how to plot a line with angle

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m
m 2014-3-16
回答： m 2014-3-16
how to draw a line of AB and BC, with angle ABC = 30 degree. i.e BC is at 2,2, where axis x and y from 0 to 10.the length is about 2 cm for each line.thank you

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Image Analyst
Image Analyst 2014-3-16
Once you do that elementary trigonometry to find all the points, you can use line() to draw the 2 or 3 lines to form the angle or triangle.
line([x1, x2], [y1, y2]);
But with just a single point at (2,2), you need to define the location of the other 2 points first.
Then use xlim and ylim to set up the axes limits:
xlim([0, 10]);
ylim([0, 10]);

更多回答（1 个）

m
m 2014-3-16
thank you. i'm confusing between plot() and line(). now i get the clear picture.

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