com.badlogic.gdx.physics.box2d.PolygonShape.java Source code

Introduction

Here is the source code for com.badlogic.gdx.physics.box2d.PolygonShape.java

Source

/*******************************************************************************
 * 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.physics.box2d;

import org.jbox2d.common.Vec2;

import com.badlogic.gdx.math.Vector2;

public class PolygonShape extends Shape {
    org.jbox2d.collision.shapes.PolygonShape shape;

    /** Constructs a new polygon */
    public PolygonShape() {
        super(new org.jbox2d.collision.shapes.PolygonShape());
        shape = (org.jbox2d.collision.shapes.PolygonShape) super.shape;
    }

    public PolygonShape(org.jbox2d.collision.shapes.PolygonShape shape) {
        super(shape);
        this.shape = shape;
    }

    /** {@inheritDoc} */
    @Override
    public Type getType() {
        return Type.Polygon;
    }

    /** Copy vertices. This assumes the vertices define a convex polygon. It is assumed that the exterior is the the right of each
     * edge. */
    public void set(Vector2[] vertices) {
        Vec2[] v = new org.jbox2d.common.Vec2[vertices.length];
        for (int i = 0; i < v.length; i++) {
            v[i] = new Vec2(vertices[i].x, vertices[i].y);
        }
        shape.set(v, v.length);
    }

    /** Copy vertices from the given float array. It is assumed the vertices are in x,y order and define a convex polygon. It is
     * assumed that the exterior is the the right of each edge. */
    public void set(float[] vertices) {
        set(vertices, 0, vertices.length);
    }

    /** Copy vertices from the given float array, taking into account the offset and length. It is assumed the vertices are in x,y
     * order and define a convex polygon. It is assumed that the exterior is the the right of each edge. */
    public void set(float[] vertices, int offset, int len) {
        Vec2[] v = new org.jbox2d.common.Vec2[len / 2];
        for (int i = 0; i < v.length; i++) {
            v[i] = new Vec2(vertices[i * 2], vertices[i * 2 + 1]);
        }
        shape.set(v, v.length);
    }

    /** Build vertices to represent an axis-aligned box.
     * @param hx the half-width.
     * @param hy the half-height. */
    public void setAsBox(float hx, float hy) {
        shape.setAsBox(hx, hy);
    }

    final Vec2 tmp = new Vec2();

    /** Build vertices to represent an oriented box.
     * @param hx the half-width.
     * @param hy the half-height.
     * @param center the center of the box in local coordinates.
     * @param angle the rotation in radians of the box in local coordinates. */
    public void setAsBox(float hx, float hy, Vector2 center, float angle) {
        tmp.set(center.x, center.y);
        shape.setAsBox(hx, hy, tmp, angle);
    }

    /** @return the number of vertices */
    public int getVertexCount() {
        return shape.m_count;
    }

    @Override
    public float getRadius() {
        return shape.getRadius();
    }

    @Override
    public void setRadius(float radius) {
        shape.setRadius(radius);
    }

    @Override
    public int getChildCount() {
        return shape.getChildCount();
    }

    /** Returns the vertex at the given position.
     * @param index the index of the vertex 0 <= index < getVertexCount( )
     * @param vertex vertex */
    public void getVertex(int index, Vector2 vertex) {
        Vec2 v = shape.m_vertices[index];
        vertex.set(v.x, v.y);
    }
}