Overlay only draws line between first 2 GPS points in Android
- by LordSnoutimus
Hi,
I am experiencing an unusual error using ItemizedOverlay in Android.
I am creating a GPS tracking device that plots a route between waypoints stored in a database.
When I provide the first two sets of longitude and latitude points through the emulator in Eclipse, it draws a red line just how I want it, but if I send another GPS point, it animates to the point, but does not draw a line from the last point.
public class MyOverlay extends ItemizedOverlay
{
// private Projection projection;
private Paint linePaint;
private Vector points;
public MyOverlay(Drawable defaultMarker) {
super(defaultMarker);
points = new Vector<GeoPoint>();
//set colour, stroke width etc.
linePaint = new Paint();
linePaint.setARGB(255, 255, 0, 0);
linePaint.setStrokeWidth(3);
linePaint.setDither(true);
linePaint.setStyle(Style.FILL);
linePaint.setAntiAlias(true);
linePaint.setStrokeJoin(Paint.Join.ROUND);
linePaint.setStrokeCap(Paint.Cap.ROUND);
}
public void addPoint(GeoPoint point) {
points.addElement(point);
}
public void draw(Canvas canvas, MapView view, boolean shadow) {
int size = points.size();
Point lastPoint = new Point();
if(size == 0) return;
view.getProjection().toPixels(points.get(0), lastPoint);
Point point = new Point();
for(int i = 1; i<size; i++){
view.getProjection().toPixels(points.get(i), point);
canvas.drawLine(lastPoint.x, lastPoint.y, point.x, point.y, linePaint);
lastPoint = point;
}
}
@Override
protected OverlayItem createItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public int size() {
// TODO Auto-generated method stub
return 0;
}
}
