我是 LibGDX 的新手。我在 show 方法中创建了带有演员的组并添加了侦听器（我在其中计算旋转矩阵）并希望使用 batch.setTransformMatrix(matrixResult) 旋转组中的所有演员；但什么也没发生。如何强制轮换组的所有演员？
@Override
public void show() {
camera = new PerspectiveCamera(67, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
camera.position.set(0f, 0f, - 120);
camera.lookAt(0,0,0);
camera.near = 0.1f;
camera.far = 300f;
camera.update();
stage = new Stage();
shader = new ShaderProgram(vertexShader, fragmentShader);
myBatch = new SpriteBatch();
shapeRenderer = new ShapeRenderer();
sphere = BuildSphere(5, 100);
group = new Group(){
@Override
public void draw(Batch batch, float parentAlpha) {
batch.setTransformMatrix(matrixResult);
super.draw(batch, parentAlpha);
}
};
group.setTouchable(Touchable.enabled);
group.addListener(new InputListener(){
@Override
public boolean touchDown(InputEvent event, float x, float y,
int pointer, int button) {
Gdx.app.log("MOUSE_X_BEG", Float.toString(x));
Gdx.app.log("MOUSE_Y_BEG", Float.toString(y));
begX = x;
begY = y;
return true;
}
@Override
public void touchDragged(InputEvent event, float x, float y,
int pointer) {
endX = x;
endY = y;
//isRotate = true;
float translationX = endX-begX;
float translationY = begY-endY;
float length = (float)Math.sqrt(Math.pow(translationX,2) + Math.pow(translationY,2));
Vector3 axis = new Vector3(0, 0, 0);
if(length>0){
if(begX-endX == 0){
axis.x = 1;
}else{
float angle = (float) (Math.atan(translationY/translationX) + Math.PI/2.0*(translationX <0 ? -1 : 1));
axis.z = 1;
axis.x = (float) Math.cos(angle);
axis.y = (float) Math.sin(angle);
}
}
quaternion = new Quaternion(axis, 0.02f*length);
Matrix4 rotation = new Matrix4(quaternion);
matrixResult = rotation.mul(matrixRotationOld);
matrixRotationOld = matrixResult;
}
});
//group.setBounds(0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
for (CenterCoordinate cenCoordinate : sphere.getPolygonCenterCoordinates()) {
Vector3 vector = cenCoordinate.getCartesianCenter();
Polygon polygon = new Polygon(1, cenCoordinate.getType().getCode(), cenCoordinate.getRadius(), cenCoordinate.getPsi(),
cenCoordinate.getKsi(), vector, cenCoordinate.getRotation());
group.addActor(polygon);
}
stage.addActor(group);
Gdx.input.setInputProcessor(stage);
}
Polygon 扩展了 Actor 的绘制方法：
@Override
public void draw(Batch batch, float parentAlpha) {
translation.setToTranslation(vertex.x, vertex.y, vertex.z);
matrix.mul(translation);
shader.begin();
shader.setUniformMatrix("u_worldView", matrix);
mesh.render(shader, GL20.GL_LINE_LOOP, 1, mesh.getNumVertices()-1);
shader.end();
matrix.idt();
}