Simple css drawing4/1/2023 O Tannenbaum, How Lovely Are Your Positioned Branches Then, create a file called tree.scss that we will be sure and import in the styles.scss. We’ll start by removing any and all tree styles from christmas.scss. Linear-gradient(80deg, darken($trunk-color,0%) 5%, transparent 5.5%), Linear-gradient($gradient-angel, darken($leaf-color,6%) 12%, transparent 12.5%), Linear-gradient($gradient-angel, darken($leaf-color,3%) 10%, transparent 10.5%), Linear-gradient(-$gradient-angel, darken($leaf-color,1.5%) 8%, transparent 8.5%), Linear-gradient($gradient-angel, darken($leaf-color,0%) 8%, transparent 8.5%), christmas background image: background-image: So, the tree is being drawn as multiple linear gradients on the. So what did we optimize? Well, let’s take a look at how the tree and snow are being drawn right now. Whereas after we optimize this bad boy, we'll see only an idle CPU in our future frames: It might not seem like that much painting, but if you scrub through the timeline, you’ll see that every frame has painting of some kind: It is often the longest-running of all tasks in the pipeline, and one to avoid if at all possible. Note: All of our tests will be ran at 6x slower CPU, even our final performant code, to compare evenly.Īs Paul Lewis explained in his article “Simplify Paint Complexity and Reduce Paint Areas”: Paint is the process of filling in pixels that eventually get composited to the users' screens. I slowed the CPU down 6x to to simulate a chugging MacBook (I would have put it lower if I could have). Here is a perhaps too detailed look at the performance behind the scenes: Note: For better legibility, some of our screenshots have DevTools undocked to a separate window. Specifically, the warnings in our performance panel went away! Hurray! However, we still have a painting problem. Paul Lewis & Paul IrishĪfter modifying the animation, we noticed performance improvements. Modern browsers can animate four things really cheaply: position, scale, rotation and opacity. If you can ever animate something using a transform or opacity change, DO IT. To summarize, though, instead of animating the background-position of the snow, we used transform translate to move the snow down the screen. I thought this article would be too much of a monster if I taught both drawing AND animating, so check that first part out for the animation portion. I wrote an article on how we fixed this called “Animating Performantly in CSS,” where we reanimate these things in a healthier way. Part of our performance problem was the way we were animating the falling snow. Not that my newest MacBook fared much better, the fans sounded like we were prepping to go into outer space when the animation ran for more than a few minutes. However, we had to comment out the animation and Christmas tree because it was causing our older MacBook laptop to crash. Now, we're going back to tackle the drawing aspect as well!Īs I mentioned in my last post, I found this lovely animation online and cleaned it up a bit for a Secret Santa app that me and my husband worked on for the holidays. That’s why pathLength="1" is so useful.In the last blog, we showed you how to improve animation performance in CSS with a holiday-themed example. Then here’s the key: animate the offset so it looks like the shape is drawing itself. But then you offset the stroke that far again so that it looks like there is no stroke at all. So imagine this: you make the dash (and space after the dash) so long that it covers the entire shape, so it appears as if didn’t dash the stroke at all. The trick itself, making the shape “draw itself” comes from the idea that strokes can be dashed, and you can control the length and offset of the dashing. That second line is going to make this trick very easy to pull off, as you’ll see in a moment. In our SVG, we’ll make sure we’ve set up that path nicely like this: Let’s say we have a single that draws a cool shape like this: A path can be a solid shape, but for our purposes here, let’s assume the path is fill: none and we’ll focus on the stroke of the path and having that path draw itself. With the path syntax, you can draw anything you want with its commands for drawing straight and curved lines. The best shape-drawing tool we have on the web is SVG, and in particular the element. But it doesn’t have to be! In fact, with remarkably little code and an awfully clever technique involving stroke dashes and offsets, we can do it on any SVG path. It looks like a little bit of magic to watch a shape draw itself on the web.
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