obsqrbtz/egui_knob
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nit: cleaned up ui a bit

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This commit is contained in:
Daniel Dada
2025-11-21 01:03:52 +03:00
parent 14a143708f
commit a2a102cdb6
7 changed files with 53 additions and 39 deletions
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71
src/render.rs
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@@ -32,11 +32,18 @@ impl<'a> KnobRenderer<'a> {
pub fn render_knob(&self, painter: &Painter, center: Pos2, radius: f32, hovered: bool) {
let knob_color = if hovered {
self.config.colors.knob_color.linear_multiply(1.2)
self.config.colors.knob_color.linear_multiply(1.15)
} else {
self.config.colors.knob_color
};
// TODO: make an option
painter.circle_filled(
center,
radius - self.config.stroke_width / 2.0,
self.config.colors.knob_color.gamma_multiply(0.15),
);
painter.circle_stroke(
center,
radius,
@@ -50,11 +57,11 @@ impl<'a> KnobRenderer<'a> {
let angle = self.compute_angle();
match self.config.style {
KnobStyle::Wiper => {
let pointer = center + Vec2::angled(angle) * (radius * 0.7);
let pointer = center + Vec2::angled(angle) * (radius * 0.65);
painter.line_segment(
[center, pointer],
Stroke::new(
self.config.stroke_width * 1.5,
self.config.stroke_width * 1.2,
self.config.colors.line_color,
),
);
@@ -63,7 +70,7 @@ impl<'a> KnobRenderer<'a> {
let dot_pos = center + Vec2::angled(angle) * (radius * 0.7);
painter.circle_filled(
dot_pos,
self.config.stroke_width * 1.5,
self.config.stroke_width * 1.8,
self.config.colors.line_color,
);
}
@@ -73,9 +80,9 @@ impl<'a> KnobRenderer<'a> {
fn render_background_arc(&self, painter: &Painter, center: Pos2, radius: f32) {
let arc_start = self.config.min_angle;
let arc_end = self.config.max_angle;
let segments = 64;
let arc_color = self.config.colors.knob_color.gamma_multiply(0.5);
let arc_radius = radius * 0.8;
let segments = 128;
let arc_color = self.config.colors.knob_color.gamma_multiply(0.35);
let arc_radius = radius * 0.85;
let mut points = Vec::with_capacity(segments + 1);
for i in 0..=segments {
@@ -95,18 +102,23 @@ impl<'a> KnobRenderer<'a> {
* ((self.value - self.min) / (self.max - self.min)).clamp(0.0, 1.0))
as usize;
let mut fill_points = Vec::with_capacity(filled_segments + 1);
for i in 0..=filled_segments {
let t = i as f32 / segments as f32;
let angle = arc_start + (arc_end - arc_start) * t;
let pos = center + Vec2::angled(angle) * arc_radius;
fill_points.push(pos);
}
if filled_segments > 0 {
let mut fill_points = Vec::with_capacity(filled_segments + 1);
for i in 0..=filled_segments {
let t = i as f32 / segments as f32;
let angle = arc_start + (arc_end - arc_start) * t;
let pos = center + Vec2::angled(angle) * arc_radius;
fill_points.push(pos);
}
painter.add(egui::Shape::line(
fill_points,
Stroke::new(self.config.stroke_width, self.config.colors.line_color),
));
painter.add(egui::Shape::line(
fill_points,
Stroke::new(
self.config.stroke_width * 1.2,
self.config.colors.line_color,
),
));
}
}
}
@@ -114,26 +126,23 @@ impl<'a> KnobRenderer<'a> {
if let Some(label) = &self.config.label {
let label_text = format!("{}: {}", label, (self.config.label_format)(self.value));
let font_id = egui::FontId::proportional(self.config.font_size);
let label_padding = 2.0;
let label_padding = 4.0;
let (label_pos, alignment) = match self.config.label_position {
LabelPosition::Top => (
Vec2::new(
rect.center().x,
rect.min.y - self.config.label_offset + label_padding,
),
Vec2::new(rect.center().x, rect.min.y + label_padding),
Align2::CENTER_TOP,
),
LabelPosition::Bottom => (
Vec2::new(rect.center().x, rect.max.y + self.config.label_offset),
Vec2::new(rect.center().x, rect.max.y - label_padding),
Align2::CENTER_BOTTOM,
),
LabelPosition::Left => (
Vec2::new(rect.min.x - self.config.label_offset, rect.center().y),
Vec2::new(rect.min.x + label_padding, rect.center().y),
Align2::LEFT_CENTER,
),
LabelPosition::Right => (
Vec2::new(rect.max.x + self.config.label_offset, rect.center().y),
Vec2::new(rect.max.x - label_padding, rect.center().y),
Align2::RIGHT_CENTER,
),
};
@@ -149,7 +158,7 @@ impl<'a> KnobRenderer<'a> {
}
pub fn calculate_size(&self, ui: &Ui) -> Vec2 {
let knob_size = Vec2::splat(self.config.size);
let knob_size = Vec2::splat(self.config.size + self.config.stroke_width * 2.0);
let label_size = if let Some(label) = &self.config.label {
let font_id = egui::FontId::proportional(self.config.font_size);
@@ -161,16 +170,16 @@ impl<'a> KnobRenderer<'a> {
Vec2::ZERO
};
let label_padding = 2.0;
let label_padding = 8.0;
match self.config.label_position {
LabelPosition::Top | LabelPosition::Bottom => Vec2::new(
knob_size.x.max(label_size.x + label_padding * 2.0),
knob_size.y + label_size.y + label_padding * 2.0 + self.config.label_offset,
knob_size.y + label_size.y + label_padding + self.config.label_offset,
),
LabelPosition::Left | LabelPosition::Right => Vec2::new(
knob_size.x + label_size.x + label_padding * 2.0 + self.config.label_offset,
knob_size.y.max(label_size.y + label_padding * 2.0),
knob_size.x + label_size.x + label_padding + self.config.label_offset,
knob_size.y.max(label_size.y + label_padding),
),
}
}