making a transformation of an already moving image

Question

Kendall Donahoe 2021-3-12

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/771258-making-a-transformation-of-an-already-moving-image

编辑： Prabhan Purwar 2021-3-19

I need to make it so that the leter k is transformed once per rotation as the letter moves and can't figure out how to do it. please help I have attached my script

% This script will move the letter K about the screen using

% homogeneous coordinate transformations common to computer graphics

p1=[0;0]; p2=[0.5;0]; p3=[0.5;4]; p4=[3;0]; p5=[3.5;0]; p6=[0.5;4]; p7=[3;8]; p8=[2.5;8]; p9=[0.5;4];p10=[0.5;8]; p11=[0;8];

D = [p1,p2,p3,p4,p5,p6,p7,p8,p9,p10,p11]

fill(D(1,:),D(2,:),'r')

axis([-30 30 -30 30])

hold on

N = [D;ones(1,11)]

N1=N;

R = [cos(pi/18) -sin(pi/18) 0; sin(pi/18) cos(pi/18) 0; 0 0 1]

color = str2mat('y','m','c','r','g','b','k');

for i=0:5

Shift = [1 0 i; 0 1 i; 0 0 1];

N1 = Shift*N1;

for j=1:36

N1 = R*N1;

D1 = N1(1:2,:);

fill(D1(1,:),D1(2,:),color(rem(j,7)+1))

pause(0.15);

end

hold off

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Answer 1

Prabhan Purwar 2021-3-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/771258-making-a-transformation-of-an-already-moving-image#answer_652312

编辑：Prabhan Purwar 2021-3-19

在 MATLAB Online 中打开

Hi,

To make the letter k transform once per rotation you will need to change from letter coordinate frame to global coordinate frame where the circular path is defined.

Kindly have a look at the following code:

p1=[0;0]; p2=[0.5;0]; p3=[0.5;4]; p4=[3;0]; p5=[3.5;0]; p6=[0.5;4]; p7=[3;8]; p8=[2.5;8]; p9=[0.5;4];p10=[0.5;8]; p11=[0;8];
D = [p1,p2,p3,p4,p5,p6,p7,p8,p9,p10,p11];
fill(D(1,:),D(2,:),'r')
axis([-30 30 -30 30])
hold on
N = [D;ones(1,11)];
N1=N;
R = [cos(pi/18) -sin(pi/18) 0; sin(pi/18) cos(pi/18) 0; 0 0 1];
color = char('y','m','c','r','g','b','k');
for i=0:5
% 	Shift = [1 0 i; 0 1 i; 0 0 1];
% 	N1 = Shift*N1;
    N1 = R*N1;
    D1 = N1(1:2,:);
for j=1:36
    x = (3*i+3)*cosd(10*j);
    y = (3*i+3)*sind(10*j);
    
    % Transform to global coordinate frame 
	fill(D1(1,:)+x,D1(2,:)+y,color(rem(j,7)+1))
	pause(0.15);
end
end
hold off
Thanks