Java Code Examples for org.osmdroid.views.Projection#getWidth()

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Example 1
Source File: PolyOverlayWithIW.java    From osmdroid with Apache License 2.0 5 votes vote down vote up 
/**
 * @since 6.2.0
    * We pre-check if it's worth computing and drawing a poly.
    * How do we do that? As an approximation, we consider both the poly and the screen as disks.
    * Then, we compute the distance between both centers: if it's greater than the sum of the radii
    * the poly won't be visible.
 */
private boolean isVisible(final Projection pProjection) {
       // projecting the center and a corner of the bounding box to the screen, close to the screen center
	final BoundingBox boundingBox = getBounds();
       pProjection.toProjectedPixels(boundingBox.getCenterLatitude(), boundingBox.getCenterLongitude(),
               mVisibilityProjectedCenter);
       pProjection.toProjectedPixels(boundingBox.getLatNorth(), boundingBox.getLonEast(),
               mVisibilityProjectedCorner);
       pProjection.getLongPixelsFromProjected(mVisibilityProjectedCenter,
               pProjection.getProjectedPowerDifference(), true, mVisibilityRectangleCenter);
       pProjection.getLongPixelsFromProjected(mVisibilityProjectedCorner,
               pProjection.getProjectedPowerDifference(), true, mVisibilityRectangleCorner);

       // computing the distance and the radii
       final int screenCenterX = pProjection.getWidth() / 2;
       final int screenCenterY = pProjection.getHeight() / 2;
       final double radius = Math.sqrt(Distance.getSquaredDistanceToPoint(
               mVisibilityRectangleCenter.x, mVisibilityRectangleCenter.y,
               mVisibilityRectangleCorner.x, mVisibilityRectangleCorner.y));
       final double distanceBetweenCenters = Math.sqrt(Distance.getSquaredDistanceToPoint(
               mVisibilityRectangleCenter.x, mVisibilityRectangleCenter.y,
               screenCenterX, screenCenterY));
       final double screenRadius = Math.sqrt(Distance.getSquaredDistanceToPoint(
               0, 0,
               screenCenterX, screenCenterY));

       return distanceBetweenCenters <= radius + screenRadius;
}