Collision Problem (Square 2d)
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Hello there, i am trying to write some code that plots a square moving along a line with a certain velocity when the centre of the squares coordinates get within a certain tolerance the direction of the velocity becomes negative and so it 'bounces' off the wall. My code is below but the constraints in terms of direction don't seem to be working any insight would be greatly appreciated. Best Regards
fps = 20;
dt = 1/fps;
tmax = 10;
t = 0;
theta = 0;
dtheta = 1/20;
p = transpose([20,20,1]);
v = transpose([50,25,1]);
Vobj = transpose([2, -2, 1; 2,2,1; -2, 2, 1; -2, -2, 1]);
while t < tmax
x = p + t*v;
if x(1)<= 5 || x(1) >= 95
v(1)=-v(1);
elseif x(2)<= 5 || x(2) >= 95
v(2)=-v(2);
end
p = x;
% Transformations
T = [1,0,p(1);0,1,p(2);0,0,1];
S = [1+0.2*sin(2*t),0,0; 0,1+0.2*sin(2*t),0;0,0,1];
R = [cos(theta),sin(theta),0 ;-sin(theta),cos(theta),0;0,0,1];
% Application of Transformations
V = R*S*T*Vobj;
fill(V(1,:),V(2,:),'r')
hold on
axis([0,100,0,100])
hold off
shg;
pause(0.3);
% Updates
t = t + dt;
theta = theta + dtheta;
end
1 Comment
aliyah islam
on 18 Dec 2019
Did you end up figuring this problem out? If so have you still got the matlab code for it, as i have a similar problem to solve. Thanks
Answers (1)
madhan ravi
on 2 Nov 2018
fps = 20;
dt = 1/fps;
tmax = 10;
t = 0;
x =[20,20,1];
v = [50,25,1];
ctr=1;
while t < tmax
p(ctr,:) = x + t*v;
if p(1) < 5 || p(1) > 95 || p(2) < 5 || p(2) > 95
p(ctr,:) = x + t*(-v);
else
p(ctr,:) = x + t*v;
end
plot(p(1),p(2),'o')
hold on
axis([0,100,0,100])
hold off
pause(1);
t = t + dt;
end
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