Drawing Polygon shapes with data

Hello, I have such data,

The code which I am using to plot it is this

k = size(out,2); % k =1 since there is only one file in out struct
 %% Drawing from the Data Files %
for i =1:1:k
    a = size(out(i).model_data,1)
    for j =1:1:(a-1)
        
        x1(j) = [out(i).model_data(j,1)];
        x2(j) = [out(i).model_data(j+1,1)];
        y1(j) =  [out(i).model_data(j,2)];
        y2(j) =  [out(i).model_data(j+1,2)];
        
        rectangle('Position',[x1(j) x2(j) y1(j) y2(j)])
         axis([0 0.02 0 0.2])
         hold on
    end
end

the result, which I am getting is this:

which is not correct, because all the rectangles should join each other, does any one know what to do?

[Turlough Hughes]

How exactly do you need the rectangles joining?

[Chris Dan]

one after the another, wall to wall, since it is one body with different sections,

just to make one thing clear, the first column is the start and end points of the rectangle and the second column is the height of the rectangle at that point

[Turlough Hughes]

Is this what you mean?

k = size(out,2);
for i =1:k
    a = size(out(i).model_data,1);
    for j =1:(a-1)
        coord = out(i).model_data(j:j+1,:);
        rectangle('Position',[coord(1,1) 0 coord(2,1)-coord(1,1) coord(1,2)])
        axis([0 0.2 0 0.02])
        hold on
    end
end

If so I will move to the answer section.

[Chris Dan]

yeah, thanks :) now it draws correctly

just one question, if the out struct has more than 1 file, then it will also draw correctly?

Answer 1

[Turlough Hughes]

You can draw the rectangles from your struct as follows:

k = size(out,2);
figure(), hold on
for i = 1:k
    a = size(out(i).model_data,1);
    for j =1:(a-1)
        coord = out(i).model_data(j:j+1,:);
        rectangle('Position',[coord(1,1) 0 coord(2,1)-coord(1,1) coord(1,2)])
        axis([0 0.2 0 0.02])
    end
end

When you have a non-scalar structure, this plots all rectangles on the same figure. For seperate figures you should move "figure(), hold on" into the first loop.

[Chris Dan]

Turlough Hughes

Thanks, If I were to make this code as a function, the input will be out struct, but what can be the output?

I want as a function, so that I can use it any where as a single line of code

[Turlough Hughes]

You would have no output, so it would go something like

    function [] = myrectangles(out)
    % code above
  end

[Chris Dan]

Turlough Hughes

Hi, sorry to disturb you again, but I have one small question

the first column is the start and end points of the rectangle and the height of the rectangle is the second column - third column is at that point.

Can you tell me what to change in your code:

k = size(MD,1);
figure(), hold on
for i = 1:k
    a = size(MD(i),1);
    for j =1:(a-1)
        coord = out(i).model_data(j:j+1,:);
        rectangle('Position',[coord(1,1) 0 coord(2,1)-coord(1,1) coord(1,2)])
        axis([0 0.2 -0.1 0.2])
    end
end

Also, can I draw inverted shape below the zero axis?

Thanks for helping me

Answer 2

[Steven Lord]

You could build a polyshape array with one element for each region that you want to draw. Once you've built your polyshape array you can plot it. I'm creating polyshape objects N using the nsidedpoly function, but you could call polyshape with the coordinates of the vertices to build the N's that are combined with union into the polyshape array.

A = polyshape;
for nsides = 3:6
    N = nsidedpoly(nsides, 'Center', [nsides nsides], 'Radius', 0.5);
    A = union(A, N);
end
plot(A)