height // Image Data (RGBA) var imagedata = context. getContext ( "2d" ) // Width and height of the image var imagew = canvas. getElementById ( "viewport" ) var context = canvas. Get the canvas and context var canvas = document.
The iterate function calculates and draws an appropriate color to the ImageData object, which will be drawn to the canvas at a later time. For every pixel in our canvas, we apply an iterate function and we define a maxiterations parameter. This allows us to draw pixels on the canvas. We get the canvas and create an ImageData object, as explained in my tutorial Drawing Pixels With HTML5 Canvas And JavaScript. Here is the first part of a method to draw the Mandelbrot fractal on a canvas. In any case, we will have to make a trade-off. If we allow a higher number of iterations, our images will have more detail, but the time it takes to calculate the image will be higher as well. Some calculations might take an infinite amount of time to finish, so we must limit the number of iterations that are allowed per pixel. Based on how many iterations are needed, we can define a color. Drawing Mandelbrot Fractals With HTML5 Canvas And JavaScriptĬlick here to go directly to the end of this article and view the demo.įor every pixel on the screen, we need to make repeated calculations, also called iterations, to determine if the value belongs to the Mandelbrot set or not.
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