Example usage for com.badlogic.gdx.physics.box2d ChainShape getVertexCount

Introduction

In this page you can find the example usage for com.badlogic.gdx.physics.box2d ChainShape getVertexCount.

Prototype

public int getVertexCount() 

Source Link

Usage

From source file:com.stercore.code.net.dermetfan.utils.libgdx.box2d.Box2DUtils.java

License:Apache License

/** @param shape the Shape which vertices to get (for circles, the bounding box vertices will be returned)
 *  @return the vertices of the given Shape*/
private static Vector2[] vertices0(Shape shape) {
    Vector2[] vertices;/*from  w ww . j a  v  a  2s.co  m*/
    switch (shape.getType()) {
    case Polygon:
        PolygonShape polygonShape = (PolygonShape) shape;
        vertices = new Vector2[polygonShape.getVertexCount()];
        for (int i = 0; i < vertices.length; i++) {
            vertices[i] = new Vector2();
            polygonShape.getVertex(i, vertices[i]);
        }
        break;
    case Edge:
        EdgeShape edgeShape = (EdgeShape) shape;
        edgeShape.getVertex1(vec2_0);
        edgeShape.getVertex2(vec2_1);
        vertices = new Vector2[] { new Vector2(vec2_0), new Vector2(vec2_1) };
        break;
    case Chain:
        ChainShape chainShape = (ChainShape) shape;
        vertices = new Vector2[chainShape.getVertexCount()];
        for (int i = 0; i < vertices.length; i++) {
            vertices[i] = new Vector2();
            chainShape.getVertex(i, vertices[i]);
        }
        break;
    case Circle:
        CircleShape circleShape = (CircleShape) shape;
        Vector2 position = circleShape.getPosition();
        float radius = circleShape.getRadius();
        vertices = new Vector2[4];
        vertices[0] = new Vector2(position.x - radius, position.y + radius); // top left
        vertices[1] = new Vector2(position.x - radius, position.y - radius); // bottom left
        vertices[2] = new Vector2(position.x + radius, position.y - radius); // bottom right
        vertices[3] = new Vector2(position.x + radius, position.y + radius); // top right
        break;
    default:
        throw new IllegalArgumentException(
                "shapes of the type '" + shape.getType().name() + "' are not supported");
    }
    return vertices;
}

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From source file:net.dermetfan.utils.libgdx.box2d.Box2DUtils.java

License:Apache License

/** {@link #vertices(Shape)} without caching */
private static Vector2[] vertices0(Shape shape, Vector2[] output) {
    switch (shape.getType()) {
    case Polygon:
        PolygonShape polygonShape = (PolygonShape) shape;

        if (output == null || output.length != polygonShape.getVertexCount())
            output = new Vector2[polygonShape.getVertexCount()];

        for (int i = 0; i < output.length; i++) {
            if (output[i] == null)
                output[i] = new Vector2();
            polygonShape.getVertex(i, output[i]);
        }/*from  ww  w . j  ava2 s.  c  o m*/
        break;
    case Edge:
        EdgeShape edgeShape = (EdgeShape) shape;

        edgeShape.getVertex1(vec2_0);
        edgeShape.getVertex2(vec2_1);

        if (output == null || output.length != 2)
            output = new Vector2[] { vec2_0, vec2_1 };
        else {
            if (output[0] == null)
                output[0] = new Vector2(vec2_0);
            else
                output[0].set(vec2_0);
            if (output[1] == null)
                output[1] = new Vector2(vec2_1);
            else
                output[1].set(vec2_1);
        }
        break;
    case Chain:
        ChainShape chainShape = (ChainShape) shape;

        if (output == null || output.length != chainShape.getVertexCount())
            output = new Vector2[chainShape.getVertexCount()];

        for (int i = 0; i < output.length; i++) {
            if (output[i] == null)
                output[i] = new Vector2();
            chainShape.getVertex(i, output[i]);
        }
        break;
    case Circle:
        CircleShape circleShape = (CircleShape) shape;

        if (output == null || output.length != 4)
            output = new Vector2[4];
        vec2_0.set(circleShape.getPosition().x - circleShape.getRadius(),
                circleShape.getPosition().y + circleShape.getRadius()); // top left
        output[0] = output[0] != null ? output[0].set(vec2_0) : new Vector2(vec2_0);
        vec2_0.set(circleShape.getPosition().x - circleShape.getRadius(),
                circleShape.getPosition().y - circleShape.getRadius()); // bottom left
        output[1] = output[1] != null ? output[1].set(vec2_0) : new Vector2(vec2_0);
        vec2_0.set(circleShape.getPosition().x + circleShape.getRadius(),
                circleShape.getPosition().y - circleShape.getRadius()); // bottom right
        output[2] = output[2] != null ? output[2].set(vec2_0) : new Vector2(vec2_0);
        vec2_0.set(circleShape.getPosition().x + circleShape.getRadius(),
                circleShape.getPosition().y + circleShape.getRadius()); // top right
        output[3] = output[3] != null ? output[3].set(vec2_0) : new Vector2(vec2_0);
        break;
    default:
        throw new IllegalArgumentException(
                "Shapes of the type '" + shape.getType().name() + "' are not supported");
    }
    return output;
}

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