CODEWITHSUNDEEP
matlabmatlab-figurepolygons
user3768024
user3768024

Reputation:

How to set edgecolor same as the facecolor while drawing polygos in matlab?

I am plotting many polygons using the command fill.

fill(X1,Y1,1)
fill(X2,Y2,2)
...

I want to set the edge color the same as the face color. What do I have to do for that?

I am plotting many polygons and I need to find a way to set the edgecolor same as the facecolor. Even the facecolors are not known to me.

I have to use numbers, because I am plotting a data.

Upvotes: 0

Views: 522

Answers (2)

Robert Seifert
Robert Seifert

Reputation: 25232

I don't get what's wrong with the suggestion of CitizenInsane, but if you just want to save some code you could use a little helper function:

FillItLikeIWant = @(x,y,color) fill(x, y, color, 'EdgeColor',color)

FillItLikeIWant(x,y,'r')

Alternatively you can define all your "Styles" in advance, thats how I usually do it with line plots, in an array like this:

myStyles = {{'r','EdgeColor','r'};
            {'b','EdgeColor','b'};
            {'g','EdgeColor','g'}}

and then iterate through the styles:

for ii = 1:3
    fill(x,y,myStyles{ii}{:}); hold on
end

Edit:

I don't know what the single number 1 or 2 in your example fill(X1,Y1,1) is supposed to do, but maybe you want to create and use a colormap like this:

N = 500;
Cmap = colormap(jet(N));

Now use the helper function and every polygon gets another color of the Cmap.

for ii = 1:500
    h{ii} = FillItLikeIWant(x,y,Cmap(ii,:));
end

you can keep track of all colors just by the indices. Alternatively save the handles of every single polygon. So afterwards you can get the color of a polygon by its handle:

get(h{500},'FaceColor')

ans =

        0.504            0            0

which is the same as:

Cmap(500,:)

ans =

        0.504            0            0

Upvotes: 1

CitizenInsane
CitizenInsane

Reputation: 4855

Just set EdgeColor property/value pair, with the same color as faces:

t = (1/16:1/8:1)'*2*pi;
x = sin(t);
y = cos(t);
fill(x, y, 'r', 'EdgeColor', 'r');

Sample code for drawing multiple polygons with different colors in a for loop (using current colormap):

function [] = foo()
%[
    cmap = colormap; % Use some colormap to have different color for polygons
    ccount = size(cmap, 1); % Number of elements in the colormap

    figure; % Create a figure
    hold on; % Avoids deleting previous polygons

    pcount = 50; % number of polygons
    for i = 1:pcount,

        % Create randomly translated polygon
        t = (1/16:1/8:1)'*2*pi;
        x = 0.1*sin(t) + rand;
        y = 0.1*cos(t) + rand;

        % Select a color in the colormap
        colorIndex = mod(i, ccount);
        if (colorIndex == 0), colorIndex = ccount; end       
        colorValue = cmap(colorIndex, :);

        % Draw the polygon
        fill(x, y, colorValue, 'EdgeColor', colorValue);

    end
%]
end

Upvotes: 1

Related Questions