polygon

问题 How do I write a shader to draw a polygon in solid color and it's border in a different color. Basically I have a hexagons map in 3d and I need to be able to outline each hexagon with a black border, if user requests so. Would also be nice if I could control border width. Thanks. 回答1: Off the top of my head, one way would be to create a your hex with a 7th vertex in the center 1---2 /\ /\ / \ / \ 6----0----3 \ / \ / \/ \/ 5---4 Add texture coordinates where point 0 has UV = { 0, 0 } and

问题 I was wondering if it was possible to draw the edges of a rendered polygon with a specific color using a fragment shader, as in this example picture: Or should I just render those separately? 回答1: See work related on this page: http://web.archive.org/web/20120527185124/http://cgg-journal.com/2008-2/06/index.html A vertex shader should render polygons where the distance to each edge is colored. The difference between coloring each "cell" is explained in much detail. 来源： https://stackoverflow

问题 I am trying to create a single point within a polygon using a class for use in an agent based model. Currently I am able to create random points constrained to the bounds of the polygon, but not the polygon itself. My code at present appears to ignore the if statement within the while loop. I am very new to python so this could be a limitation I am missing. Here is my current code: import geopandas as gpd import matplotlib.pyplot as plt import random import pandas as pd bounds = gpd.read_file

问题 I am trying to create a single point within a polygon using a class for use in an agent based model. Currently I am able to create random points constrained to the bounds of the polygon, but not the polygon itself. My code at present appears to ignore the if statement within the while loop. I am very new to python so this could be a limitation I am missing. Here is my current code: import geopandas as gpd import matplotlib.pyplot as plt import random import pandas as pd bounds = gpd.read_file

问题 I'm trying to create a pyramid. I figured I'd use the CSS clip-path for that. I meant to do a triangle (which I managed to do) and several trapezoids beneath it (even the first one failed). .container { min-width: 50%; max-width: 50%; } .triangle { background-color: yellow; clip-path: polygon(90% 100%, 50% 0%, 10% 100%); } .trapeze { background-color: blue; clip-path: polygon(0% 10%, 0% 90%, 0% 100%, 100% 100%); } div { min-height: 200px; max-height: 200px; border-color: black; border-style:

问题 I have the Polygon data from the States from the USA from the website arcgis and I also have an excel file with coordinates of citys. I have converted the coordinates to geometry data (Points). Now I want to test if the Points are in the USA. Both are dtype: geometry. I thought with this I can easily compare, but when I use my code I get for every Point the answer false. Even if there are Points that are in the USA. The code is: import geopandas as gp import pandas as pd import xlsxwriter

问题 I've been trying to carry out line simplification on polygons belonging to maps with the help of this CGAL guide, e.g. South Korea. This is a screenshot of South Korea after line simplification with CGAL. I carried out the line simplification by adding each polygon to CGAL::Constrained_triangulation_plus_2<CDT> ct and then running CGAL::Polyline_simplification_2::simplify(ct, Cost(), Stop(0.5)); . The outer boundaries will get simplified but the inner/shared boundaries (between provinces)

问题 I have a two data frames: points contains a series of points with x, y coordinates. poly contains coordinates of two polygons (I have over 100 in reality, but keeping it simple here). I want to be able to add to the dataframe points an extra column called Area which contains the name of the polygon the point is in. poly <- data.frame( pol= c("P1", "P1","P1","P1","P1","P2","P2","P2","P2", "P2"), x=c(4360, 7273, 7759, 4440, 4360, 8720,11959, 11440,8200, 8720), y=c(1009, 9900,28559,28430,1009

问题 So I have a map here How can I, using Google Maps API, detect whether or not a given coordinate is within that polygon? Is that possible? Thanks in advance. 回答1: Yes it is possible. See this function: http://github.com/tparkin/Google-Maps-Point-in-Polygon 回答2: Google provides one already var bermudaTriangle = new google.maps.Polygon({ paths: [ new google.maps.LatLng(25.774, -80.190), new google.maps.LatLng(18.466, -66.118), new google.maps.LatLng(32.321, -64.757) ] }); google.maps.event

问题 I use to plot maps of Belgium available on GADM (select Belgium) using R. I import and plot the outside boundary of Belgium using : belgium <-readRDS("gadm36_BEL_0_sp.rds") plot(belgium) Which gives me : I import and plot the boundaries of provinces of Belgium using : provinces <-readRDS("gadm36_BEL_2_sp.rds") plot(provinces) Which gives me : What i'm trying to have is a dataframe with boundaries of provinces that are NOT outside boundaries of Belgium : I tried using over() , intersect() ,