100) / noOfPlots));
        var donutOutercircle = chartHeight / 2;
        var donutinnersircle = (chartWidth / 2) + xSpace;
        colorval = 0;
        var chartTotalResult = getChartTotal();
        var legend1 = 0;
        $('#cphBody_DropDownList1 option').each(function () {   
            ctx.fillStyle = pirChartColor[colorval];
            legend1 += (Math.PI * 2 * (parseInt($(this).val()) / chartTotalResult));
            //----

            ctx.beginPath();

            ctx.moveTo(chartWidth, chartWidth);

            ctx.arc(chartWidth, chartWidth, donutOutercircle, lastend, legend1, false); // Outer: CCW

            ctx.arc(chartWidth, chartWidth, donutinnersircle, legend1, lastend, true); // Inner: CW

            //------

            ctx.fill();

            lastend += Math.PI * 2 * (parseInt($(this).val()) / chartTotalResult);

            //END Draw Bar Graph  **************==================********************

            colorval = colorval + 1;

        });

    }

Draw Bubble Chart: same like the line chart we draw the Bubble chart but here use the ‘arc” method to draw our circle for each item.

// to Draw Bubble Chart

        function drawBubbleChart() {
            // *************** To Draw the Line Dot Cericle
            ctx.globalAlpha = 0.8;
            //For Outer Blue Dot
            var bubbleSize = 40;
            ival = 0;
            $('#cphBody_DropDownList1 option').each(function () {
                ctx.fillStyle = pirChartColor[ival];
                ctx.strokeStyle = pirChartColor[ival];
                ctx.beginPath();
   ctx.arc(getXPlotvalue(ival) + 14, getYPlotVale($(this).val()), bubbleSize, bubbleSize, Math.PI * 2, true);
                ctx.fill();
                ival = ival + 1;

            });
            ctx.lineWidth = 1;
        }

6) Save Chart: In the save method first I will check for the browser version. If the browser is not IE that means Chrome or Firefox then using the “canvas.toDataURL” method I will save the image. Because this method will not be work in Internet Explorer’, for  “Internet Explorer'” then using the Ajax post method I will save the image.

function ShanuSaveImage() {
            var m = confirm("Are you sure to Save ");
            if (m) {
                if (navigator.appName == 'Microsoft Internet Explorer') {
                    var image_NEW = document.getElementById("canvas").toDataURL("image/png");
                    image_NEW = image_NEW.replace('data:image/png;base64,', '');
                    $.ajax({
                        type: 'POST',
                        contentType: 'application/json; charset=utf-8',
                        url: '/shanuHTML5PIEChart.aspx/SaveImage',
                        data: '{ "imageData" : "' + image_NEW + '" }',
                        async: false,
                        success: function (msg) {
                            alert(msg.d);
                        },
                        error: function () {
                            alert("Pie Chart Not Saved");
                        }
                    });
                }
                else {
                    // save image without file type
                    var canvas = document.getElementById("canvas");
      document.location.href = canvas.toDataURL("image/png").replace("image/png", "image/octet-stream");

                    var ImageSave = document.createElement('a');
                    ImageSave.download = "shanuPIEImage.png";
            ImageSave.href = canvas.toDataURL("image/png").replace("image/png", "image/octet-stream");
                    ImageSave.click();
                    alert("Image Saved");

                }

            }

        }

 

6) Bind Dropdown List Data from DataTable:In the page Load and in Button Click I will call the “BindDropDownList()” method to populate the PIE Chart values in DataTable and bind the final result to the Dropdown List.

Here for simple example I have used the DataTable to populate data and bind the result to dropdown list.

You can write your own code to bind the result to Dropdown list. Even you can change the source from Dropdown List to any control as per your requirements.

This Dropdown list items will be get in JavaScript and using the values the pie chart will be created dynamically.

protected void Page_Load(object sender, EventArgs e)

        {
            BindDropDownList();
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            BindDropDownList();
        }

        private void BindDropDownList()
        {
            DataTable dt = new DataTable();

            dt.Clear();

            dt.Rows.Clear();

            dt.Columns.Add("Names");

            dt.Columns.Add("Frequency");

            dt.Columns["Frequency"].DataType = Type.GetType("System.Int32");

            Random random = new Random();          

                for (int i = 1; i <=Convert.ToInt32(txtChartCount.Text.Trim()); i++)
                {
                    DataRow row = dt.NewRow();

                    Int32 value = random.Next(100, 600);

                    row["Names"] = "Bar-" + i.ToString() + " - (" + value+") ";

                    row["Frequency"] = value;

                    dt.Rows.Add(row);
                }

                DropDownList1.DataSource = dt;
                DropDownList1.DataTextField = "Names";
                DropDownList1.DataValueField = "Frequency";
                DropDownList1.DataBind();  

        }

 

Tested Browsers:

  • Chrome
  • Firefox
  • IE10

Output:

Line Chart

Bubble Chart

Donut Chart

Points of Interest

We can use the same logic to create Winform version Chart Controls .for example you can see my Pareto Chart control which I was created for Windows form version the link is here.

http://www.codeproject.com/Articles/802845/Pareto-Chart-Csharp

Working with HTML5 is really fun. I hope you enjoyed reading my article. I will be happy if someone benefits from my article.

History

ShanuHTML5ChartV1.0 - 2015-04-02

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

syed shanu
Team Leader
India India

Microsoft MVP 2016


My Interview on Microsoft TechNet Wiki Ninja Link




His Blog


Syed Shanu is basically from Madurai, Tamil Nadu, India.He was been working in South Korea for past 8 years. He started programming with Basic Language and C language from his high school at 1999.In 2005 he completed his Master of Computer Application. He started his working Career from Dec 2004 with ASP.

He has 10+ years of Experience in Microsoft Technologies.

His work experience with Language and Technology start’s from ASP and SQL Server, Then VB.NET and C# for PDA Application, Touch Screen Application Development, Desktop Application, ASP.NET Web Application Development, MVC and WPF.

He loves to work with Microsoft technology as he started to work on .Net Frame Work version from 1.0 to 4.5.

He had worked with HMI (Human Machine Interface) programs like PLC, Nutrunner Tools, and Sensor programs, RFID programs, Barcode programs and etc.

He usually uses his free time to spend with his Family and go outing. He loves photography and Hiking.

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Comments and Discussions

 
GeneralMy vote. Pin
Member 1135189320-Jul-15 0:09
memberMember 1135189320-Jul-15 0:09 
GeneralRe: My vote. Pin
syed shanu20-Jul-15 13:31
mvpsyed shanu20-Jul-15 13:31 
QuestionCan you elaborate the updates in history? Pin
super15-Jul-15 4:40
professionalsuper15-Jul-15 4:40 
QuestionID mangling Pin
Sinisa Hajnal3-Apr-15 10:20
professionalSinisa Hajnal3-Apr-15 10:20 
QuestionGreat Effort. My Vote 5! Pin
Priyank Modi3-Apr-15 4:27
memberPriyank Modi3-Apr-15 4:27 
QuestionMy Vote of 5. Pin
aarif moh shaikh2-Apr-15 19:12
professionalaarif moh shaikh2-Apr-15 19:12 
AnswerRe: My Vote of 5. Pin
Divyam Sharma2-Apr-15 19:13
memberDivyam Sharma2-Apr-15 19:13 

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