功能：按下鼠标后并拖动鼠标，记录鼠标移动过的像素坐标，放开鼠标时结束。

设置鼠标响应

set(gcf,'WindowButtonDownFcn',@ButtonDownFcn);

set(gcf,'WindowButtonUpFcn',@ButtonUpFcn);

set(gcf,'WindowButtonMotionFcn',@ButtonMotionFcn);

gcf为当前figure的句柄；gca为当前坐标轴的句柄。

下面为示例代码：

function test_mouse_track()
% I = imread('1.bmp');
% imshow(I); hold on
figure;hold on
axis([-10,10,0,5]);
set(gcf,'WindowButtonDownFcn',@ButtonDownFcn);
set(gcf,'WindowButtonUpFcn',@ButtonUpFcn);

% set(gcf,'WindowButtonDownFcn',@ButttonDownFcn);

function ButtonDownFcn(src,event)
pt = get(gca,'CurrentPoint');    %获取当前点坐标
x = pt(1,1);
y = pt(1,2);
set(gcf,'WindowButtonMotionFcn',@ButtonMotionFcn); %设置鼠标移动响应
fprintf('x=%f,y=%f\n',x,y);
plot(x,y,'*');

function ButtonMotionFcn(src,event)
pt = get(gca,'CurrentPoint');
x = pt(1,1);
y = pt(1,2);
plot(x,y,'*');
fprintf('x=%f,y=%f\n',x,y);

function ButtonUpFcn(src,event)
set(gcf, 'WindowButtonMotionFcn', '');    %取消鼠标移动响应

最后，这篇博客貌似不错，记录一下，以备不时之需。http://blog.sina.com.cn/s/blog_6163bdeb0100q7iu.html