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moveDataCursor.m
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Thu, Feb 20, 17:36

moveDataCursor.m
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function moveDataCursor(hThis,hDataCursor,direc)
% MOVEDATACURSOR Move the data cursor
%
% Thanks to <a href="http://www.mathworks.com/matlabcentral/profile/authors/3354683-yaroslav">Yaroslav Don</a> for his assistance in updating cursorbar for
% MATLAB Graphics and for his contribution of new functionality.
% Copyright 2003-2016 The MathWorks, Inc.
% Change Log:
% 13 Feb 2015: First version posted on the MathWorks file exchange.
% 14 May 2015: Added logarithmic scale support.
pos = hDataCursor.Position;
hTarget = hThis.Target;
hAxes = get(hThis,'Parent');
xdir = get(hAxes,'XDir');
ydir = get(hAxes,'YDir');
if all(isTargetChart(hThis))
% determine next vertex
x = pos(1);
y = pos(2);
XData = hThis.TargetXData;
YData = hThis.TargetYData;
switch hThis.Orientation
case 'vertical'
% determine what the next possible X value is
switch xdir
case 'normal'
switch direc
case 'right'
% find next largest x value
ind = localNextIndex(x,XData,'greater');
pos(1) = XData(ind);
pos(2) = YData(ind);
case 'left'
% find next smallest x value
ind = localNextIndex(x,XData,'less');
pos(1) = XData(ind);
pos(2) = YData(ind);
otherwise
% do nothing
end
case 'reverse'
switch direc
case 'right'
% find next smallest x value
ind = localNextIndex(x,XData,'less');
pos(1) = XData(ind);
pos(2) = YData(ind);
case 'left'
% find next largest x value
ind = localNextIndex(x,XData,'greater');
pos(1) = XData(ind);
pos(2) = YData(ind);
otherwise
% do nothing
end
end
case 'horizontal'
% determine what the next possible Y value is
switch ydir
case 'normal'
switch direc
case 'up'
% find next largest x value
ind = localNextIndex(y,YData,'greater');
pos(1) = XData(ind);
pos(2) = YData(ind);
case 'down'
% find next smallest x value
ind = localNextIndex(y,YData,'less');
pos(1) = XData(ind);
pos(2) = YData(ind);
otherwise
% do nothing
end
case 'reverse'
switch direc
case 'up'
% find next smallest x value
ind = localNextIndex(y,YData,'less');
pos(1) = XData(ind);
pos(2) = YData(ind);
case 'down'
% find next largest x value
ind = localNextIndex(y,YData,'greater');
pos(1) = XData(ind);
pos(2) = YData(ind);
otherwise
% do nothing
end
end
end
elseif numel(hTarget) == 1 && isa(hTarget,'matlab.graphics.axis.Axes')
pixperdata = getPixelsPerData(hThis);
switch hThis.Orientation
case 'vertical'
switch xdir
case 'normal'
switch direc
case 'right'
xoffset = + 1/pixperdata(1);
case 'left'
xoffset = - 1/pixperdata(1);
otherwise
% do nothing
end
case 'reverse'
switch direc
case 'right'
xoffset = - 1/pixperdata(1);
case 'left'
xoffset = + 1/pixperdata(1);
otherwise
% do nothing
end
end
case 'horizontal'
switch ydir
case 'normal'
switch direc
case 'up'
yoffset = + 1/pixperdata(2);
case 'down'
yoffset = - 1/pixperdata(2);
otherwise
% do nothing
end
case 'reverse'
switch direc
case 'up'
yoffset = - 1/pixperdata(2);
case 'down'
yoffset = + 1/pixperdata(2);
otherwise
% do nothing
end
end
otherwise
% not vertical or horizontal
end
% assert proper scale
x = pos(1);
y = pos(2);
%
switch [hAxes.XScale '-' hAxes.YScale]
case 'linear-linear'
pos = [x+xoffset, y+yoffset, 0];
case 'log-linear'
pos = [x*10^xoffset, y+yoffset, 0];
case 'linear-log'
pos = [x+xoffset, y*10^yoffset, 0];
case 'log-log'
pos = [x*10^xoffset, y*10^yoffset, 0];
end
else
% not lines or an axes
end
hDataCursor.Position = pos;
function ind = localNextIndex(d,Data,cmp)
switch cmp
case 'greater'
ind = find(Data > d);
if isempty(ind)
ind = length(Data);
return
end
ind = min(ind);
case 'less'
ind = find(Data < d);
if isempty(ind)
ind = 1;
return
end
ind = max(ind);
end

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