[Beginner] Constructing a rectangle object and detecting points inside

Hello,

On a 2D environnement, I would like to create a rectangle object.

This being done, I would like to be able to detect from a vector of points (x,y), which one are inside the rectangle area and which one are outside.

Could someone help me please? :D

Answer 1

[Cris LaPierre]

Independently, I'd suggest the rectangle and inpolygon functions. However, to find the points inside the rectangle, I'd use patch instead of rectangle, since it gives you access to the x and y values of the shape.

x=4*rand(1,10)+1;
y=2*rand(1,10)+2;

% view data
scatter(x,y)
hold on
p = patch([2,4,4,2],[2 2 4 4],nan);
axis([1 6 1 5])

% find data points inside rectangle
in=inpolygon(x,y,p.Vertices(:,1),p.Vertices(:,2));

% replot data inside shape, this time filled in
scatter(x(in),y(in),'filled')
hold off

[Baptiste Labarthe]

Super, thanks !