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

/** This plugin implements the File/Import/XY Coordinates command. It reads a
    two column text file, such as those created by File/Save As/XY Coordinates,
    as a polygon ROI. The ROI is displayed in the current image or, if the image
    is too small, in a new blank image.
*/
public class XY_Reader implements PlugIn {

    public void run(String arg) {
        TextReader tr = new TextReader();
        ImageProcessor ip = tr.open();
        if (ip==null)
            return;
        int width = ip.getWidth();
        int height = ip.getHeight();
        if (width!=2 || height<3) {
            IJ.showMessage("XY Reader", "Two column text file required");
            return;
        }
        float[] x = new float[height];
        float[] y = new float[height];
        boolean allIntegers = true;
        double length = 0.0;
        for (int i=0; i<height; i++) {
            x[i] = ip.getf(0, i);
            y[i] = ip.getf(1, i);
            if ((int)x[i]!=x[i] || (int)y[i]!=y[i])
                allIntegers = false;
            if (i>0) {
                double dx = x[i] - x[i-1];
                double dy = y[i] - y[i-1];
                length += Math.sqrt(dx*dx+dy*dy);
            }
        }
        Roi roi = null;
        int type = length/x.length>10?Roi.POLYGON:Roi.FREEROI;
        if (allIntegers)
            roi = new PolygonRoi(Roi.toIntR(x), Roi.toIntR(y), height, type);
        else
            roi = new PolygonRoi(x, y, height, type);
        Rectangle r = roi.getBoundingRect();
        ImagePlus imp = WindowManager.getCurrentImage();
        if (imp==null || imp.getWidth()<r.x+r.width || imp.getHeight()<r.y+r.height) {
            new ImagePlus(tr.getName(), new ByteProcessor(Math.abs(r.x)+r.width+10, Math.abs(r.y)+r.height+10)).show();
            imp = WindowManager.getCurrentImage();
        }
        if (imp!=null)
            imp.setRoi(roi);
    }
    
}