MATLAB图中图绘制（局部放大图）

MATLAB图中图绘制（局部放大图）

方法1 使用magnify工具

magnify工具可以实现对绘制的figure手动选择区域，并且可以选择多个放大区域。

1. 下载magnify.m，可以点击上面的链接下载或者可以拷贝附件的代码，保存为magnify.m。然后放到工作目录下（也就是和绘图的程序同一目录。）
2. 绘制一张图figure.
3. 保证前两个工作完成，输入magnify，接着就可以选择放大区域了，右键选中想要放大的区域，可以使用‘<’和‘>’缩放方法范围，‘+’和‘-’缩放放大比例，松开右键确认。
4. 可以通过工具->编辑图形调整子图位置等。
   

方法2 手动绘制1

  此方法需要通过手动设置绘制的数据，具体的说就是需要哪一段就提取某一段的数，通过matlab自带的axes绘制子图。

clc;clear;close all;                                                                                                               
t=linspace(0,3,100);
t1=linspace(1,1.2,100);
y=sin(t);
y1=sin(t1);
figure;                                   % 大图
plot(t,y);
axis('equal');      
axes('Position',[0.2,0.5,0.3,0.3]);   % 小图 设置小图的大小和位置（左上角位置+宽高）
plot(t1,y1); 
xlim([min(t1),max(t1)]); 

方法3 手动绘制2

  此方法需要通过手动设置绘制的数据，与第二种不同的是，该方法直接绘制所有数据，但是只显示需要放大的区域。

clc;clear;close all;                                                                                                               
t=linspace(0,3,100);
y=sin(t);
figure;                                   % 大图
plot(t,y);
axis('equal');      
axes('Position',[0.2,0.5,0.3,0.3]);   % 小图 设置小图的大小和位置（左上角位置+宽高）
plot(t,y); 
xlim([1,1.2]);

附件 magnify.m（来源于matlab官网）

function magnify(f1)
%
%magnify(f1)
%
%  Figure creates a magnification box when under the mouse
%  position when a button is pressed.  Press '+'/'-' while
%  button pressed to increase/decrease magnification. Press
%  '>'/'<' while button pressed to increase/decrease box size.
%  Hold 'Ctrl' while clicking to leave magnification on figure.
%
%  Example:
%     plot(1:100,randn(1,100),(1:300)/3,rand(1,300)), grid on,
%     magnify;

% Rick Hindman - 7/29/04

if (nargin == 0), f1 = gcf; end;
set(f1, ...
   'WindowButtonDownFcn',  @ButtonDownCallback, ...
   'WindowButtonUpFcn', @ButtonUpCallback, ...
   'WindowButtonMotionFcn', @ButtonMotionCallback, ...
   'KeyPressFcn', @KeyPressCallback);
return;

function ButtonDownCallback(src,eventdata)
   f1 = src;
   a1 = get(f1,'CurrentAxes');
   a2 = copyobj(a1,f1);

   set(f1, ...
      'UserData',[f1,a1,a2], ...
      'Pointer','fullcrosshair', ...
      'CurrentAxes',a2);
   set(a2, ...
      'UserData',[2,0.2], ...  %magnification, frame size
      'Color',get(a1,'Color'), ...
      'Box','on');
   xlabel(''); ylabel(''); zlabel(''); title('');
   set(get(a2,'Children'), ...
      'LineWidth', 2);
   set(a1, ...
      'Color',get(a1,'Color')*0.95);
   set(f1, ...
      'CurrentAxes',a1);
   ButtonMotionCallback(src);
return;

function ButtonUpCallback(src,eventdata)
   H = get(src,'UserData');
   f1 = H(1); a1 = H(2); a2 = H(3);
   set(a1, ...
      'Color',get(a2,'Color'));
   set(f1, ...
      'UserData',[], ...
      'Pointer','arrow', ...
      'CurrentAxes',a1);
   if ~strcmp(get(f1,'SelectionType'),'alt'),
      delete(a2);
   end;
return;

function ButtonMotionCallback(src,eventdata)
   H = get(src,'UserData');
   if ~isempty(H)
      f1 = H(1); a1 = H(2); a2 = H(3);
      a2_param = get(a2,'UserData');
      f_pos = get(f1,'Position');
      a1_pos = get(a1,'Position');

      [f_cp, a1_cp] = pointer2d(f1,a1);

      set(a2,'Position',[(f_cp./f_pos(3:4)) 0 0]+a2_param(2)*a1_pos(3)*[-1 -1 2 2]);
      a2_pos = get(a2,'Position');

   	set(a2,'XLim',a1_cp(1)+(1/a2_param(1))*(a2_pos(3)/a1_pos(3))*diff(get(a1,'XLim'))*[-0.5 0.5]);
   	set(a2,'YLim',a1_cp(2)+(1/a2_param(1))*(a2_pos(4)/a1_pos(4))*diff(get(a1,'YLim'))*[-0.5 0.5]);
   end;
return;

function KeyPressCallback(src,eventdata)
   H = get(gcf,'UserData');
   if ~isempty(H)
      f1 = H(1); a1 = H(2); a2 = H(3);
      a2_param = get(a2,'UserData');
      if (strcmp(get(f1,'CurrentCharacter'),'+') | strcmp(get(f1,'CurrentCharacter'),'='))
         a2_param(1) = a2_param(1)*1.2;
      elseif (strcmp(get(f1,'CurrentCharacter'),'-') | strcmp(get(f1,'CurrentCharacter'),'_'))
         a2_param(1) = a2_param(1)/1.2;
      elseif (strcmp(get(f1,'CurrentCharacter'),'<') | strcmp(get(f1,'CurrentCharacter'),','))
         a2_param(2) = a2_param(2)/1.2;
      elseif (strcmp(get(f1,'CurrentCharacter'),'>') | strcmp(get(f1,'CurrentCharacter'),'.'))
         a2_param(2) = a2_param(2)*1.2;
      end;
      set(a2,'UserData',a2_param);
   	ButtonMotionCallback(src);
   end;
return;



% Included for completeness (usually in own file)
function [fig_pointer_pos, axes_pointer_val] = pointer2d(fig_hndl,axes_hndl)
%
%pointer2d(fig_hndl,axes_hndl)
%
%	Returns the coordinates of the pointer (in pixels)
%	in the desired figure (fig_hndl) and the coordinates
%       in the desired axis (axes coordinates)
%
% Example:
%  figure(1),
%  hold on,
%  for i = 1:1000,
%     [figp,axp]=pointer2d;
%     plot(axp(1),axp(2),'.','EraseMode','none');
%     drawnow;
%  end;
%  hold off

% Rick Hindman - 4/18/01

if (nargin == 0), fig_hndl = gcf; axes_hndl = gca; end;
if (nargin == 1), axes_hndl = get(fig_hndl,'CurrentAxes'); end;

set(fig_hndl,'Units','pixels');

pointer_pos = get(0,'PointerLocation');	%pixels {0,0} lower left
fig_pos = get(fig_hndl,'Position');	%pixels {l,b,w,h}

fig_pointer_pos = pointer_pos - fig_pos([1,2]);
set(fig_hndl,'CurrentPoint',fig_pointer_pos);

if (isempty(axes_hndl)),
	axes_pointer_val = [];
elseif (nargout == 2),
	axes_pointer_line = get(axes_hndl,'CurrentPoint');
	axes_pointer_val = sum(axes_pointer_line)/2;
end;