public void run(String arg) {
int wOld, hOld, wNew, hNew;
boolean fIsStack = false;
ImagePlus imp = IJ.getImage();
wOld = imp.getWidth();
hOld = imp.getHeight();
ImageStack stackOld = imp.getStack();
if ((stackOld != null) && (stackOld.getSize() > 1)) fIsStack = true;
String[] sPositions = {
"Top-Left", "Top-Center", "Top-Right",
"Center-Left", "Center", "Center-Right",
"Bottom-Left", "Bottom-Center", "Bottom-Right"
};
String strTitle = fIsStack ? "Resize Stack Canvas" : "Resize Image Canvas";
GenericDialog gd = new GenericDialog(strTitle);
gd.addNumericField("Width:", wOld, 0, 5, "pixels");
gd.addNumericField("Height:", hOld, 0, 5, "pixels");
gd.addChoice("Position:", sPositions, sPositions[4]);
gd.addCheckbox("Zero Fill", zeroFill);
gd.showDialog();
if (gd.wasCanceled()) return;
wNew = (int) gd.getNextNumber();
hNew = (int) gd.getNextNumber();
int iPos = gd.getNextChoiceIndex();
zeroFill = gd.getNextBoolean();
Prefs.set("resizer.zero", zeroFill);
int xOff, yOff;
int xC = (wNew - wOld) / 2; // offset for centered
int xR = (wNew - wOld); // offset for right
int yC = (hNew - hOld) / 2; // offset for centered
int yB = (hNew - hOld); // offset for bottom
switch (iPos) {
case 0: // TL
xOff = 0;
yOff = 0;
break;
case 1: // TC
xOff = xC;
yOff = 0;
break;
case 2: // TR
xOff = xR;
yOff = 0;
break;
case 3: // CL
xOff = 0;
yOff = yC;
break;
case 4: // C
xOff = xC;
yOff = yC;
break;
case 5: // CR
xOff = xR;
yOff = yC;
break;
case 6: // BL
xOff = 0;
yOff = yB;
break;
case 7: // BC
xOff = xC;
yOff = yB;
break;
case 8: // BR
xOff = xR;
yOff = yB;
break;
default: // center
xOff = xC;
yOff = yC;
break;
}
if (fIsStack) {
ImageStack stackNew = expandStack(stackOld, wNew, hNew, xOff, yOff);
imp.setStack(null, stackNew);
} else {
if (!IJ.macroRunning()) Undo.setup(Undo.COMPOUND_FILTER, imp);
ImageWindow win = imp.getWindow();
if (win != null && (win instanceof PlotWindow)) ((PlotWindow) win).getPlot().setFrozen(true);
ImageProcessor newIP = expandImage(imp.getProcessor(), wNew, hNew, xOff, yOff);
imp.setProcessor(null, newIP);
if (!IJ.macroRunning()) Undo.setup(Undo.COMPOUND_FILTER_DONE, imp);
}
Overlay overlay = imp.getOverlay();
if (overlay != null) overlay.translate(xOff, yOff);
}
