ImageProperties.java

package ij.plugin.filter;
import ij.*;
import ij.process.*;
import ij.gui.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Locale;
import ij.measure.Calibration;

public class ImageProperties implements PlugInFilter {
    ImagePlus imp;
    static final int NANOMETER=0, MICROMETER=1, MILLIMETER=2, CENTIMETER=3,
         METER=4, KILOMETER=5, INCH=6, FOOT=7, MILE=8, PIXEL=9, OTHER_UNIT=10;
    int oldUnitIndex;
    double oldUnitsPerCm;
    double oldScale;


    public int setup(String arg, ImagePlus imp) {
        this.imp = imp;
        return DOES_ALL+NO_CHANGES;
    }

    public void run(ImageProcessor ip) {
        showDialog(imp);
    }
    
    void showDialog(ImagePlus imp) {
        Calibration cal = imp.getCalibration();
        oldUnitIndex = getUnitIndex(cal.getUnit());
        oldUnitsPerCm = getUnitsPerCm(oldUnitIndex);
        GenericDialog gd = new ImagePropertiesDialog(imp.getTitle(), this);
        gd.addStringField("Unit of Length:", cal.getUnit());
        oldScale = cal.pixelWidth!=0?1.0/cal.pixelWidth:0;
        gd.addNumericField("Pixels/Unit:", oldScale, (int)oldScale==oldScale?0:3);
        int stackSize = imp.getStackSize();
        if (stackSize>1) {
            gd.addMessage("");
            gd.addNumericField("Slice Spacing:", cal.pixelDepth, (int)cal.pixelDepth==cal.pixelDepth?0:3);
            double fps = cal.frameInterval>0.0?1/cal.frameInterval:0.0;
            gd.addNumericField("Frames per Second:", fps, (int)fps==fps?0:2);       }
        gd.showDialog();
        if (gd.wasCanceled())
            return;
        String unit = gd.getNextString();
        if (unit.equals("um"))
            unit = IJ.micronSymbol + "m";
        else if (unit.equals("u"))
            unit = "" + IJ.micronSymbol;
        else if (unit.equals("A"))
            unit = ""+IJ.angstromSymbol;
        double resolution = gd.getNextNumber();
        if (unit.equals("")||unit.equalsIgnoreCase("pixel")
        ||unit.equalsIgnoreCase("none")||resolution==0.0) {
            cal.setUnit(null);
            cal.pixelWidth = 1.0;
            cal.pixelHeight = 1.0;
        } else {
            cal.setUnit(unit);
            cal.pixelWidth = 1.0/resolution;
            cal.pixelHeight = 1.0/resolution;
        }
        if (stackSize>1) {
            double spacing = gd.getNextNumber();
            double fps = gd.getNextNumber();
            cal.pixelDepth = spacing;
            if (fps!=0.0)
                cal.frameInterval = 1.0/fps;
            else
                cal.frameInterval = 0.0;
        }
        imp.repaintWindow();
    }
    
    double getNewScale(String newUnit) {
        if (oldUnitsPerCm==0.0)
            return 0.0;
        double newScale = 0.0;
        int newUnitIndex = getUnitIndex(newUnit);
        if (newUnitIndex!=oldUnitIndex) {
            double newUnitsPerCm = getUnitsPerCm(newUnitIndex);
            if (oldUnitsPerCm!=0.0 && newUnitsPerCm!=0.0) {
                newScale = oldScale * (oldUnitsPerCm/newUnitsPerCm);
            }
        }
        return newScale;
    }
    
    int getUnitIndex(String unit) {
        unit = unit.toLowerCase(Locale.US);
        if (unit.equals("cm")||unit.startsWith("cent"))
            return CENTIMETER;
        else if (unit.equals("mm")||unit.startsWith("milli"))
            return MILLIMETER;
        else if (unit.startsWith("inch"))
            return INCH;
        else if (unit.startsWith(""+IJ.micronSymbol)||unit.startsWith("u")||unit.startsWith("micro"))
            return MICROMETER;
        else if (unit.equals("nm")||unit.startsWith("nano"))
            return NANOMETER;
        else if (unit.startsWith("meter"))
            return METER;
        else if (unit.equals("km")||unit.startsWith("kilo"))
            return KILOMETER;
        else if (unit.equals("ft")||unit.equals("foot")||unit.equals("feet"))
            return FOOT;
        else if (unit.equals("mi")||unit.startsWith("mile"))
            return MILLIMETER;
        else
            return OTHER_UNIT;
    }
    
    double getUnitsPerCm(int unitIndex) {
        switch (unitIndex) {
            case NANOMETER: return  10000000.0;
            case MICROMETER: return    10000.0;
            case MILLIMETER: return       10.0;
            case CENTIMETER: return        1.0;
            case METER: return             0.01;
            case KILOMETER: return         0.00001;
            case INCH: return              0.3937;
            case FOOT: return              0.0328083;
            case MILE: return              0.000006213;
            default: return                0.0;
        }
    }

}

class ImagePropertiesDialog extends GenericDialog {
    ImageProperties iprops;
    
    public ImagePropertiesDialog(String title, ImageProperties iprops) {
        super(title);
        this.iprops = iprops;
    }

    public void textValueChanged(TextEvent e) {
        TextField unitField = (TextField)stringField.elementAt(0);
        if (e.getSource()!=unitField)
            return;
        String newUnit = unitField.getText();
        TextField ppuField = (TextField)numberField.elementAt(0);
        double newScale = iprops.getNewScale(newUnit);
        if (newScale!=0.0) {
            ppuField.setText(((int)newScale)==newScale?IJ.d2s(newScale,0):IJ.d2s(newScale,2));
            iprops.oldUnitIndex = iprops.getUnitIndex(newUnit);
            iprops.oldUnitsPerCm = iprops.getUnitsPerCm(iprops.oldUnitIndex);
            iprops.oldScale = newScale;;
        }
    }

}