ivan@77: function P = thumbPlot(P,x,y,color)
ivan@77: 
ivan@77: %   Copyright 2008, Ewout van den Berg and Michael P. Friedlander
ivan@77: %   http://www.cs.ubc.ca/labs/scl/sparco
ivan@77: %   $Id: thumbPlot.m 1040 2008-06-26 20:29:02Z ewout78 $
ivan@77: 
ivan@77: m = size(P,1);
ivan@77: n = size(P,2);
ivan@77: if (size(P,3) == 0) & (length(color) == 3)
ivan@77:   % Convert to gray-scale
ivan@77:   color = 0.30*color(1) + 0.59*color(2) + 0.11*color(3);
ivan@77: end
ivan@77: 
ivan@77: mnx = min(x);  % Minimum x
ivan@77: mxx = max(x);  % Maximum x
ivan@77: mny = min(y);  % Minimum y
ivan@77: mxy = max(y);  % Maximum y
ivan@77: dy  = (mxy - mny) * 0.1;   % Offset on vertical axis
ivan@77: sx  = (mxx - mnx) * 1.0;   % Scale of horizontal axis
ivan@77: sy  = (mxy - mny) * 1.2;   % Scale of vertical axis
ivan@77: 
ivan@77: if (sx < 1e-6), sx = 1; end
ivan@77: if (sy < 1e-6), sy = 1; end
ivan@77: 
ivan@77: for i=1:length(x)-1
ivan@77:    x0 = floor(1 + (n-1) * (x(i  ) - mnx) / sx);
ivan@77:    x1 = floor(1 + (n-1) * (x(i+1) - mnx) / sx);
ivan@77:    y0 = floor(    (n-1) * (y(i  ) - mny + dy) / sy);
ivan@77:    y1 = floor(    (n-1) * (y(i+1) - mny + dy) / sy);
ivan@77:    
ivan@77:    samples = 1+2*max(abs(x1-x0)+1,abs(y1-y0)+1);
ivan@77:    c       = linspace(0,1,samples);
ivan@77:    idx     = round((1-c)*x0 + c*x1);
ivan@77:    idy     = n - round((1-c)*y0 + c*y1);
ivan@77:    for j=1:samples
ivan@77:       P(idy(j),idx(j),:) = color;
ivan@77:    end
ivan@77: end