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/* The MIT License (MIT)
*
* Copyright (c) 2015 Reinventing Geospatial, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.rgi.common.tile.scheme;
import java.util.Collection;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
/**
* A {@link TileScheme} implementation of a common convention where a tile
* set's tile matrix doubles width and height between successive zoom levels.
*
* @author Luke Lambert
*
*/
public class ZoomTimesTwo implements TileScheme
{
public static final double BASE_TWO = 2.0;
/**
* Constructor
*
* @param minimumZoomLevel
* Lowest valid level of zoom for this tile scheme. Must be 0 or greater, and less than or equal to maximumZoomLevel.
* @param maximumZoomLevel
* Highest valid level of zoom for this tile scheme. Must be 0 or greater, and greater than or equal to minimumZoomLevel.
* @param baseZoomLevelTileMatrixWidth
* The number of tiles along the x axis for the lowest zoom level
* @param baseZoomLevelTileMatrixHeight
* The number of tiles along the y axis for the lowest zoom level
*/
public ZoomTimesTwo(final int minimumZoomLevel,
final int maximumZoomLevel,
final int baseZoomLevelTileMatrixWidth,
final int baseZoomLevelTileMatrixHeight)
{
if(minimumZoomLevel < 0)
{
throw new IllegalArgumentException("Minimum zoom level must be at least 0");
}
if(maximumZoomLevel < 0)
{
throw new IllegalArgumentException("Maximum zoom level must be at least 0");
}
if(baseZoomLevelTileMatrixHeight < 1)
{
throw new IllegalArgumentException("The initial height must be greater than 0");
}
if(baseZoomLevelTileMatrixWidth < 1)
{
throw new IllegalArgumentException("The initial width must be greater than 0");
}
if(minimumZoomLevel > maximumZoomLevel)
{
throw new IllegalArgumentException("Minimum zoom level must be less than or equal to the maximum");
}
//if(Integer.MAX_VALUE < baseZoomLevelTileMatrixHeight * Math.pow(2.0, maximumZoomLevel) - 1)
if(baseZoomLevelTileMatrixHeight * StrictMath.pow(BASE_TWO, maximumZoomLevel) - 1 > Integer.MAX_VALUE)
{
throw new IllegalArgumentException("This combination of initial height and maximum zoom level will cause an integer overflow for tile numbering");
}
if(baseZoomLevelTileMatrixWidth * StrictMath.pow(BASE_TWO, maximumZoomLevel) - 1 > Integer.MAX_VALUE)
{
throw new IllegalArgumentException("This combination of initial width and maximum zoom level will cause an integer overflow for tile numbering");
}
this.minimumZoomLevel = minimumZoomLevel;
this.maximumZoomLevel = maximumZoomLevel;
this.zoomLevelDimensions = new TileMatrixDimensions[maximumZoomLevel - minimumZoomLevel + 1];
IntStream.rangeClosed(minimumZoomLevel, maximumZoomLevel).forEach(zoomLevel ->
{
final int zoom = zoomLevel - minimumZoomLevel;
final int twoToTheZoomPower = (int) StrictMath.pow(BASE_TWO, zoom);
this.zoomLevelDimensions[zoom] = new TileMatrixDimensions(baseZoomLevelTileMatrixWidth * twoToTheZoomPower,
baseZoomLevelTileMatrixHeight * twoToTheZoomPower);
});
}
@Override
public TileMatrixDimensions dimensions(final int zoomLevel)
{
if(zoomLevel < this.minimumZoomLevel || zoomLevel > this.maximumZoomLevel)
{
throw new IllegalArgumentException(String.format("Zoom level must be in the range [%d, %d]",
this.minimumZoomLevel,
this.maximumZoomLevel));
}
return this.zoomLevelDimensions[zoomLevel - this.minimumZoomLevel];
}
@Override
public Collection getZoomLevels()
{
return IntStream.rangeClosed(this.minimumZoomLevel,
this.maximumZoomLevel)
.boxed()
.collect(Collectors.toList());
}
private final TileMatrixDimensions[] zoomLevelDimensions;
private final int minimumZoomLevel;
private final int maximumZoomLevel;
}
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