Examples of com.bbn.openmap.omGraphics.OMBitmap

com.bbn.openmap.omGraphics.OMBitmap

The OMBitmap lets you create a two color image. The display color is the foreground color, and the fill color is the background color. OMColors can be used, and their transparency values will be implemented.

The array of bytes is used to create the picture. Each bit, representing a pixel, is examined, and the color is set to the display or fill color, depending on the bit value. There isn't a height and width restriction on OMBitmaps, but you do have to be careful about the byte array that is used for one. The OMBitmap is based on an X bitmap, not a Windows bmp file. Again, each bit of the bytes corresponds to a pixel. If the height and/or width of the bitmap isn't a multiple of 8, you have to round up the number of bytes used so that the excess bits are covered in that extra byte for the row.

So, for a 4x4 bitmap, you need:

 ooooxxxx|ooooxxxx|ooooxxxx|ooooxxxx -> 1 by 4 bytes, 4 bytes total

where x's are the bits being used for the bitmap ( and whether they are 1 or 0 dictates either foreground or background color), and o's are the leftover bits (they are ignored). The '|' are byte boundaries.

The bits, per byte, look like they are used in reverse order because they are - least significant bit, per byte, is used in that order.

For a 6x6 bitmap:

 ooxxxxxx|ooxxxxxx|ooxxxxxx|ooxxxxxx|ooxxxxxx|ooxxxxxx -> 1 x 6 bytes, 6 bytes total

for a 10x10 bitmap:

 xxxxxxxx|ooooooxx|xxxxxxxx|ooooooxx|xxxxxxxx|ooooooxx|xxxxxxxx|ooooooxx|xxxxxxxx|ooooooxx|xxxxxxxx|ooooooxx|xxxxxxxx|ooooooxx|xxxxxxxx|ooooooxx|xxxxxxxx|ooooooxx|xxxxxxxx|ooooooxx -> 2 by 10 bytes, 20 bytes total

There is the ability to add a filter to the OMBitmap, to change it's appearance for rendering. The most common filter, which is included as a kind of default, is the scale filter. Filtering the OMRasterObject replaces the bitmap variable, which is the internal java.awt.Image used for rendering.

     */
    public static OMBitmap read(DataInputStream dis,
                                LinkProperties propertiesBuffer)
            throws IOException {


        OMBitmap bitmap = null;
        float lat = 0;
        float lon = 0;
        int x = 0;
        int y = 0;
        int w = 0;
        int h = 0;
        int length;


        int renderType = dis.readByte();


        switch (renderType) {
        case RENDERTYPE_OFFSET:
            lat = dis.readFloat();
            lon = dis.readFloat();
            // Fall through...
        case RENDERTYPE_XY:
            x = dis.readInt();
            y = dis.readInt();
            break;
        case RENDERTYPE_LATLON:
        default:
            lat = dis.readFloat();
            lon = dis.readFloat();
        }


        w = dis.readInt();
        h = dis.readInt();
        length = dis.readInt();


        byte[] bytes = new byte[length];
        dis.readFully(bytes);


        switch (renderType) {
        case RENDERTYPE_OFFSET:
            bitmap = new OMBitmap(lat, lon, x, y, w, h, bytes);
            break;
        case RENDERTYPE_XY:
            bitmap = new OMBitmap(x, y, w, h, bytes);
            break;
        case RENDERTYPE_LATLON:
        default:
            bitmap = new OMBitmap(lat, lon, w, h, bytes);
        }


        if (bitmap != null) {
            LinkProperties properties = LinkProperties.loadPropertiesIntoOMGraphic(dis, bitmap, propertiesBuffer);
            bitmap.setRotationAngle((double) ProjMath.degToRad(PropUtils.floatFromProperties(properties,
                    LPC_LINKROTATION,
                    0.0f)));
        }


        return bitmap;


        for (int i = 0; i < bytearr.length; i++) {
            bytearr[i] = (byte) 0xffffffff;
        }


        OMBitmap omb = new OMBitmap(45.3583f, -71.06f, 16, 16, bytearr);
        omb.setLinePaint(Color.red);
        omb.setFillPaint(null);
        omb.setSelectPaint(Color.blue);
        omb.setRotationAngle(Math.PI / 2);
        omList.add(omb);


        OMPoint point = new OMPoint(42f, -72f, 14);
        point.setFillPaint(Color.green);
        point.setOval(true);

Examples of com.bbn.openmap.omGraphics.OMBitmap

Related Classes of com.bbn.openmap.omGraphics.OMBitmap