public Object getData(final WModelIndex index, int role) { if (role != ItemDataRole.DisplayRole) { return super.getData(index, role); } double delta_y = (this.yEnd_ - this.yStart_) / (this.getColumnCount() - 2); if (index.getRow() == 0) { if (index.getColumn() == 0) { return 0.0; } return this.yStart_ + (index.getColumn() - 1) * delta_y; } double delta_x = (this.xEnd_ - this.xStart_) / (this.getRowCount() - 2); if (index.getColumn() == 0) { if (index.getRow() == 0) { return 0.0; } return this.xStart_ + (index.getRow() - 1) * delta_x; } double x; double y; y = this.yStart_ + (index.getColumn() - 1) * delta_y; x = this.xStart_ + (index.getRow() - 1) * delta_x; return 4 * Math.sin(Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2))) / Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2)); }