MATLAb-----7--------如何动态显示鼠标的坐标值和图像像素值

MATLAB如何动态显示鼠标的坐标值和图像像素值
http://apps.hi.baidu.com/share/user/41caedc2bda36d61746c6162330a
(1)fix(x) : 截尾取整.

>> fix( [3.12 -3.12])

ans =

3 -3

(2)floor(x):不超过x 的最大整数.(高斯取整)

>> floor( [3.12 -3.12])

ans =

3 -4

(3)ceil(x) : 大于x 的最小整数

>> ceil( [3.12 -3.12])

ans =

4 -3

(4)四舍五入取整

>> round(3.12 -3.12)

ans =

0

>> round([3.12 -3.12])

ans =

3 -3

对于动态显示鼠标的坐标值和像素值，在其他语言如vc,vb中都比较方便，有直接的着方面的函数，那么在matlab图像处理里面又如何实现呢？

具体的实现方法很多，但归结起来就是获取坐标轴的current point 属性值，我这里给出的一个函数是从mathworks 获取柄稍作修改后的结果，相信对做图像处理的朋友有一定的作用。另一个就是自带的pixval函数。谁有不同的实现方法，请多多共享啊！

function dynpoint(arg,h)

% Show the coordinates of a plot dynamically

%

% To start use:

% dynpoint(h)

% where h is a handle to a figure, axes or e.g. line.

%

% To delete use:

% dynpoint('delete',h)

% where h is a handle to a figure, axes or e.g. line.

% (you may also use: dynpoint delete)

%

% There can only be one dynamic plotter in a figure at a time.

%

% Example:

% subplot(211), hline = plot(sin(1:10))

% subplot(212), plot(sin(1:100))

% dynpoint(hline)

% 2002,6.29

if ~exist('arg','var')

arg = gcf;

end

if ~isstr(arg)

handle = arg;

arg = 'init';

end

switch arg

case 'init'

if ~ishandle(handle)

error('h is not a handle')

end

[h,ax] = h2hax(handle);

% delete old dynamic text object

ht = findobj(h,'tag',[mfilename '_text']);

if any(ht)

delete(ht)

end

% text window at the bottom left corner

% text in centred

uicontrol(h,...

'style','text',...

'pos',[2 2 200 15],...

'tag',[mfilename '_text'],...

'userdata',ax(1))

% do the dynamic thing...

set(h,'windowbuttonmotionfcn',[mfilename ' move'])

case 'move'

ht = findobj(gcbf,'tag',[mfilename '_text']);

ax = overobj('axes');

if ~any(ax)

ax = get(ht,'userdata');

end

p = get(ax,'currentpoint');

set(ht,'string',sprintf('(%g, %g)', p(1), p(3)));

case 'delete'

if ~exist('h','var')

h = gcf;

end

[h,ax] = h2hax(h);

set(h,'windowbuttonmotionfcn','')

ht = findobj(h,'tag',[mfilename '_text']);

delete(ht)

end

% ----------

function [h,ax]=h2hax(handle)

typ = get(handle,'type');

if strcmp(typ,'figure')

h = handle;

ax = findobj(h,'type','axes');

elseif strcmp(typ, 'axes')

h = get(handle,'parent');

ax = handle;

elseif strcmp( get(get(handle,'parent'), 'type'), 'axes' )

ax = get(handle,'parent');

h = get(ax,'parent');

end