When using the evenodd fill rule, we can determine if a given point is inside or outside the boundary by drawing a ray from the point in any direction. See the Pen A Star Multiways by Dan Wilson ( on CodePen.Īs lines intersect we can get into situations where pieces seemingly on the inside can be considered outside the shape boundary. These two values help determine what is considered inside and outside the shape. The default value we have been using so far is nonzero, and the second option is evenodd. There is one more key piece to its puzzle according to the specification - the Fill Rule. Different shapes with fill rulesĪ polygon() is not just a collection of points. See the Pen 24w: Sliced Icon by Dan Wilson ( on CodePen. This example is two elements, each divided into a few rectangles. Combined with CSS Variables, we can work with overlapping elements and clip each one into alternating strips. It can also help us in slicing an element. See the Pen Multiple shapes from one clip-path by Dan Wilson ( on CodePen.ĭepending on how we lay it out we can make each shape directly, but since we know we can move around in the space beyond the element’s box, we can draw extra lines to help us get where we need to go next as needed. We can lean on this power of going beyond the bounds of our element to also create more than one visual shape with a single polygon(). See the Pen Octagon with four points by Dan Wilson ( on CodePen. Our earlier octagon can similarly be made with only four points. In this example the shapes used are all similar triangles defining three points, but due to exceeding the bounds for our element box we visually see one triangle and two pentagons. See the Pen CSS Shapes Know No Bounds by Dan Wilson ( on CodePen.īy going beyond the 0% - 100% range we can turn a polygon with three points into a quadrilateral, a pentagon, or a hexagon. Our element’s box model will be the ultimate boundary for a clip-path, but we can still define points that exist beyond that natural box for an element. However, we gain some flexibility by thinking outside the box - or more specifically when we think outside the range of 0% - 100%. It’s reasonable to look at the polygon() function and assume that we need to have one pair of x, y coordinates for every point in our shape. ) A shape with less vertices than the eye can see The visible area becomes the interior of the shape made by connecting these points with straight lines. In this case we start 30% into the width of the box for the first x and at the top of the box for the y and go clockwise. So for an octagon, we can set eight x, y pairs of percentages to define those points. See the Pen Clip Path Box by Dan Wilson ( on CodePen. While fixed units like pixels can be used when defining vertices/points (where the sides meet), percentages will give more flexibility to adapt to the element’s dimensions. Using the polygon shape function, for example, we can create triangles, stars, or other straight-edged shapes as on Bennett Feely’s Clippy. Everywhere in the element that is not within the bounds of our shape will be visually removed. Clip paths can apply a CSS Shape such as a circle(), ellipse(), inset(), or the flexible polygon() to any element. The basics of a clip pathīefore we dig into specific techniques to expand on clip paths, we should first take a look at a basic shape and clip-path. There are a few ways that we can use CSS Shapes, in particular with the clip-path property, that are not necessarily evident at first glance. CSS Shapes are getting a lot of attention as browser support has increased for properties like shape-outside and clip-path.
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