Custom location markers MapField will not Center

Hi all

I am facing a problem where the location for my custom MapField (OS 5.0) markers are not perfectly centered on the map. Instead, they always appear in the same place, which is a little lower and more to the right of the Center.

I use the method object of my MapField custom to draw markers. Can we see what might be the culprit? Thank you!

protected void paint(Graphics graphics) {
    super.paint(graphics);

    if (vector != null) {
        for (int i = 0; i < vector.size(); i++) {

            LocationsObject loc = (LocationsObject) vector.elementAt(i);

            Coordinates coords = getCoordinates();
            coords.setLatitude(Double.parseDouble(loc.getStrLocationLatitude()));
            coords.setLongitude(Double.parseDouble(loc.getStrLocationLongitude());

            XYPoint point = new XYPoint();
            convertWorldToField(coords, point);

            Bitmap bitmap = Bitmap.getBitmapResource("location_marker.png");

            graphics.drawBitmap(point.x, point.y, bitmap.getWidth(),bitmap.getHeight(), bitmap, 0, 0);

        }
    }
}

I think I know what is happening here. Will do my best to explain.

Assume that your brand image is of size 10 x 10. And the size of your device screen 480 x 360. Now, you want to put the marker in the center of the screen that will be (240 180) in our case. Now, when you call the drawbitmap, you will be probably development of marker (0,0) to (240 160) screen image. Method of painting will start shooting your bitmap of this point.

To center the image of marker perfectly on (240 160), it must be placed on (235 155). Here I subtracted (marker.width/2, marker.height/2) from the center point. In our example, the marker is 10 x 10. So you get (240 160) - (5.5) = (235, 155)

In the code you prob you have to do something like that.

int markerX = point.x - bitmap.getWidth () / 2;
int markerY = point.y - bitmap.getHeight () / 2;
graphics.drawBitmap (markerX, markerY, bitmap.getWidth (), bitmap.getHeight (), bitmap, 0, 0);

I hope that this is the only problem.

Tags: BlackBerry Developers

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