Drawing Polygon shapes with data

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Chris Dan
Chris Dan 2020-1-24
评论： Chris Dan 2020-2-25
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?
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Turlough Hughes
Turlough Hughes 2020-1-24
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
Chris Dan 2020-1-24
yeah, thanks :) now it draws correctly
just one question, if the out struct has more than 1 file, then it will also draw correctly?

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采纳的回答

Turlough Hughes
Turlough Hughes 2020-1-24
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.
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Turlough Hughes
Turlough Hughes 2020-1-26
You would have no output, so it would go something like
function [] = myrectangles(out)
% code above
end
Chris Dan
Chris Dan 2020-2-25
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

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更多回答（1 个）

Steven Lord
Steven Lord 2020-1-25
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)

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