final HexGridPlotter picture = new HexGridPlotter(width, height, drawMode, color_back, cellsize);
picture.drawGrid(color_grid);
// calculate dimensions for left and right column
final int gridLeft = 0;
int gridRight = picture.gridWidth() - 2;
if ((gridRight & 1) == 0) gridRight--;
// draw home peer
final int centerx = (picture.gridWidth() >> 1) - 1;
final int centery = picture.gridHeight() >> 1;