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image/zoom: Functions to calculate required adj

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This commit is contained in:
Sophie Herold 2024-01-02 22:32:17 +01:00
parent 3f4de5f4ad
commit a0e4791e6b
1 changed files with 44 additions and 1 deletions
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45
src/widgets/image/zoom.rs
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@ -81,7 +81,11 @@ impl imp::LpImage {
}
pub(super) fn applicable_zoom(&self) -> f64 {
decoder::tiling::zoom_normalize(self.obj().zoom()) / self.scaling()
self.applicable_zoom_for(self.obj().zoom())
}
pub(super) fn applicable_zoom_for(&self, zoom: f64) -> f64 {
decoder::tiling::zoom_normalize(zoom) / self.scaling()
}
/// Maximal zoom allowed for this image
@ -99,6 +103,45 @@ impl imp::LpImage {
}
}
fn horizontal_bar(&self) -> f64 {
f64::max(
0.,
(self.widget_width() - self.image_displayed_width()) / 2.,
)
}
fn vertical_bar(&self) -> f64 {
f64::max(
0.,
(self.widget_height() - self.image_displayed_height()) / 2.,
)
}
/// Cursor position in image coordinates
fn cursor_position(&self) -> Option<(f64, f64)> {
let (cur_x, cur_y) = self.pointer_position.get()?;
let zoom = self.applicable_zoom();
let x = (cur_x - self.horizontal_bar() + self.hadj_value()) / zoom;
let y = (cur_y - self.vertical_bar() + self.vadj_value()) / zoom;
Some((x, y))
}
// Required adjustment to put specified image coordinate under the cursor
fn adj_for_position(&self, (img_x, img_y): (f64, f64), zoom: f64) -> Option<(f64, f64)> {
let (cur_x, cur_y) = self.pointer_position.get()?;
let zoom = self.applicable_zoom_for(zoom);
// Transform image coordiantes to view coordinates
let (img_x, img_y) = (img_x * zoom, img_y * zoom);
let h_adj = f64::max(0., img_x - cur_x);
let v_adj: f64 = f64::max(0., img_y - cur_y);
Some((h_adj, v_adj))
}
/// Set zoom level aiming for given position or center if not available
pub(super) fn set_zoom_aiming(&self, mut zoom: f64, aiming: Option<(f64, f64)>) {
let obj = self.obj();