| 73 | } |
| 74 | |
| 75 | fn inverted(&self) -> Option<Self> { |
| 76 | match self { |
| 77 | Self::Identity => Some(Self::Identity), |
| 78 | Self::Affine { scale, translate } => { |
| 79 | if !scale.is_finite() || scale.abs() <= f64::EPSILON || !translate.is_finite() { |
| 80 | return None; |
| 81 | } |
| 82 | Some(Self::Affine { |
| 83 | scale: 1.0 / scale, |
| 84 | translate: -translate / scale, |
| 85 | }) |
| 86 | } |
| 87 | Self::Log { base } => Some(Self::Exp { base: *base }), |
| 88 | Self::Exp { base } => Some(Self::Log { base: *base }), |
| 89 | Self::Then(first, second) => Some(second.inverted()?.then(first.inverted()?)), |
| 90 | } |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | /// A one-dimensional coordinate transform for a series or reference line. |