October 28th, 2011, 04:01 PM
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Join Date: Oct 2011
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Drawing lots of markers on a map
hi all,
I'm trying to draw on a map using markers. The problem I'm having is when I try to add lots of them, then I can't get it to run.
To illustrate my problem, let's say I want to draw a square made of 900 smaller squares (30x30).
I'm trying to add the markers to an itemizedoverlay, then drawing it.
the code is below. Any suggestion how I could do that?
Thank you very much!!
Code:
public class MyItemizedOverlay extends ItemizedOverlay{
private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
private Context mContext;
public MyItemizedOverlay(Drawable defaultMarker) {
super(boundCenterBottom(defaultMarker));
}
public MyItemizedOverlay(Drawable defaultMarker, Context context) {
super(defaultMarker);
mContext = context;
}
public void draw(android.graphics.Canvas canvas, MapView mapView,boolean shadow) {
super.draw(canvas, mapView, false);
}
public void addOverlay(OverlayItem overlay) {
mOverlays.add(overlay);
populate();
}
@Override
protected OverlayItem createItem(int i) {
return mOverlays.get(i);
}
}
Code:
public class MainActivity extends MapActivity {
MapView mapView;
MapController mc;
GeoPoint p;
static Context context;
int k=1;
List<Overlay> mapOverlays;
MyItemizedOverlay itemizedoverlay;
int[] xx,yy;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
context = getApplicationContext();
mapView = (MapView) findViewById(R.id.mapView);
mapView.setBuiltInZoomControls(true);
mc = mapView.getController();
String coordinates[] = {"36.186382", "-112.221909"};
double lat = Double.parseDouble(coordinates[0]);
double lng = Double.parseDouble(coordinates[1]);
p = new GeoPoint(
(int) (lat * 1E6),
(int) (lng * 1E6));
mc.animateTo(p);
mc.setZoom(10);
mapOverlays = mapView.getOverlays();
Drawable squareM = this.getResources().getDrawable(R.drawable.square);
itemizedoverlay = new MyItemizedOverlay(squareM);
int n=0;
xx = new int[30];
yy = new int[30];
while(n<30){
xx[n]=n;
yy[n]=n;
n++;
}
}
protected void drawNewMarker(GeoPoint p){
OverlayItem overlayitem = new OverlayItem(p, "", "");
itemizedoverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedoverlay);
mapView.postInvalidate();
}
protected void drawNewMarkerD(){
Point pointP = new Point(0,0);
mapView.getProjection().toPixels(p, pointP);
int xoff = 20*k;
int yoff = 20*k;
GeoPoint pp = mapView.getProjection().fromPixels(pointP.x + xoff, pointP.y + yoff);
OverlayItem overlayitem = new OverlayItem(pp, "", "");
Drawable iconM = this.getResources().getDrawable(R.drawable.icon);
iconM.setBounds(0,0, 50, 50);
overlayitem.setMarker(iconM);
itemizedoverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedoverlay);
k++;
//mapView.postInvalidate();
}
@Override
protected boolean isRouteDisplayed() {
return false;
}
protected void drawGrid(int xoff, int yoff){
GeoPoint p = newGeoPointFromOffset(xoff, yoff);
OverlayItem overlayitem = new OverlayItem(p, "", "");
Drawable marker = this.getResources().getDrawable(R.drawable.grid);
marker.setBounds(0,0, 15, 15);
overlayitem.setMarker(marker);
itemizedoverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedoverlay);
}
protected GeoPoint newGeoPointFromOffset(int xoff, int yoff){
Point screenPointP = new Point(0,0);
mapView.getProjection().toPixels(p, screenPointP);
int x = 15*xoff;
int y = 15*yoff;
return mapView.getProjection().fromPixels(screenPointP.x + x, screenPointP.y + y);
}
public boolean onKeyDown(int keyCode, KeyEvent event){
MapController mc = mapView.getController();
switch(keyCode){
case KeyEvent.KEYCODE_3:
mc.zoomIn();
break;
case KeyEvent.KEYCODE_1:
mc.zoomOut();
break;
case KeyEvent.KEYCODE_0:
drawNewMarker(p);
break;
case KeyEvent.KEYCODE_9:
for(int r=0;r<30;r++){
for(int s=0;s<30;s++){
drawGrid(r,s);
}
}
mapView.postInvalidate();
break;
}
return super.onKeyDown(keyCode, event);
}
}
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