Filling area with pattern

Question

shane watson 2019-12-10

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https://ww2.mathworks.cn/matlabcentral/answers/495966-filling-area-with-pattern

编辑： Adam Danz 2019-12-11

Hello all,

I would like to know the how to fill the area with some pattern [CrossedLines, DiagonalLines, FDiagonalLines, HorizontalLines, Solid, VerticalLines, or XCrossedLines]. I already use this code to fill the area with color:

a=[1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24]
sh2=stairs(1:24,a, '*','color',[0 1 0],'MarkerEdgeColor','r', 'MarkerSize',4,'LineWidth',1.3);
x = [sh2.XData(1),repelem(sh2.XData(2:end),2)]; % Although it works fine for me but I don't what is [XData(2:end),2] means, it would be good if you explain a bit.
y = [repelem(sh2.YData(1:end-1),2),sh2.YData(end)];
viu=fill([x,fliplr(x)],[y,bottom*ones(size(y))],[0 1 0])
viu.FaceAlpha = 0.2;

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Answer 1

Adam Danz 2019-12-10

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编辑：Adam Danz 2019-12-11

在 MATLAB Online 中打开

Hi shane, filling with a pattern isn't trivial so I recommend the functions listed in the file exchange. However, here's a fairly easy way to add a polka dot pattern to the area being filled.

The coordinates used to fill form a polygon. This makes an array of random dots that span the size of your polygon and then it removes any dots that are outside of the polygon.

See inline comments for details.

% Here are the coordinates of your polygon used in fill()
polyX = [x,fliplr(x)];
polyY = [y,bottom*ones(size(y))]; 
viu=fill(polyX,polyY,[0 1 0])
viu.FaceAlpha = 0.2;
% Create array of polkadot coordinates that span the size of the polygon
[dotsX,dotsY] = ndgrid(...
    min(polyX): 1 : max(polyX), ...
    min(polyY): 1 : max(polyY));      
% Determine which coordinates are on or in your polygon
[in,on] = inpolygon(dotsX,dotsY,polyX,polyY); 
% extract coordinates in or on polygon
inX = dotsX(in|on); 
inY = dotsY(in|on); 
% Plot polkadots
hold on
h = plot(inX,inY,'k.','MarkerSize',4,'MarkerFaceColor','k'); 

See this answer to learn how to avoid the polkadots appearing in the legend.

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shane watson 2019-12-10

That's great, lastly, just one thing to share with you. i.e, I use this for another plot belw, but as you can see that polkadots are not appearing between 0 and 1, how to fix that ?and how to increase number of polkadots. I'm sure this the last :)

Adam Danz 2019-12-11

在 MATLAB Online 中打开

In this line from my code below, the middle value determines the interval between dots along the x axis and y axis

[dotsX,dotsY] = ndgrid(...
    min(polyX): 1 : max(polyX), ...        % for x axis
    min(polyY): 1 : max(polyY));           % for y axis
%...............^

You could adjust that number for each axis.

Alternatively you could try something like this below where the last input to linspace() determines the number of dots along the x and y axes.

[dotsX,dotsY] = ndgrid(...
    linspace(min(polyX), max(polyX), 10), ...    % for x axis
    linspace(min(polyY), max(polyY), 10);        % for y axis
%.....................................^

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