s_cplot.m

地震、测井方面matlab代码,解释的比较详细

function aux=s_cplot(seismic,varargin)
% Function plots seismic data in color-coded form form. 
% Written by E. R., May 16, 2000
% Last updated: August 22, 2005; add scrollbar menu
%
%             s_cplot(seismic,varargin)
% INPUT
% seismic     seismic structure
% varargin    one or more cell arrays; the first element of each cell array is a keyword,
%             the other elements are parameters. Presently, keywords are:
%     'annotation'  header mnemonic to use for the horizontal axis
%             Default: {'annotation','trace_no'}
%     'clim'  two numbers representing fractions of the difference between smallest and 
%             largest sample  value (see also keyword 'limits') to compute lower and 
%             upper limits limit of values to which colors will be assigned.
%             limits(1)=min(seismic.traces) + (max(seismic.traces)-min(seismic.traces)*clim(1)
%             limits(2)=max(seismic.traces) - (max(seismic.traces)-min(seismic.traces)*clim(2)
%             Default: {'clim',0.3333,0.3333}
%     'colorbar' plot colorbar; possible values are 'yes' and 'no'.
%             Default: {'colorbar','yes'}
%     'colormap'  colormap to use to map seismic amplitudes to color. Can be 
%             any of those predefined in MATLAB (such as 'copper','hot'); 
%             type "help graph3d" in MATLAB for a list of color maps. 
%             In addition {'colormap','gray'} creates a gray-scale color map 
%             (the smaller the value the darker the color)
%             Default: {colormap,''}; this creates a blue-to-red colormap
%     'direction'  plot direction. Possible values are: left-to-right, 'l2r', and right-to-left, 'r2l'.
%             Default: {'direction','l2r') 
%     'figure'   Specifies if new figure should be created or if the seismic traces 
%             should be plotted to an existing figure. Possible values are 'new' and any 
%             other string. 
%             Default: {'figure','new'} 
%     'flip_colors' keyword to flip colormap (e.g. the default "blue-to-red" 
%             colormap is converted to "red-to-blue"); possible values are 'yes' and
%             any other string.
%             Default: {'flip_colors','no'}
%     'interpol'    2-element cell array {'interpol','no'|'cubic'}
%             Default: {'interpol','cubic'}
%     'limits' lower and upper limit of values to which colors will be assigned; if given 
%             overrides parameters given via keyword 'clim'. Default: {'limits',[],[]}
%             specifies how data should be interpolated in time
%     'orient' Plot orientation. Possible values are: 'portrait' and 'landscape'
%             Default: {'orient','landscape'}
%     'polarity'    2-element cell array. Possible values are 1 and -1;
%             Default: {'polarity',1}
%     'scale'       2-element cell array which specifies if individual traces should be 
%             scaled relative to one another.  Possible values are: 'yes' and 'no'.
%             Default: {'scale','no'}
%     'times'       2-element or 3-element cell array {'times',vector of first and last time to plot}
%             or ('times',first,last}. Default: {'times',seismic.first,seismic.last} which is
%             equivalent to {'times',[seismic.first,seismic.last]}
%     'traces'      2-element or 3-element cell array. The second element can be an array of 
%             trace numbers or it can be a string. If it is a string it can be a header 
%             mnemonic or it can contain a logical expression involving header values to 
%             include. A "pseudo-header" 'trace_no' can also be used.
%             If the second element is a string containing a header mnemonic there must 
%             be a third element containing a vector of values. (see "s_select")
%             Default:  {'traces',[]} which is equivalent to 
%                       {'traces',1:ntr} where ntr denotes the number of traces in the 
%                              input data set (ntr = size(seismic.traces,2))
%     'tracking' track cursor; possible values are 'yes' and 'no'
%             Default: {'tracking','yes'}
%     'time_lines'  Two-element or three-element cell array. the second and third element
%             indicate time intervals at multiples of which timing lines will be plotted.
%             The timing lines of the third element (if given, are thicker than those of 
%             the first. No timing lines are plotted if {'time_lines',[]}.
%             Default: {'time_lines',500,1000}   
%     'title'       2-element cell array. The second element is a plot title.
%             Default: {'title',data_set_name}, implying no title
% OUTPUT
% aux         structure with information about the plot
%     'figure_handle'    handle of the figure with plot (provided {'figure','new'})

global S4M

if isempty(S4M)
   presets
   S4M.script='';
end

if nargout > 0
    aux.figure_handle=[];
end

if ~isstruct(seismic)
   seismic=s_convert(seismic,1,1);
   seismic.units='Samples';
end

[nsamp,ntr]=size(seismic.traces);
if nsamp == 1
   disp('Only one sample per trace; data set not plotted')
   return
end

%     Set default values
param.annotation='trace_no';
param.clim={0.3333,0.3333};
param.colorbar='yes';
param.colormap=[];
param.direction='l2r';
param.figure='new';
param.figure_only='no';
param.flip_colors='no';
param.interpol='cubic';
param.limits=cell(1,2);
param.npixels=100;
param.orient='landscape';
param.polarity=1;
param.scale='no';
param.subplot=[];
param.time_lines={500,1000};
param.times=[];
param.traces=[];
param.tracking='yes';
param.title=seismic.name;

%       Decode input arguments
param=assign_input(param,varargin,'s_cplot');

% default_cm=@default_seismic_colormap;

if length(param.traces) <= 1
   seismic=s_select(seismic,{'traces',param.traces});
else
   seismic=s_select(seismic,{'traces',param.traces{1},param.traces{2}});
end
if length(param.times) <= 1
      seismic=s_select(seismic,{'times',param.times});
   elseif iscell(param.times)
      seismic=s_select(seismic,{'times',param.times{1},param.times{2}});
   else
      seismic=s_select(seismic,{'times',param.times(1),param.times(2)});
   end


[nsamp,ntr]=size(seismic.traces);
if nsamp == 1
   disp('Only one sample per trace; data set not plotted')
   return
end
%if ntr == 1
%   alert(' Only one trace; data set not plotted')
%end

%     Change polarity if necessary
if param.polarity < 0
   seismic.traces=-seismic.traces;
end

%     Interpolate data in time if necessary
if strcmpi(param.interpol,'cubic') & nsamp < param.npixels
   npix=round(param.npixels/(nsamp-1))*(nsamp-1);
   dti=(seismic.last-seismic.first)/npix;
   times=(seismic.first:dti:seismic.last)';
   yi=interp1(seismic.first:seismic.step:seismic.last,seismic.traces,times,'cubic');
else
   dti=seismic.step;
   yi=seismic.traces;
end

trace_max=median(abs(yi));

%     Compute horizontal trace locations
xi=s_gh(seismic,param.annotation);
if min(xi) == max(xi)  &  ntr  >  1
   error([' Header requested for annotation (',param.annotation,') is constant'])
end

if strcmpi(param.figure,'new')
   if strcmpi(param.orient,'portrait')
      figure_handle=pfigure;
   else
      figure_handle=lfigure;
   end
%   
%   pause(1)
%   disp('here')
%   figure_handle,seismic,param.direction
else
   figure_handle=gcf;
end

if nargout > 0
   aux.figure_handle=figure_handle;
end
set(figure_handle,'DoubleBuffer','on')
if ntr > 1
   dxi=min(diff(xi))*0.5;
else
   dxi=0.5;
end

axis([min(xi)-dxi,max(xi)+dxi,seismic.first,seismic.last])
ha=get(figure_handle,'CurrentAxes');
set(ha,'TickDir','out')
hold on
set(ha,'ydir','reverse')
set(ha,'XAxisLocation','top');

cseismic_scrollbar_menu(figure_handle,seismic,param.direction)
figure_export_menu(figure_handle);

%    Handle reversal of plot direction
if strcmpi(param.direction,'r2l')
   set(ha,'xdir','reverse')
%   yi=fliplr(yi);
elseif ~strcmpi(param.direction,'l2r')
   error(['Keyword for plot direction is wrong (',param.direction,')'])
end

if strcmpi(param.figure_only,'yes')
   return
end

%     Scale traces relative to one another
if strcmpi(param.scale,'yes')
   yi=mrt(yi,mean(trace_max)./(trace_max+eps));
%   yi=yi*spdiags(1./(trace_max+eps)',0,ntr,ntr);
end

% 	Compute limits for color display
if iscell(param.limits)
   param.limits=cat(2,param.limits{:});
end
  
ma=max(yi(~isnan(yi)));
if isempty(ma)
   iname=inputname(1);
   if strcmpi(iname,'')
      iname='data set';
   end
   alert([' All elements of ',iname,' are null values']);
   return
end
mi=min(yi(~isnan(yi)));
if ma*mi < 0
   ma=(ma-mi)*0.5;
%   ma=max(ma,-mi);
   mi=-ma;
elseif ma == mi
   ma=ma+10000*max(ma*eps,eps);
   mi=mi-10000*max(mi*eps,eps);
end
dmami=ma-mi;

if isempty(param.limits)
   if iscell(param.clim)
      param.clim=cat(2,param.clim{:});
   end
   param.limits(2)=ma-dmami*param.clim(2);
   param.limits(1)=mi+dmami*param.clim(1);
   if param.limits(1) >= param.limits(2)
      alert(' clim(1) + clim(2) must be less than 1; present values ignored')
      param.limits(1)=mi;
      param.limits(2)=ma;
   end
else
   if param.limits(1) >= param.limits(2)
      alert(' limits(1) must be less than limits(2); present values ignored')
      param.limits(1)=mi;
      param.limits(2)=ma;
   end
end

%    Plot data
cplot_no1(yi,seismic.first,dti,xi,param.direction,default_seismic_colormap, ...
     param.limits,ha,param.colorbar)

if ~isempty(param.colormap)  &  ~strcmpi(param.colormap,'default')
   try
      colormap(param.colormap);
   catch
      disp('Reqested colormap not found')
   end
end

%       Flip color matrix if requested
if strcmpi(param.flip_colors,'yes')
   if ischar(param.colormap)
      param.colormap=flipud(eval(param.colormap));
   else
      param.colormap=flipud(param.colormap);
   end
end 

myimagemenu  %	Create menu button to interactively change colors, etc.

if strcmpi(param.tracking,'yes') & strcmpi(param.figure,'new')
%	Add cursor tracking
   [dummy,xinfo]=s_gh(seismic,param.annotation);
   y=linspace(seismic.first,seismic.last,nsamp);
   yinfo=info4time(seismic);
   initiate_3d_tracking(seismic.traces,xi,y,xinfo,yinfo,{'amplitude','','Amplitude'})
end


%  Title
if ~isempty(param.title)
   if iscell(param.title)		% Handle multi-line titles
      mytitle(param.title{1})
   else
      mytitle(param.title)
   end
end

%	Add annotation of horizontal axis
xtext=s_gd(seismic,param.annotation);
hunits=s_gu(seismic,param.annotation);

if ~isempty(xtext) & ~strcmpi(xtext,'not available')
   if ~isempty(hunits) & ~strcmpi(hunits,'n/a')
      xtext=[xtext,' (',hunits,')'];
   end
   xlabel(xtext)
end

if strcmpi(param.figure,'new')
   if strcmpi(param.orient,'landscape')
      time_stamp
   else
      time_stamp_p
   end
end

if ~isempty(param.time_lines)
   if ~iscell(param.time_lines)
      param.time_lines={param.time_lines};
   end
   v=axis;
   width=1;
   for ii=1:length(param.time_lines)
      t1=ceil(v(3)/param.time_lines{ii})*param.time_lines{ii};
      temp=t1:param.time_lines{ii}:v(4);
      sgrid(temp,'h','k',width);
      width=width*1.5;
   end
end

box on
grid on; zoom 
set(ha,'gridlinestyle','-')
set(ha,'xgrid','off')
set(ha,'Layer','top')

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function cplot_no1(seis,stm,prm,xannot,plot_dir,cm,param_scale,ha,colbar)
% Function plot seismic data as image plot
%
%          cplot(seis,stm,prm,xannot,plot_dir,cm,param_scale,ha,colbar)
% INPUT
% seis   seismic traces
% stm    start time
% prm    sample interval
% xannot x-axis annotation
% plot_dir  plot direction ('l2r' or 'r2l'); default: 'l2r'
% cm     color matrix
% param_scale  a 2-element vector containing clow and chigh (see imagesc and colormap).
%
%        or by global variable param.clim which computes 
%        ma=max(seis(:)); 
%        if ma > 0
%           param_scale(2)=ma*param.clim(2);
%        else
%           param_scale(2)=ma/param.clim(2);
%        end
%        mi=min(seis(:)); 
%        if mi > 0
%           param_scale(1)=mi/param.clim(1);
%        else
%           param_scale(1)=mi*param.clim(1);
%        end
%        if param_scale(1) >= param_scale(2)
%           cc=mean(param_scale);
%           param_scale(1)=cc*(1-eps);
%           param_scale(2)=cc*(1+eps);
%        end
% ha     handle of axis

[nbin,ntr]=size(seis);

% 	Handle plot and CDP direction
if strcmp(plot_dir,'r2l') == 1 & xannot(1) < xannot(ntr), 
   flip_axis=1;
elseif strcmp(plot_dir,'r2l') ~= 1 & xannot(1) > xannot(ntr), 
   xannot=flipud(xannot(:));
   seis=fliplr(seis);
   flip_axis=1;
elseif strcmp(plot_dir,'r2l') == 1 & xannot(1) > xannot(ntr),
   xannot=flipud(xannot(:));
   flip_axis=0;
   seis=fliplr(seis);
else
   flip_axis=0;
end

%axis([xannot(1)-0.5,xannot(ntr)+0.5,stm,stm+(nbin-1)*prm])
if ~isempty(param_scale)
   handle=imagesc(xannot,stm:prm:(nbin-1)*prm+stm,seis,param_scale);
else
   handle=imagesc(xannot,stm:prm:(nbin-1)*prm+stm,seis);
end 
set(handle,'Tag','image_displayed') % Create tag for image object which is
%  
% used in "myimagemenu"
try
   colormap(cm),
catch
end
if strcmpi(colbar,'yes')
   colorbar;
end
%colormap('colorcube')
set(ha,'XAxisLocation','top');
set(ha,'YDir','Reverse');
if flip_axis == 1,
   set(ha,'XDir','Reverse');
end