Absolute cartogram sizing

[addu390]

To accomplish plotting a cartogram with fixed cell-size:

• Calculate the cell size for the given year and cell radius. The year here translates to the population count - the total population/ number of cells.
• However, in a contiguous cartogram, the tesselation of the plane is done only after plotting the cartogram (displacing boundary co-ordinate chain). Hence, the basic idea is to calculate an additional reduction factor to further scale up or down the cartogram until the given cell size is met.

Some of the known disadvantages are:

• Cell size (population count per cell, example: 1 cell = 2 million people) can only range within a small threshold, as scaling up or down beyond a point is likely, not possible, or not visually pleasing.
• Accuracy of the cell size beyond one decimal place can be challenging, given the approach to backpropagate from the reduction factor.

Todo:

• Heuristic-based Fixed mode in the UI
• Back-propgatation method to increase the precision of cell-size
• SVG viewbox manual zoom