obsqrbtz/egui_knob
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logarithmic scaling added; missing the step fn for now

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This commit is contained in:
Julius Schmitt
2026-01-22 20:44:40 +01:00
parent fb3f9d75dc
commit 969ba9bcb5
4 changed files with 50 additions and 30 deletions
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62
src/widget.rs
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@@ -1,4 +1,4 @@
use egui::{Color32, Response, Sense, Ui, Widget};
use egui::{remap, Color32, Response, Sense, Ui, Widget};
use crate::config::KnobConfig;
use crate::render::KnobRenderer;
@@ -168,16 +168,25 @@ impl<'a> Knob<'a> {
self.config.allow_scroll = true;
self
}
pub fn with_logarithmic_scaling(mut self) -> Self {
self.config.logarithmic_scaling = true;
self
}
}
impl Widget for Knob<'_> {
fn ui(self, ui: &mut Ui) -> Response {
fn ui(mut self, ui: &mut Ui) -> Response {
if self.value.is_nan() {
*self.value = self.min;
}
let current_value = *self.value;
let renderer = KnobRenderer::new(&self.config, current_value, self.min, self.max);
let mut raw = if self.config.logarithmic_scaling {
remap(*self.value, self.min..=self.max, 1.0..=10.0).log(10.0)
} else {
remap(*self.value, self.min..=self.max, 0.0..=1.0)
};
let renderer = KnobRenderer::new(&self.config, *self.value, raw, self.min, self.max);
let adjusted_size = renderer.calculate_size(ui);
let (rect, response) = ui.allocate_exact_size(adjusted_size, Sense::click_and_drag());
@@ -185,36 +194,44 @@ impl Widget for Knob<'_> {
let mut response = response;
if response.dragged() {
let delta = response.drag_delta().y;
let range = self.max - self.min;
let range = 1.0;
let step = self.config.step.unwrap_or(range * self.config.drag_sensitivity);
let new_value = (*self.value - delta * step).clamp(self.min, self.max);
raw = (raw - delta * step).clamp(0.0,1.0);
*self.value = if let Some(step) = self.config.step {
let steps = ((new_value - self.min) / step).round();
(self.min + steps * step).clamp(self.min, self.max)
/*raw = if let Some(step) = self.config.step {
let steps = ((raw - 1.0) / step).round();
(steps * step).clamp(1.0, 2.0)
} else {
new_value
};
raw
};*/
if self.value.is_nan() {
*self.value = self.min;
}
/*if self.value.is_nan() {
*self.value = 0.0;
}*/
response.mark_changed();
} else if response.double_clicked() {
if let Some(reset_value) = self.config.reset_value {
*self.value = reset_value
}
} else if response.hovered() & self.config.allow_scroll {
} else if response.hovered() & self.config.allow_scroll {
if let Some(scoll) = ui.input(|input| {
input.events.iter().find_map(|e| match e {
egui::Event::MouseWheel { delta, .. } => Some(*delta),
_ => None,
})
}) {
*self.value = (*self.value
raw = (raw
+ scoll.y * self.config.step.unwrap_or(self.config.drag_sensitivity))
.clamp(self.min, self.max);
.clamp(0.0, 1.0);
}
}
*self.value = if self.config.logarithmic_scaling {
remap(10f32.powf(raw), 1.0..=10.0, self.min..=self.max)
}else {
remap(raw, 0.0..=1.0, self.min..=self.max)
};
if response.double_clicked() {
if let Some(reset_value) = self.config.reset_value {
*self.value = reset_value
}
}
@@ -222,8 +239,7 @@ impl Widget for Knob<'_> {
let center = knob_rect.center();
let radius = self.config.size / 2.0;
let updated_value = *self.value;
let updated_renderer = KnobRenderer::new(&self.config, updated_value, self.min, self.max);
let updated_renderer = KnobRenderer::new(&self.config, *self.value, raw, self.min, self.max);
updated_renderer.render_knob(ui.painter(), center, radius, response.hovered());
updated_renderer.render_label(ui, rect);