在 MATLAB 中沿曲线移动的点 [英] Points moving along a curve within MATLAB

问题描述

我设法编辑了给我的一段代码，以显示沿曲线移动的点.

I have managed to edit a piece of code that was given to me in order to show a point moving along a curve.

我试图找到一种方法来编辑它，以便创建两个沿该曲线移动的独立点，或创建第二个图形来显示另一个点沿图形移动.要点是这些点需要相互独立，以便可以对它们应用算法.

I am trying to find a way to edit this in order to create two independent points moving along this curve or to create a second figure that shows another point moving along a graph. The main point is that the points need to be independent of one another so that an algorithm can be applied to them.

我目前有以下代码，它给出了沿曲线移动的单个点:

I currently have the following code which gives a single point moving along the curve:

%# control animation speed  
DELAY = 0.01;  
numPoints = 600;  

%# create data  
x = linspace(0,1,numPoints);  
f = 5;  
C = 1-exp(-f);  
y = C*(1-(exp(-f*x))); 

%# plot graph  
figure('DoubleBuffer','on')                  %# no flickering  
plot(x,y, 'LineWidth',2), grid on  
xlabel('x'), ylabel('y'), title('')  

%# create moving point + coords text  
hLine = line('XData',x(1), 'YData',y(1), 'Color','r', ...  
        'Marker','o', 'MarkerSize',6, 'LineWidth',2);  
hTxt = text(x(1), y(1), sprintf('(%.3f,%.3f)',x(1),y(1)), ...  
    'Color',[0.2 0.2 0.2], 'FontSize',8, ...  
    'HorizontalAlignment','left', 'VerticalAlignment','top');  



%# infinite loop  
i = 1;                                       %# index  
while true        
    %# update point & text  
    set(hLine, 'XData',x(i), 'YData',y(i))     
    set(hTxt, 'Position',[x(i) y(i)], ...  
        'String',sprintf('(%.3f,%.3f)',[x(i) y(i)]))          
    drawnow                                  %# force refresh  
    %#pause(DELAY)                           %# slow down animation  

    i = rem(i+1,numPoints)+1;                %# circular increment  
    if ~ishandle(hLine), break; end          %# in case you close the figure  
end

推荐答案

这里介绍了如何添加另一个点，该点从独立于第一个点的末端开始滑动.

Here's how you can add another point that starts sliding from the end independent of the first point.

在您的代码中，在行 %#Infinite loop 之前，添加以下内容:

In your code, before the line %#Infinite loop, add the following:

hLine2 = line('XData',x(end), 'YData',y(end), 'Color','g', ...  
        'Marker','o', 'MarkerSize',6, 'LineWidth',2);  
hTxt2 = text(x(end), y(end), sprintf('(%.3f,%.3f)',x(1),y(1)), ...  
    'Color',[0.2 0.2 0.2], 'FontSize',8, ...  
    'HorizontalAlignment','left', 'VerticalAlignment','top');  

在循环内，在 drawnow 命令之前，添加以下内容:

and inside the loop, before the drawnow command, add the following:

set(hLine2, 'XData',x(end-i), 'YData',y(end-i))     
    set(hTxt2, 'Position',[x(end-i) y(end-i)], ...  
        'String',sprintf('(%.3f,%.3f)',[x(end-i) y(end-i)]))   

所以你的第二点向下滑动，第一点向上滑动.您可以在 hLine2 和 hTxt2 的定义中根据需要定义点的轨迹

So your second point slides down and the first slides up. You can define the trajectory for the point as you wish in the definition of hLine2 and hTxt2

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