polygon

I have created a method that draws an octagon, and it works well, as long as the size is 200 or higher public static void FillOctagon(PaintEventArgs e, Color color, int x, int y, int width, int height) { e.Graphics.SmoothingMode = SmoothingMode.AntiAlias; var points = new [] { new Point(((x + width) / 2) - (width / 4), y), //side 1 new Point(x, ((y + height) / 2) - (height / 4)), //side 2 new Point(x, ((y + height) / 2) + (height / 4)), //side 3 new Point(((x + width) / 2) - (width / 4), y + height), //side 4 new Point((x + width) - (width / 4), y + height), //side 5 new Point(x + width, ((y +

I develop a web-based application where a user will create a polygon on a map and the database will return points of interest. The problem is that the postgreSQL saves the polygon in a different way than google map polygon. So how I can save the user polygon to postgis? I already use google maps v3 api and geojson Some code would be useful. In the absence of that here's a best guess generic answer: In general terms you will need to work out how to map (convert) each format to the other. Then you can convert to the format suitable for the database before you save and convert from database

I really need some urgent help with this problem. I have a set of edges and vertices defining a polygon (not necessarily convex). The vertices and edges are in random order and I want to sort/order the vertices of this polygon in clockwise (or anti-clock wise) direction. please see this page for more detailed description: http://www.dixittech.com/blog/2012/10/28/sorting-vertices-of-a-polygon-in-ccw-or-cw-direction/ Any idea how this can be achieved? I think this is a simplified version of Königsberg Bridge Problem essentially. if there's no any case that more than two edges are connected at a

Say, I have a sprite of a game object which is a png image with transparency. I want to create a polygon from this image which will contain my game object. I am pretty sure there is an existing algorithm for it, but I haven't found any. I expect something like: public static Polygon getPolygon(BufferedImage sprite) { // get coordinates of all points for polygon return polygon; } See this question . It will be slow, but it depends on how accurate you want it (second answer is sloppier, but a bit faster). After you get the Area from getOutline() on the other question, try using this code

I need a parallel SVG path. I have path as 'M0 0 H50 A20 20 0 1 0 100 50 v25 C50 125 0 85 0 85 z'. Let Offset be 2px. Original Path O/P: Path Image Path Segments when further divided: 0: ["M", 0, 0] 1: ["H", 50] 2: ["A", 20, 20, 0, 1, 0, 100, 50] 3: ["V", 75] 4: ["C", 50, 125, 0, 85, 0, 85] Any algorithm or way to find the offset path for individual segments or on whole?? Updated Image: Red lines represent the offset SVG image, I need to get. Example Offset SVG Path Algorithmic solution Offsetting lines is relatively trivial. For arcs, it is solvable by changing both radii by the same value.

I had a problem where white pixels appeared randomly (sort of) on objects in OpenGL. This is an example of what was going on. While searching Stack Overflow for other people who may have had this problem, I found that GL_POLYGON_SMOOTH wasn't worth enabling. I disabled it, and the spots disappeared (this was lucky of me). This was very lucky, but I still don't understand why enabling GL_POLYGON_SMOOTH creates these artifact-thingies. Can someone explain why they appear? Also note I had glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) going on. GL_POLYGON_SMOOTH is selective anti-aliasing, as