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How to plot rectangular footprint around existing random data?

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Larissa Perez
Larissa Perez am 4 Dez. 2018
Kommentiert: KSSV am 7 Dez. 2018
This is the code which will generate random storm track length. Now, I have to plot just rectangtular footprint area around each storm track length. Here, storm track length will be the central width of the rectangle. The image below illustrates what I'd like to do.
Many thanks!!
N = 50; % Number of events
X = 50; Y = 50;
P1x = rand(N,1) * X; P1y = rand(N,1) * Y ; % initial point
L = lognrnd(2,0.7,[N,1]); % Sample track length
Theta = mod(normrnd(90,15,[N,1]),360); % Storm track bearing direction
dx = L.*cos(deg2rad(Theta - 90)); dy = L.*sin(deg2rad(Theta - 270));
P2x = P1x + dx; P2y = P1y + dy; % Final point
plot([0 X X 0 0],[0 0 Y Y 0]); hold on
plot(P1x,P1y,'ro'); plot([P1x P2x]',[P1y P2y]','-')
xlabel('X [km]'); ylabel('Y [km]');
xlim([-X/4 1.25*X]); ylim([-Y/4 1.25*Y])
xx.png

Akzeptierte Antwort

KSSV
KSSV am 4 Dez. 2018
N = 50; % Number of events
X = 50; Y = 50;
P1x = rand(N,1) * X; P1y = rand(N,1) * Y ; % initial point
L = lognrnd(2,0.7,[N,1]); % Sample track length
Theta = mod(normrnd(90,15,[N,1]),360); % Storm track bearing direction
dx = L.*cos(deg2rad(Theta - 90)); dy = L.*sin(deg2rad(Theta - 270));
P2x = P1x + dx; P2y = P1y + dy; % Final point
plot([0 X X 0 0],[0 0 Y Y 0]); hold on
plot(P1x,P1y,'ro');
plot([P1x P2x]',[P1y P2y]','-')
xlabel('X [km]'); ylabel('Y [km]');
xlim([-X/4 1.25*X]); ylim([-Y/4 1.25*Y])
%% Draw rectangles
Vx = [P1x P2x]' ;
Vy = [P1y P2y]' ;
t = 1./2 ;
% Loop to get normals
for i = 1:size(Vx,2)
N=LineNormals2D([Vx(:,i) Vy(:,i)]') ;
C = [[Vx(:,i) Vy(:,i)]+t*N ;
[Vx(:,i) Vy(:,i)]-t*N] ;
idx = boundary(C(:,1),C(:,2)) ;
plot(C(idx,1),C(idx,2),'b')
end
YOu can download the function LineNormals2D from the link.
  2 Kommentare
Larissa Perez
Larissa Perez am 7 Dez. 2018
Thank you so much for your help! :)
KSSV
KSSV am 7 Dez. 2018
thank you is accepting and voting the answer....
TSLA EJ

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