For a path consisting of a five-pointed star, drawn with five connected straight line segments intersecting each other, the rule considers the inside to be the entire area enclosed by the star, including the pentagon in the center.
For a path composed of two concentric circles, the areas enclosed by both circles are considered to be inside, provided that both are drawn in the same direction. If the circles are drawn in opposite directions, only the "doughnut" shape between them is inside, according to the rule; the "doughnut hole" is outside. An alternative to the nonzero winding number rule is the even-odd rule.
This rule determines the "insideness" of a point by drawing a ray from that point in any direction and simply counting the number of path segments that cross the ray, regardless of direction.
If this number is odd, the point is inside; if even, the point is outside. This yields the same results as the nonzero winding number rule for paths with simple shapes, but produces different results for more complex shapes.
Figure 4. For the five-pointed star, the rule considers the triangular points to be inside the path, but not the pentagon in the center. For the two concentric circles, only the "doughnut" shape between the two circles is considered inside, regardless of the directions in which the circles are drawn. PDF page can be rotated before applying any draw operation. At any time page graphics state current font, font size, line color, fill color, line style, page rotation, clip area can be saved and then restored.
Save operation puts data to a graphics state stack, restore operation retrieves it from there. Current clip area limits the regions of the page affected by painting operators. It's a whole page initially. Styles can be used to store a set of graphic state parameters and apply it to a PDF page by one operation:.
Interactive Features. Made with by awesome contributors. This website is built using zend-expressive and it runs on PHP 7. We use cookies to allow you to dismiss dialogs such as the Laminas Project notification. Toggle navigation. Shape Drawing. But very good approximation. Text Drawing. Defaults to current locale. Example 3 Draw a UTFencoded string on the page.
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For simple convex paths, the nonzero winding number rule defines the inside and outside as one would intuitively expect. The more interesting cases are those involving complex or self-intersecting paths like the ones shown in Figure 4. For a path consisting of a five-pointed star, drawn with five connected straight line segments intersecting each other, the rule considers the inside to be the entire area enclosed by the star, including the pentagon in the center.
For a path composed of two concentric circles, the areas enclosed by both circles are considered to be inside, provided that both are drawn in the same direction. PDF reference describes this rule as follows: An alternative to the nonzero winding number rule is the even-odd rule.
If this number is odd, the point is inside; if even, the point is outside. This yields the same results as the nonzero winding number rule for paths with simple shapes, but produces different results for more complex shapes. Figure 4. For the five-pointed star, the rule considers the triangular points to be inside the path, but not the pentagon in the center.
PDF page can be rotated before applying any draw operation. At any time page graphics state current font, font size, line color, fill color, line style, page rotation, clip area can be saved and then restored. Save operation puts data to a graphics state stack, restore operation retrieves it from there. PDF and ZendPdf module support clipping of draw area.
Current clip area limits the regions of the page affected by painting operators. Styles can be used to store a set of graphic state parameters and apply it to a PDF page by one operation:. ZendPdf module supports transparency handling. Made with by awesome contributors. This website is built using zend-expressive and it runs on PHP 7. We use cookies to allow you to dismiss dialogs such as the Laminas Project notification.
Toggle navigation. Page size can be retrieved from a page object: 1 2.
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