FreehandRoi.java

package ij.gui;

import java.awt.*;
import java.awt.image.*;
import ij.*;

public class FreehandRoi extends PolygonRoi {


    public FreehandRoi(int x, int y, ImagePlus imp) {
        super(x, y, imp);
        if (Toolbar.getToolId()==Toolbar.FREEROI)
            type = FREEROI;
        else
            type = FREELINE;
    }

    protected void grow(int ox, int oy) {
        if (ox<0) ox = 0;
        if (oy<0) oy = 0;
        if (ox>xMax) ox = xMax;
        if (oy>yMax) oy = yMax;
        if  (ox!=xp[nPoints-1] || oy!=yp[nPoints-1]) {
            xp[nPoints] = ox-x;
            yp[nPoints] = oy-y;
            nPoints++;
            if (nPoints==xp.length)
                enlargeArrays();
            drawLine();
        }
    }
    
    void drawLine() {
        int x1 = xp[nPoints-2]+x;
        int y1 = yp[nPoints-2]+y;
        int x2 = xp[nPoints-1]+x;
        int y2 = yp[nPoints-1]+y;
        int xmin = Math.min(x1, x2);
        int xmax = Math.max(x1, x2);
        int ymin = Math.min(y1, y2);
        int ymax = Math.max(y1, y2);
        int margin = 4;
        if (ic!=null) {
            double mag = ic.getMagnification();
            if (mag<1.0) margin = (int)(margin/mag);
        }
        imp.draw(xmin-margin, ymin-margin, (xmax-xmin)+margin*2, (ymax-ymin)+margin*2);
    }

    protected void handleMouseUp(int screenX, int screenY) {
        if (state==CONSTRUCTING) {
            addOffset();
            finishPolygon();
        }
        state = NORMAL;
    }

}