[英]How to animate 3D scatter plot by adding each point at a time in R or MATLAB
我在這里有一組3D坐標。 數據具有52170行和4列。 每行代表一個點。 第一列是點索引號,從1增加到52170。第二列到第四列分別是x,y和z軸的坐標。 前10行如下:
seq x y z
1 7.126616 -102.927567 19.692112
2 -10.546907 -143.824966 50.77417
3 7.189214 -107.792068 18.758278
4 7.148852 -101.784027 19.905006
5 -14.65788 -146.294952 49.899158
6 -37.315742 -116.941185 12.316169
7 8.023512 -103.477882 19.081482
8 -14.641933 -145.100098 50.182739
9 -14.571636 -141.386322 50.547684
10 -15.691803 -145.66481 49.946281
我想創建一個3D散點圖,其中使用R或MATLAB將每個點依次添加到該點。 首先添加由第一條線表示的點,然后再添加由第二條線表示的點,一直到最后一個點。
另外,我希望控制添加點的速度。
對於二維散點圖,我可以使用以下代碼:
library(gganimate)
x <- rnorm(50, 5, 1)
y <- 7*x +rnorm(50, 4, 4)
ind <- 1:50
data <- data.frame(x, y, ind)
ggplot(data, aes(x, y)) + geom_point(aes(group = seq_along(x))) + transition_reveal(ind)
但是我找不到有關如何針對3D散點圖執行此操作的信息。 誰能告訴我該怎么做? 謝謝。
這是MATLAB的答案
通常,可以使用相同的方法對圖(或3d圖,散點圖,曲面或其他圖形對象)進行動畫處理:
NaN
值創建帶有不可見數據點的圖)。 XData
, YData
( ZData
如果3D繪圖, CData
,如果劇情對象有一些你想動畫的顏色)。 以下代碼是適合您的情況的上述方法的實現:
%% Read data and place coordinates in named variables
csvfile = '3D scatter plot.csv' ;
data = csvread(csvfile,2) ;
% [optional], just to simplify notations further down
x = data(:,2) ;
y = data(:,3) ;
z = data(:,4) ;
%% Generate empty [plot3] objects
figure
% create an "axes" object, and retrieve the handle "hax"
hax = axes ;
% create 2 empty 3D point plots:
% [hp_new] will contains only one point (the new point added to the graph)
% [hp_trail] will contains all the points displayed so far
hp_trail = plot3(NaN,NaN,NaN,'.b','Parent',hax,'MarkerSize',2) ;
hold on
hp_new = plot3(NaN,NaN,NaN,'or','Parent',hax,'MarkerSize',6,'MarkerEdgeColor','r','MarkerFaceColor','g','LineWidth',2) ;
hold off
%% Set axes limits (to limit "wobbling" during animation)
xl = [min(x) max(x)] ;
yl = [min(y) max(y)] ;
zl = [min(z) max(z)] ;
set(hax, 'XLim',xl,'YLim',yl,'ZLim',zl)
view(145,72) % set a view perspective (optional)
%% Animate
np = size(data,1) ;
for ip=1:np
% update the "new point" graphic object
set( hp_new , 'XData',x(ip), 'YData',y(ip), 'ZData',z(ip) )
% update the "point history" graphic object
% we will display points from index 1 up to the current index ip
% (minus one) because the current index point is already displayed in
% the other plot object
indices2display = 1:ip-1 ;
set(hp_trail ,...
'XData',x(indices2display), ...
'YData',y(indices2display), ...
'ZData',z(indices2display) )
% force graphic refresh
drawnow
% Set the "speed"
% actually the max speed is given by your harware, so we'll just set a
% short pause in case you want to slow it down
pause(0.01) % <= comment this line if you want max speed
end
這將產生:
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