HTML Canvas Tutorial

HTML Canvas facilitates the element <canvas> to draw graphics on Canvas with the help of JavaScript. HTML Canvas offers various methods for drawing different shapes and lines. The HTML Canvas is a rectangular area defined via height and width on an HTML page. By default, HTML Canvas has no border and no content.

Note: To specify the canvas area, canvas provides two attributes: height and width. By default, the width and height of the value are 300px and 150px respectively.

What is HTML Canvas

HTML Canvas uses <canvas> element to draw the graphics. JavaScript is essential for drawing graphics on HTML Canvas. We can draw different types of shapes and lines including Canvas Lines, Canvas Rectangle, Canvas Circle, Canvas Curves, Canvas Gradients, Canvas Text, Canvas Images, etc.

The following list provides a comprehensive guide for drawing on the canvas.

Canvas Basics

• Canvas Drawing
• Canvas Coordinates
• Canvas Lines
• Canvas Shapes
• Canvas Rectangle
• Canvas Circle
• Canvas Curves
• Canvas Gradients
• Canvas Text
• Canvas Images

Canvas Properties

• fillStyle property
• strokeStyle property
• shadowColor property
• shadowBlur property
• ShadowOffsetX property
• ShadowOffsetY property

Canvas Methods

• createLinearGradient() method
• createPattern() method
• addColorStop() method

Line Styles Properties

• lineCap property
• lineJoin property
• lineWidth property
• miterLimit property

Rectangles Methods

• rect() method
• fillRect() method
• strokeRect() method
• clearRect() method

Paths Methods

• fill() method
• stroke() method
• beginPath() method
• moveTo() method
• closePath() method
• lineTo() method
• clip() method
• quadraticCurveTo() method
• bezierCurveTo() method
• arc() method
• arcTo() method
• isPointInPath() method

Transformations Methods

• scale() method
• rotate() method
• translate() method
• transform() method
• setTransform() method

Text Properties and Methods

Property

• font property
• textAlign property
• textBaseline property

Method

• fillText() method
• strokeText() method
• measureText() method

Pixel Manipulation

Property

• width property
• height property

Methods 

• createImageData() method
• getImageData() method
• putImageData() method

Compositing & Image Drawing

Properties

• globalAlpha property

Method

• drawImage() method

Reasons to Learn HTML Canvas

• Canvas is used mostly in game development, it is essential to learn for creating web-based games.
• HTML Canvas allows you to create responsive graphics and visuals for different screen sizes.
• Canvas can also be used for visualizing data through charts, graphs, and diagrams.

Usage of HTML Canvas

• Drawing Graphics: HTML Canvas is used for drawing 2D graphics and render it directly in the web browser.
• Game Development: HTML Canvas provides platform for building interactive and dynamic 2D games on the web.
• Chart and Data Visualization: HTML Canvas is used to draw charts, graphs, and different types visual representations of data.

FAQs on HTML Canvas

Q1. What is HTML Canvas?

Ans. The HTML Canvas provides a drawing surface and using JavaScript we can create interactive and visually appealing content.

Q2. What is the size of HTML Canvas by default?

Ans. The HTML Canvas has a default width of 300px and a height of 150px.

Q3. How can I draw shapes on the canvas?

Ans. To draw rectangles, lines, and arcs we can use methods like fillRect(), strokeRect(), and arc() respectively.

Q4. How do I make a transparent canvas in HTML5?

Ans. The HTML Canvas are transparent by default.

Q5. How do I clear the entire canvas?

Ans. The method clearRect() is responsible to clear a specified rectangular area from coordinates (0, 0) to the canvas width and height.