![]() To build on this, you can create line charts, bar charts, etc. This will be used to set where the next slice will start.įor the colors, we style the portion with the corresponding mood’s color using the fill() method. We set the current angle to where angle the portion consumed. We then draw an arc and a line to the center to differentiate the slice from the rest. We start from 0° to 360° in an anticlockwise fashion. We have a for/of loop where we start by calculating the angle the slice (portion) will take in the chart using this formula: (total number of people containing a mood / total number of people) * 360° filling the slices with the corresponding mood's color arc( 100, 100, 100, currentAngle, currentAngle + portionAngle) drawing an arc and a line to the center to differentiate the slice from the restĬtx. calculating the angle the slice (portion) will take in the chart beginPath() is used to start a new path while the moveTo() creates a point (a ‘from’ coordinate) which will be joined by the lineTo() method. It is used together with the beginPath() and moveTo() to create a line. This method is used to draw a straight line. In our case for the pie chart, we will use the fill() method. We also stroked it to give it the black line. It starts from 0°, in our case, in a counterclockwise manner that’s why our 90°( Math.PI(π)/2) is located at the bottom. NOTE: We use the radians method to denote our angles where Math.PI(π) is 180°. If false, it draws it in a clockwise manner. It is counterclockwise by default ( true). We then have an optional boolean value for the direction our arc will follow between the two angles. ![]() We pass in the center’s x and y coordinates, the radius’ length, and the angles where the arc will start and where it will end. arc( center - x - coordinate, center - y - coordinate, arc - radius - length, startAngle, endAngle ) You can declare a simple canvas element as shown in the line below: A canvas is a single DOM element that gives us a way to draw shapes on a node’s space using its provided drawing interface and methods. If you are interested in SVG, you can read more about it here. This article focuses on the canvas, so we won’t go further into SVG. That being said, there are two other options provided:Īs the name suggests, SVG is used to create vector graphics in XML format. But, some operations like drawing lines between two or more locations, are particularly difficult to accomplish with standard HTML components. It’s easy to position, give custom shapes and color to items in the DOM using the CSS styling provided. ![]() To follow along, you will be required to have a basic understanding of these programming languages: This tutorial will take you through how to do that using JavaScript, HTML Canvas, and CSS. Sometimes, you may want to create a chart without any library. ![]()
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