polygon

I have an edge of a polygon (convex or concave). I want to find out if, going straight from start to end point of that edge, I have to turn right or left to get inside or outside of polygon. How can I check that? Traverse the whole polygon in that direction. If you find that you went clockwise, then the interior is to the right; if you went counter-clockwise, it's to the left. Another approach: Project a perpendicular line and count how many times it crosses other edges. odd -> interior zero or even -> exterior Equivalently If you happen to have a well optimized point-in-polygon routine

So I have a DrawStar class that draws a star using Polygon like that: public void paintComponent(Graphics g) { Graphics2D g2 = (Graphics2D) g; int[] cX = new int[] {x, x+5, x+20, x+8, x+16, x, x-16, x-8, x-20, x-5, x}; int[] cY = new int[] {y, y+14, y+14, y+22, y+39, y+29, y+39, y+22, y+14, y+14, y}; Polygon pol = new Polygon(cX, cY, 11); g2.setColor(this.color); g2.draw(pol); g2.fillPolygon(pol); } Then in my main class I create a JPanel frame to draw the stars: ... JFrame starsframe = new JFrame(); starsframe.setTitle("Random stars..."); starsframe.setSize(600, 400); starsframe

I've got 8 points that create the outline of an eight-sided polygon in two-dimensional space. I need to find the area enclosed be these points, but how do I do that using matlab? The eight points (x,y) are contained in the 8x2 matrix B. B = [ 260 455; 1187 467; 1325 605; 1342 1533; 1207 1675 251 1690; 107 1547; 116 593]; The polygon is created by drawing straight lines from the point which is row 1 to row 2, then row 2 to row 3 and so on... You can use polyarea : ar = polyarea(B(:, 1), B(:, 2)); I would go with trapezoid : Area = trapz(B(:,1),B(:,2)); For calculating area and even volume you

I've been banging my head against the wall all morning with this one. I an creating an array of polygons, and want to associate some data in each one that will show in an infoWindow. I can see all the polygons on the map. I add the listener, and it fires (the color change happens), but I don't get the infoWindow. Any help would be greatly appreaciated! Cheers! C... tmppoly = new google.maps.Polygon({ map: map, paths: polypath, strokeColor: scolor, strokeOpacity: 0.5, strokeWeight: 2, fillColor: fcolor, fillOpacity: 0.5 }); addPolygonClick(tmppoly,mdata); plot_polygons.push(tmppoly); ...

I am new to R and for my currently project, I have to draw a heat map related to a specific event. There are around 2 million observations of such event and in each observation there is a long and lat coordinate. Also, I have converted the map data to a data frame and the data frame contains 71 district, each district is defined with a set of coordinates. I need to decide which observation of the event belongs to which district. I am using the following code: for (row in 1:nrow(data2015)){ point.x=data2015[row,"Latitude"] point.y=data2015[row,"Longitude"] for (name in names(polygonOfdis)){ if

I am working with a huge area, 7 states of forest and nonforest using the NLCD data. Within some of the forested areas is a plot (this is my master's thesis I am working on). I have stumped everyone I have asked with this large dataset but we are certain there is a resolution out there. The forest/nonforest area is a signed and discrete raster. I was able to make the forested area into polygons by subsetting out the forested area. I am not able to make the nonforest area into polygons (too large). So I was trying to get point distance (the point is within the polygon) to the edge of the

I have a matrix (named ichimoku) with 516 rows and 2 columns ,each one of them containing values to be plotted, the goal is to recreate the clouds for the Ichimoku strategy . Using matpot, I am able to plot these two curves but what I want is to shade the area between the two curves. I have two problems : I tried using polygon to shade the area but it does not work. I suspect it is because the two series (senkouA and senkouB) cross several times on the plot instead of having one always greater than the other I would like the area to be shaded in green if senkouA>senkouB and in red if senkouB