need help with pointer movement on grid

I have a grid,say 150*150m with each cell 0.5*0.5m making it a grid of 300*300 cells. I want to move pointer in a random arc path such that the pointer covers each cell (cell should be covered completely) in time steps( if that can be included as well) along its path. The pointer dimensions 1*1m (i.e. spanning 2*2cells in either direction). i need help with coding it.

[Walter Roberson]

When moving from one location to another, what are the allowed changes in position? For example is it only permitted to move left, right, up, down, by one unit? Or is it permitted to move diagonally by one? Is it permitted to move more than one cell at a time? Is it permitted to move back to where it was immediately previously? Is it permitted to move back to somewhere it has been before? Is each location to be visited exactly once, so the 300*300 grid would be completely covered in exactly 90000 steps?

Answer 1

[KSSV]

clc; clear all ;
% N = 300 ; M = 150 ;
N = 100 ; M = 50 ;
[X1,Y1] = MeshRectanglularPlate(150,150,N,N)  ;
[X2,Y2] = MeshRectanglularPlate(150,150,M,M)  ;
nel = size(X2,2) ;
Ele = 1:nel ;
for i = 1:nel
    % pick one element randomly
    ele = randsample(Ele,1) ;
    patch(X1,Y1,'w') ;
    hold on
    patch(X2(:,ele),Y2(:,ele),'r')
    hold off
    % remove the elemnet picked
    Ele = setdiff(Ele,ele) ;
    pause(0.5)
end

download the function MeshRectanglularPlate from the link: http://in.mathworks.com/matlabcentral/fileexchange/33731-meshing-a-plate-using-four-noded-elements/content/Plate%20Mesh/MeshRectanglularPlate.m

[h b]

showing 'Error using patch. vectors must be the same length'

[KSSV]

which line? It worked fine for me.....did you use the function?

[h b]

two diff grids are displayed but no pointer is being shown

[KSSV]

Are you taking a fine grid? Try to use a coarse one....like I have used 100 and 50. I get something like the image shown for one step.

[h b]

error being showed in line- patch(X1,Y1,'w');

[KSSV]

what error? what version you are using?

[h b]

MATLAB Version: 9.1.0.441655 (R2016b)

[KSSV]

YOu have not specified what error it is..you may also try fill instead patch

[h b]

same is being displayed with fill. 'Error using fill Vectors must be the same length' i will check again..

[KSSV]

What is size of X1 and Y1? Earlier you said two grids are shown and no pointer.

[h b]

Following sizes

X1 = 10201x2 double ; Y1 = 10000x4 double X2 = 2601x2 double ; Y2 = 2500x4 double

input as per your code.

output

i am getting two figures with grid shown without any pointer as well as the error message in the line patch(X1,Y1,'w') ;

[KSSV]

There is a error....sizes of X1 and Y1 should be same...same is case with X2 and Y2. Hey, I apoologize, I made changes to the function....you use this function. ;).

[h b]

it worked. Thank you so much sir.

[h b]

Here, is it possible for the pointer to move in a path(straight/arc) cell-by-cell?

[KSSV]

In the present code, pointer moves randomly..if you want in a path, you have to specify the path first and then follow the path.

[h b]

1. i am unable to move pointer(having dimension 2cells*1cell) cell by cell in a straight path.

2. is it posible to keep certain column of cells in the grid as rotated matching the path shape. eg. in an arc path, square cells rotated to match the shape. Thanks in advance

[h b]

i have an issue to formulate logic. how to move pointer in any straight line(column or row) cell by cell. please help