POLY_AREA Function

Standard Library function that returns the area of an n-sided polygon, given the vertices of the polygon.

result = POLY_AREA(x, y)

x An n-element real vector containing the x-coordinates of each vertex in the polygon.

y An n-element real vector containing the y-coordinates of each vertex in the polygon.

result The area of the polygon, returned as a floating-point value.

None.

POLY_AREA assumes that the input polygon has n vertices with n sides, and that the edges connect the vertices in the order [(x₁, y₁), (x₂, y₂ ), ... , (x_n, y_n), (x₁, y₁)]. The last vertex must be connected to the first.

x = [1, 3, 2]
y = [1, 1, 4]
area = POLY_AREA(x, y)
PRINT, area

3.00000

x = [2, 4, 4, 2]
y = [1, 1, 2, 2]
PRINT, POLY_AREA(x, y)

2.00000

POLYFILL, POLYFILLV, POLYSHADE