How to draw an Arc in the direction you want? (with known radius, centre and angle)
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ErikJon Pérez Mardaras
el 9 de Nov. de 2020
Editada: ErikJon Pérez Mardaras
el 10 de Nov. de 2020
I'm trying to draw an arc between 350º and 0º angles, but the point is that I would like to draw it in counter-clock wise. What is the general method of drawing an arc in matlab in the direction you want?
The code I have written is the following:
hold on
grid
axis equal
angini=350; %initial angle of the arc in degrees
angfin=0; %final angle of the arc in degrees
rangini=deg2rad(angini); %initial angle of the arc in radians
rangfin=deg2rad(angfin); %final angle of the arc in radians
centre=[0;0]; %centre of the arc
radius=10; %radius of the arc
teta = linspace(rangini,rangfin);
xco = centre(1)+radius*cos(teta); %x coordinates
yco = centre(2)+radius*sin(teta); % y coordinates
plot(xco,yco,'g') %plot the arc
And the result, as you can see, is the following:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/408320/image.png)
It drew the arc in a clockwise direction, not in a counterclock one. What is the general method of drawing an arc in matlab in the direction that you like?
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Respuestas (1)
Steven Lord
el 9 de Nov. de 2020
Use an ending angle of 360 degrees rather than an angle of 0 degrees. You can skip the deg2rad calls by using the degree-based trig functions cosd and sind. I also chose to change some of the variable names to make them a bit more descriptive. With those names you could argue the comments are unnecessary.
hold on
grid
axis equal
angleInitial=350; %initial angle of the arc in degrees
angleFinal=360; %final angle of the arc in degrees
centre=[0;0]; %centre of the arc
radius=10; %radius of the arc
theta = linspace(angleInitial,angleFinal);
xcoords = centre(1)+radius*cosd(theta); %x coordinates
ycoords = centre(2)+radius*sind(theta); % y coordinates
plot(xcoords,ycoords,'g') %plot the arc
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