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Code Issues Releases Wiki Activity

more percice scale float?

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This commit is contained in:
Robin Appelman 2021-07-20 21:24:13 +02:00
commit d00c1a8f32
1 changed files with 21 additions and 5 deletions
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26
src/demo/sendprop.rs
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@ -618,6 +618,11 @@ impl fmt::Display for SendPropValue {
}
}
fn float_scale(bit_count: u8) -> f32 {
// is this -1 correct?, it is consistent with the js version but seems weird
(1i32.wrapping_shl(bit_count as u32)) as f32 - 1.0
}
impl SendPropValue {
pub fn parse(stream: &mut Stream, definition: &SendPropParseDefinition) -> Result<Self> {
match definition {
@ -768,9 +773,8 @@ impl SendPropValue {
high,
} => {
let raw: u32 = stream.read_int(*bit_count as usize)?;
// is this -1 correct?, it is consistent with the js version but seems weird
let percentage =
(raw as f32) / ((1i32.wrapping_shl(*bit_count as u32)) as f32 - 1.0);
let scale = float_scale(*bit_count);
let percentage = (raw as f32) / scale;
Ok(low + ((high - low) * percentage))
}
}
@ -802,8 +806,8 @@ impl SendPropValue {
high,
} => {
let percentage = (val - low) / (high - low);
let raw =
(percentage * ((1i32.wrapping_shl(*bit_count as u32)) as f32 - 1.0)) as u32;
let scale = float_scale(*bit_count);
let raw = (percentage * scale).round() as u32;
raw.write_sized(stream, *bit_count as usize)?;
Ok(())
@ -926,6 +930,18 @@ fn test_send_prop_value_roundtrip() {
count_bit_count: 5,
},
);
send_prop_value_roundtrip(
SendPropValue::Float(76.22549),
SendPropParseDefinition::Float {
changes_often: false,
definition: FloatDefinition::Scaled {
bit_count: 10,
high: 102.3,
low: 0.09990235,
},
},
);
}
impl From<i32> for SendPropValue {