Interactive plots
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This page shows some possibilities to create interactive OpenGL plots (qt or fltk toolkit) not using uicontrols.
See also uicontrols where you can create buttons and slider to create plots
Demo 1
| Code: imageViewer example |
clear all
graphics_toolkit qt
set (0, "defaultlinelinewidth", 2);
h.points = rand (2, 3); # 3 random points
h.line = [];
h.marker = [];
set (gcf, "userdata", h)
function down_fig (hsrc, evt)
h = get (hsrc, "userdata");
if (isempty (h.marker))
hold on
h.marker = plot (NA, NA, "o", "markersize", 15, "color", "green");
hold off
endif
set (hsrc, "userdata", h);
drag_fig (hsrc, evt);
endfunction
function drag_fig (hsrc, evt)
# evt 1:left button, 2:middle button, 3:right button
h = get (hsrc, "userdata");
if (! isempty (h.marker))
c = get (gca, "currentpoint")([1;3]);
set (h.marker, "xdata", c(1));
set (h.marker, "ydata", c(2));
# find nearest point
d = h.points - c;
[~, idx] = min (hypot (d(1, :), d(2, :)));
h.points(:, idx) = c;
endif
# draw / update the line
tmp = [h.points h.points(:,1)]; # duplicate first point to close triangle
if (isempty (h.line))
h.line = plot (tmp(1, :), tmp(2, :), "-o");
h.text = text (NA, NA, "", "horizontalalignment", "center");
## testing
axis ([0 1 0 1])
else
set (h.line, "xdata", tmp(1, :));
set (h.line, "ydata", tmp(2, :));
endif
# calculate the area
A = polyarea (h.points(1, :),
h.points(2, :));
P = mean (h.points, 2);
set (h.text, "position", mean (h.points, 2).');
set (h.text, "string", sprintf ("A = %.3f", A));
set (hsrc, "userdata", h);
endfunction
function up_fig (hsrc, evt)
h = get (gcbf, "userdata");
delete (h.marker);
h.marker = [];
set (gcbf, "userdata", h);
endfunction
set (gcf, "windowbuttondownfcn", @down_fig);
set (gcf, "windowbuttonmotionfcn", @drag_fig)
set (gcf, "windowbuttonupfcn", @up_fig)
# first update
drag_fig (gcf, [])
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