Introduction
In this article, we are going to understand joining lines using an HTML 5 canvas. In this section, to set the line join style of an HTML5 Canvas path, we can use the lineJoin context property. Paths can have one of the three-line joins: miter, round, or bevel. Unless otherwise specified, the HTML5 Canvas line join property is defaulted with the miter style.
Here we will use some JavaScript and some styles along with HTML code. Just go through the steps to see how to create this application.
Let's see how the CanvasLineJoining application can be created. To do so use the following steps.
Step 1 : Open a HTML editor or Visual Studio.
Open File menu ->select new ->Choose Website
- Go to Solution Explorer
- Right-click on the Application name
- Select Add-->add new item
- Now in the window that opens, select an HTML page or a new Webform
- Rename it to Default.aspx
CSS Script
- <style>
- body
- {
- margin: 0px;
- padding: 0px;
- }
- Canvas
- {
- border: 2px solid #9C9898;
- margin-top: 50px;
- margin-left: 50px;
- background-color: #F4D19F;
- box-shadow: 5px 5px 8px #222;
- }
- .title
- {
- text-align: center;
- font-family: Segoe UI Light, Arial, Helvetica;
- font-size: 2.2em;
- margin: 1em;
- }
- .info
- {
- text-align: center;
- font-family: Segoe UI Light, Arial, Helvetica;
- font-size: 1.2em;
- margin: 0.25em;
- }
- </style>
Step 3: In this part, we need to work on some JavaScript. To fully understand how JavaScript works, download the attached .rar file and run the CanvasLineJoining application.
The whole JavaScript looks as in the following:
- <script>
- window.onload = function ()
- {
- var canvas = document.getElementById("myCanvas");
- var context = canvas.getContext("2d");
- // miter line joine (left)
- context.beginPath();
- context.moveTo(canvas.width / 2 - 50 - 140, canvas.height - 50); // line 1
- context.lineTo(canvas.width / 2 - 140, 50); // line 1
- context.lineTo(canvas.width / 2 + 50 - 140, canvas.height - 50); // line 1
- context.lineWidth = 25;
- context.lineJoin = "miter";
- context.stroke();
- // round line join (middle)
- context.beginPath();
- context.moveTo(canvas.width / 2 - 50, canvas.height - 50); // line 1
- context.lineTo(canvas.width / 2, 50); // line 1
- context.lineTo(canvas.width / 2 + 50, canvas.height - 50); // line 1
- context.lineWidth = 25;
- context.lineJoin = "round";
- context.stroke();
- // bevel line join (right)
- context.beginPath();
- context.moveTo(canvas.width / 2 - 50 + 140, canvas.height - 50); // line 1
- context.lineTo(canvas.width / 2 + 140, 50); // line 1
- context.lineTo(canvas.width / 2 + 50 + 140, canvas.height - 50); // line 1
- context.lineWidth = 25;
- context.lineJoin = "bevel";
- context.stroke();
- };
- </script>
Join the conversation! Your thoughts help the community grow.