how to draw a line in html
Summary: in this tutorial, you'll acquire how to draw a line using the Canvas API.
Steps for drawing a line in JavaScript
To draw a line on a sail, yous use the following steps:
- Get-go, create a new line by calling the
beginPath()method. - Second, move the drawing cursor to the point
(x,y)without drawing a line by calling themoveTo(x, y). - Finally, depict a line from the previous point to the
point (x,y)past calling thelineTo(x,y)method.
Set the line stroke
If you want to stroke the line with the strokeStyle, you tin call the stroke() method afterwards calling the lineTo(x,y) method.
Set the line width
To set the width for a line, you use the lineWidth property of the 2D drawing context earlier calling stroke() method:
ctx.lineWidth = ten;
The lineTo(x,y) method
The lineTo(x,y ) method accepts both positive and negative arguments.
If thex is positive, the lineTo(x,y) method draws the line from the starting betoken to the right. Otherwise, it draws the line from the starting point to the left.
If they is positive, the lineTo(x,y) method draws the line from the starting point downwards the y-axis. Otherwise, it draws the line from the starting point up to the y-axis.
Drawing a line example
The following shows the index.html file that contains a canvas element:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-viii"> <meta proper name="viewport" content="width=device-width, initial-scale=1.0"> <title>JavaScript - Drawing a Line</title> <link rel="stylesheet" href="css/manner.css"> </head> <body> <h1>JavaScript - Drawing a Line</h1> <canvas id="canvas" height="400" width="500"> </sheet> <script src="js/app.js"> </script> </trunk> </html>
Code linguistic communication: HTML, XML ( xml ) And this app.js contains that draws a line with the color ruby-red, 5-pixel width from the point (100, 100) to (300, 100):
role draw() { const canvass = document.querySelector('#sail'); if (!canvas.getContext) { return; } const ctx = canvas.getContext('2nd'); // fix line stroke and line width ctx.strokeStyle = 'red'; ctx.lineWidth = 5; // draw a blood-red line ctx.beginPath(); ctx.moveTo(100, 100); ctx.lineTo(300, 100); ctx.stroke(); } draw();
Code language: JavaScript ( javascript ) The following shows the output:
Here is the link that shows the canvass with the line.
Develop a resuable drawLine() function
The following drawLine() function draws a line from one signal to another with a specified stroke and width:
function drawLine(ctx, begin, finish, stroke = 'black', width = 1 ) { if (stroke) { ctx.strokeStyle = stroke; } if (width) { ctx.lineWidth = width; } ctx.beginPath(); ctx.moveTo(...begin); ctx.lineTo(...cease); ctx.stroke(); }
Code language: JavaScript ( javascript ) To draw a line from (100,100) to (100,300) with the line color light-green and line width five pixels, you can telephone call the drawLine() function as follows:
const sheet = document.querySelector('#canvass'); if (canvas.getContext) { const ctx = sheet.getContext('2d'); drawLine(ctx, [100, 100], [100, 300], 'green', 5); }
Lawmaking language: JavaScript ( javascript ) Summary
- Use
beginPath(),moveTo(x, y)andlineTo(x,y)to draw a line. - Apply the
strokeStyleandlineWidthto set the line stroke and line width.
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Source: https://www.javascripttutorial.net/web-apis/javascript-draw-line/
Posted by: robertsonbeirch1984.blogspot.com
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