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use std::rc::Rc;
use std::sync::Arc;
use std::cell::RefCell;

use math::*;

use crate::core::geometry::*;
use crate::core::resource::*;
use crate::util::uuid::OsRandNewV4;

#[derive(Debug)]
pub struct FanGeometry
{
	uuid: uuid::Uuid,
	radius_top:f32,
	radius_bottom:f32,
	segments:u32,
	top_length:f32,
	bottom_length:f32,
	vertices:float3s,
	normals:float3s,
	texcoords:float2s,
	indices:Vec<u16>,
}

impl FanGeometry 
{
	pub fn new(top_radius:f32, bottom_radius:f32, segments:u32, top_length:f32, bottom_length:f32) -> Self 
	{
		let mut _vertices = Vec::new();
		let mut _indices = Vec::new();
		let mut _normals = Vec::new();
		let mut _texcoords = Vec::new();

		let top_start = -(f32::pi() + bottom_length) * 0.5;
		let top_segment = top_length / segments as f32;

		let bottom_start = -(f32::pi() + top_length) * 0.5;;
		let bottom_segment = bottom_length / segments as f32;

		for i in 0..segments + 1
		{
			let sin = f32::sin(bottom_start + i as f32 * bottom_segment);
			let cos = f32::cos(bottom_start + i as f32 * bottom_segment);

			let v = float!(bottom_radius * cos, -bottom_radius * sin, 0.0);

			_vertices.push(v);
			_normals.push(float!(0.0,0.0,1.0));
			_texcoords.push(float!(i as f32 / segments as f32, 1.0));
		}

		for i in 0..segments + 1
		{
			let sin = f32::sin(top_start + i as f32 * top_segment);
			let cos = f32::cos(top_start + i as f32 * top_segment);

			let v = float!(top_radius * cos, -top_radius * sin, 0.0);

			_vertices.push(v);
			_normals.push(float!(0.0,0.0,1.0));
			_texcoords.push(float!(i as f32 / segments as f32, 0.0));
		}

		for i in 0..segments
		{
			let v1 = i;
			let v3 = i + 1 + segments;
			let v4 = i + 2 + segments;

			_indices.push(v1 as u16);
			_indices.push(v3 as u16);
			_indices.push(v4 as u16);
		}

		for i in 0..segments
		{
			let v1 = i;
			let v2 = i + 1;
			let v4 = i + 2 + segments;

			_indices.push(v1 as u16);
			_indices.push(v4 as u16);
			_indices.push(v2 as u16);
		}

		Self
		{
			uuid:uuid::Uuid::new_v4_osrng(),
			radius_top:top_radius,
			radius_bottom:bottom_radius,
			segments:segments,
			top_length:top_length,
			bottom_length:bottom_length,
			vertices:_vertices,
			normals:_normals,
			texcoords:_texcoords,
			indices:_indices,
		}
	}

	pub fn new_1(radius_top:f32, radius_bottom:f32, segments:u32) -> Self
	{
		FanGeometry::new(radius_top, radius_bottom, segments, f32::pi(), f32::pi())
	}

	pub fn top_radius(&self) -> f32
	{
		self.radius_top
	}

	pub fn top_length(&self) -> f32
	{
		self.top_length
	}

	pub fn bottom_radius(&self) -> f32
	{
		self.radius_top
	}

	pub fn bottom_length(&self) -> f32
	{
		self.bottom_length
	}

	pub fn segments(&self) -> u32
	{
		self.segments
	}
}

impl Geometry for FanGeometry
{
	fn vertices(&self) -> &[float3]
	{
		&self.vertices[..]
	}

	fn normals(&self) -> &[float3]
	{
		&self.normals[..]
	}

	fn texcoords(&self) -> &[float2]
	{
		&self.texcoords[..]
	}

	fn indices(&self) -> &[u16]
	{
		&self.indices[..]
	}
}

impl Resource for FanGeometry
{
	#[inline]
	fn uuid(&self) -> &uuid::Uuid
	{
		&self.uuid
	}
}

impl From<FanGeometry> for Rc<Geometry + 'static>
{
	fn from(shape:FanGeometry) -> Self
	{
		Rc::new(shape)
	}
}

impl From<FanGeometry> for Arc<Geometry + 'static>
{
	fn from(shape:FanGeometry) -> Self
	{
		Arc::new(shape)
	}
}

impl From<FanGeometry> for Rc<RefCell<Geometry + 'static>>
{
	fn from(shape:FanGeometry) -> Self
	{
		Rc::new(RefCell::new(shape))
	}
}

impl From<FanGeometry> for Arc<RefCell<Geometry + 'static>>
{
	fn from(shape:FanGeometry) -> Self
	{
		Arc::new(RefCell::new(shape))
	}
}