drawLine method
Implementation
void drawLine(double x1, double y1, double x2, double y2, UiPaint paint) {
//_log.info("draw line at $x1 $y1 $x2 $y2 $paint}");
UiPath path = UiPath()
..moveTo(x1, y1)
..lineTo(x2, y2);
drawPath(path, paint);
}