[英]how to apply transform to 2d points in matlab?
Using matlab, I want to apply transform contain of rotate and translate to 2d points. 使用matlab,我想应用包含旋转的变换并转换为2d点。 for example my points are: 例如,我的观点是:
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? 有谁可以帮助我编写matlab代码以将该变换应用于我的点并在变换后计算点的新坐标?
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) 我不知道points.angle
是什么意思,因为这些点相对于原点的角度(在三角意义上)已经由atand2(y,x)定义
Here is the code: 这是代码:
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: 结果:
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
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