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package tim.prune.save;
import tim.prune.data.Track;
import tim.prune.data.TrackExtents;
/**
* Extract image size logic into single place
*/
public abstract class ImageSizeLimits
{
private static final int MIN_PIXELS_ALLOWED = 100;
private static final int MAX_PIXELS_ALLOWED = 8000;
/**
* @param inTrack track object
* @param inZoom selected zoom level
* @return true if the image size is acceptable
*/
public static boolean isZoomLevelOk(Track inTrack, int inZoom)
{
final int pixelCount = getPixelCount(inTrack, inZoom);
return pixelCount > MIN_PIXELS_ALLOWED
&& pixelCount < MAX_PIXELS_ALLOWED;
}
/** @return the pixel width / height of the resulting image including border */
private static int getPixelCount(Track inTrack, int inZoom)
{
// Get the extents of the track including a standard (10%) border around the data
TrackExtents extents = new TrackExtents(inTrack);
extents.applySquareBorder();
// Work out how big the final image will be
final int zoomFactor = 1 << inZoom;
return (int) (extents.getXRange().getRange() * zoomFactor * 256);
}
}
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