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Update slider example #565

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Full range of slider is half the ::MIN/MAX for f32/f64
This commit is contained in:
dbr 2021-11-16 12:59:37 +11:00
parent da549297b7
commit 2ac1a56ec5
2 changed files with 24 additions and 3 deletions
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22
imgui-examples/examples/slider.rs
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@ -43,17 +43,25 @@ fn example_1(ui: &Ui, state: &mut State) {
ui.text("Unsigned: u8 u16 u32 u64"); ui.text("Unsigned: u8 u16 u32 u64");
ui.text("Floats: f32 f64"); ui.text("Floats: f32 f64");
Slider::new("u8 value", 0, 255) // Full ranges can be specified with Rust's `::MIN/MAX` constants
Slider::new("u8 value", u8::MIN, u8::MAX)
.build(ui, &mut state.u8_value); .build(ui, &mut state.u8_value);
Slider::new("f32 value", -f32::MIN, f32::MAX) // However for larger data-types, it's usually best to specify
// a much smaller range. The following slider is hard to use.
Slider::new("Full range f32 value", -f32::MIN/2.0, f32::MAX/2.0)
.build(ui, &mut state.f32_value); .build(ui, &mut state.f32_value);
// Note the `... / 2.0` - anything larger is not supported by
// the upstream C++ library
ui.text("Note that for 32-bit/64-bit types, sliders are always limited to half of the natural type range!");
// Most of the time, it's best to specify the range
ui.separator(); ui.separator();
ui.text("Slider range can be limited:"); ui.text("Slider range can be limited:");
Slider::new("i32 value with range", -999, 999) Slider::new("i32 value with range", -999, 999)
.build(ui, &mut state.i32_value); .build(ui, &mut state.i32_value);
ui.text("Note that for 32-bit/64-bit types, sliders are always limited to half of the natural type range!"); Slider::new("f32 value", -10.0, 10.0)
.build(ui, &mut state.f32_value);
ui.separator(); ui.separator();
ui.text("Value formatting can be customized with a C-style printf string:"); ui.text("Value formatting can be customized with a C-style printf string:");
@ -61,6 +69,14 @@ fn example_1(ui: &Ui, state: &mut State) {
.display_format("%09.0f") .display_format("%09.0f")
.build(ui, &mut state.f64_formatted); .build(ui, &mut state.f64_formatted);
// This formatting impacts the increments the slider operates in:
Slider::new("f32 with %.01f", 0.0, 1.0)
.display_format("%.01f")
.build(ui, &mut state.f32_value);
Slider::new("Same f32 with %.05f", 0.0, 1.0)
.display_format("%.05f")
.build(ui, &mut state.f32_value);
ui.separator(); ui.separator();
ui.text("Vertical sliders require a size parameter but otherwise work in a similar way:"); ui.text("Vertical sliders require a size parameter but otherwise work in a similar way:");
VerticalSlider::new("vertical\nu8 value", [50.0, 50.0], u8::MIN, u8::MAX) VerticalSlider::new("vertical\nu8 value", [50.0, 50.0], u8::MIN, u8::MAX)

5
imgui/src/widget/slider.rs
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@ -67,6 +67,11 @@ where
/// ///
/// It is safe, though up to C++ Dear ImGui, on how to handle when /// It is safe, though up to C++ Dear ImGui, on how to handle when
/// `min > max`. /// `min > max`.
///
/// Note for f32 and f64 sliders, Dear ImGui limits the available
/// range to half their full range (e.g `-f32::MIN/2.0 .. f32::MAX/2.0`)
/// Specifying a value above this will cause an abort.
/// For large ranged values, consider using [`Ui::input_scalar`] instead
#[inline] #[inline]
pub fn range(mut self, min: Data, max: Data) -> Self { pub fn range(mut self, min: Data, max: Data) -> Self {
self.min = min; self.min = min;