drawInvertedTriangle function
Draw the Inverted Triangle shape marker
Implementation
void drawInvertedTriangle(
Path path, double x, double y, double width, double height) {
path.moveTo(x + width / 2, y - height / 2);
path.lineTo(x, y + height / 2);
path.lineTo(x - width / 2, y - height / 2);
path.lineTo(x + width / 2, y - height / 2);
path.close();
}