Android gameLoop使用SurfaceView；快速更换相机“镜头”；导致黑色闪光等
我使用 SurfaceView 构建了一个简单的游戏引擎。
我使用 RectF 作为“相机”窗口，来表示 SurfaceView 画布的缩放像素宽度和高度，并找出屏幕上的内容。
我使用 canvas.translate 移动到相机“指向”的位置。 这是绘制循环：
mCamera.UpdateCamera();
scaleWorld(c, mCamera);
c.translate(-mScreen.left, mScreen.top - miHeight
* (1 / mCamera.getScaleLevel()));
drawBehavior.drawGame(c);
无论如何，如果我发射射弹，游戏就会顺利渲染，并且我看不到黑色的视觉闪烁，这是我用来刷新画布的颜色。
然而，如果我立即改变相机可以看到的内容，也许距离 3 个或更多“屏幕”远，经常会出现黑色闪烁，但并非总是如此。有时我很“幸运”，过渡是无缝的。
这些闪光通常位于我的位图的位置，因为我使用一两个位图递归地绘制地面和背景。
在我看来，突然的变化就是问题所在，所以我试图本质上废弃 gameLoop 线程来停止一切，然后设置新的 Rect 坐标，然后用另一个线程重新启动，但这不起作用。
我想，经过反思，我只是通过这样做来延迟对系统的“冲击”，而不是治疗它。
在尝试通过淡出或其他视觉技巧来掩盖这种可能残暴的设计之前，我想知道是否有人对这个问题有更深入的了解，并且可以引导我找到一个更优雅的解决方案。
I built a simple game engine using SurfaceView.
I use a RectF as a 'camera' window, to represent the scaled pixel width and height of the SurfaceView canvas, and to figure out what is on screen.
I use canvas.translate to move to where the camera is 'pointing' at.
Here is the draw loop:
mCamera.UpdateCamera();
scaleWorld(c, mCamera);
c.translate(-mScreen.left, mScreen.top - miHeight
* (1 / mCamera.getScaleLevel()));
drawBehavior.drawGame(c);
Any way, if I shoot a projectile, the game renders smoothly, and I see no visual flashes of black, which is the color I am using to flush the canvas.
However, if I instantly change what the camera can see, perhaps 3 or more 'screens' away, there is often, but not always, flashes of black. Sometimes I get 'lucky' and the transition is seamless.
These flashes are usually in the positions of my bitmaps, as I draw the ground and background recursively using one or two bitmaps.
It seemed to me that the sudden change was the issue, so I tried to essentially trash the gameLoop thread to stop everything, then set the new Rect coordinates, then restart with another thread, but this does not work.
I suppose on reflection, I was simply delaying the 'shock' to the system by doing this, not treating it.
Before attempting to sweep this perhaps atrocious design under the rug by perhaps a fade out or other visual trick, I am wondering if anyone has a deeper understanding of the issue and could lead me to a more elegant solution.
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（1）
我猜屏幕在抽奖完成之前正在刷新。
多线程仍然让我有点迷失——但这里有一些值得尝试的事情：
尝试在游戏循环开始时锁定画布，并在结束时解锁：
http://developer.android.com/reference/android/view/SurfaceHolder .html#lockCanvas()
I am guessing the screen is refreshing before the draw is complete.
Multi threading still kinda loses me a bit - but here is something to try:
Try locking the canvas at the start of your game loop, and unlock it at the end:
http://developer.android.com/reference/android/view/SurfaceHolder.html#lockCanvas()