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Submodule horizon-ui
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,88 +1,2 @@ | ||
| use bevy::prelude::{Color, Gizmos, Quat, Vec3}; | ||
|
|
||
| pub struct ArrowBuilder<'a, 's> { | ||
| gizmos: &'a mut Gizmos<'s>, | ||
| start: Vec3, | ||
| end: Vec3, | ||
| color: Color, | ||
| tip_length: f32, | ||
| } | ||
|
|
||
| /// A builder returned by [`Gizmos::arrow`] and [`Gizmos::arrow_2d`] | ||
| impl ArrowBuilder<'_, '_> { | ||
| /// Change the length of the tips to be `length`. | ||
| /// The default tip length is [length of the arrow]/10. | ||
| /// | ||
| /// # Example | ||
| /// ``` | ||
| /// # use bevy_gizmos::prelude::*; | ||
| /// # use bevy_render::prelude::*; | ||
| /// # use bevy_math::prelude::*; | ||
| /// fn system(mut gizmos: Gizmos) { | ||
| /// gizmos.arrow(Vec3::ZERO, Vec3::ONE, Color::GREEN) | ||
| /// .with_tip_length(3.); | ||
| /// } | ||
| /// # bevy_ecs::system::assert_is_system(system); | ||
| /// ``` | ||
| #[doc(alias = "arrow_head_length")] | ||
| pub fn with_tip_length(&mut self, length: f32) { | ||
| self.tip_length = length; | ||
| } | ||
| } | ||
|
|
||
| impl Drop for ArrowBuilder<'_, '_> { | ||
| /// Draws the arrow, by drawing lines with the stored [`Gizmos`] | ||
| fn drop(&mut self) { | ||
| // first, draw the body of the arrow | ||
| self.gizmos.line(self.start, self.end, self.color); | ||
| // now the hard part is to draw the head in a sensible way | ||
| // put us in a coordinate system where the arrow is pointing towards +x and ends at the origin | ||
| let pointing = (self.end - self.start).normalize(); | ||
| let rotation = Quat::from_rotation_arc(Vec3::X, pointing); | ||
| let tips = [ | ||
| Vec3::new(-1., 1., 0.), | ||
| Vec3::new(-1., 0., 1.), | ||
| Vec3::new(-1., -1., 0.), | ||
| Vec3::new(-1., 0., -1.), | ||
| ]; | ||
| // - extend the vectors so their length is `tip_length` | ||
| // - rotate the world so +x is facing in the same direction as the arrow | ||
| // - translate over to the tip of the arrow | ||
| let tips = tips.map(|v| rotation * (v.normalize() * self.tip_length) + self.end); | ||
| for v in tips { | ||
| // then actually draw the tips | ||
| self.gizmos.line(self.end, v, self.color); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| pub trait ArrowGizmos<'s> { | ||
| fn arrow(&mut self, start: Vec3, end: Vec3, color: Color) -> ArrowBuilder<'_, 's> ; | ||
| } | ||
|
|
||
| impl<'s> ArrowGizmos<'s> for Gizmos<'s> { | ||
| /// Draw an arrow in 3D, from `start` to `end`. Has four tips for convienent viewing from any direction. | ||
| /// | ||
| /// This should be called for each frame the arrow needs to be rendered. | ||
| /// | ||
| /// # Example | ||
| /// ``` | ||
| /// # use bevy_gizmos::prelude::*; | ||
| /// # use bevy_render::prelude::*; | ||
| /// # use bevy_math::prelude::*; | ||
| /// fn system(mut gizmos: Gizmos) { | ||
| /// gizmos.arrow(Vec3::ZERO, Vec3::ONE, Color::GREEN); | ||
| /// } | ||
| /// # bevy_ecs::system::assert_is_system(system); | ||
| /// ``` | ||
| fn arrow(&mut self, start: Vec3, end: Vec3, color: Color) -> ArrowBuilder<'_, 's> { | ||
| let length = (end - start).length(); | ||
| ArrowBuilder { | ||
| gizmos: self, | ||
| start, | ||
| end, | ||
| color, | ||
| tip_length: length / 10., | ||
| } | ||
| } | ||
| } |
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