If(bar.x+dxBar canvas.width || circle.x +dx bar.y & circle.x>bar.x & circle.x canvas.height || circle.y +dy bar. var canvas Ĭtx.arc(c.x, c.y, c.r, 0, Math.PI*2, true) Place the following JavaScript code in a file named bouncingball.js. This gives the illusion that the ball is moving continuously. It will clear the entire canvas and update x and y coordinates of the ball. In our case, a custom draw() function will be called every ten milliseconds. So, to make an object move on canvas you need to call a function periodically that clears the canvas and updates the position of the object. We already know that whatever you draw on canvas persists until you clear it. We will use the setTimeout() function to create the animation. You need to catch the ball with a paddle when it reaches the bottom of the screen. This example will create an application containing a bouncing ball. Var img = document.getElementById("myimage") įor a complete tutorial about drawing basic shapes you can refer to the Mozilla Developer Network documentation. var ctx = document.getElementById("canvasDemo").getContext("2d") In JavaScript we can access it by id and draw it as shown below. var ctx = document.getElementById("canvasDemo").getContext("2d") Īnother way is to add an image to your document and make it invisible. You can create an Image object and draw it on the canvas as shown below. The modified canvas is shown in the following figure.ĭrawing an image on canvas is pretty easy. var canvas=document.getElementById("canvasDemo") As a result if you want to alter anything on the canvas, you will probably have to redraw the whole thing. It should be noted that elements do not maintain any DOM. The code draws a straight line from coordinate (30, 40) to (145, 120), with the upper left corner of the canvas acting as coordinate (0, 0). The following example shows how to draw a line on the canvas. From JavaScript we can access the element as shown below. This acts as a fallback for older browsers. Whatever you write inside the tag will appear if the browser does not support canvases. The height and width attributes are used to size the canvas. The id attribute is used so that we can access the element from JavaScript. Sorry, your browser does not support canvas. Current versions of Mozilla Firefox, Chrome, Opera, Safari, and IE 9 and 10 all support the element. Now it has been adopted by every major browser. In this tutorial you will learn about some of the basic operations supported by the element and create a simple animation using JavaScript.Ĭanvas was first introduced by Apple in 2004 for use in Mac OS X and Safari. We could bring these in as images, SVG or PNG, but theyre just going to be fairly simple circles, so we can just draw them using CSS pseudo elements like. Lollipop example on Codepen.The element, introduced in HTML5, allows developers to dynamically create bit map graphics using JavaScript. Linear-gradient(90deg, red, white 15%, red 50%, darkred) įinal Result: Single Div CSS Lollipop DrawingĪnd there you have it, we’ve made our first single div drawing. Here’s a simple example of how that works with a paragraph element:īackground-image: radial-gradient(farthest-corner at 35px 25px, white, red, darkred) īackground-image: linear-gradient(90deg, lightgray, white 25%, darkgray) īackground-image: linear-gradient(darkred, white 2%, transparent 15%, transparent 90%, darkred), By default, the pseudo-elements are added inline. Selectors have a ::before pseudo-element that inserts content before the selector’s content, and an ::after pseudo-element that appends content after the selector’s content. There are three main techniques commonly used for building up the layers in a single div drawing. Many, many layers for the more complex and intricate drawings. The Basics of Single Div DrawingĪt it’s core, single div drawing is just drawing in layers. However, before I jump into the steps I took to create the lollipop, there are several basics to single div drawing I want to cover first. I will walk you through how I created my first single div drawing: a lollipop. I made a mental note to give this a try, and here I am two years later with something to finally share. No JavaScript and the only HTML element on the page was a div with no content! This was both a humbling and a mind-blowing experience. Then I realized she created the animated drawing using pure CSS. I didn’t know single div drawing was a thing until about two years ago when I came across a tweet from It took me to this codepen she wrote and I was impressed. Hopefully by the time you reach the end of it, you will be motivated to express your artistic creativity using CSS as your medium. The goal of this blog post is to introduce you to the world of single div drawing. In this tutorial, you’ll learn the basic building blocks of single div drawing with CSS, putting them all together at the end to draw a lollipop.
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