I have a 2XN vector of points. I'd like to plot it and then enable the user to select one of the points by clicking on that point. I guess I can do it by myself by getting the mouse coordinates and select the point closest to them etc. I am wondering whether matlab provides a plug-and-play method for doing this?
There is no easy way to accomplish this, as far as I know.
You can do one of the following:
Check the distance and select the closest point (As you said yourself)
Call the plot command N times, and assign a different callback for each plot.
In this case you create the graphics in the following way:
for i=1:N
plot( X(i),Y(i), 'o', 'ButtonDownFcn', #(x)CallBack(x,i));
end
And the callbacks look like that:
function CallBack(x,i)
fprintf(1,'A callback on P[%d] was called');
end
If you want a special case of 2xN points: a draggable polygon, you can use the impoly command instead.
Related
For the function z= 10+pow((x-2),2)+pow((y+5),2), I want to represent in a 3D plot every value of z for each (x,y) pair , with a display delay before each new value of z (like a moving point).
The values for x,y are read from files.
I tried to modify Jacobs code from Creating a point moving along a graph in MATLAB, but I couldn't get it to work for my 2 variable function.
I would like a general solution, because I will also need this plotting for a N-variable function.
Have a look at the following question and see if it answers yours:
animate plot / trajectory in matlab / octave
I want to have a program in matlab with GUI, at run the program, user can draw anythings with mouse on the axes in GUI, and i want to saving created image in a matrix. how can i to do this?
Finally i find a good code and i have changed some parts for customizing for me. with this way, user can drawing anythings in the axes with mouse :
function userDraw(handles)
%F=figure;
%setptr(F,'eraser'); %a custom cursor just for fun
A=handles.axesUserDraw; % axesUserDraw is tag of my axes
set(A,'buttondownfcn',#start_pencil)
function start_pencil(src,eventdata)
coords=get(src,'currentpoint'); %since this is the axes callback, src=gca
x=coords(1,1,1);
y=coords(1,2,1);
r=line(x, y, 'color', [0 .5 1], 'LineWidth', 2, 'hittest', 'off'); %turning hittset off allows you to draw new lines that start on top of an existing line.
set(gcf,'windowbuttonmotionfcn',{#continue_pencil,r})
set(gcf,'windowbuttonupfcn',#done_pencil)
function continue_pencil(src,eventdata,r)
%Note: src is now the figure handle, not the axes, so we need to use gca.
coords=get(gca,'currentpoint'); %this updates every time i move the mouse
x=coords(1,1,1);
y=coords(1,2,1);
%get the line's existing coordinates and append the new ones.
lastx=get(r,'xdata');
lasty=get(r,'ydata');
newx=[lastx x];
newy=[lasty y];
set(r,'xdata',newx,'ydata',newy);
function done_pencil(src,evendata)
%all this funciton does is turn the motion function off
set(gcf,'windowbuttonmotionfcn','')
set(gcf,'windowbuttonupfcn','')
The ginput function gets the coordinates of moueclicks within a figure. You could use these as points of a line, polygon, etc.
If this doesn't fit your needs you need to decribe what exactly you expect the user to draw.
For freehand drawing this might be helpful:
http://www.mathworks.com/matlabcentral/fileexchange/7347-freehanddraw
The only way I know to interact with matlab windows using a mouse is ginput, but this will now let you draw anything with fluidity.
There are ways to use Java Swing components in matlab check http://undocumentedmatlab.com/ for more info.
EDIT: You may want to check this out as well.
http://blogs.mathworks.com/videos/2008/05/27/advanced-matlab-capture-mouse-movement/
In Matlab 2011b, I have a multidimensional matrix which is to be initially presented as a 2D plot of 2 of its dimensions. I wish to make the markers clickable with the left mouse button. Clicking on a marker draws a new figure of other dimensions sliced by the clicked value.
This question is related to Matlab: Plot points and make them clickable to display informations about it but I want to run a script, not just pop up data about the clicked point.
Googling hinted that ButtonDownFcn could be used, but examples I found require manually plotting each point and attaching a handler, like so:
hp = plot(x(1), y(1), 'o');
set(hp, 'buttondownfcn', 'disp(1)');
As there are many markers in the main graph, is it possible to just attach a handler to the entire curve and call the subgraph-plotting function with the index (preferable) or coordinates of the marker clicked?
this is an idea of what you need, and should help get you started if I understand your requirements.
In this case, when you select a curve, it will draw it in the bottom subplot preserving the color.
function main
subplot(211)
h = plot (peaks);
set (h,'buttondownfcn', #hitme)
end
function hitme(gcbo,evendata)
subplot (212)
hold on;
col = get (gcbo,'Color');
h2 = plot (get (gcbo,'XData'),get (gcbo,'YData'));
set (h2,'Color', col)
pt = get (gca, 'CurrentPoint');
disp (pt);
end
You can explore your options for get by simply writing get(gcbo) in the hitme function.
I am trying to get the y coordinates on a xy plot by clicking on the plot. This is very similar to the function ginput which will generate a cursor and by clicking on the plot you can get the x and y coordinates where the cursor is placed. However, for my particular purpose, I want to have a line cross the figure instead of cursor as a guide of determining the right y value to use. Is there any function in matlab can do this? If not, what is the way to do it? Any help is greatly appreciated.
I don't believe there is a pre-packaged function for that, but you can do it using the strategies described in this video tutorial from Doug Hull, with slight modifications.
I would like to plot a vertical line (I'd prefer any orientation, but I'd be happy with just vertical right now) with two-color dashes, say red-blue-red-blue-...
I know I could do it like this:
plot([1,1],[0,1],'r'),
hold on,
plot([1,1],[0,1],'--b')
However, since I need to be able to move the line, among others, it should only have a single handle. How could I do this?
EDIT
Thank you for your answers. I guess I should indeed give some more information.
I have some data that is classified into different parts. I want to be able to manually adjust the boundaries between classes. For this, I'm drawing vertical lines at the classification boundaries and use draggable to allow moving the lines.
For the boundary between the red and the blue class, I'd like to have a red/blue line.
plot(ones(10,1),linspace(0,1,10),'-bs','MarkerFaceColor','r','MarkerEdgeColor','none','linewidth',6)
is what I'm actually using at the moment. However, it's not so pretty (if I want equal spacing, it becomes a real pain, and I want to give both colors the same weight), and I would like to have the possibility to use three colors (and not with marker edge and face being different, because it makes my eyes bleed).
Unfortunately, draggable does not allow me to use multiple handles, and grouping the lines with hggroup does not seem to create a draggable object.
cline looks like a promising approach, but rainbow colors won't work for my application.
You can use the code you have, and just concatenate the handles from each line into a vector of handles. When you want to change the properties of both lines simultaneously, the SET function is able to accept the vector of handles as an argument. From the documentation for SET:
set(H,'PropertyName',PropertyValue,...)
sets the named properties to the
specified values on the object(s)
identified by H. H can be a vector of
handles, in which case set sets the
properties' values for all the
objects.
Here's an example:
h1 = plot([1 1],[0 1],'r'); %# Plot line 1
hold on;
h2 = plot([1 1],[0 1],'--b'); %# Plot line 2
hVector = [h1 h2]; %# Vector of handles
set(hVector,'XData',[2 3]); %# Shifts the x data points for both lines
UPDATE: Since you mention you are using draggable from the MathWorks File Exchange, here's an alternate solution. From the description of draggable:
A function which is called when the
object is moved can be provided as an
optional argument, so that the
movement triggers further actions.
You could then try the following solution:
Plot your two lines, saving the handle for each (i.e. h1 and h2).
Put the handle for each in the 'UserData' property of the other:
set(h1,'UserData',h2);
set(h2,'UserData',h1);
Create the following function:
function motionFcn(hMoving) %# Currently moving handle is passed in
hOther = get(hMoving,'UserData'); %# Get the other plot handle
set(hOther,'XData',get(hMoving,'XData'),... %# Update the x data
'YData',get(hMoving,'YData')); %# Update the y data
end
Turn on draggable for both lines, using the above function as the one called when either object is moved:
draggable(h1,#motionFcn);
draggable(h2,#motionFcn);
I've never used it, but there's a submission by Sebastian Hölz called CLINE on the Mathworks File Exchange that seems related.
I don't know how to do exactly what you want, but presumably the reason you want to do this is to have some way of distinguishing this line from other lines. Along those lines, take a look at MathWorks' documentation on 2-D line plots. Specifically, this example:
plot(x,y,'--rs','LineWidth',2,...
'MarkerEdgeColor','k',...
'MarkerFaceColor','g',...
'MarkerSize',10)
should give you plenty of ideas for variation. If you really need the two-color dashes, it might help to specify why. That way, even if we can't answer the question, perhaps we can convince you that you don't really need the two-color dashes. Since you've already ruled out the over-lapping solution, I'm fairly certain there's no solution that answers all of your needs. I'm assuming the two-colorness is the most fluid of those needs.