libgdx 3D 瞄准星和隐藏鼠标

1. 瞄准星

 1 /**画瞄准星*/
 2     private void drawSight(){
 3         debugRenderer.begin(ShapeRenderer.ShapeType.Line);
 4         float w = 50;
 5         float h = 40;
 6         Rectangle rect = new Rectangle((Gdx.graphics.getWidth()-w)/2, (Gdx.graphics.getHeight()-h)/2, w, h);
 7         debugRenderer.setColor(new Color(0, 1, 0, 1));
 8         debugRenderer.rect(rect.x, rect.y, rect.width, rect.height);
 9
10         //画十字线
11         debugRenderer.line((Gdx.graphics.getWidth()-2*w)/2,Gdx.graphics.getHeight()/2,(Gdx.graphics.getWidth()+2*w)/2,Gdx.graphics.getHeight()/2);
12         debugRenderer.line(Gdx.graphics.getWidth()/2,(Gdx.graphics.getHeight()-2*h)/2,Gdx.graphics.getWidth()/2,(Gdx.graphics.getHeight()+2*h)/2);
13         debugRenderer.end();
14     }

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

 1 /**隐藏鼠标指针*/
 2     private void hideCursor(){
 3         if (Gdx.app.getType() != Application.ApplicationType.Desktop)
 4             return;
 5         if (emptyCursor == null) {
 6             if (Mouse.isCreated()) {
 7                 int min = org.lwjgl.input.Cursor.getMinCursorSize();
 8                 IntBuffer tmp = BufferUtils.newIntBuffer(min * min);
 9                 try {
10                     emptyCursor = new org.lwjgl.input.Cursor(min, min, min / 2, min / 2, 1, tmp, null);
11                 } catch (LWJGLException e) {
12                     e.printStackTrace();
13                 }
14             } else {
15                 System.out.println("Could not create empty cursor before Mouse object is created");
16             }
17         }
18         if (Mouse.isInsideWindow())
19             try {
20                 Mouse.setNativeCursor(false ? null : emptyCursor);
21             } catch (LWJGLException e) {
22                 e.printStackTrace();
23             }
24     }

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。

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