MATLAB Answers

i have to draw an incircle in a triangle.

조회 수: 14(최근 30일)
Saurabh Agarwal
Saurabh Agarwal 17 Nov 2020
i have to draw an incircle of a triangle, for that i have made an traingle... but now, how to plot an incicle in it.
clc
clear
p1=[2 0 0];
p2=[0 2 0];
p3=[0 0 2];
% Plot triangle using 'patch'
figure('color','w')
h=patch('Faces',1:3,'Vertices',[p1;p2;p3]);
set(h,'FaceColor','r','EdgeColor','k','LineWidth',2,'FaceAlpha',0.5)
axis equal vis3d
view([100 100])
xlabel('x','FontSize',20)
ylabel('y','FontSize',20)
zlabel('z','FontSize',20)

답변(1개)

Swatantra Mahato
Swatantra Mahato 20 Nov 2020
Hi Saurabh,
Assuming you have calculated the incentre and inradius for the incircle, you can plot the incircle by using the parametric equations for a circle in 3D space and using the "plot3" function.
An example workflow is shown below (here "r" is the inradius and "in" is the vector representing the incentre)
V=[2,2,2]; %the normal to the plane of the triangle
V=V/norm(V); % unit vector for the normal
A=(p1-in)/norm(p1-in); % a unit vector on the plane passing through center of the circle
B=cross(A,V); % a vector perpendicular to A and in the plane of the triangle. A and B act as the axes
th=0:0.01:2*pi;
x=in(1)+r*cos(th)*A(1)+r*sin(th)*B(1);
y=in(2)+r*cos(th)*A(2)+r*sin(th)*B(2);
z=in(3)+r*cos(th)*A(3)+r*sin(th)*B(3);
hold on
l=plot3(x,y,z)
Hope this helps

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by