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This commit is contained in:
Hannes Janetzek 2013-09-20 13:55:47 +02:00
parent f049673412
commit 4fadd929ee
1 changed files with 25 additions and 18 deletions
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27
vtm/src/org/oscim/utils/ScanBox.java
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@ -18,19 +18,26 @@ package org.oscim.utils;
import org.oscim.core.Tile;
/**
* Scan-line fill algorithm to retrieve tile-coordinates.
* Scan-line fill algorithm to retrieve tile-coordinates from
* Viewport.
* <p>
* ScanBox is used to calculate tile coordinates that intersect the box (or
* trapezoid) which is the projection of screen bounds to the map. Usage:
*
* ScanBox is used to calculate tile coordinates that intersect
* the box (or trapezoid) which is the projection of screen
* bounds to the map.
*
* use:
* <pre>
* Viewport.getMapViewProjection(box)
* yourScanBox.scan(pos.x, pos.y, pos.scale, zoomLevel, coords);
* ScanBox sb = new ScanBox(){
* @Override
* protected void setVisible(int y, int x1, int x2) {
* }
* };
* sb.scan(pos.x, pos.y, pos.scale, * zoomLevel, coords);
*
* where zoomLevel is the zoom-level for which tile coordinates
* should be calculated.
* */
* </pre>
*
* where zoomLevel is the zoom-level for which tile coordinates should be
* calculated.
*/
public abstract class ScanBox {
private final float[] mBox = new float[8];