Bouncing Ball Animation Getframe
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I don't understand what I am doing wrong. I have to create an animation of a ball bouncing. But I have to repeat a for loop for each bounce. It also plays the animation twice. Is there a simpler way of doing this? Also, is there a way to speed up the code so that the animation does not play so slowly? I was thinking that I could write a function that would call it to repeat the animation but I am not sure.
%%Animation
clc, clf, clear
g = 9.81;
theta0 = 45*pi/180;
v0=5;
t(1) = 0; x = 0; y = 0;
plot(x,y, 'o', 'MarkerFaceColor','b', 'MarkerSize', 8)
axis([0 8 0 .8]);
dt = 1/128;
M(1) = getframe
for j = 2:100
t(j) = t(j - 1) + dt;
x = v0*cos(theta0)*t(j);
y = v0*sin(theta0) * t(j) - 0.5*g*t(j)^2;
plot(x,y, 'o', 'MarkerFaceColor', 'b','markerSize', 8);
axis([0 8 0 .8]);
M(j)= getframe;
end
M(2) = getframe
t(100) = 0;
v0 = v0*.8;
for j = 101:198
t(j) = t(j - 1) + dt;
x = v0*cos(theta0)*t(j)+2.5;
y = v0*sin(theta0) * t(j) - 0.5*g*t(j)^2;
plot(x,y, 'o', 'MarkerFaceColor', 'b','markerSize', 8);
axis([0 8 0 .8]);
M(j)= getframe;
end
M(3) = getframe
v0 = v0*.8;
t(198) = 0;
for j = 199:300
t(j) = t(j - 1) + dt;
x = v0*cos(theta0)*t(j)+4;
y = v0*sin(theta0) * t(j) - 0.5*g*t(j)^2;
plot(x,y, 'o', 'MarkerFaceColor', 'b','markerSize', 8);
axis([0 8 0 .8]);
M(j)= getframe;
end
M(4) = getframe
v0 = v0*.8;
t(300) = 0;
for j = 199:300
t(j) = t(j - 1) + dt;
x = v0*cos(theta0)*t(j)+4;
y = v0*sin(theta0) * t(j) - 0.5*g*t(j)^2;
plot(x,y, 'o', 'MarkerFaceColor', 'b','markerSize', 8);
axis([0 8 0 .8]);
M(j)= getframe;
end
movie(M, 1, 1000)
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채택된 답변
Alan Stevens
2020년 11월 1일
편집: Alan Stevens
2020년 11월 1일
Like this?
g = 9.81;
theta0 = 45*pi/180;
v0=5;
dt = 1/128;
ntimes = 400;
tend = ntimes*dt;
t = linspace(0,tend,ntimes);
vx = v0*cos(theta0);
vy = v0*sin(theta0);
x = 0; y = 0;
xmax = vx*tend;
plot(x,y, 'o', 'MarkerFaceColor','b', 'MarkerSize', 8)
axis([0 xmax 0 .8]);
M(1) = getframe;
treset = 0;
for i = 1:ntimes
x = vx*t(i);
tm = t(i) - treset;
y = vy * tm - 0.5*g*tm^2;
plot(x,y, 'o', 'MarkerFaceColor', 'b','markerSize', 8);
axis([0 xmax 0 .8]);
M(i)= getframe;
if y<0
y = 0;
vy = 0.8*vy;
treset = t(i);
end
end
close
pause(1)
movie(M, 1, 50)
댓글 수: 4
Alan Stevens
2020년 11월 1일
It's just the total time. Just change the number of steps to change the total time.
추가 답변 (1개)
Image Analyst
2020년 11월 1일
See my attached demo for creating an animation from figures. You can set the frame rate for the VideoWriter.
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