Method run

ij/src/main/java/ij/plugin/filter/ScaleDialog.java:37–133

(ImageProcessor ip)

	}

	public void run(ImageProcessor ip) {
		double measured = 0.0;
		double known = 0.0;
		double aspectRatio = 1.0;
		String unit = "pixel";
		boolean global1 = imp.getGlobalCalibration()!=null;
		boolean global2;
		Calibration cal = imp.getCalibration();
		Calibration calOrig = cal.copy();
		boolean isCalibrated = cal.scaled();
		String length = "0.00";
		
		String scale = "<no scale>";
		int digits = 2;
		Roi roi = imp.getRoi();
		if (roi!=null) {
			if (roi instanceof Line) {
				measured = ((Line)roi).getRawLength();
				length = IJ.d2s(measured, 2);
			} else if (roi.getType()==Roi.RECTANGLE) {
				Rectangle2D r = roi.getFloatBounds();
				measured = Math.max(r.getWidth(),r.getHeight());
				length = IJ.d2s(measured, 2);
			}
		}

		if (isCalibrated) {
			if (measured!=0.0)
				known = measured*cal.pixelWidth;
			else {
				measured = 1.0/cal.pixelWidth;
				known = 1.0;
			}
			double dscale = measured/known;
			digits = Tools.getDecimalPlaces(dscale);
			unit = cal.getUnit();
			scale = IJ.d2s(dscale, digits)+" pixels/"+unit;
			aspectRatio = cal.pixelHeight/cal.pixelWidth;
		}
		
		digits = Tools.getDecimalPlaces(measured);
		int asDigits = aspectRatio==1.0?1:3;
		SetScaleDialog gd = new SetScaleDialog("Set Scale", scale, length);
		gd.addNumericField("Distance in pixels:", measured, digits, 8, null);
		gd.addNumericField("Known distance:", known, 2, 8, null);
		gd.addNumericField("Pixel aspect ratio:", aspectRatio, asDigits, 8, null);
		gd.addStringField("Unit of length:", unit);
		gd.addPanel(makeButtonPanel(gd), GridBagConstraints.EAST, new Insets(5, 0, 0, 0));
		gd.setInsets(0, 30, 0);
		gd.addCheckbox("Global", global1);
		gd.setInsets(10, 0, 0);
		gd.addMessage("Scale: "+"12345.789 pixels per centimeter");
		gd.addHelp(IJ.URL2+"/docs/menus/analyze.html#scale");
		gd.showDialog();
		if (gd.wasCanceled())
			return;
		measured = gd.getNextNumber();
		known = gd.getNextNumber();