com.qozix.tileview.tiles.selector.TileSetSelectorByRange Maven / Gradle / Ivy

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The TileView widget is a subclass of ViewGroup that provides a mechanism to asynchronously display tile-based images, with additional functionality for 2D dragging, flinging, pinch or double-tap to zoom, adding overlaying Views (markers), built-in Hot Spot support, dynamic path drawing, multiple levels of detail, and support for any relative positioning or coordinate system.

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package com.qozix.tileview.tiles.selector;

import java.util.ArrayList;
import java.util.List;

import com.qozix.tileview.detail.DetailLevel;
import com.qozix.tileview.detail.DetailLevelSet;

public class TileSetSelectorByRange implements TileSetSelector {

	private List switchPoint = new ArrayList();

	@Override
	public DetailLevel find( double scale, DetailLevelSet levels ) {
		int totalLevels = levels.size();
		int totalSwitches = switchPoint.size();

		// fast-fail
		if ( totalLevels == 0 ) {
			return null;
		}

		// sanity check the switchPoints with the levels
		// switchPoints should be 1 less then the total levels
		if ( totalLevels != ( totalSwitches + 1 ) ) {
			return null;
		}

		// loop through and find a set where this scale fits
		for ( int index = 0; index < totalSwitches; index++ ) {
			double thisSwitchPoint = this.switchPoint.get( index );

			// when we exceed the scale we take the previous
			if ( scale < thisSwitchPoint ) {
				return levels.get( index );
			}
		}

		// take the last
		return levels.get( totalLevels - 1 );
	}

	public void add( final double value ) {
		switchPoint.add( value );
	}
}