Plot a drawn, filled shape at each data point

14 vues (au cours des 30 derniers jours)
DrEamonn le 21 Mar 2019
Commenté : Star Strider le 22 Mar 2019
I have a matrix which contains X & Y data for seperate, single point locations to be plotted on a map using a marker for each point (kind of like multiple 'X marks the spot' on a map)
This works well until I scale the figure window & then the markers become a lot smaller than the data they represent.
How would I plot a filled unit square centred on each data point e.g. if the first point to be plotted is at (50, 10) I would like to draw a square (49.5, 9.5) (50.5, 9.5) (50.5, 10.5) (49.5, 10.5) & fil the square in a particular colour?

Réponses (3)

dpb le 21 Mar 2019
Modifié(e) : dpb le 21 Mar 2019
S=1; % Side size
X=50; Y=10; % location
xlim([X-5*S X+5*S]), ylim([Y-5*S Y+5*S])
grid on
  2 commentaires
DrEamonn le 21 Mar 2019
Solution is almost there, but position vectors have multiple values i.e.
X = [10 20 30]
Y = [15 10 5]
I have tried creating the w & h elements as w = ones(size(X)) & passing the rectangle function
rectangle( X, Y, w, h)
dpb le 21 Mar 2019
doc arrayfun
with anonymous function...
arrayfun(@(x,y) rectangle('Position',[x-S/2,y-S/2,S,S],'FaceColor'),'k',X,Y)
S is value set before definition.

Connectez-vous pour commenter.

DrEamonn le 21 Mar 2019
rectangles function appears to do what I need

Kelly Kearney
Kelly Kearney le 21 Mar 2019
A single multi-faceted patch will render more quickly than lots of individual rectangles. And this option allows your marker to be any arbitrary shape:
X = [10 20 30]
Y = [15 10 5]
xsquare = [0 0 1 1 0]';
ysquare = [0 1 1 0 0]';
hrect = patch(X+xsquare, Y+ysquare, 'k')
  2 commentaires
DrEamonn le 22 Mar 2019
Hi Kelly
I can see what you are suggesting to do, but I can't get it to work. Running your code gives me
Error using +
Matrix dimensions must agree.
Star Strider
Star Strider le 22 Mar 2019
If you’re using R2016a or earlier (so do not have ‘automatic implicit expansion’) you need slightly different code:
Xxsq = bsxfun(@plus, X, xsquare)
Yysq = bsxfun(@plus, Y, ysquare)
hrect = patch(Xxsq, Yysq, 'k')

Connectez-vous pour commenter.


En savoir plus sur Startup and Shutdown dans Help Center et File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by