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2D plot of particles in contact

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Lorin Bosoc
Lorin Bosoc 2016-3-4
评论： Lorin Bosoc 2016-3-7
I have a .txt document with 3 columns that represent the x-coord, y-coord and radii of multiple particles in contact (each particle has a different radius). I am trying to plot them in x-y with their radii, however, when I stretch my figure the radii stay small... I want the radii to change in scale with the scale of the x-y axis. I used the following code to plot the particles and you can also see in the figures attached what I am talking about (which is basically what I don't want).
Can anyone help me please?
clc;
clear all;
%%Data reading from file
%Indicate file + path to file if needed (in base_filename)
base_filename = 'depositiontxt';
%Indicate input file format
file_format = 'txt';
filename = strcat(base_filename,'.',file_format);
%The function creates a structure with the data read from the file. The
%standard format is such:
% Line 1: Variable names separated by 'tab'
% Lines 2-onwards: Values for the variables
% The structure then contains the data as follows:
% structure_name.variable_name_1 = column 1 of the file etc.
C = tdfread(filename,'\t');
% X-coordinates are rounded to the nearest milimetre
x = C.x;
y = C.y;
r = C.r;
%%Plotting
%This controls the size of the points printed (in pixels so quite small)
%Sets the colour of the points and 'fill' used later tells the points to
%be filled
colour = 'blue';
C.a = pi * C.r.^2
%This is the plotting function, you can define the attributes here
scatter(C.x,C.y,C.a*10,colour,'fill'), xlabel('x [mm]'),ylabel('y [mm]'),title('Particle locations');
saveas(gcf,'Figure.png');

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回答（1 个）

Image Analyst
Image Analyst 2016-3-4
You can either create an image via the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F
Or you can pass in the sizes to scatter() and plot again once the resizing is done.
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Image Analyst
Image Analyst 2016-3-6
If r are the radii of the circles in mm, then you need to convert that into some size in pixels, like in the range of 3 - 15 or whatever. So figure out the scaling factor to do that, then
% Convert from mm to pixels
scaledSizes = r * scaleFactor;
% Replot with different size markers:
scatter(x, y, scaledSizes);
Lorin Bosoc
Lorin Bosoc 2016-3-7
That's what the code already does, only that the scaled factor is applied directly in the scatter function.

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