package ij.plugin;
import ij.*;
import ij.gui.*;
import ij.process.*;
import ij.measure.*;
import java.awt.*;

/** This plugin implements the commands in the Image/Zoom submenu. */
public class Zoom implements PlugIn{

	public void run(String arg) {
		ImagePlus imp = WindowManager.getCurrentImage();
		if (imp==null)
			{IJ.noImage(); return;}
		ImageCanvas ic = imp.getCanvas();
		if (ic==null) return;
		if (ic instanceof PlotCanvas && !((PlotCanvas)ic).isFrozen()) {
			((PlotCanvas)ic).zoom(arg);
			return;
		}
		Point loc = ic.getCursorLoc();
		if (!ic.cursorOverImage()) {
			Rectangle srcRect = ic.getSrcRect();
			loc.x = srcRect.x + srcRect.width/2;
			loc.y = srcRect.y + srcRect.height/2;
		}
		int x = ic.screenX(loc.x);
		int y = ic.screenY(loc.y);
    	if (arg.equals("in")) {
 			ic.zoomIn(x, y);
			if (ic.getMagnification()<=1.0) imp.repaintWindow();
    	} else if (arg.equals("out")) {
			ic.zoomOut(x, y);
			if (ic.getMagnification()<1.0) imp.repaintWindow();
    	} else if (arg.equals("orig"))
			ic.unzoom();
    	else if (arg.equals("100%"))
    		ic.zoom100Percent();
		else if (arg.equals("to"))
			zoomToSelection(imp, ic);
		else if (arg.equals("set"))
			setZoom(imp, ic);
		else if (arg.equals("max")) {
			ImageWindow win = imp.getWindow();
			if (win!=null) {
				win.maximize();
				IJ.wait(100);
			}
		} else if (arg.equals("scale"))
			scaleToFit(imp);
	}
	
	void zoomToSelection(ImagePlus imp, ImageCanvas ic) {
		Roi roi = imp.getRoi();
		ic.unzoom();
		if (roi==null) return;
		Rectangle w = imp.getWindow().getBounds();
		Rectangle r = roi.getBounds();
		double mag = ic.getMagnification();
		int marginw = (int)((w.width - mag * imp.getWidth()));
		int marginh = (int)((w.height - mag * imp.getHeight()));
		int x = r.x+r.width/2;
		int y = r.y+r.height/2;
		mag = ic.getHigherZoomLevel(mag);
		while(r.width*mag