awayjs-display/lib/prefabs/PrimitiveCylinderPrefab.ts

AwayJS displaylist classes

import IAsset					from "awayjs-core/lib/library/IAsset";

import ElementsType				from "../graphics/ElementsType";
import LineElements				from "../graphics/LineElements";
import ElementsBase				from "../graphics/ElementsBase";
import TriangleElements			from "../graphics/TriangleElements";
import MaterialBase				from "../materials/MaterialBase";
import PrimitivePrefabBase		from "../prefabs/PrimitivePrefabBase";

/**
 * A Cylinder primitive sprite.
 */
class PrimitiveCylinderPrefab extends PrimitivePrefabBase
{
	public _pBottomRadius:number;
	public _pSegmentsW:number;
	public _pSegmentsH:number;

	private _topRadius:number;
	private _height:number;

	private _topClosed:boolean;
	private _bottomClosed:boolean;
	private _surfaceClosed:boolean;
	private _yUp:boolean;
	private _numVertices:number = 0;

	/**
	 * The radius of the top end of the cylinder.
	 */
	public get topRadius():number
	{
		return this._topRadius;
	}

	public set topRadius(value:number)
	{
		this._topRadius = value;
		this._pInvalidatePrimitive();
	}

	/**
	 * The radius of the bottom end of the cylinder.
	 */
	public get bottomRadius():number
	{
		return this._pBottomRadius;
	}

	public set bottomRadius(value:number)
	{
		this._pBottomRadius = value;
		this._pInvalidatePrimitive();
	}

	/**
	 * The radius of the top end of the cylinder.
	 */
	public get height():number
	{
		return this._height;
	}

	public set height(value:number)
	{
		this._height = value;
		this._pInvalidatePrimitive();
	}

	/**
	 * Defines the number of horizontal segments that make up the cylinder. Defaults to 16.
	 */
	public get segmentsW():number
	{
		return this._pSegmentsW;
	}

	public set segmentsW(value:number)
	{
		this.setSegmentsW(value);
	}

	public setSegmentsW(value:number)
	{
		this._pSegmentsW = value;
		this._pInvalidatePrimitive();
		this._pInvalidateUVs();
	}

	/**
	 * Defines the number of vertical segments that make up the cylinder. Defaults to 1.
	 */
	public get segmentsH():number
	{
		return this._pSegmentsH;
	}

	public set segmentsH(value:number)
	{

		this.setSegmentsH(value)

	}

	public setSegmentsH(value:number)
	{
		this._pSegmentsH = value;
		this._pInvalidatePrimitive();
		this._pInvalidateUVs();

	}

	/**
	 * Defines whether the top end of the cylinder is closed (true) or open.
	 */
	public get topClosed():boolean
	{
		return this._topClosed;
	}

	public set topClosed(value:boolean)
	{
		this._topClosed = value;
		this._pInvalidatePrimitive();
	}

	/**
	 * Defines whether the bottom end of the cylinder is closed (true) or open.
	 */
	public get bottomClosed():boolean
	{
		return this._bottomClosed;
	}

	public set bottomClosed(value:boolean)
	{
		this._bottomClosed = value;
		this._pInvalidatePrimitive();
	}

	/**
	 * Defines whether the cylinder poles should lay on the Y-axis (true) or on the Z-axis (false).
	 */
	public get yUp():boolean
	{
		return this._yUp;
	}

	public set yUp(value:boolean)
	{
		this._yUp = value;
		this._pInvalidatePrimitive();
	}

	/**
	 * Creates a new Cylinder object.
	 * @param topRadius The radius of the top end of the cylinder.
	 * @param bottomRadius The radius of the bottom end of the cylinder
	 * @param height The radius of the bottom end of the cylinder
	 * @param segmentsW Defines the number of horizontal segments that make up the cylinder. Defaults to 16.
	 * @param segmentsH Defines the number of vertical segments that make up the cylinder. Defaults to 1.
	 * @param topClosed Defines whether the top end of the cylinder is closed (true) or open.
	 * @param bottomClosed Defines whether the bottom end of the cylinder is closed (true) or open.
	 * @param yUp Defines whether the cone poles should lay on the Y-axis (true) or on the Z-axis (false).
	 */
	constructor(material:MaterialBase = null, elementsType:string = "triangle", topRadius:number = 50, bottomRadius:number = 50, height:number = 100, segmentsW:number = 16, segmentsH:number = 1, topClosed:boolean = true, bottomClosed:boolean = true, surfaceClosed:boolean = true, yUp:boolean = true)
	{
		super(material, elementsType);

		this._topRadius = topRadius;
		this._pBottomRadius = bottomRadius;
		this._height = height;
		this._pSegmentsW = segmentsW;
		this._pSegmentsH = segmentsH;
		this._topClosed = topClosed;
		this._bottomClosed = bottomClosed;
		this._surfaceClosed = surfaceClosed;
		this._yUp = yUp;
	}


	/**
	 * @inheritDoc
	 */
	public _pBuildGraphics(target:ElementsBase, elementsType:string)
	{
		var indices:Uint16Array;
		var positions:ArrayBufferView;
		var normals:Float32Array;
		var tangents:Float32Array;

		var i:number;
		var j:number;
		var x:number;
		var y:number;
		var z:number;
		var vidx:number;
		var fidx:number;

		var radius:number;
		var revolutionAngle:number;

		var dr:number;
		var latNormElev:number;
		var latNormBase:number;
		var numIndices:number = 0;

		var comp1:number;
		var comp2:number;
		var startIndex:number = 0;
		var nextVertexIndex:number = 0;
		var centerVertexIndex:number = 0;

		var t1:number;
		var t2:number;

		// reset utility variables
		this._numVertices = 0;

		// evaluate revolution steps
		var revolutionAngleDelta:number = 2*Math.PI/this._pSegmentsW;

		if (elementsType == ElementsType.TRIANGLE) {

			var triangleGraphics:TriangleElements = <TriangleElements> target;

			// evaluate target number of vertices, triangles and indices
			if (this._surfaceClosed) {
				this._numVertices += (this._pSegmentsH + 1)*(this._pSegmentsW + 1); // segmentsH + 1 because of closure, segmentsW + 1 because of UV unwrapping
				numIndices += this._pSegmentsH*this._pSegmentsW*6; // each level has segmentW quads, each of 2 triangles
			}
			if (this._topClosed) {
				this._numVertices += 2*(this._pSegmentsW + 1); // segmentsW + 1 because of unwrapping
				numIndices += this._pSegmentsW*3; // one triangle for each segment
			}
			if (this._bottomClosed) {
				this._numVertices += 2*(this._pSegmentsW + 1);
				numIndices += this._pSegmentsW*3;
			}

			// need to initialize raw arrays or can be reused?
			if (this._numVertices == triangleGraphics.numVertices) {
				indices = triangleGraphics.indices.get(triangleGraphics.numElements);
				positions = triangleGraphics.positions.get(this._numVertices);
				normals = triangleGraphics.normals.get(this._numVertices);
				tangents = triangleGraphics.tangents.get(this._numVertices);
			} else {
				indices = new Uint16Array(numIndices);
				positions = new Float32Array(this._numVertices*3);
				normals = new Float32Array(this._numVertices*3);
				tangents = new Float32Array(this._numVertices*3);

				this._pInvalidateUVs();
			}

			vidx = 0;
			fidx = 0;

			// top
			if (this._topClosed && this._topRadius > 0) {

				z = -0.5*this._height;

				// central vertex
				if (this._yUp) {
					t1 = 1;
					t2 = 0;
					comp1 = -z;
					comp2 = 0;

				} else {
					t1 = 0;
					t2 = -1;
					comp1 = 0;
					comp2 = z;
				}

				positions[vidx] = 0;
				positions[vidx + 1] = comp1;
				positions[vidx + 2] = comp2;
				normals[vidx] = 0;
				normals[vidx + 1] = t1;
				normals[vidx + 2] = t2;
				tangents[vidx] = 1;
				tangents[vidx + 1] = 0;
				tangents[vidx + 2] = 0;
				vidx += 3;

				nextVertexIndex += 1;

				for (i = 0; i <= this._pSegmentsW; ++i) {

					// revolution vertex
					revolutionAngle = i*revolutionAngleDelta;
					x = this._topRadius*Math.cos(revolutionAngle);
					y = this._topRadius*Math.sin(revolutionAngle);

					if (this._yUp) {
						comp1 = -z;
						comp2 = y;
					} else {
						comp1 = y;
						comp2 = z;
					}

					if (i == this._pSegmentsW) {
						positions[vidx] = positions[startIndex + 3];
						positions[vidx + 1] = positions[startIndex + 4];
						positions[vidx + 2] = positions[startIndex + 5];

					} else {
						positions[vidx] = x;
						positions[vidx + 1] = comp1;
						positions[vidx + 2] = comp2;
					}

					normals[vidx] = 0;
					normals[vidx + 1] = t1;
					normals[vidx + 2] = t2;
					tangents[vidx] = 1;
					tangents[vidx + 1] = 0;
					tangents[vidx + 2] = 0;
					vidx += 3;

					if (i > 0) {
						// add triangle
						indices[fidx++] = nextVertexIndex - 1;
						indices[fidx++] = centerVertexIndex;
						indices[fidx++] = nextVertexIndex;
					}

					nextVertexIndex += 1;
				}
			}

			// bottom
			if (this._bottomClosed && this._pBottomRadius > 0) {

				z = 0.5*this._height;

				startIndex = nextVertexIndex*3;

				centerVertexIndex = nextVertexIndex;

				// central vertex
				if (this._yUp) {
					t1 = -1;
					t2 = 0;
					comp1 = -z;
					comp2 = 0;
				} else {
					t1 = 0;
					t2 = 1;
					comp1 = 0;
					comp2 = z;
				}

				if (i > 0) {
					positions[vidx] = 0;
					positions[vidx + 1] = comp1;
					positions[vidx + 2] = comp2;
					normals[vidx] = 0;
					normals[vidx + 1] = t1;
					normals[vidx + 2] = t2;
					tangents[vidx] = 1;
					tangents[vidx + 1] = 0;
					tangents[vidx + 2] = 0;
					vidx += 3;
				}

				nextVertexIndex += 1;

				for (i = 0; i <= this._pSegmentsW; ++i) {

					// revolution vertex
					revolutionAngle = i*revolutionAngleDelta;
					x = this._pBottomRadius*Math.cos(revolutionAngle);
					y = this._pBottomRadius*Math.sin(revolutionAngle);

					if (this._yUp) {
						comp1 = -z;
						comp2 = y;
					} else {
						comp1 = y;
						comp2 = z;
					}

					if (i == this._pSegmentsW) {
						positions[vidx] = positions[startIndex + 3];
						positions[vidx + 1] = positions[startIndex + 4];
						positions[vidx + 2] = positions[startIndex + 5];
					} else {
						positions[vidx] = x;
						positions[vidx + 1] = comp1;
						positions[vidx + 2] = comp2;
					}

					normals[vidx] = 0;
					normals[vidx + 1] = t1;
					normals[vidx + 2] = t2;
					tangents[vidx] = 1;
					tangents[vidx + 1] = 0;
					tangents[vidx + 2] = 0;
					vidx += 3;

					if (i > 0) {
						// add triangle
						indices[fidx++] = nextVertexIndex - 1;
						indices[fidx++] = nextVertexIndex;
						indices[fidx++] = centerVertexIndex;
					}

					nextVertexIndex += 1;
				}
			}

			// The normals on the lateral surface all have the same incline, i.e.
			// the "elevation" component (Y or Z depending on yUp) is constant.
			// Same principle goes for the "base" of these vectors, which will be
			// calculated such that a vector [base,elev] will be a unit vector.
			dr = (this._pBottomRadius - this._topRadius);
			latNormElev = dr/this._height;
			latNormBase = (latNormElev == 0)? 1 : this._height/dr;

			// lateral surface
			if (this._surfaceClosed) {
				var a:number;
				var b:number;
				var c:number;
				var d:number;
				var na0:number, na1:number, naComp1:number, naComp2:number;

				for (j = 0; j <= this._pSegmentsH; ++j) {
					radius = this._topRadius - ((j/this._pSegmentsH)*(this._topRadius - this._pBottomRadius));
					z = -(this._height/2) + (j/this._pSegmentsH*this._height);

					startIndex = nextVertexIndex*3;

					for (i = 0; i <= this._pSegmentsW; ++i) {
						// revolution vertex
						revolutionAngle = i*revolutionAngleDelta;
						x = radius*Math.cos(revolutionAngle);
						y = radius*Math.sin(revolutionAngle);
						na0 = latNormBase*Math.cos(revolutionAngle);
						na1 = latNormBase*Math.sin(revolutionAngle);

						if (this._yUp) {
							t1 = 0;
							t2 = -na0;
							comp1 = -z;
							comp2 = y;
							naComp1 = latNormElev;
							naComp2 = na1;

						} else {
							t1 = -na0;
							t2 = 0;
							comp1 = y;
							comp2 = z;
							naComp1 = na1;
							naComp2 = latNormElev;
						}

						if (i == this._pSegmentsW) {
							positions[vidx] = positions[startIndex];
							positions[vidx + 1] = positions[startIndex + 1];
							positions[vidx + 2] = positions[startIndex + 2];
							normals[vidx] = na0;
							normals[vidx + 1] = latNormElev;
							normals[vidx + 2] = na1;
							tangents[vidx] = na1;
							tangents[vidx + 1] = t1;
							tangents[vidx + 2] = t2;
						} else {
							positions[vidx] = x;
							positions[vidx + 1] = comp1;
							positions[vidx + 2] = comp2;
							normals[vidx] = na0;
							normals[vidx + 1] = naComp1;
							normals[vidx + 2] = naComp2;
							tangents[vidx] = -na1;
							tangents[vidx + 1] = t1;
							tangents[vidx + 2] = t2;
						}
						vidx += 3;

						// close triangle
						if (i > 0 && j > 0) {
							a = nextVertexIndex; // current
							b = nextVertexIndex - 1; // previous
							c = b - this._pSegmentsW - 1; // previous of last level
							d = a - this._pSegmentsW - 1; // current of last level

							indices[fidx++] = a;
							indices[fidx++] = b;
							indices[fidx++] = c;

							indices[fidx++] = a;
							indices[fidx++] = c;
							indices[fidx++] = d;
						}

						nextVertexIndex++;
					}
				}
			}

			// build real data from raw data
			triangleGraphics.setIndices(indices);

			triangleGraphics.setPositions(positions);
			triangleGraphics.setNormals(normals);
			triangleGraphics.setTangents(tangents);

		} else if (elementsType == ElementsType.LINE) {
			var lineGraphics:LineElements = <LineElements> target;

			var numSegments:number = this._pSegmentsH*this._pSegmentsW*2 + this._pSegmentsW;
			positions = new Float32Array(numSegments*6);
			var thickness:Float32Array = new Float32Array(numSegments);

			vidx = 0;

			fidx = 0;
			var _radius = 50;
			for (j = 0; j <= this._pSegmentsH; ++j) {

				radius = this._topRadius - ((j/this._pSegmentsH)*(this._topRadius - this._pBottomRadius));
				z = -(this._height/2) + (j/this._pSegmentsH*this._height);

				for (i = 0; i <= this._pSegmentsW; ++i) {
					// revolution vertex
					revolutionAngle = i*revolutionAngleDelta;
					x = radius*Math.cos(revolutionAngle);
					y = radius*Math.sin(revolutionAngle);

					if (this._yUp) {
						comp1 = -z;
						comp2 = y;
					} else {
						comp1 = y;
						comp2 = z;
					}

					if (i > 0) {
						//horizonal lines
						positions[vidx++] = x;
						positions[vidx++] = comp1;
						positions[vidx++] = comp2;

						thickness[fidx++] = 1;

						//vertical lines
						if (j > 0) {
							var addx:number = (j == 1)? 3 - (6*(this._pSegmentsW-i) + 12*i) : 3 - this._pSegmentsW*12;
							positions[vidx] = positions[vidx++ + addx];
							positions[vidx] = positions[vidx++ + addx];
							positions[vidx] = positions[vidx++ + addx];

							positions[vidx++] = x;
							positions[vidx++] = comp1;
							positions[vidx++] = comp2;

							thickness[fidx++] = 1;
						}

					}

					//horizonal lines
					if (i < this._pSegmentsW) {
						positions[vidx++] = x;
						positions[vidx++] = comp1;
						positions[vidx++] = comp2;
					}
				}
			}

			// build real data from raw data
			lineGraphics.setPositions(positions);
			lineGraphics.setThickness(thickness);
		}
	}

	/**
	 * @inheritDoc
	 */
	public _pBuildUVs(target:ElementsBase, elementsType:string)
	{
		var i:number;
		var j:number;
		var x:number;
		var y:number;
		var revolutionAngle:number;
		var uvs:ArrayBufferView;

		if (elementsType == ElementsType.TRIANGLE) {

			var triangleGraphics:TriangleElements = <TriangleElements> target;

			// need to initialize raw array or can be reused?
			if (triangleGraphics.uvs && this._numVertices == triangleGraphics.numVertices) {
				uvs = triangleGraphics.uvs.get(this._numVertices);
			} else {
				uvs = new Float32Array(this._numVertices*2);
			}

			// evaluate revolution steps
			var revolutionAngleDelta:number = 2*Math.PI/this._pSegmentsW;

			// current uv component index
			var index:number = 0;

			// top
			if (this._topClosed) {

				uvs[index++] = 0.5*this._scaleU; // central vertex
				uvs[index++] = 0.5*this._scaleV;

				for (i = 0; i <= this._pSegmentsW; ++i) {

					revolutionAngle = i*revolutionAngleDelta;
					x = 0.5 + 0.5* -Math.cos(revolutionAngle);
					y = 0.5 + 0.5*Math.sin(revolutionAngle);

					uvs[index++] = x*this._scaleU; // revolution vertex
					uvs[index++] = y*this._scaleV;
				}
			}

			// bottom
			if (this._bottomClosed) {

				uvs[index++] = 0.5*this._scaleU; // central vertex
				uvs[index++] = 0.5*this._scaleV;

				for (i = 0; i <= this._pSegmentsW; ++i) {

					revolutionAngle = i*revolutionAngleDelta;
					x = 0.5 + 0.5*Math.cos(revolutionAngle);
					y = 0.5 + 0.5*Math.sin(revolutionAngle);

					uvs[index++] = x*this._scaleU; // revolution vertex
					uvs[index++] = y*this._scaleV;
				}
			}

			// lateral surface
			if (this._surfaceClosed) {
				for (j = 0; j <= this._pSegmentsH; ++j) {
					for (i = 0; i <= this._pSegmentsW; ++i) {
						// revolution vertex
						uvs[index++] = ( i/this._pSegmentsW )*this._scaleU;
						uvs[index++] = ( j/this._pSegmentsH )*this._scaleV;
					}
				}
			}

			// build real data from raw data
			triangleGraphics.setUVs(uvs);

		} else if (elementsType == ElementsType.LINE) {
			//nothing to do here
		}
	}
}

export default PrimitiveCylinderPrefab;