clear all
close all
clc
% straight line 1 of the athletic track
x1=-10:0.2:10;
y1=0*x1+5;
% semi-circle 1 of the athletic track
theta=pi/2:-0.04:-pi/2;
x2=5*cos(theta)+10;
y2=5*sin(theta);
% straight line 2 of the athletic track
x3=10:-0.2:-10;
y3=0*x3-5;
% semi-circle 2 of the athletic track
theta=3*pi/2:-0.04:pi/2;
x4=5*cos(theta)-10;
y4=5*sin(theta);
% Include straight lines and semi-circles to get an entire athletic track
x=[x1 x2 x3 x4];
y=[y1 y2 y3 y4];
% Two cycles of the athletic track
x=[x x];
y=[y y];
% plot the athletic track
plot(x,y)
axis([-16,16,-6,6])
axis equal
hold on
for i=1:length(x)
k1=fix(1.1*i); % define velocity of the 1st player (uniform velocity)
if k1>length(x)
k1=length(x);
end
h1=plot(x(k1),y(k1),'Color',[1 0 0],'Marker','o','LineWidth',5); % show location of the 1st player
k2=fix(1+5*i^(0.76)); % define velocity of the 2nd player (faster at the beginning, then slower)
if k2>length(x)
k2=length(x);
end
h2=plot(x(k2),y(k2),'Color',[k2/length(x) 0 k2/length(x)],'Marker','s','LineWidth',5); % show location of the 2nd player
k3=fix(1+exp(0.012*i)); % define velocity of the 3rd player (slower at the beginning, then faster)
if k3>length(x)
k3=length(x);
end
h3=plot(x(k3),y(k3),'Color',[rand rand rand],'Marker','v','LineWidth',5); % show location of the 3rd player
pause(0.05) % pause to show the locations of players
drawnow
delete(h1)
delete(h2)
delete(h3)
end
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