So far MathWorks has been very diligent in making its object properties have meaningful names, and so I assume that when the time comes to expose these properties, they will be renamed (perhaps to TextHandles, EdgeHandles and FaceHandles, or perhaps LabelHandles, LineHandles and FillHandles). Set(hContour.EdgePrims(hContour.LevelList<0), 'LineStyle', 'dotted') Ĭustomized Matlab contour lines Prediction about forward compatibilityĪs I noted on my previous post on contour plot customization, I am marking this article as “ High risk of breaking in future Matlab versions“, not because of the basic functionality (being important enough I don’t presume it will go away anytime soon) but because of the property names: TextPrims, EdgePrims and FacePrims don’t seem to be very user-friendly property names. = contour(peaks, 'ShowText','on', 'LevelStep',1) drawnow = contour ( peaks, 'ShowText', 'on', 'LevelStep', 1 ) drawnow set (hContour. To do this, we add a callback listener to the contour object’s MarkedClean event that reruns our updateContours function: We also want to call updateContours asynchronously whenever the contour is redrawn, for example, upon a zoom/pan event, or when one of the relevant contour properties (e.g., LevelStep or *Data) changes. The final stage is to call our new updateContours function directly, immediately after creating the contour plot.
CONTOUR PLOT COLOR MATLAB FREE
Feel free to experiment with other label properties. The final drawnow at the end of the function is optional: it is meant to reduce the flicker caused by the changing label colors, but it can be removed to improve the rendering performance in case of rapidly-changing contour plots.įinally, note that I added a commented line that shows we can modify other label properties (in this case, the font size from 10 to 8).
CONTOUR PLOT COLOR MATLAB UPDATE
Instead I used a very small 10*eps tolerance in the numeric comparison.Īlso note that I was careful to call drawnow at the top of the update function, in order to ensure that EdgePrims and TextPrims are updated when the function is called (this might not be the case before the call to drawnow).
Note that in this function we don’t directly equate the numeric label values to the contour levels’ values: this would work well for integer values but would fail with floating-point ones. %labels(idx).Font.Size = 8 % update the label font size Labels(idx).ColorData = lines(lineIdx).ColorData % update the label color LineIdx = find(abs(levels-labelValue)<10*eps, 1) % avoid FP errors using eps
LabelValue = str2double(labels(idx).String)
Lines = hContour.EdgePrims % undocumented/unsupported Labels = hContour.TextPrims % undocumented/unsupported ColorData % update the label color %labels(idx).Font.Size = 8 % update the label font size end drawnow % optional end LineIdx = find ( abs (levels-labelValue )< 10* eps, 1 ) % avoid FP errors using eps EdgePrims % undocumented/unsupported for idx = 1 : numel (labels ) TextPrims % undocumented/unsupported lines = hContour. Function updateContours (hContour ) % Update the text label colors drawnow % very important!
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