How do I change the orientation of a marker randomly?
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I have created 2 random points represented by the '+' marker. I want to change the orientations of these 2 markers randomly. Can anyone help me out? This is my code so far
x=rand(1,2)*100;
y=rand(1,2)*100;
scatter(x,y,'+');
I want random orientations of the 2 '+' markers.
4 Comments
KSSV
on 12 Apr 2017
So is that the marker orientation you want to change? '+' is a marker which shows the location of your point on the graph. It is not the orientation of point.
Answers (2)
Roger Stafford
on 12 Apr 2017
If you mean random orientation with respect to the cartesian coordinate origin, and if the orientation change is to be the same for each point, then do this:
t = 2*pi*rand-pi;
x2 = x*cos(t)-y*sin(t);
y2 = x*sin(t)+y*cos(t);
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Thorsten
on 12 Apr 2017
You have to draw two crossing lines of a random angle. You cannot change the orientation of Matlab's markers.
The following function may be useful; you have to adjust the size of marker using r depending on your axis, and use
axis equal
To get a random angle, set alpha to rand*2*pi.
function plotcrossmarker(alpha, r, x0, y0)
if nargin < 1, alpha = 0; end;
if nargin < 2, r = 1; end
if nargin < 3, x0 = 0; end
if nargin < 4, y0 = 0; end
x = r*cos(alpha);
y = r*sin(alpha);
xx = [-x x NaN -y y];
yy = [-y y NaN x -x];
line(xx + x0, yy + y0)
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