/*******************************************************************************
* Copyright 2011 See AUTHORS file.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
package com.badlogic.gdx.graphics.g3d.utils.shapebuilders;
import com.badlogic.gdx.graphics.g3d.utils.MeshPartBuilder;
import com.badlogic.gdx.graphics.g3d.utils.MeshPartBuilder.VertexInfo;
import com.badlogic.gdx.math.MathUtils;
/** Helper class with static methods to build cone shapes using {@link MeshPartBuilder}.
* @author xoppa */
public class ConeShapeBuilder extends BaseShapeBuilder {
public static void build (MeshPartBuilder builder, float width, float height, float depth, int divisions) {
build(builder, width, height, depth, divisions, 0, 360);
}
public static void build (MeshPartBuilder builder, float width, float height, float depth, int divisions, float angleFrom,
float angleTo) {
build(builder, width, height, depth, divisions, angleFrom, angleTo, true);
}
public static void build (MeshPartBuilder builder, float width, float height, float depth, int divisions, float angleFrom,
float angleTo, boolean close) {
// FIXME create better cylinder method (- axis on which to create the cone (matrix?))
builder.ensureVertices(divisions + 2);
builder.ensureTriangleIndices(divisions);
final float hw = width * 0.5f;
final float hh = height * 0.5f;
final float hd = depth * 0.5f;
final float ao = MathUtils.degreesToRadians * angleFrom;
final float step = (MathUtils.degreesToRadians * (angleTo - angleFrom)) / divisions;
final float us = 1f / divisions;
float u = 0f;
float angle = 0f;
VertexInfo curr1 = vertTmp3.set(null, null, null, null);
curr1.hasUV = curr1.hasPosition = curr1.hasNormal = true;
VertexInfo curr2 = vertTmp4.set(null, null, null, null).setPos(0, hh, 0).setNor(0, 1, 0).setUV(0.5f, 0);
final short base = builder.vertex(curr2);
short i1, i2 = 0;
for (int i = 0; i <= divisions; i++) {
angle = ao + step * i;
u = 1f - us * i;
curr1.position.set(MathUtils.cos(angle) * hw, 0f, MathUtils.sin(angle) * hd);
curr1.normal.set(curr1.position).nor();
curr1.position.y = -hh;
curr1.uv.set(u, 1);
i1 = builder.vertex(curr1);
if (i != 0) builder.triangle(base, i1, i2); // FIXME don't duplicate lines and points
i2 = i1;
}
if (close)
EllipseShapeBuilder.build(builder, width, depth, 0, 0, divisions, 0, -hh, 0, 0, -1, 0, -1, 0, 0, 0, 0, 1,
180f - angleTo, 180f - angleFrom);
}
}