我的地图视图和叠加有问题。
每次改变 GPS 位置时，我都必须在地图上画一个圆圈。
我在覆盖类中使用了扩展覆盖的方法绘制。
问题是我必须以透明度绘制这些圆圈，但是当圆圈在交点处相互重叠时，颜色会有所不同，因为存在 alpha 之和。
我该如何修复它？
这是我的覆盖类：
public class ImpactOverlay extends Overlay {
private static int CIRCLERADIUS = 0;
private GeoPoint geopoint;
private int myCircleRadius;
Point point = new Point();
Paint circle = new Paint(Paint.ANTI_ALIAS_FLAG);
private long systemTime= -1 ;
public ImpactOverlay(GeoPoint point, int myRadius) {
geopoint = point;
CIRCLERADIUS = myRadius; // assegna raggio del cerchio
}
@Override
public void draw(Canvas canvas, MapView mapView, boolean shadow) {
// Transfrom geoposition to Point on canvas
Projection projection = mapView.getProjection();
projection.toPixels(geopoint, point);
// the circle to mark the spot
circle.setColor(Color.parseColor("#88ff0000"));
circle.setAlpha(122); // trasparenza
myCircleRadius = metersToRadius(CIRCLERADIUS, mapView,
(double) geopoint.getLatitudeE6() / 1000000);
canvas.drawCircle(point.x, point.y, myCircleRadius, circle);
}
public static int metersToRadius(float meters, MapView map, double latitude) {
return (int) (map.getProjection().metersToEquatorPixels(meters) * (1 / Math
.cos(Math.toRadians(latitude))));
}
@Override
/* Implementa il doppio tap per eseguire zoom sulla mappa */
public boolean onTouchEvent(MotionEvent event, MapView mapView) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if ((System.currentTimeMillis() - systemTime) < 250) {
mapView.getController().zoomIn();
}
systemTime = System.currentTimeMillis();
break;
}
return false;
}
}
CircleOptions circle = new CircleOptions();
circle.center(new LatLng(latitude, longitude))
.radius(1500)//in meters
.strokeColor(Color.BLUE)//border color
.strokeWidth(3.0f)//border width
.fillColor(0x200000ff);//inside circle
googleMap.addCircle(circle);//GoogleMap googleMap(initialize accordingly)
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