Function _polygon_area

plotly/figure_factory/_ternary_contour.py:228–229

(x, y)

def _polygon_area(x, y):
    return 0.5 * np.abs(np.dot(x, np.roll(y, 1)) - np.dot(y, np.roll(x, 1)))


def _colors(ncontours, colormap=None):