Ellipse文章
Wikipedia有一个简单的JavaScript代码绘制椭圆.
它使用参数形式：
x(theta) = a0 + ax*sin(theta) + bx*cos(theta)
y(theta) = b0 + ay*sin(theta) + by*cos(theta)
哪里
(a0,b0) is the center of the ellipse
(ax,ay) vector representing the major axis
(bx,by) vector representing the minor axis
我把代码翻译成了一个MATLAB函数：
calculateEllipse.m
function [X,Y] = calculateEllipse(x, y, a, b, angle, steps)
%# This functions returns points to draw an ellipse
%#
%# @param x X coordinate
%# @param y Y coordinate
%# @param a Semimajor axis
%# @param b Semiminor axis
%# @param angle Angle of the ellipse (in degrees)
%#
narginchk(5, 6);
if nargin<6, steps = 36; end
beta = -angle * (pi / 180);
sinbeta = sin(beta);