perspective property Null safety

double perspective

Perspective of the cylindrical projection.

A number between 0 and 0.01 where 0 means looking at the cylinder from infinitely far with an infinitely small field of view and 1 means looking at the cylinder from infinitely close with an infinitely large field of view (which cannot be rendered).

Defaults to an arbitrary but aesthetically reasonable number of 0.003. A larger number brings the vanishing point closer and a smaller number pushes the vanishing point further.

Must not be null and must be positive.

Implementation

double get perspective => _perspective;
void perspective= (double value)

Implementation

set perspective(double value) {
  assert(value != null);
  assert(value > 0);
  assert(
    value <= 0.01,
    perspectiveTooHighMessage,
  );
  if (value == _perspective)
    return;
  _perspective = value;
  markNeedsPaint();
  markNeedsSemanticsUpdate();
}