pointPolygonTest

Version 1.0.0 (79.5 KB) by cui
determine points are inside, on or outside a polygon/contour or calculate signed distance between points and the nearest contour edge.

8 Downloads

Updated 23 Oct 2022

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Points In Polygon Test

This function inpolygon2 is an enhancement of matlab's built-in function inpolygon, which supports the calculation of the distances.Support C/C++ code generation.

Example

%% data, is same as https://www.mathworks.cn/help/matlab/ref/inpolygon.html fisrst Example
L = linspace(0,2*pi,6);
xv = cos(L)';
yv = sin(L)';

rng default
xq = randn(250,1);
yq = randn(250,1);

%% use inpolygon2 function determine points whether inside polygon 
points = [xq,yq];
dists = inpolygon2([xv,yv],points);

figure;hold on
plot(xv,yv) % polygon
plot(xq(dists==1),yq(dists==1),'r+') % points inside
plot(xq(dists==-1),yq(dists==-1),'bo') % points outside
axis equal;
title("points in polygon")

img

%% Distance Rating Heat Map
xy=-2:.02:2;
[x,y] = meshgrid(xy);
points = [x(:),y(:)];
dists2 = inpolygon2([xv,yv],points,true);
dists2 = reshape(dists2,size(x));

figure;hold on;
xydata = [xy(1),xy(end)];
imagesc(xydata,xydata,dists2)
plot(xv,yv,'w-','LineWidth',2)
colormap('jet');
colorbar
axis equal off
title("signed distance hot map")

img

Cite As

cui (2023). pointPolygonTest (https://github.com/cuixing158/pointPolygonTest/releases/tag/v1.0.0), GitHub. Retrieved .

MATLAB Release Compatibility
Created with R2022b
Compatible with any release
Platform Compatibility
Windows macOS Linux
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Version Published Release Notes
1.0.0

To view or report issues in this GitHub add-on, visit the GitHub Repository.
To view or report issues in this GitHub add-on, visit the GitHub Repository.