How to Execute Something When a Graphics Object is Left-Clicked?

I want the red rectangle to turn green when I only “left-click” (not right-click or middle click) on it. What is the easiest solution?

hax = axes('XLim', [0 4], 'YLim', [0 4]);
r = rectangle('Position', [1 1 1 1], 'FaceColor', 'r');

Answer 1

[Jan]

function test
FigH = figure;
hax = axes('XLim', [0 4], 'YLim', [0 4]);
r = rectangle('Position', [1 1 1 1], 'FaceColor', 'r', ...
              'ButtonDownFcn', {@RectClickCB, FigH});

function RectClickCB(RectH, EventData, FigH)
switch get(FigH, 'SelectionType')
case 'normal'  % Left click
  set(RectH, 'FaceColor', 'g');
case 'alt'     % Right click
case 'extend'  % Middle click
otherwise
  ...
end