intersections between circles and lines

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gianluca scutiero
gianluca scutiero 2017-3-29
评论： KSSV 2017-3-29
I have a matrix with the coordinates x,y of start of some lines and the matrix with coordinates x,y of end of each lines. I have also a vector with the centers of the circles and a vector with the radius. I would find the intersection points of these lines with circles. If a line intersects a circle, it is colored red. At the moment I wrote this code:
hold on
for i=1:3
theta = 0 : 0.01 : 2*pi;
radius = 3;
x = radius * cos(theta);
y =radius * sin(theta);
plot(x+xCenter(i), y+yCenter(i));
axis square;
grid on;
axis equal;
line(startxy,endxy)
end
For the moment I imposed a constant radius. You see a "cycle for" until 3 because I have imposed a vector with 3 rows, to try if the code works. Thanks for your help

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回答（1 个）

KSSV
KSSV 2017-3-29
  2 个评论
gianluca scutiero
gianluca scutiero 2017-3-29
I thank you for your response. The problem is that I use a function "line" that it is not supported by the function InterX
for i=1:3
t = 0:pi/200:2*pi;
r1 = 3; x1 = r1.*cos(t); y1 = r1.*sin(t);
r2 = line(startendx,startendy);
P = InterX([x1+xCenter(i);y1+yCenter(i)],[line(startendx,startendy)]);
plot(x1+xCenter(i),y1+yCenter(i),P(1,:),P(2,:),'ro')
axis equal
end
KSSV
KSSV 2017-3-29
Why to use line? You have to input coordinates for the curves.

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