你有一个关于 box2D 和 libgdx 关于逻辑和渲染概念的非常有用的链接。这里
然后你可以像这样分离渲染部分的逻辑部分:
逻辑部分:
private void createBottleBody() {
// 0. Create a loader for the file saved from the editor.
BodyEditorLoader loader = new BodyEditorLoader(sourceFile);
// 1. Create a BodyDef, as usual.
BodyDef bd = new BodyDef();
bd.position.set(0, 0);
bd.type = BodyType.DynamicBody;
// 2. Create a FixtureDef, as usual.
FixtureDef fd = new FixtureDef();
fd.density = 1;
fd.friction = 0.5f;
fd.restitution = 0.3f;
// 3. Create a Body, as usual.
bottleModel = world.createBody(bd);
// 4. Create the body fixture automatically by using the loader.
loader.attachFixture(bottleModel, "test01", fd, BOTTLE_WIDTH);
}
渲染部分:
public void render() {
Vector2 bottlePos = bottleModel.getPosition().sub(bottleModelOrigin);
bottleSprite.setPosition(bottlePos.x, bottlePos.y);
bottleSprite.setOrigin(bottleModelOrigin.x, bottleModelOrigin.y);
bottleSprite.setRotation(bottleModel.getAngle() * MathUtils.radiansToDegrees);
...
}
加载器:在链接中,您可以找到加载器。
public void attachFixture(Body body, String name, FixtureDef fd, float scale) {
//Load the rigidModel by key
RigidBodyModel rbModel = (RigidBodyModel) this.model.rigidBodies.get(name);
if (rbModel == null)
throw new RuntimeException("Name '" + name + "' was not found.");
//Loading polygons
Vector2 origin = this.vec.set(rbModel.origin).mul(scale);
Vector2[] vertexes;
PolygonModel polygon;
for (int i = rbModel.polygons.size()-1; 0 <= i; i--) {
polygon = (PolygonModel) rbModel.polygons.get(i);
vertexes = polygon.vectorBuffer;
//Loading vertexes (scaled) from polygon
for (int ii = vertexes.length-1; 0 <= ii; ii--) {
vertexes[ii] = new Vector2().set((Vector2) polygon.vertices.get(ii)).mul(scale);
vertexes[ii].sub(origin);
}
//sets vertexs to polygon
this.polygonShape.set(vertexes);
fd.shape = this.polygonShape;
body.createFixture(fd);
}
//Loading circles
CircleModel circle;
Vector2 center;
float radius;
for (int i = rbModel.circles.size()-1; 0 <= i; i--) {
circle = (CircleModel) rbModel.circles.get(i);
center = new Vector2().set(circle.center).mul(scale);
radius = circle.radius * scale;
this.circleShape.setPosition(center);
this.circleShape.setRadius(radius);
fd.shape = this.circleShape;
body.createFixture(fd);
}
}
最后...模型
public static class CircleModel {
public final Vector2 center = new Vector2();
public float radius;
}
public static class PolygonModel {
public final List<Vector2> vertices = new ArrayList<Vector2>();
private Vector2[] vectorBuffer;
}
public static class RigidBodyModel {
public String name;
public String imagePath;
public final Vector2 origin = new Vector2();
public final List<PolygonModel> polygons = new ArrayList<PolygonModel>();
public final List<CircleModel> circles = new ArrayList<CircleModel>();
}
public static class Model {
public final Map<String, RigidBodyModel> rigidBodies = new HashMap<String, RigidBodyModel>();
}
希望能帮助到你!