2d coordinate transformation specified origin matlab
12 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Reuben Addison
el 22 de En. de 2019
Editada: Reuben Addison
el 22 de En. de 2019
I asked this question sometime ago but i realised I did not ask it well due to me being new to matlab, I have a cordinate point I want to rotate 45 degrees clock wise but has a different origin other than 0,0. My origin is [start_x = 24.000;start_y = 16.000] and the cordinate I want to rotate about the origin is [target_x = 27.000,target_y = 16.000]
This what I have attempted so far.
theta = pi/4 ;
R = [cos(theta) -sin(theta); sin(theta) cos(theta)];
p = [target_x target_y]';
New_Target = p * R;
Any Ideas?
0 comentarios
Respuesta aceptada
Brian Hart
el 22 de En. de 2019
Hi Reuben,
You're almost there.
The basic idea is to subtract the rotation point value from the target point, so that you ARE rotating about the origin. Then do the rotation, and add the offset back.
target_x = 27.000;
target_y = 16.000;
start_x = 24.000;
start_y = 16.000;
p = [target_x target_y]';
rotPt = [start_x start_y]';
theta = pi/4 ;
R = [cos(theta) -sin(theta); sin(theta) cos(theta)];
pTmp = p - rotPt;
pRotTmp = R * pTmp; %this is the proper multiplication order
pRot = pRotTmp + rotPt;
With this you get
pRot =
26.1213
18.1213
1 comentario
Más respuestas (0)
Ver también
Categorías
Más información sobre Surface and Mesh Plots en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!