/**
* Creates and applies the fixtures defined in the editor. The name parameter is used to retrieve
* the right fixture from the loaded file. <br>
* <br>
* The body reference point (the red cross in the tool) is by default located at the bottom left
* corner of the image. This reference point will be put right over the BodyDef position point.
* Therefore, you should place this reference point carefully to let you place your body in your
* world easily with its BodyDef.position point. Note that to draw an image at the position of
* your body, you will need to know this reference point (see {@link #getOrigin(java.lang.String,
* float)}. <br>
* <br>
* Also, saved shapes are normalized. As shown in the tool, the width of the image is considered
* to be always 1 meter. Thus, you need to provide a scale factor so the polygons get resized
* according to your needs (not every body is 1 meter large in your game, I guess).
*
* @param body The Box2d body you want to attach the fixture to.
* @param name The name of the fixture you want to load.
* @param def The fixture parameters to apply to the created body fixture.
* @param scale The desired scale of the body. The default width is 1.
*/
public void attachFixture(Body body, String name, FixtureDef def, float scale) {
RigidBodyModel rbModel = this.MODEL.RIGIDBODIES.get(name);
if (rbModel == null) throw new RuntimeException("Name '" + name + "' was not found.");
Vector2 origin = this.VEC.set(rbModel.ORIGIN).scl(scale);
for (int i = 0, n = rbModel.POLYGONS.size(); i < n; i++) {
PolygonModel polygon = rbModel.POLYGONS.get(i);
Vector2[] vertices = polygon.buffer;
for (int j = 0, n2 = vertices.length; j < n2; j++) {
vertices[j] = newVec().set(polygon.VERTICES.get(j)).scl(scale);
vertices[j].sub(origin);
}
this.POLYGONSHAPE.set(vertices);
def.shape = this.POLYGONSHAPE;
body.createFixture(def);
for (int j = 0, n2 = vertices.length; j < n2; j++) {
free(vertices[j]);
}
}
for (int i = 0, n = rbModel.CIRCLES.size(); i < n; i++) {
CircleModel circle = rbModel.CIRCLES.get(i);
Vector2 center = newVec().set(circle.CENTER).scl(scale);
float radius = circle.radius * scale;
this.CIRCLESHAPE.setPosition(center);
this.CIRCLESHAPE.setRadius(radius);
def.shape = this.CIRCLESHAPE;
body.createFixture(def);
free(center);
}
}
private RigidBodyModel readRigidBody(JsonValue bodyElem) {
RigidBodyModel rbModel = new RigidBodyModel();
rbModel.name = bodyElem.getString("name");
rbModel.imagePath = bodyElem.getString("imagePath");
JsonValue originElem = bodyElem.get("origin");
rbModel.ORIGIN.x = originElem.getFloat("x");
rbModel.ORIGIN.y = originElem.getFloat("y");
// polygons
JsonValue polygonsElem = bodyElem.getChild("polygons");
for (; polygonsElem != null; polygonsElem = polygonsElem.next()) {
PolygonModel polygon = new PolygonModel();
rbModel.POLYGONS.add(polygon);
JsonValue vertexElem = polygonsElem.child();
for (; vertexElem != null; vertexElem = vertexElem.next()) {
float x = vertexElem.getFloat("x");
float y = vertexElem.getFloat("y");
polygon.VERTICES.add(new Vector2(x, y));
}
polygon.buffer = new Vector2[polygon.VERTICES.size()];
}
// circles
JsonValue circleElem = bodyElem.getChild("circles");
for (; circleElem != null; circleElem = circleElem.next()) {
CircleModel circle = new CircleModel();
rbModel.CIRCLES.add(circle);
circle.CENTER.x = circleElem.getFloat("cx");
circle.CENTER.y = circleElem.getFloat("cy");
circle.radius = circleElem.getFloat("r");
}
return rbModel;
}