libgdx 3D 瞄准星和隐藏鼠标

1. 瞄准星

/**画瞄准星*/
    private void drawSight(){
        debugRenderer.begin(ShapeRenderer.ShapeType.Line);
        float w = 50;
        float h = 40;
        Rectangle rect = new Rectangle((Gdx.graphics.getWidth()-w)/2, (Gdx.graphics.getHeight()-h)/2, w, h);
        debugRenderer.setColor(new Color(0, 1, 0, 1));
        debugRenderer.rect(rect.x, rect.y, rect.width, rect.height);

        //画十字线
        debugRenderer.line((Gdx.graphics.getWidth()-2*w)/2,Gdx.graphics.getHeight()/2,(Gdx.graphics.getWidth()+2*w)/2,Gdx.graphics.getHeight()/2);
        debugRenderer.line(Gdx.graphics.getWidth()/2,(Gdx.graphics.getHeight()-2*h)/2,Gdx.graphics.getWidth()/2,(Gdx.graphics.getHeight()+2*h)/2);
        debugRenderer.end();
    }

debugRenderer = new ShapeRenderer();
debugRenderer.setProjectionMatrix(stage.getCamera().combined);

其中stage是ui用的，比如显示个FPS之类的，或者其他用户界面

效果图：

2. 隐藏鼠标指针

/**隐藏鼠标指针*/
    private void hideCursor(){
        if (Gdx.app.getType() != Application.ApplicationType.Desktop)
            return;
        if (emptyCursor == null) {
            if (Mouse.isCreated()) {
                int min = org.lwjgl.input.Cursor.getMinCursorSize();
                IntBuffer tmp = BufferUtils.newIntBuffer(min * min);
                try {
                    emptyCursor = new org.lwjgl.input.Cursor(min, min, min / 2, min / 2, 1, tmp, null);
                } catch (LWJGLException e) {
                    e.printStackTrace();
                }
            } else {
                System.out.println("Could not create empty cursor before Mouse object is created");
            }
        }
        if (Mouse.isInsideWindow())
            try {
                Mouse.setNativeCursor(false ? null : emptyCursor);
            } catch (LWJGLException e) {
                e.printStackTrace();
            }
    }

private org.lwjgl.input.Cursor emptyCursor;

我抄来的，详情见：https://gist.github.com/mattdesl/4255483 

//TODO 准星在调整窗口大小后有问题。