The Radar Chart is based on the Polar Area Chart in that it draws its contents on a circular grid, with a single “axis” where zero is at the center and the maximum value is at the perimeter. The Radar Chart however displays all segments by connecting the exact center of the outer perimeter spans of each segment into a single enclosed area. The “grid” on which the Radar Chart is different than that of the Pie and Doughnut Charts in that it represents both value and time on the same “axis” with the center line representing value (what would be the Y-Axis is a Bar Chart with time represented on the other “spokes” of the grid). The segment connection, multi-variable grid and resulting single enclosed area (the actual Radar Chart) are displayed in the images below.
Due to the visual nature of the grid of the Polar Area Chart, as seen above, this chart is sometimes referred to as the “Spider Chart”, “Web Chart” or “Spider Web”. As is the case with all other charts in Ninox, hovering the mouse over the point where each segment intersects a “spoke” on the grid will cause a hover help window to appear containing the value represented at that point. This is demonstrated for the month of June in the image below.