How to make a select-able grid
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Anonymous Matrix
el 9 de Mzo. de 2017
Comentada: Mauricio Pereira
el 21 de Nov. de 2022
I need some guidance on how to make a selectable grid. I need to make a GUI that allows people to select a box on a grid over an image and make it change colors. So say I have a 25x25 grid over an image. if a person clicks on box 13,20 that box should change to blue. How do i do that?
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KSSV
el 9 de Mzo. de 2017
Editada: KSSV
el 9 de Mzo. de 2017
N = 25 ;
x = linspace(0,1,N) ;
y = linspace(0,1,N) ;
[X,Y] = meshgrid(x,y) ;
coor = [X(:) Y(:)] ;
I = imread('cameraman.tif');
image([0 1],[0 1],I)
hold on
plot(X,Y,'k') ;
plot(X',Y','k') ;
count = 0 ;
while count == 0
[x,y] = ginput(1) ;
idx = knnsearch(coor,[x y],'k',4) ;
% form bounding box
x0 = min(coor(idx,1)) ;x1 = max(coor(idx,1)) ;
y0 = min(coor(idx,2)) ;y1 = max(coor(idx,2)) ;
% square points
coori = [x0 y0 ; x0 y1 ; x1 y1 ; x1 y0 ; x0 y0] ;
patch(coori(:,1),coori(:,2),'b') ;
end
5 comentarios
Matus Drexler
el 23 de Mzo. de 2021
Hi.
Is it possible to select possition by e.g. mouse moving with left click?
Mauricio Pereira
el 21 de Nov. de 2022
Hello. How could I code for selecting multiple boxes of the grid at once? For example, click one box of the grid while leaving pressed down the mouse, and finally releasing it.
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