editableompoly.java

openmap java写的开源数字地图程序. 用applet实现,可以像google map 那样放大缩小地图.

        // returned, instead of the duplicate ending point.
        int lastPointIndex = polyGrabPoints.size() - 1;

        if (gb != null && gb == (GrabPoint) polyGrabPoints.get(lastPointIndex)
                && isEnclosed()) {

            gb = (GrabPoint) polyGrabPoints.get(0);
            setMovingPoint(gb);
        }
        return gb;
    }

    /**
     * Check to make sure the grab points are not null. If they are,
     * allocate them, and them assign them to the array.
     */
    public void assertGrabPoints() {

        // This gets called alot. Usually, for EditableOMGraphics
        // that have the same number of GrabPoints, they can just be
        // allocated here. I think we'll have to look at the OMPoly,
        // find out how many points have been defined for it (since
        // it's variable), and make sure everything's OK.

        if (polyGrabPoints == null) {
            polyGrabPoints = new ArrayList();
        }

        // At least we know about this one.
        if (gpo == null) {
            gpo = new OffsetGrabPoint(-1, -1);
        }
    }

    /**
     * An internal method that trys to make sure that the grab point
     * for the first node, and for the last, in case of an enclosed
     * polygon, are OffsetGrabPoints. All of the other points will be
     * regular GrabPoints. Usually called when assigning points to a
     * previously defined poly.
     * 
     * @param x the horizontal pixel location of the grab point.
     * @param y the vertical pixel location of the grab point.
     * @param index the index of the grab point.
     * @param last the index of the last point.
     */
    protected GrabPoint createGrabPoint(int x, int y, int index, int last) {
        if (index == 0 || (index == last && (isEnclosed()))) {
            return new OffsetGrabPoint(x, y);
        } else {
            return new GrabPoint(x, y);
        }
    }

    /**
     * Set the grab points for the graphic provided, setting them on
     * the extents of the graphic. Called when you want to set the
     * grab points off the points of the graphic.
     */
    public void setGrabPoints(OMGraphic graphic) {
        if (!(graphic instanceof OMPoly)) {
            return;
        }

        assertGrabPoints();
        polyGrabPoints.clear();
        gpo.clear();

        OMPoly poly = (OMPoly) graphic;
        boolean ntr = poly.getNeedToRegenerate();
        int renderType = poly.getRenderType();
        Point p = new Point();
        GrabPoint gb;
        int i;
        int npts;

        if (ntr == false) {
            if (renderType == OMGraphic.RENDERTYPE_LATLON) {
                Debug.message("eomg", "EditableOMPoly: modifying lat/lon line");

                if (projection != null) {

                    float[] ll = poly.getLatLonArray();

                    gb = null; //reset for this loop

                    for (i = 0; i < ll.length; i += 2) {
                        projection.forward(ll[i], ll[i + 1], p, true);
                        // Need to add a grab point for this
                        // coordinate
                        gb = new OffsetGrabPoint((int) p.getX(), (int) p.getY());
                        polyGrabPoints.add(gb);
                    }
                }

            } else if (renderType == OMGraphic.RENDERTYPE_OFFSET) {
                // Grab the projected endpoints
                Debug.message("eomg", "EditableOMPoly: modifying offset poly");

                int x;
                int y;
                npts = poly.xs.length;

                // Check to see if the poly is a offset poly, and set
                // the
                // offset grab point accordingly.
                if (projection != null) {
                    projection.forward(poly.lat, poly.lon, p, true);
                    gpo.set((int) p.getX(), (int) p.getY());

                    if (poly.coordMode == OMPoly.COORDMODE_ORIGIN) {
                        for (i = 0; i < npts; i++) {
                            x = poly.xs[i] + p.x;
                            y = poly.ys[i] + p.y;
                            gb = new OffsetGrabPoint(x, y);
                            polyGrabPoints.add(gb);
                        }
                    } else { // CMode Previous offset deltas
                        int lastX = p.x;
                        int lastY = p.y;

                        for (i = 0; i < npts; i++) {
                            x = poly.xs[i] + lastX;
                            y = poly.ys[i] + lastY;

                            gb = new OffsetGrabPoint(x, y);
                            polyGrabPoints.add(gb);

                            lastX += x;
                            lastY += y;
                        }
                    }
                }

            } else {
                npts = poly.xs.length;

                Debug.message("eomg", "EditableOMPoly: modifying x/y poly");
                for (i = 0; i < npts; i++) {
                    gb = new OffsetGrabPoint(poly.xs[i], poly.ys[i]);
                    polyGrabPoints.add(gb);
                }
            }

            // Add the || to maintain manualEnclosed if it was
            // externally set before the OMPoly is actually defined,
            // indicating that the user wants to draw a polygon.
            setEnclosed(syncEnclosed() || isEnclosed());
            addPolyGrabPointsToOGP(gpo);

        } else {
            Debug.message("eomg",
                    "EditableOMPoly.setGrabPoints: graphic needs to be regenerated ");
        }
    }

    /**
     * Take the current location of the GrabPoints, and modify the
     * location parameters of the OMPoly with them. Called when you
     * want the graphic to change according to the grab points.
     */
    public void setGrabPoints() {
        int i;
        GrabPoint gb; // just to use a temp marker
        LatLonPoint llp = new LatLonPoint();
        int renderType = poly.getRenderType();
        if (renderType == OMGraphic.RENDERTYPE_LATLON) {
            if (projection != null) {
                float[] floats = new float[polyGrabPoints.size() * 2];
                for (i = 0; i < polyGrabPoints.size(); i++) {
                    gb = (GrabPoint) polyGrabPoints.get(i);
                    projection.inverse(gb.getX(), gb.getY(), llp);

                    floats[2 * i] = llp.radlat_;
                    floats[2 * i + 1] = llp.radlon_;
                }

                poly.setLocation((float[]) floats, OMGraphic.RADIANS);
            } else {
                Debug.message("eomg",
                        "EditableOMPoly.setGrabPoints: projection is null, can't figure out LATLON points for poly.");
            }
        } else if (renderType == OMGraphic.RENDERTYPE_OFFSET) {
            // Do the offset point.
            if (projection != null) {

                projection.inverse(gpo.getX(), gpo.getY(), llp);

            } else {
                Debug.message("eomg",
                        "EditableOMPoly.setGrabPoints: projection is null, can't figure out LATLON points for poly offset.");
            }
        }

        if (renderType == OMGraphic.RENDERTYPE_XY
                || renderType == OMGraphic.RENDERTYPE_OFFSET) {

            int[] ints = new int[polyGrabPoints.size() * 2];
            if (renderType == OMGraphic.RENDERTYPE_OFFSET && gpo != null) {
                // If offset rendertype, the x-y have to be offset
                // distances, not screen pixel locations. For the
                // polygon, you also need to take into account that
                // the ints can represent 2 different things: distance
                // from the origin (Offset) or distance from the
                // previous point. Need to check with the poly to
                // find out which to do.
                GrabPoint previous = gpo;

                for (i = 0; i < polyGrabPoints.size(); i++) {
                    gb = (GrabPoint) polyGrabPoints.get(i);

                    if (poly.coordMode == OMPoly.COORDMODE_PREVIOUS) {

                        ints[2 * i] = gb.getX() - previous.getX();
                        ints[2 * i + 1] = gb.getY() - previous.getY();

                        previous = gb;

                    } else {
                        ints[2 * i] = gb.getX() - gpo.getX();
                        ints[2 * i + 1] = gb.getY() - gpo.getY();
                    }
                }

                poly.setLocation(llp.radlat_,
                        llp.radlon_,
                        OMGraphic.RADIANS,
                        ints);

            } else {

                for (i = 0; i < polyGrabPoints.size(); i++) {
                    gb = (GrabPoint) polyGrabPoints.get(i);

                    ints[2 * i] = gb.getX();
                    ints[2 * i + 1] = gb.getY();
                }

                poly.setLocation(ints);
            }
        }

    }

    /**
     * Add a point to the end of the polyline/polygon and then make it
     * the moving one.
     * 
     * @return the index for the point in the polygon, starting with
     *         0.
     */
    public int addMovingPoint(int x, int y) {
        int position = addPoint(x, y);
        setMovingPoint((GrabPoint) polyGrabPoints.get(position));
        return position;
    }

    /**
     * Add a point to the end of the polyline/polygon.
     * 
     * @return the index for the point in the polygon, starting with
     *         0.
     */
    public int addPoint(int x, int y) {
        return addPoint(x, y, Integer.MAX_VALUE);
    }

    /**
     * Add a point at a certain point in the polygon coordinate list.
     * If the position is less than zero, the point will be the
     * starting point. If the position is greater than the list of
     * current points, the point will be added to the end of the poly.
     * 
     * @return the index for the point in the polygon, starting with
     *         0.
     */
    public int addPoint(int x, int y, int position) {
        return addPoint(new OffsetGrabPoint(x, y), position);
    }

    /**
     * Add a point at a certain point in the polygon coordinate list.
     * If the position is less than zero, the point will be the
     * starting point. If the position is greater than the list of
     * current points, the point will be added to the end of the poly.
     * This method is convenient because it lets you define the
     * GrabPoint object to use for the node, in case you need a
     * special type of GrabPoint.
     * 
     * @param gp the GrabPoint set to the screen coordinates of the
     *        point to be added.
     * @return the index for the point in the polygon, starting with
     *         0.
     */
    public int addPoint(GrabPoint gp) {
        return addPoint(gp, Integer.MAX_VALUE);
    }

    /**
     * Add a point at a certain point in the polygon coordinate list.
     * If the position is less than zero, the point will be the
     * starting point. If the position is greater than the list of
     * current points, the point will be added to the end of the poly.
     * This method is convenient because it lets you define the
     * GrabPoint object to use for the node, in case you need a
     * special type of GrabPoint.
     * 
     * @return the index for the point in the polygon, starting with
     *         0.
     */
    public int addPoint(GrabPoint gp, int position) {

        if (gp == null) {
            return -1;
        }

        int x = gp.getX();
        int y = gp.getY();

        int renderType = poly.getRenderType();

        if (renderType == OMGraphic.RENDERTYPE_LATLON) {
            Debug.message("eomg",
                    "EditableOMPoly: adding point to lat/lon poly");

            if (projection != null) {

                float[] ll = poly.getLatLonArray();
                int actualPosition = (position == Integer.MAX_VALUE ? ll.length
                        : position * 2);

                LatLonPoint llpnt = projection.inverse(x, y);

                if (Debug.debugging("eomp")) {
                    Debug.output("EditableOMPoly: adding point to lat/lon poly at "
                            + x + ", " + y + ": " + llpnt + ", at the end of ");

                    for (int j = 0; j < ll.length; j += 2) {
                        Debug.output(ll[j] + ", " + ll[j + 1]);
                    }
                }

                float[] newll = new float[ll.length + 2];

                if (actualPosition >= ll.length) {
                    // Put the new points at the end