Hi,
I'am relatively new to MATLAB and got a problem concerning the figure's 'WindowButtonUpFcn' if you want to use it for modifying several plots on the same figure.
Preface: I've got a figure whereon I plot several graph plots (using subplot) along with additonal marker plots to identify characteristic spots on the individual curves. After the plotting is done the user can manually adjust the locations of the automatic found marker spots by mouse-dragging. Before the dragging occurs the 'XLim' and 'YLim' of the current axis are changed to perform a 'zoom-in'. A control variable is used to check if the zoom was done and needs to be reversed.
Here is some reduced code to show my problem:
figureCBProb.m
function figureCBProb()
clc;
fHandle = figure(1);
drawPlot1(fHandle);
drawPlot2(fHandle);
end
drawPlot1.m
function drawPlot1(fHandle)
x = -2*pi:0.05:+2*pi;
subplot(1,2,1);
hplot1 = plot(x, sin(x));
hold on;
hPoint(1) = plot(0, sin(0), 'bx', 'ButtonDownFcn', @startDrag);
checkProcess = 0;
defaultYLimits = -1;
defaultXLimits = -1;
set(fHandle, 'WindowButtonUpFcn', @stopDrag);
function startDrag(varargin)
disp('Start dragging: Plot1!');
set(fHandle, 'WindowButtonMotionFcn', @doDrag);
defaultXLimits = get(gca, 'XLim');
defaultYLimits = get(gca, 'YLim');
end
function doDrag(varargin)
disp('Do some dragging: Plot1');
currentPoint = get(gca, 'CurrentPoint');
if(checkProcess == 0)
disp('Zoom-Process: Plot1');
set(gca, 'XLim', [currentPoint(1)-2 currentPoint(1)+2]);
set(gca, 'YLim', [currentPoint(3)-0.5 currentPoint(3)+0.5]);
checkProcess = 1;
end
end
function stopDrag(varargin)
disp('Dragging stopped: Plot1!');
set(fHandle, 'WindowButtonMotionFcn', '');
if(checkProcess == 1)
disp('Undo Zoom-Process: Plot1');
set(gca, 'XLim', defaultXLimits);
set(gca, 'YLim', defaultYLimits);
checkProcess = 0;
end
end
end
drawPlot2.m
function drawPlot2(fHandle)
x = -2*pi:0.05:+2*pi;
subplot(1,2,2);
hplot2 = plot(x, cos(x));
hold on;
hPoint(2) = plot(pi/2, cos(pi/2), 'bx', 'ButtonDownFcn', @startDrag);
checkProcess = 0;
defaultYLimits = -1;
defaultXLimits = -1;
set(fHandle, 'WindowButtonUpFcn', @stopDrag);
function startDrag(varargin)
disp('Start dragging: Plot2!');
set(fHandle, 'WindowButtonMotionFcn', @doDrag);
defaultXLimits = get(gca, 'XLim');
defaultYLimits = get(gca, 'YLim');
end
function doDrag(varargin)
disp('Do some dragging: Plot2');
currentPoint = get(gca, 'CurrentPoint');
if(checkProcess == 0)
disp('Zoom-Process: Plot2');
set(gca, 'XLim', [currentPoint(1)-2 currentPoint(1)+2]);
set(gca, 'YLim', [currentPoint(3)-0.5 currentPoint(3)+0.5]);
checkProcess = 1;
end
end
function stopDrag(varargin)
disp('Dragging stopped: Plot2!');
set(fHandle, 'WindowButtonMotionFcn', '');
if(checkProcess == 1)
disp('Undo Zoom-Process: Plot2');
set(gca, 'XLim', defaultXLimits);
set(gca, 'YLim', defaultYLimits);
checkProcess = 0;
end
end
end
Problem: If there is only a single graph plot (commenting out drawPlot2) everything works fine. By adding the other graph plot the stopDrag function of drawPlot1 is always 'overridden' by the stopDrag function of drawPlot2 and so the zooming in plot1 is never reversed.
Is there a way to get around this issue? I tried to work with global variables of the axis handles to detect which axis has been clicked on but it is ugly and makes things more unstructured/ complicated. I'm sure there is a much better MATLAB way. :)
Furthermore I don't want to rewrite this whole 'startDrag', 'doDrag' and 'stopDrag' for every single plot but instead write it once and apply it to each single plot. But that's another problem. ;)
Thanks in advance!
