Uicontrols

uicontrols: Build a GUI in GNU Octave

You have to use the "qt" graphics toolkit (default since 4.0). For the best results GNU Octave version >= 4.2.x should be used.

Example 1: imageViewer

GUI which opens a file selection dialog when a button is pressed and views the selected image.

Code: imageViewer example

%% In file 'imageViewer.m' function imageViewer () MainFrm = figure ( ... 'position', [100, 100, 250, 350]); TitleFrm = axes ( ... 'position', [0, 0.8, 1, 0.2], ... 'color', [0.9, 0.95, 1], ... 'xtick', [], ... 'ytick', [], ... 'xlim', [0, 1], ... 'ylim', [0, 1] ); Title = text (0.05, 0.5, 'Preview Image', 'fontsize', 30); ImgFrm = axes ( ... 'position', [0, 0.2, 1, 0.6], ... 'xtick', [], ... 'ytick', [], ... 'xlim', [0, 1], ... 'ylim', [0, 1]); ButtonFrm = uicontrol (MainFrm, ... 'style', 'pushbutton', ... 'string', 'OPEN THE IMAGE', ... 'units', 'normalized', ... 'position', [0, 0, 1, 0.2], ... 'callback', { @previewImage, ImgFrm }); end %% callback subfunction (in same file) function previewImage (hObject, eventdata, ImageFrame) [fname, fpath] = uigetfile(); Img = imread (fullfile(fpath, fname)); axes(ImageFrame); imshow(Img, []); axis image off end

Then run imageViewer() from your terminal:

Example 2: demo_uicontrol

This example tries to show all available uicontrols (needs Octave >= 4.0 and qt):

Code: demo_uicontrol.m

## 20.03.2017 Andreas Weber <andy@josoansi.de> ## Demo which has the aim to show all available GUI elements. ## Useful since Octave 4.0 close all clear h graphics_toolkit qt h.ax = axes ("position", [0.05 0.42 0.5 0.5]); h.fcn = @(x) polyval([-0.1 0.5 3 0], x); function update_plot (obj, init = false) ## gcbo holds the handle of the control h = guidata (obj); replot = false; recalc = false; switch (gcbo) case {h.print_pushbutton} fn = uiputfile ("*.png"); print (fn); case {h.grid_checkbox} v = get (gcbo, "value"); grid (merge (v, "on", "off")); case {h.minor_grid_toggle} v = get (gcbo, "value"); grid ("minor", merge (v, "on", "off")); case {h.plot_title_edit} v = get (gcbo, "string"); set (get (h.ax, "title"), "string", v); case {h.linecolor_radio_blue} set (h.linecolor_radio_red, "value", 0); replot = true; case {h.linecolor_radio_red} set (h.linecolor_radio_blue, "value", 0); replot = true; case {h.linestyle_popup, h.markerstyle_list} replot = true; case {h.noise_slider} recalc = true; endswitch if (recalc || init) x = linspace (-4, 9); noise = get (h.noise_slider, "value"); set (h.noise_label, "string", sprintf ("Noise: %.1f%%", noise * 100)); y = h.fcn (x) + 5 * noise * randn (size (x)); if (init) h.plot = plot (x, y, "b"); guidata (obj, h); else set (h.plot, "ydata", y); endif endif if (replot) cb_red = get (h.linecolor_radio_red, "value"); lstyle = get (h.linestyle_popup, "string"){get (h.linestyle_popup, "value")}; lstyle = strtrim (lstyle(1:2)); mstyle = get (h.markerstyle_list, "string"){get (h.markerstyle_list, "value")}; if (strfind (mstyle, "none")) mstyle = "none"; else mstyle = mstyle(2); endif set (h.plot, "color", merge (cb_red, [1 0 0 ], [0 0 1]), "linestyle", lstyle, "marker", mstyle); endif endfunction ## plot title h.plot_title_label = uicontrol ("style", "text", "units", "normalized", "string", "plot title: (text)", "horizontalalignment", "left", "position", [0.6 0.85 0.35 0.08]); h.plot_title_edit = uicontrol ("style", "edit", "units", "normalized", "string", "Please fill me! (edit)", "callback", @update_plot, "position", [0.6 0.80 0.35 0.06]); ## grid h.grid_checkbox = uicontrol ("style", "checkbox", "units", "normalized", "string", "show grid\n(checkbox)", "value", 0, "callback", @update_plot, "position", [0.6 0.65 0.35 0.09]); h.minor_grid_toggle = uicontrol ("style", "togglebutton", "units", "normalized", "string", "minor\n(togglebutton)", "callback", @update_plot, "value", 0, "position", [0.77 0.65 0.18 0.09]); ## print figure h.print_pushbutton = uicontrol ("style", "pushbutton", "units", "normalized", "string", "print plot\n(pushbutton)", "callback", @update_plot, "position", [0.6 0.45 0.35 0.09]); ## noise h.noise_label = uicontrol ("style", "text", "units", "normalized", "string", "Noise:", "horizontalalignment", "left", "position", [0.05 0.3 0.35 0.08]); h.noise_slider = uicontrol ("style", "slider", "units", "normalized", "string", "slider", "callback", @update_plot, "value", 0.4, "position", [0.05 0.25 0.35 0.06]); ## linecolor h.linecolor_label = uicontrol ("style", "text", "units", "normalized", "string", "Linecolor:", "horizontalalignment", "left", "position", [0.05 0.12 0.35 0.08]); h.linecolor_radio_blue = uicontrol ("style", "radiobutton", "units", "normalized", "string", "blue", "callback", @update_plot, "position", [0.05 0.08 0.15 0.04]); h.linecolor_radio_red = uicontrol ("style", "radiobutton", "units", "normalized", "string", "red", "callback", @update_plot, "value", 0, "position", [0.05 0.02 0.15 0.04]); ## linestyle h.linestyle_label = uicontrol ("style", "text", "units", "normalized", "string", "Linestyle:", "horizontalalignment", "left", "position", [0.25 0.12 0.35 0.08]); h.linestyle_popup = uicontrol ("style", "popupmenu", "units", "normalized", "string", {"- solid lines", "-- dashed lines", ": dotted lines", "-. dash-dotted lines"}, "callback", @update_plot, "position", [0.25 0.05 0.3 0.06]); ## markerstyle h.markerstyle_label = uicontrol ("style", "text", "units", "normalized", "string", "Marker style:", "horizontalalignment", "left", "position", [0.58 0.3 0.35 0.08]); h.markerstyle_list = uicontrol ("style", "listbox", "units", "normalized", "string", {"none", "'+' crosshair", "'o' circle", "'*' star", "'.' point", "'x' cross", "'s' square", "'d' diamond", "'^' upward-facing triangle", "'v' downward-facing triangle", "'>' right-facing triangle", "'<' left-facing triangle", "'p' pentagram", "'h' hexagram"}, "callback", @update_plot, "position", [0.58 0.04 0.38 0.26]); set (gcf, "color", get(0, "defaultuicontrolbackgroundcolor")) guidata (gcf, h) update_plot (gcf, true);

See also

• GNU Octave manual -- GUI Development