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Draw a line with an angle

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SUBHA GHOSH
SUBHA GHOSH 2017-6-30
编辑： Garvit Amipara 2021-4-8
we have a point(x,y) and length of the line is L and the angle between horizontal line and the draw line is A.
  2 个评论
Jan
Jan 2017-6-30
Fine. What is your question? What have you tried so far and which problem occurres?
Image Analyst
Image Analyst 2017-6-30
There is a line function you know. Just specify the two endpoints, which can be computed from simple trig.
line([x1,x2], [y1,y2], 'Color', 'r', 'LineWidth', 2);

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回答（1 个）

Ahmed raafat
Ahmed raafat 2017-7-29
%L is the length
%angle is alpha
x2=x+(L*cos(alpha));
y2=y+(L*sin(alpha));
plot([x x2],[y y2])
  1 个评论
Garvit Amipara
Garvit Amipara 2021-4-8
编辑：Garvit Amipara 2021-4-8
This works perfectly!
Note: instead of sin(alpha), cos(alpha), use sind(alpha) and cosd(alpha) to avoid the floating point errors of the sin and cos values.

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