android - Rotate marker to the device heading at precise location when map is rotating. -


using new version of mapsforge 0.5.1, map rotates fine onsensorchanged event. have added custom gps location marker @ gps point on onlocationchanged event. when map rotates, marker rotated point towards device heading in google maps using following code in marker's draw method.

android.graphics.canvas androidcanvas = androidgraphicfactory.getcanvas(canvas); androidcanvas.save(); float px = (float) canvas.getwidth()/2; float py = (float) canvas.getheight()/2; androidcanvas.rotate(degree, px, py); canvas.drawbitmap(bitmap, left, top); androidcanvas.restore();

enter image description here

however when map dragged, marker's position disorients previous point of gps location.

enter image description here

how calculate px , py value keep marker @ precise point of gps location on map when map rotating , marker pointing device heading.

i know bit old, future researches found solution :

  • first extend mapsforge marker , override draw() method
  • copy paste content of draw method marker
  • then add following in last condition :

replace :

if(canvasrectangle.intersects(bitmaprectangle)) {     canvas.drawbitmap(bitmap, left, top); }

with :

if(canvasrectangle.intersects(bitmaprectangle)) {     // rotate marker based on bearing example (or whatever angle want)     android.graphics.canvas androidcanvas = androidgraphicfactory.getcanvas(canvas);     androidcanvas.save();      float px = (right + left) / 2f;     float py = (bottom + top) / 2f;      androidcanvas.rotate(bearing, px, py);     canvas.drawbitmap(bitmap, left, top);     androidcanvas.restore(); }

in case "bearing" member variable of class extenting marker, set 2 different locations earlier in code (gps location). can replace angle suits needs.


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