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The SVG defines the even–odd rule by saying: This rule determines the "insideness" of a point on the canvas by drawing a ray from that point to infinity in any direction and counting the number of path segments from the given shape that the ray crosses. If this number is odd, the point is inside; if even, the point is outside.
The original image didn't seem to be displaying, so I re-saved it as a normal SVG rather than an Inkscape SVG. Fingers crossed... 08:54, 3 April 2011: 1,618 × 1,541 (9 KB) Fuzzypeg {{Information |Description ={{en|1=Diagram showing how a curve (top) is filled according to two rules: the even-odd rule (left), and the non-zero winding rule (right).
If the point is on the inside of the polygon then it will intersect the edge an odd number of times. The status of a point on the edge of the polygon depends on the details of the ray intersection algorithm. This algorithm is sometimes also known as the crossing number algorithm or the even–odd rule algorithm, and was known as early as 1962. [3]
A curve (top) is filled according to two rules: the even-odd rule (left), and the non-zero winding rule (right). In each case an arrow shows a ray from a point P heading out of the curve. In the even-odd case, the ray is intersected by two lines, an even number; therefore P is concluded to be 'outside' the curve.
Sometimes, using a symbolic image to convey a concept is more impactful than words. This page compiles examples of such images along with their corresponding files, making them easy to copy and use. You are welcome to utilize these examples and, if you wish—while accepting full responsibility—contribute to expanding this collection.
This is accomplished by evaluating the even–odd rule at the first vertex, which allows you to know whether the first vertex is inside or outside the other polygon. Then, following the polygon's borders, the intersections are marked with alternating flags (the next intersection after an entry intersection must be an exit intersection).
Images in this category have unnecessary borders and/or opaque or translucent space around the subject of the image that need to be removed. Where borders are desired they should usually be added with article markup such as table markup. If cropping a JPEG, consider using a lossless cropping tool such as jpegtran.
Openclipart, also called Open Clip Art Library, is an online media repository of free-content vector clip art. The project hosts over 160,000 free graphics and has billed itself as "the largest community of artists making the best free original clipart for you to use for absolutely any reason".