Adjusting canvas dimensions for angular chart.js: A quick guide

I am currently creating my first sample code using angular chart.js, but I am facing an issue with changing the custom height and width of my canvas. How can I adjust the height and width accordingly?

CODE:

CSS
#myChart{ width:500px; height:500px; }

HTML

<body ng-controller="LineCtrl">
<canvas id="myChart" ></canvas>
<div class="chart-container">
        <linechart data="data" options="options" mode=""></linechart>
</div>

Javascript

var data = {
    labels: ["January", "February", "March", "April", "May", "June", "July"],
    datasets: [
        {
            label: "My First dataset",
            fillColor: "rgba(220,220,220,0.2)",
            strokeColor: "rgba(220,220,220,1)",
            pointColor: "rgba(220,220,220,1)",
            pointStrokeColor: "#fff",
            pointHighlightFill: "#fff",
            pointHighlightStroke: "rgba(220,220,220,1)",
            data: [65, 59, 80, 81, 56, 55, 40]
        },
        {
            label: "My Second dataset",
            fillColor: "rgba(151,187,205,0.2)",
            strokeColor: "rgba(151,187,205,1)",
            pointColor: "rgba(151,187,205,1)",
            pointStrokeColor: "#fff",
            pointHighlightFill: "#fff",
            pointHighlightStroke: "rgba(151,187,205,1)",
            data: [28, 48, 40, 19, 86, 27, 90]
        }
    ]
};
var options = {
        scaleOverlay : false,
        scaleOverride : false,
        scaleSteps : null,
        scaleStepWidth : null,
        scaleStartValue : null,
        scaleLineColor : "rgba(0,0,0,.1)",
        scaleLineWidth : 1,
        scaleShowLabels : true,
        scaleLabel : "<%=value%>",
        scaleFontFamily : "'proxima-nova'",
        scaleFontSize : 10,
        scaleFontStyle : "normal",
        scaleFontColor : "#909090", 
        scaleShowGridLines : true,
        scaleGridLineColor : "rgba(0,0,0,.05)",
        scaleGridLineWidth : 1, 
        bezierCurve : true,
        pointDot : true,
        pointDotRadius : 3,
        pointDotStrokeWidth : 1,
        datasetStroke : true,
        datasetStrokeWidth : 2,
        datasetFill : true,
        animation : true,
        animationSteps : 60,
        animationEasing : "easeOutQuart",
        onAnimationComplete : null
    }
    var ctx=document.getElementById("myChart").getContext("2d");
var myLineChart = new Chart(ctx).Line(data, options);
//console.log(myLineChart)

Answer №1

To achieve my goal, I had to adjust certain attributes and specify width and height within the context:

var settings = { 
    responsive: true,
    maintainAspectRatio: true
}

Using JavaScript:

var context=document.getElementById("myCanvas").getContext("2d");

context.canvas.width = 200;
context.canvas.height = 200;

var myBarChart = new Chart(context).Bar(data, settings);

Answer №2

To enhance the appearance, I utilized canvas style. Through testing with a Pie Chart, I successfully implemented this method. Check out the sample below:

<canvas id="pie" class="chart chart-pie" style="height:40px;"
  chart-data="pieChart.data" chart-labels="pieChart.labels"
  chart-colours="pieChart.colours"
  chart-options="pieChart.options">
</canvas>

Review the code snippet below:

$scope.pieChart = {};
$scope.pieChart.labels = ['Label 1', 'Label 2'];
$scope.pieChart.data = [10,20];
$scope.pieChart.colours = ['#1EF9A1', '#FD1F5E'];
// It is crucial to include this option!!!
$scope.pieChart.options =  {
  responsive: false,
  maintainAspectRatio: false
}

Answer №3

Utilizing the width and height attributes within the canvas tag is a helpful technique. Check out this example:

<canvas id="progress"
     height="200"
     width="200"
     class="chart chart-progress" 
     chart-data="progressData"
     chart-labels="progressLabels"
     chart-click="handleClick"
     chart-options="progressOptions">
</canvas>

Answer №4

I decided to enclose the canvas within a basic div container and assigned it a specific class name.

<div class="data-visualization">
<canvas ...></canvas>
</div>

Next, I specified the dimensions in my stylesheet using CSS rules.

.data-visualization {
width: 800px;
height: 500px;
}

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