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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).
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.
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]
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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.
It considers regions with odd winding number to be inside the polygon; this is known as the even–odd rule. It takes two lists of polygons as input. In its original form, the algorithm is divided into three phases: In the first phase, pairwise intersections between edges of the polygons are computed.
You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.
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