private void drawRuler(Canvas canvas) {
// update cache
if (view.isZooming()) {
cacheRulerText = null;
} else if (view.getFloatZoom() != cacheRulerZoom
|| Math.abs(view.getXTile() - cacheRulerTileX) + Math.abs(view.getYTile() - cacheRulerTileY)
> 1) {
cacheRulerZoom = view.getFloatZoom();
cacheRulerTileX = view.getXTile();
cacheRulerTileY = view.getYTile();
double latitude = view.getLatitude();
double leftLon = view.calcLongitude(-view.getWidth() / 2);
double rightLon = view.calcLongitude(+view.getWidth() / 2);
double dist = MapUtils.getDistance(latitude, leftLon, latitude, rightLon);
double pixDensity = view.getWidth() / dist;
double roundedDist =
OsmAndFormatter.calculateRoundedDist(dist * screenRulerPercent, view.getContext());
int cacheRulerDistPix = (int) (pixDensity * roundedDist);
cacheRulerText =
ShadowText.create(
OsmAndFormatter.getFormattedDistance((float) roundedDist, view.getContext()));
cacheRulerTextLen = zoomTextPaint.measureText(cacheRulerText.getText());
Rect bounds = rulerDrawable.getBounds();
bounds.right = (int) (view.getWidth() - 7 * scaleCoefficient);
bounds.bottom =
(int)
(view.getHeight()
- view.getResources().getDrawable(R.drawable.map_zoom_in).getMinimumHeight());
bounds.top = bounds.bottom - rulerDrawable.getMinimumHeight();
bounds.left = bounds.right - cacheRulerDistPix;
rulerDrawable.setBounds(bounds);
}
if (cacheRulerText != null) {
rulerDrawable.draw(canvas);
Rect bounds = rulerDrawable.getBounds();
cacheRulerText.draw(
canvas,
bounds.left + (bounds.width() - cacheRulerTextLen) / 2,
bounds.bottom - 8 * scaleCoefficient,
rulerTextPaint,
shadowColor);
}
}
