MATLAB: ButtonDownFcn return map coordinates

Mapping Toolbox

Is there a way to get the map coordinates from a geotiff image using graphics object callback functions for a mouse click location?

Best Answer

Obtaining the coordinates from a geotiff image is possible through the axes object properties. The 'CurrentPoint' property contains the axes points of the most recent mouse click on the axes. An example is provided below.

You can run this example by copying the code below into a script and hitting 'Run'.

figure
im = mapshow('boston.tif')
ax = gca;
im.PickableParts = 'none';
ax.ButtonDownFcn = @mouseClick;
function mouseClick(~,~)
    get(gca,'CurrentPoint')
end

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MATLAB: How to override the zoom uicontextmenu with a custom uicontextmenu, when in zoom mode, in MATLAB 7.3 (R2006b)

This can be accomplished with the zoom accessor object. The following example illustartes how this can be done:

% Define the context menu
cmenu = uicontextmenu;
% Define the line and associate it with the context menu
hline = plot(1:10,'UIContextMenu', cmenu);
% Define callbacks for context menu items
cb1 = ['set(hline, ''LineStyle'', ''--'')'];
cb2 = ['set(hline, ''LineStyle'', '':'')'];
cb3 = ['set(hline, ''LineStyle'', ''-'')'];
% Define the context menu items
item1 = uimenu(cmenu, 'Label', 'dashed', 'Callback', cb1);
item2 = uimenu(cmenu, 'Label', 'dotted', 'Callback', cb2);
item3 = uimenu(cmenu, 'Label', 'solid', 'Callback', cb3);
% Get the handle to the zoom mode object for the figure
zh = zoom(gcf);
% Set the UI Context Menu to the custom menu
set(zh, 'uicontextmenu', cmenu)

MATLAB: How to remove labels and grey space between subplots so that the subplots fill-up the entire figure

For MATLAB releases before R2019b, the following example code creates 2x2 plots, using the 'subplot' function and modifies the axes properties such that the subplots fill-up the entire figure window:

subplot(2,2,1);
[X,Y,Z] = peaks(20);
imagesc(Z);
ax = gca;
set(ax,'XTick',[], 'YTick', []);
ax.Position = [0 0.5 0.5 0.5];
subplot(2,2,2);
contour(X,Y,Z)
ax = gca;
set(ax,'XTick',[], 'YTick', []);
ax.Position = [0.5 0.5 0.5 0.5];
subplot(2,2,3);
imagesc(Z);
ax = gca;
set(ax,'XTick',[], 'YTick', []);
ax.Position = [0 0 0.5 0.5];
subplot(2,2,4);
contour(X,Y,Z);
ax = gca;
set(ax,'XTick',[], 'YTick', []);
ax.Position = [0.5 0 0.5 0.5];

There is a slightly elegant way of doing this in R2019b using the 'tiledlayout' function instead of 'subplot':

t = tiledlayout(2,2);
[X,Y,Z] = peaks(20);
% Tile 1
nexttile
imagesc(Z)
ax = gca;
set(ax,'XTick',[], 'YTick', []);
% Tile 2
nexttile
contour(X,Y,Z)
ax = gca;
set(ax,'XTick',[], 'YTick', []);
% Tile 3
nexttile
imagesc(Z)
ax = gca;
set(ax,'XTick',[], 'YTick', []);
% Tile 4
nexttile
contour(X,Y,Z)
ax = gca;
set(ax,'XTick',[], 'YTick', []);
t.Padding = 'none';
t.TileSpacing = 'none';

Note that the last two commands get rid of all the space between the tiled plots.

Best Answer

Related Solutions

MATLAB: How to override the zoom uicontextmenu with a custom uicontextmenu, when in zoom mode, in MATLAB 7.3 (R2006b)

MATLAB: How to remove labels and grey space between subplots so that the subplots fill-up the entire figure

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