CODEWITHSUNDEEP
matlabmatrixtransformmatlab-guide
jiang
jiang

Reputation: 47

how to apply transform to 2d points in matlab?

Using matlab, I want to apply transform contain of rotate and translate to 2d points. for example my points are:

points.x=[1 5 7 100 52];
points.y=[42 96 71 3 17];
points.angle=[2 6 7 9 4];

the value of rotate is:30 degree
the value of x_translate is 5.
the value of y_translate is 54.

can any body help me to write matlab code for apply this transform to my points and calculate new coordinate of points after transform?

Upvotes: 0

Views: 515

Answers (1)

Zeta.Investigator
Zeta.Investigator

Reputation: 973

I don't know what you mean by points.angle since the angle of the points with respect to origin (in a trigonometric sense) is already defined by atand2(y,x)
Here is the code: 

clear;clc

oldCoord = [1 5 7 100 52;42 96 71 3 17];
newCoord = zeros(size(oldCoord));
theta = 30 * pi/180;

T = @(theta) [cos(theta), -sin(theta); sin(theta) , cos(theta)];
trans = [5;54];

for m = 1:size(oldCoord,2)
    newCoord(:,m) = T(theta) * oldCoord(:,m) + trans;
end

Result: 

oldCoord =

     1     5     7   100    52
    42    96    71     3    17
newCoord =

  -15.1340  -38.6699  -24.4378   90.1025   41.5333
   90.8731  139.6384  118.9878  106.5981   94.7224

Upvotes: 1

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