Help Needed: Add Axis, Draw Arm Pieces, Rotate Objects

[student012]

LEASE HELP!

-Add an axis to current rectangle
-Draw both piece of arm
-rotate object first axis 20 degree
--redraw.
-then, rotate 2nd part about 2nd axis to -30degree

my current code for rectangle is
%RECTANGLE('Position', [x y w h])
w=4.5;

%width
h=.5;

%height
x=1.75;y=2.75;

%corner position
xv=[x x+w x+w x x];yv=[y y y+h y+h y];
p1=patch(xv,yv,[0 0 0]);

% original rectangle
T=[-2 -2 -2 -2 -2;-3 -3 -3 -3 -3];
axis equal;
grid on;


R(1,:)=xv;R(2,:)=yv;
p=R+T;

%Translation
alpha=pi/9;
XY=[cos(alpha) -sin(alpha);sin(alpha) cos(alpha)]*p;
Y=patch(p(1,:),p(2,:),'k');
F=patch(XY(1,:),XY(2,:),'k');
T3=[2 2 2 2 2;3 3 3 3 3];
B=XY+T3
y=patch(B(1,:),B(2,:),'k');

 

[Pythagorean]

your instructions are vague, is this homework?

 

[student012]

yes, its my homeowrk..
Tht's the instruction from my teacher.

 

[Pythagorean]

I have no context, so I don't really understand what you're trying to do or what your problem is.

 

[alphy]

Hello,

I can see that you are trying to add an axis, draw arm pieces, and rotate objects in your code. To add an axis to your current rectangle, you can use the "hold on" command before drawing the rectangle. This will allow you to add additional objects to your plot without erasing the previous ones.

To draw the arm pieces, you can use the "line" function to draw two lines that will represent the two pieces of the arm. You can specify the starting and ending points of each line, as well as the color and thickness.

To rotate an object, you can use the "rotate" function. This function allows you to specify the object you want to rotate, the angle of rotation, and the axis of rotation. For example, to rotate the first part of the arm 20 degrees around the first axis, you can use the following code:

rotate(p1, [1 0 0], 20)

Similarly, to rotate the second part of the arm -30 degrees around the second axis, you can use the following code:

rotate(p2, [0 1 0], -30)

Remember to redraw your objects after each rotation using the "patch" or "line" function.

I hope this helps. Let me know if you have any further questions. Good luck with your project!