Drawing a segment of a circle
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I would like to draw a segment of a circle (like a slice of a pizza) but cannot find an easy way to do it.
I am currently drawing triangles using fill function but ideally I need one side of the triangle to be curved. Is there a way to specify a curvature of a line? Thanks B
the cyclist on 27 Apr 2011
There are several files in the File Exchange that will do what you want. Here is one:
Also, here is a simple function that could be modified to draw just a segment:
function h = circle(x,y,r,nsegments)
th = 0:2*pi/nsegments:2*pi;
xunit = r * cos(th) + x;
yunit = r * sin(th) + y;
h = plot(xunit, yunit);
More Answers (1)
Matt Fig on 27 Apr 2011
Here is another function to do it. It returns the handle to the patch object so that the color can be set or whatever.
function P = plot_arc(a,b,h,k,r)
% Plot a circular arc as a pie wedge.
% a is start of arc in radians,
% b is end of arc in radians,
% (h,k) is the center of the circle.
% r is the radius.
% Try this: plot_arc(pi/4,3*pi/4,9,-4,3)
% Author: Matt Fig
t = linspace(a,b);
x = r*cos(t) + h;
y = r*sin(t) + k;
x = [x h x(1)];
y = [y k y(1)];
P = fill(x,y,'r');
axis([h-r-1 h+r+1 k-r-1 k+r+1])
Now from the command line:
P = plot_arc(pi/4,3*pi/3,9,-4,3);