[英]Unable to display a map marker with a shadow
我正在使用自定義的Overlay
類在MapView
小部件上顯示標記。 我正在使用與發現的另一個示例相同的圖像,但是我的疊加層缺少陰影。
這是原始的:
..這是我的:
陰影是如何產生的? 這是另一個可繪制資源還是Overlay
類的draw
方法中的一些技巧。 謝謝。
-
這是我的Overlay
課程:
public class Mappin extends com.google.android.maps.Overlay {
private final GeoPoint geoPoint;
private final Context ctxContext;
public Mappin(Context ctxContext, GeoPoint geoPoint) {
super();
this.geoPoint = geoPoint;
this.ctxContext = ctxContext;
}
public boolean draw(Canvas canCanvas, MapView mvwMap, boolean booShadow, long lngWhen) {
super.draw(canCanvas, mvwMap, booShadow);
Point screenPts = new Point();
mvwMap.getProjection().toPixels(this.geoPoint, screenPts);
Bitmap bmp = BitmapFactory.decodeResource(this.ctxContext.getResources(), R.drawable.ic_location_marker);
canCanvas.drawBitmap(bmp, screenPts.x - bmp.getWidth() / 2, screenPts.y - bmp.getHeight(), null);
return true;
}
}
我找到了一些顯示標記陰影的代碼。 我需要調整偏斜因素才能使其正常工作,但目前為止確實可行。 這是我的自定義Overlay
的完整代碼:
public class Mappin extends Overlay {
protected Drawable drwMarker;
protected GeoPoint gptCoordinates;
public Mappin(Drawable drwMarker, GeoPoint gptCoordinates) {
this.drwMarker = drwMarker;
this.gptCoordinates = gptCoordinates;
}
@Override
public void draw(Canvas canCanvas, MapView mapView, boolean booShadow) {
super.draw(canCanvas, mapView, booShadow);
Projection prjProjection = mapView.getProjection();
Integer x;
Integer y;
if (!booShadow) {
x = prjProjection.toPixels(gptCoordinates, null).x - (drwMarker.getIntrinsicWidth() / 2);
y = prjProjection.toPixels(gptCoordinates, null).y - (drwMarker.getIntrinsicHeight());
} else {
Integer intSign = (SHADOW_X_SKEW > 0 ? 1 : -1);
Float fltScaler = 1.1F - Math.abs(SHADOW_X_SKEW);
x = (int) (prjProjection.toPixels(gptCoordinates, null).x - (intSign * (drwMarker.getIntrinsicWidth() * fltScaler)));
y = (int) (prjProjection.toPixels(gptCoordinates, null).y - (drwMarker.getIntrinsicHeight() * SHADOW_Y_SCALE));
}
drawAt(canCanvas, drwMarker, x, y, booShadow);
}
}
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