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BitmapTileLayer: alpha fade improvements (#661)

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Gustl22 2019-02-18 01:00:10 +01:00 committed by Emux
parent a443e732f5
commit 5887d5c6a2
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GPG Key ID: 64ED9980896038C3
1 changed files with 21 additions and 6 deletions
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27
vtm/src/org/oscim/layers/tile/bitmap/BitmapTileLayer.java
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@ -2,6 +2,7 @@
* Copyright 2013 Hannes Janetzek
* Copyright 2017 Andrey Novikov
* Copyright 2017-2018 devemux86
* Copyright 2019 Gustl22
*
* This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
*
@ -38,6 +39,10 @@ public class BitmapTileLayer extends TileLayer {
private static final int CACHE_LIMIT = 40;
protected final TileSource mTileSource;
/**
* Bitmap alpha in range 0 to 1.
*/
private float mBitmapAlpha = 1.0f;
public static class FadeStep {
@ -45,7 +50,15 @@ public class BitmapTileLayer extends TileLayer {
public final double zoomStart, zoomEnd;
public final float alphaStart, alphaEnd;
/**
* @param zoomStart the zoom start in range {@value org.oscim.map.Viewport#MIN_ZOOM_LEVEL} to {@value org.oscim.map.Viewport#MAX_ZOOM_LEVEL}
* @param zoomEnd the zoom end, must be greater than zoom start
* @param alphaStart the alpha start value in range 0 to 1
* @param alphaEnd the alpha end value in range 0 to 1
*/
public FadeStep(int zoomStart, int zoomEnd, float alphaStart, float alphaEnd) {
if (zoomEnd < zoomStart)
throw new IllegalArgumentException("zoomEnd must be larger than zoomStart");
this.scaleStart = 1 << zoomStart;
this.scaleEnd = 1 << zoomEnd;
this.zoomStart = zoomStart;
@ -55,6 +68,8 @@ public class BitmapTileLayer extends TileLayer {
}
public FadeStep(double scaleStart, double scaleEnd, float alphaStart, float alphaEnd) {
if (scaleEnd < scaleStart)
throw new IllegalArgumentException("scaleEnd must be larger than scaleStart");
this.scaleStart = scaleStart;
this.scaleEnd = scaleEnd;
this.zoomStart = Math.log(scaleStart) / Math.log(2);
@ -85,16 +100,16 @@ public class BitmapTileLayer extends TileLayer {
tileSource.getZoomLevelMax());
mTileSource = tileSource;
mBitmapAlpha = bitmapAlpha;
tileRenderer().setBitmapAlpha(mBitmapAlpha);
setBitmapAlpha(bitmapAlpha, false);
initLoader(getNumLoaders());
setFade(map.getMapPosition());
}
public void setBitmapAlpha(float bitmapAlpha) {
mBitmapAlpha = bitmapAlpha;
public void setBitmapAlpha(float bitmapAlpha, boolean redraw) {
mBitmapAlpha = FastMath.clamp(bitmapAlpha, 0f, 1f);
tileRenderer().setBitmapAlpha(mBitmapAlpha);
map().updateMap(true);
if (redraw)
map().updateMap(true);
}
@Override
@ -129,7 +144,7 @@ public class BitmapTileLayer extends TileLayer {
break;
}
alpha = FastMath.clamp(alpha, 0f, mBitmapAlpha);
alpha = FastMath.clamp(alpha, 0f, 1f) * mBitmapAlpha;
tileRenderer().setBitmapAlpha(alpha);
}