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image: Limit rubberbanding zoom and add stiffness

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This commit is contained in:
Sophie Herold 2023-02-07 21:56:00 +01:00
parent 74a067e3b8
commit caefec74b4
1 changed files with 28 additions and 2 deletions
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30
src/widgets/image.rs
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@ -45,6 +45,11 @@ const ZOOM_FACTOR_WHEEL_HI_RES: f64 = 0.001;
/// Relative to best-fit level
const ZOOM_FACTOR_DOUBLE_TAP: f64 = 2.5;
/// Relative to best-fit and `MAX_ZOOM_LEVEL`
const ZOOM_FACTOR_MAX_RUBBERBAND: f64 = 2.;
/// Smaller values make the band feel stiffer
const RUBBERBANDING_EXPONENT: f64 = 0.4;
/// Max zoom level 2000%
const MAX_ZOOM_LEVEL: f64 = 20.0;
@ -873,8 +878,29 @@ impl LpImage {
}
/// Set zoom level aiming for given position or center if not available
fn set_zoom_aiming(&self, zoom: f64, aiming: Option<(f64, f64)>) {
if zoom == self.zoom() || zoom <= 0. {
fn set_zoom_aiming(&self, mut zoom: f64, aiming: Option<(f64, f64)>) {
// allow some deviantion from max value for rubberbanding
if zoom > MAX_ZOOM_LEVEL {
let max_deviation = MAX_ZOOM_LEVEL * ZOOM_FACTOR_MAX_RUBBERBAND;
let deviation = zoom / MAX_ZOOM_LEVEL;
zoom = f64::min(
MAX_ZOOM_LEVEL * deviation.powf(RUBBERBANDING_EXPONENT),
max_deviation,
);
}
if zoom < self.zoom_level_best_fit() {
let minimum = self.zoom_level_best_fit();
let max_deviation = minimum / ZOOM_FACTOR_MAX_RUBBERBAND;
let deviation = zoom / minimum;
zoom = f64::max(
minimum * deviation.powf(RUBBERBANDING_EXPONENT),
max_deviation,
);
dbg!(zoom);
}
if zoom == self.zoom() {
return;
}