ability to draw arrows in scene debug drawing context

- #462

src/scene/debug.rs

@@ -3,11 +3,10 @@
 //! For more info see [`SceneDrawingContext`]
 
 use crate::core::{
- algebra::{Matrix4, Point3, Vector2, Vector3},
+ algebra::{Matrix4, Point3, UnitQuaternion, Vector2, Vector3},
  color::{Color, Hsl},
  math::{aabb::AxisAlignedBoundingBox, frustum::Frustum, Matrix4Ext},
 };
-use fyrox_core::algebra::UnitQuaternion;
 use std::ops::Range;
 
 /// Colored line between two points.
@@ -1039,6 +1038,31 @@ impl SceneDrawingContext {
  }
  }
 
+ /// Draws an Y+ oriented arrow with the given parameters.
+ pub fn draw_arrow(
+ &mut self,
+ sides: usize,
+ color: Color,
+ length: f32,
+ radius: f32,
+ transform: Matrix4<f32>,
+ ) {
+ self.draw_cylinder(sides, radius, length, true, transform, color);
+
+ let head_radius = radius * 2.0;
+ let head_height = radius * 4.0;
+
+ self.draw_cone(
+ sides,
+ head_radius,
+ head_height,
+ transform
+ * Matrix4::new_translation(&Vector3::new(0.0, (length + head_height) * 0.5, 0.0)),
+ color,
+ true,
+ );
+ }
+
  /// Adds single line into internal buffer.
  pub fn add_line(&mut self, line: Line) {
  self.lines.push(line);