Hi Kovacs,
I understand that you want to magnify a segment of plot in MATLAB patch figure. I have considered the following patch plot for the rest of the answer whose implementation in MATLAB is as follows. I have annotated the desired region with a red rectangle.
% assuming a sample data for plotting patch
x = [2; 4; 6];
y = [4; 5; 4];
c = [0; 6; 4];
figure
patch(x,y,c) % create a patch plot
% red rectangle indicates the segment to be magnified
rectangle('Position',[3 4.4 1 0.4],'EdgeColor','r','LineWidth',2);
colorbar
Method 1: specifying the axes limits using xlim and ylim to zoom into the desired region
In this method, you tweak the limits of the x and y axis to extract the desired portion from the figure. Additionaly, you can leverage daspect function to control data unit length along each axis. It should be noted that, this method overwrites the original plot in the figure and illustrates only the zoomed segment. Here is the code snippet to implement the method.
zoomedInRegion = ([3 4 4.4 4.8]); % area of interest
% modifying the x and y limits
xlim(zoomedInRegion(1:2));
ylim(zoomedInRegion(3:4));
daspect('auto'); % adjust the aspect ratio of axis if required
Method 2: creating a new axis in the same figure to represent the zoomed segment
In case you wish to wish to observe the original plot as well as the zoomed segment on the same figure, you can create a new axes on the same figure and position it accordingly. Now you can utilise copyobj and findobj functions to recreate the patch plot on the new axis. Further, adjust the x and y limits to zoom into the desired region. Here is the code snippet for your reference
axNew = axes('Position',[.7 .7 .2 .2]); % creating a new axes and positioning it
copyobj(findobj('Type', 'patch'), axNew); % copying the patch plot to new axes
% adjuisting x and y limits to zoom into the suitable area
zoomedInRegion = ([3 4 4.4 4.8]); % area of interest
% modifying the x and y limits for the new axes
axNew.XLim = zoomedInRegion(1:2);
axNew.YLim = zoomedInRegion(3:4);
annotation('textarrow',[.52 .64],[.64 .8]) % adding arrow annotation
Apart from the methods mentioned above, have a look at following tools on File Exchange
I hope this helps.
