Location renderers: allow fixed center position

vtm/src/org/oscim/map/ViewController.java

@@ -1,4 +1,5 @@
 /*
+ * Copyright 2014 Hannes Janetzek
  * Copyright 2016-2019 devemux86
  * Copyright 2017 Luca Osten
  * Copyright 2018 Izumi Kawashima
@@ -74,21 +75,49 @@ public class ViewController extends Viewport {
     }
 
     /**
-     * Get pivot horizontal / vertical relative to view center.
+     * Get pivot horizontal / vertical relative to view center in [-1, 1].
      * e.g. pivotY 0.5 is usually preferred for navigation, moving center to 25% of view height.
-     * Range is [-1, 1].
      */
     public float[] getMapViewCenter() {
         return new float[]{mPivotX, mPivotY};
     }
 
     /**
-     * Set pivot horizontal / vertical relative to view center.
+     * Get pivot horizontal relative to view center in [-1, 1].
+     */
+    public float getMapViewCenterX() {
+        return mPivotX;
+    }
+
+    /**
+     * Get pivot vertical relative to view center in [-1, 1].
+     * e.g. pivotY 0.5 is usually preferred for navigation, moving center to 25% of view height.
+     */
+    public float getMapViewCenterY() {
+        return mPivotY;
+    }
+
+    /**
+     * Set pivot horizontal / vertical relative to view center in [-1, 1].
      * e.g. pivotY 0.5 is usually preferred for navigation, moving center to 25% of view height.
-     * Range is [-1, 1].
      */
     public void setMapViewCenter(float pivotX, float pivotY) {
+        setMapViewCenterX(pivotX);
+        setMapViewCenterY(pivotY);
+    }
+
+    /**
+     * Set pivot horizontal relative to view center in [-1, 1].
+     */
+    public void setMapViewCenterX(float pivotX) {
         mPivotX = FastMath.clamp(pivotX, -1, 1) * 0.5f;
+    }
+
+    /**
+     * Set pivot horizontal / vertical relative to view center in [-1, 1].
+     * e.g. pivotY 0.5 is usually preferred for navigation, moving center to 25% of view height.
+     */
+    public void setMapViewCenterY(float pivotY) {
         mPivotY = FastMath.clamp(pivotY, -1, 1) * 0.5f;
     }
 

vtm/src/org/oscim/renderer/LocationRenderer.java

@@ -66,6 +66,7 @@ public class LocationRenderer extends LayerRenderer {
     private boolean mRunAnim;
     private boolean mAnimate = true;
     private long mAnimStart;
+    private boolean mCenter;
 
     private Callback mCallback;
     private final float[] mColors = new float[4];
@@ -97,6 +98,10 @@ public class LocationRenderer extends LayerRenderer {
         mCallback = callback;
     }
 
+    public void setCenter(boolean center) {
+        mCenter = center;
+    }
+
     public void setColor(int color) {
         float a = Color.aToFloat(color);
         mColors[0] = a * Color.rToFloat(color);
@@ -176,12 +181,17 @@ public class LocationRenderer extends LayerRenderer {
         int width = mMap.getWidth();
         int height = mMap.getHeight();
 
+        double x, y;
+        if (mCenter) {
+            x = (width >> 1) + width * mMap.viewport().getMapViewCenterX();
+            y = (height >> 1) + height * mMap.viewport().getMapViewCenterY();
+        } else {
             // clamp location to a position that can be
-        // savely translated to screen coordinates
+            // safely translated to screen coordinates
             v.getBBox(mBBox, 0);
 
-        double x = mLocation.x;
+            x = mLocation.x;
-        double y = mLocation.y;
+            y = mLocation.y;
 
             if (!mBBox.contains(mLocation)) {
                 x = FastMath.clamp(x, mBBox.xmin, mBBox.xmax);
@@ -192,8 +202,9 @@ public class LocationRenderer extends LayerRenderer {
             // screen center
             v.toScreenPoint(x, y, mScreenPoint);
 
-        x = mScreenPoint.x + width / 2;
+            x = mScreenPoint.x + (width >> 1);
-        y = mScreenPoint.y + height / 2;
+            y = mScreenPoint.y + (height >> 1);
+        }
 
         // clip position to screen boundaries
         int visible = 0;

vtm/src/org/oscim/renderer/LocationTextureRenderer.java

@@ -1,6 +1,6 @@
 /*
  * Copyright 2017-2018 Longri
- * Copyright 2018 devemux86
+ * Copyright 2018-2019 devemux86
  *
  * This program is free software: you can redistribute it and/or modify it under the
  * terms of the GNU Lesser General Public License as published by the Free Software
@@ -98,6 +98,7 @@ public class LocationTextureRenderer extends BucketRenderer {
     private boolean runAnim;
     private boolean animate = true;
     private long animStart;
+    private boolean center;
     private boolean update;
     private float bearing;
 
@@ -124,6 +125,10 @@ public class LocationTextureRenderer extends BucketRenderer {
         this.billboard = billboard;
     }
 
+    public void setCenter(boolean center) {
+        this.center = center;
+    }
+
     public void setIndicatorColor(int color) {
         this.viewShedColor = color;
     }
@@ -194,10 +199,16 @@ public class LocationTextureRenderer extends BucketRenderer {
 
         int width = map.getWidth();
         int height = map.getHeight();
+
+        double x, y;
+        if (center) {
+            x = (width >> 1) + width * map.viewport().getMapViewCenterX();
+            y = (height >> 1) + height * map.viewport().getMapViewCenterY();
+        } else {
             v.getBBox(boundingBox, 0);
 
-        double x = mapPoint.x;
+            x = mapPoint.x;
-        double y = mapPoint.y;
+            y = mapPoint.y;
 
             if (!boundingBox.contains(mapPoint)) {
                 x = FastMath.clamp(x, boundingBox.xmin, boundingBox.xmax);
@@ -210,6 +221,7 @@ public class LocationTextureRenderer extends BucketRenderer {
 
             x = screenPoint.x + width / 2;
             y = screenPoint.y + height / 2;
+        }
 
         // clip position to screen boundaries
         int visible = 0;