Posted by
Wayne Rasband-2 on
URL: http://imagej.273.s1.nabble.com/multi-color-overlays-tp5021290p5021292.html
> On Oct 6, 2018, at 6:35 AM, Kenneth Sloan <
[hidden email]> wrote:
>
> I'm stumbling through an attempt to use Overlays...
>
> Java plugin (not macro)
>
> I would *really* like to put overlays on a single slice of a stack containing multiple FloatProcessor images. I suspect
> that this doesn't work.
It does work. Here is an example that adds a two color overlay to the fifth slice to a 10 slice float stack:
img = IJ.createImage("Untitled", "32-bit black", 512, 512, 10);
overlay = new Overlay();
line1 = new Line(150,100,150,400);
line1.setStrokeWidth(5);
line1.setStrokeColor(Color.red);
line1.setPosition(5);
overlay.add(line1);
line2 = new Line(300,100,300,400);
line2.setStrokeWidth(15);
line2.setStrokeColor(Color.blue);
line2.setPosition(5);
overlay.add(line2);
img.setOverlay(overlay);
img.show();
img.setSlice(5);
-wayne
> So, while I verify that, I'm working with a single ImagePlus displaying a ColorProcessor.
>
> The desired Overlay has several ROI elements - each with it's own StrokeWidth and Color. Sample code fragment is shown below.
> My problem is that all the ROIs are displayed with the same color - the color assigned to the last ROI added to the Overlay.
>
> Question: is this the expected behavior? If not, what am I doing wrong? Should I be using a different technique all together?
>
> In extremis, I suppose that I could re-create the ColorProcessor image on every change to the annotation, and destructively draw the overlay information on the image - but that seems wasteful. I'd really like to leave the image intact, and simply re-create the Overlay.
>
> I suppose another option is to create an Image Roi and draw the multi-colored vector graphics on it. But, the code below seems to be the "right" way to do it. I would appreciate an explanation of why it doesn't work, and advice on the best technique to use.
>
> Here's the relevant code (everything is drawn in the right place and at the right scale, but it's all RED):
>
> // create window for centering
> ColorProcessor cpMPOD = fpMPOD.convertToColorProcessor();
>
>
> // draw overlay showing center
>
> ImagePlus ipMPOD = new ImagePlus("MPOD", cpMPOD);
> Overlay crosshairOverlay = new Overlay();
> Roi horizontalAxis = new Line(0.0, (double) this.foveaY,
> (double) width, (double) this.foveaY);
> horizontalAxis.setStrokeWidth(1.0f);
> horizontalAxis.setColor(Color.WHITE);
> crosshairOverlay.add(horizontalAxis);
>
> Roi verticalAxis = new Line((double) this.foveaX, 0.0,
> (double) this.foveaX, (double) height);
> verticalAxis.setStrokeWidth(1.0f);
> verticalAxis.setColor(Color.WHITE);
> crosshairOverlay.add(verticalAxis);
>
> double oval6Radius = 6.0*(double)width/(double)this.angle;
> double oval6X = this.foveaX - oval6Radius;
> double oval6Y = this.foveaY - oval6Radius;
> double oval6Diameter = oval6Radius * 2.0;
> Roi circle6Degree = new OvalRoi(oval6X,oval6Y,oval6Diameter,oval6Diameter);
> circle6Degree.setStrokeWidth(1.0f);
> circle6Degree.setColor(Color.GREEN);
> crosshairOverlay.add(circle6Degree);
>
> double oval2Radius = 2.0*(double)width/(double)this.angle;
> double oval2X = this.foveaX - oval2Radius;
> double oval2Y = this.foveaY - oval2Radius;
> double oval2Diameter = oval2Radius * 2.0;
> Roi circle2Degree = new OvalRoi(oval2X,oval2Y,oval2Diameter,oval2Diameter);
> circle2Degree.setStrokeWidth(1.0f);
> circle2Degree.setColor(Color.BLUE);
> crosshairOverlay.add(circle2Degree);
>
>
> double oval1Radius = 1.0*(double)width/(double)this.angle;
> double oval1X = this.foveaX - oval1Radius;
> double oval1Y = this.foveaY - oval1Radius;
> double oval1Diameter = oval1Radius * 2.0;
> Roi circle1Degree = new OvalRoi(oval1X,oval1Y,oval1Diameter,oval1Diameter);
> circle1Degree.setStrokeWidth(1.0f);
> circle1Degree.setColor(Color.RED);
> crosshairOverlay.add(circle1Degree);
>
> ipMPOD.setOverlay(crosshairOverlay);
>
> ipMPOD.show();
>
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