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jpk81
#1 Posted : Monday, June 16, 2014 8:04:40 AM(UTC)
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Hi, I am trying to get the canvas coordinates from 2 points on my chart where the lines cross zero. I am trying to overlay some information that will show the user the difference between the two points at the crossing. I have created 2 lines that start from below 0 and continue on. There is a third line drawn that plots two extra points at the zero intersection, it is this line that I am trying to get the coordinates from, any help?
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Dragan
#2 Posted : Tuesday, June 17, 2014 7:48:36 AM(UTC)
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You can try using the following code:

Code:
    <script lang="javascript" type="text/javascript">

        $(document).ready(function () {


            $('#jqChart').jqChart({
                title: { text: 'Line Chart' },
                tooltips: { type: 'shared' },
                animation: { duration: 1 },
                series: [
                    {
                        type: 'line',
                        title: 'Series 1',
                        strokeStyle: '#418CF0',
                        lineWidth: 2,
                        data: [[1, 62], [2, 60], [3, 68],
                               [4, 58], [5, 52], [6, 60], [7, 48]]
                    },
                    {
                        type: 'line',
                        title: 'Series 2',
                        strokeStyle: '#FCB441',
                        lineWidth: 2,
                        data: [[1, 46], [2, 40], [3, 62],
                               [4, 65], [5, 60], [6, 36], [7, 70]]
                    }
                ]
            });

            $('#button').click(function () {

                var chart = $('#jqChart').jqChart('chart');
                var axes = chart.axes.items;

                var xAxis = axes[0];
                var yAxis = axes[1];

                // the coordiates of (1, 62) data point.
                var xCoord = xAxis.getPosition(1);
                var yCoord = yAxis.getPosition(62);

            });
        });
    </script>

</head>
<body>
    <div>
        <div id="jqChart" style="width: 500px; height: 300px;"></div>
        <input type="button" id="button" value="Click" />
    </div>
</body>
Best Regards,
Dragan Matek
jqChart Inc.
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1 user thanked Dragan for this useful post.
jpk81 on 6/19/2014(UTC)
jpk81
#3 Posted : Thursday, June 19, 2014 2:59:36 AM(UTC)
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Thanks!
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nelsonbn
#4 Posted : Monday, February 2, 2015 6:43:55 AM(UTC)
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I would like to know if it's possible to know the canvas coordenates with "getPosition" from the axis of the "Category" type.

When I try to use "getPosition" on a "Category" axis, I get "NaN".

Code:

               <script lang="javascript" type="text/javascript">
            $(document).ready(function () {
                $('#jqChart').jqChart({
                    tooltips: { type: 'shared' },
                    axes: [
                        {
                            type: 'category',
                            location: 'bottom',
                        },
                        {
                            type: 'linear',
                            location: 'left',
                        }
                    ],
                    series: [
                        {
                            type: 'line',
                            strokeStyle: '#418CF0',
                            lineWidth: 2,
                            data: [["A", 62], ["B", 60], ["C", 68],
                                   ["D", 58], ["E", 52], ["F", 60], ["G", 48]]
                        }
                    ]
                });

                $('#jqChart').bind('dataHighlighting', function (event, data) {
                
                    if(data) {
                        var chart = $('#jqChart').jqChart('chart');
                        var axes = chart.axes.items;
                        
                        var xAxis = axes[0];
                        var yAxis = axes[1];
                        
                        var xCoord = xAxis.getPosition(data.dataItem[0]);
                        var yCoord = yAxis.getPosition(data.dataItem[1]);
                        
                        console.log("::::::::   ", xCoord);
                        console.log("::::::::   ", yCoord);
                    }
                });
            });
        </script>
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Dragan
#5 Posted : Tuesday, February 3, 2015 4:59:14 AM(UTC)
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Groups: Administrators, DataVizJavaScript, jQueryChart, jQueryDV, MvcChart, Registered
Joined: 1/3/2011(UTC)
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Hi,

"getPosition" method requires number values. You can modify your code to:


Code:
$('#jqChart').bind('dataHighlighting', function (event, data) {

                if (data) {
                    var chart = $('#jqChart').jqChart('chart');
                    var axes = chart.axes.items;

                    var xAxis = axes[0];
                    var yAxis = axes[1];

                    var indexOf = $.inArray(data.dataItem, data.series.data);

                    var xCoord = xAxis.getPosition(indexOf);
                    var yCoord = yAxis.getPosition(data.dataItem[1]);

                    console.log("::::::::   ", xCoord);
                    console.log("::::::::   ", yCoord);
                }
            });
Best Regards,
Dragan Matek
jqChart Inc.
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nelsonbn
#6 Posted : Tuesday, February 3, 2015 10:13:01 AM(UTC)
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Thank you for the quick answer. I've tested your solution and works perfectly. Again, thank you, I've been stuck with this problem for a while.
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