Rework the code that displays the text so that it fades in and fades out. Check out the CanvasGradient documentation for more. Instead of a solid black color, use a radial gradient for the ball.From here you can try the following additional exercises: In this tutorial you created a basic implementation of a Magic 8 Ball game using the Canvas API. When you save and reload the page and click the ball, you’ll see one of the phrases: The finished ball Conclusion You’ll draw the ball and the triangle first, and theįirst create a new file called 8ball.html and add the following code to define a basic HTML5 skeleton with a element in the tag:įunction drawBall ( words = "" )) The ball will consist of three elements: a black circle for the ball itself, a blue triangle to represent the area where the text appears, and the text itself. You can’t modify the canvas directly once you’ve drawn something, so each time you click, you’ll redraw the entire ball with new text. You’ll draw the ball using the Canvas API, and then use an event handler to display random text when you click the ball. You define a canvas element on the page, grab a reference to the element in JavaScript, and then use various API methods to draw lines, rectangles, and arcs to create shapes. The Canvas API lets you create 2D raster (pixel) graphics using JavaScript.
The end result will look like this: The finished ball When you’re done, you’ll have a Magic 8 Ball game that shows you answers when you click the ball. In this tutorial, you’ll do just that by using HTML, JavaScript, and the Canvas API. One of the additional challenges in the exercise is to implement this as a GUI application. In my book Exercises for Programmers, one of the exercises is to use arrays and random numbers to create your own Magic 8 Ball game:Ĭreate a Magic 8 Ball game that prompts for a question and then displays either “Yes,” “No,” “Maybe,” or “Ask again later.” You ask a “yes” or “no” question, shake the ball, and look at the answer it provides, which you see through a window on one side of the ball. The “Magic 8 Ball” is a toy shaped like the “8” ball in billiards, created in 1950.
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