Documentation of quiver_label_giso

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Function Synopsis

q = quiver_label_giso(u,scale,xtext,ytext,type)

Help text

 USAGE: quiver_label_giso(U,scale,xtext,ytext,type)

 Puts a "scale" vector on a map from the Map Toolbox

 U = magnitude of scale vector
 scale = scale of vectors plotted
 xtext = left position of text
 ytext = y-position of text and scale vector
 type = arrow parameters (from quiver)

 PROBLEM:  First, we should note that there is no 'good' way
 to draw arrows in MATLAB, unless the map is evenly spaced in
 the x and y directions.  Unless the grid is evenly spaced, 
 the arrow length will not be correct - there's no way around
 that.  As a result, this should only be used for 'giso' 
 projection - or for evenly spaced projections.  Use at your
 own discretion.

Cross-Reference Information

Listing of function quiver_label_giso

function q = quiver_label_giso(u,scale,xtext,ytext,type)

isheld = ishold;
if ~isheld; hold on; end;

if nargin < 5; type = '-k'; end

%  Get x and y limits
xx1 = get(gca, 'XLim'); yy1 = get(gca, 'YLim');
xx2 = getm(gca, 'MapLonLimit'); yy2 = getm(gca, 'MapLatLimit');

scalex = diff(xx1)/diff(xx2);
scaley = diff(yy1)/diff(yy2);

xtext2 = xx1(1)+scalex*(xtext-xx2(1));
ytext2 = yy1(1)+scaley*(ytext-yy2(1));
%xarrow2 = xx1(1)+scalex*(xarrow-xx2(1));
u2 = u*scalex;

q1 = text(xtext2,ytext2,sprintf('Scale: %1.4g m/s =  ',u),'FontSize',8)
set(q1, 'HorizontalAlignment', 'right');
q2 = quiver_scale(xtext2,ytext2,u2,0,scale,type);
set(q2,'Clipping','off')
if nargout == 1;
  q = [q1; q2];
end

if ~isheld; hold off; end;