package ij.gui;

import java.awt.*;
import java.awt.image.*;
import ij.*;
import ij.process.*;
import ij.measure.*;
import ij.plugin.filter.Analyzer;
import java.awt.event.KeyEvent;

/** This class represents a collection of points. */
public class PointRoi extends PolygonRoi {

    static Font font;
    
    /** Creates a new PointRoi using the specified arrays of offscreen coordinates. */
    public PointRoi(int[] ox, int[] oy, int points) {
        super(ox, oy, points, POINT);
        width+=1; height+=1;
    }

    /** Creates a new PointRoi using the specified offscreen coordinates. */
    public PointRoi(int ox, int oy) {
        super(makeXArray(ox, null), makeYArray(oy, null), 1, POINT);
        width=1; height=1;
    }

    /** Creates a new PointRoi using the specified screen coordinates. */
    public PointRoi(int sx, int sy, ImagePlus imp) {
        super(makeXArray(sx, imp), makeYArray(sy, imp), 1, POINT);
        setImage(imp);
        width=1; height=1;
        if (imp!=null) imp.draw(x-5, y-5, width+10, height+10);
    }

    static int[] makeXArray(int value, ImagePlus imp) {
        int[] array = new int[1];
        array[0] = imp!=null?imp.getCanvas().offScreenX(value):value;
        return array;
    }
                
    static int[] makeYArray(int value, ImagePlus imp) {
        int[] array = new int[1];
        array[0] = imp!=null?imp.getCanvas().offScreenY(value):value;
        return array;
    }
                
    void handleMouseMove(int ox, int oy) {
        //IJ.log("handleMouseMove");
    }
    
    protected void handleMouseUp(int sx, int sy) {
        super.handleMouseUp(sx, sy);
        modifyRoi(); //adds this point to previous points if shift key down
    }
    
    /** Draws the points on the image. */
    public void draw(Graphics g) {
        //IJ.log("draw: " + nPoints+"  "+width+"  "+height);
        updatePolygon();
        if (ic!=null) mag = ic.getMagnification();
        int size2 = HANDLE_SIZE/2;
        if (!Prefs.noPointLabels) {
            if (font==null) font = new Font("SansSerif", Font.PLAIN, 9);
            g.setFont(font);
        }
        for (int i=0; i<nPoints; i++)
            drawPoint(g, xp2[i]-size2, yp2[i]-size2, i+1);
        //showStatus();
        if (updateFullWindow)
            {updateFullWindow = false; imp.draw();}
    }

    void drawPoint(Graphics g, int x, int y, int n) {
        g.setColor(Color.white);
        g.drawLine(x-4, y+2, x+8, y+2);
        g.drawLine(x+2, y-4, x+2, y+8);
        g.setColor(instanceColor!=null?instanceColor:ROIColor);
        g.fillRect(x+1,y+1,3,3);
        if (!Prefs.noPointLabels && nPoints>1)
            g.drawString(""+n, x+6, y+13); 
        g.setColor(Color.black);
        g.drawRect(x, y, 4, 4);
    }

    public void drawPixels(ImageProcessor ip) {
        ip.setLineWidth(Analyzer.markWidth);
        for (int i=0; i<nPoints; i++) {
            ip.moveTo(x+xp[i], y+yp[i]);
            ip.lineTo(x+xp[i], y+yp[i]);
        }
    }
    
    /** Adds a point to this selection and return the result. */
    public PointRoi addPoint(int x, int y) {
        Polygon poly = getPolygon();
        poly.addPoint(x, y);
        PointRoi p = new PointRoi(poly.xpoints, poly.ypoints, poly.npoints);
        //IJ.log("addPoint: "+((PointRoi)p).getNCoordinates());
        return p;
    }

    /** Subtract the points that intersect the specified ROI and return 
        the result. Returns null if there are no resulting points. */
    public PointRoi subtractPoints(Roi roi) {
        Polygon points = getPolygon();
        Polygon poly = roi.getPolygon();
        Polygon points2 = new Polygon();
        for (int i=0; i<points.npoints; i++) {
            if (!poly.contains(points.xpoints[i], points.ypoints[i]))
                points2.addPoint(points.xpoints[i], points.ypoints[i]);
        }
        if (points2.npoints==0)
            return null;
        else
            return new PointRoi(points2.xpoints, points2.ypoints, points2.npoints);
    }

    public ImageProcessor getMask() {
        if (cachedMask!=null && cachedMask.getPixels()!=null)
            return cachedMask;
        ImageProcessor mask = new ByteProcessor(width, height);
        for (int i=0; i<nPoints; i++) {
            mask.putPixel(xp[i], yp[i], 255);
        }
        cachedMask = mask;
        return mask;
    }

    /** Returns true if (x,y) is one of the points in this collection. */
    public boolean contains(int x, int y) {
        for (int i=0; i<nPoints; i++) {
            if (x==this.x+xp[i] && y==this.y+yp[i]) return true;
        }
        return false;
    }

}