Building a Graphing Calculator with HTML5

TL;DR

Learn how to create a graphing calculator from scratch using HTML, JavaScript, and the canvas element.

Transcript

hi everybody Tom Curren today we are going to build from scratch a graphing calculator where you can type in a mathematical function and it will plot it for you so let's open up jsbin just go to jsbin comm and also why don't you open up this github repository so here I have some examples that we'll be drawing from throughout the course this and I'l... Read More

Key Insights

• 🌐 JSBin is a site that lets you type code in the browser and every time the text changes it reevaluates the code. Ctrl + Left Bracket or Right Bracket should be used to indent and uninvent code on this platform.

Questions & Answers

Q: How can you access the canvas element using JavaScript?

To access the canvas element using JavaScript, you can use the document.getElementById() method and pass in the ID of the canvas element.

Q: What are some advantages of using the canvas element for drawing over other HTML elements?

The canvas element allows for more powerful and flexible drawing capabilities compared to other HTML elements. It provides access to the canvas API, which includes functions for drawing lines, circles, and text, as well as changing colors and styles.

Q: How can you debug and inspect the canvas element in the browser?

You can use the developer tools in the browser to inspect and debug the canvas element. In Chrome, you can open the developer tools by right-clicking on the page, selecting "Inspect", and then going to the "Elements" tab. From there, you can hover over the canvas element and view its properties.

Q: How can you draw a rectangle on the canvas using the canvas API?

To draw a rectangle on the canvas, you can use the fillRect() function from the canvas API. You pass in the x and y coordinates of the top-left corner of the rectangle, as well as its width and height in pixels.

Q: What is the purpose of the canvas context in JavaScript?

The canvas context, accessed using the getContext() function, allows you to interact with the canvas element and perform drawing operations. It provides methods for drawing shapes, changing styles, and manipulating the canvas.

Summary & Key Takeaways

• The tutorial teaches how to build a graphing calculator using HTML, JavaScript, and the canvas element.

• It starts by explaining how to set up the HTML template and the canvas element.

• The tutorial then covers how to use the canvas API to draw and animate mathematical functions on the canvas.