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